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Cap Head O-Ring Seal Screws

SKU: SF01 Categories: ,

Cap Head O-Ring Seal Screws are an ideal choice for applications where there is risk of contamination from external matter. They feature a strong, unique, and high quality captive “O” ring which sits in a groove on the underside of the cap head.

This provides 360° of sealant power while maintaining metal to metal contact, which is essential in preventing contaminants from entering the seal or screw. Equally, it stops any leaks from escaping due to its incredibly tight seal. This offers greatly improved performance over a long period of time.

Cap Head O-Ring Seal Screws arrive pre-assembled and ready to use. Available with either a Socket drive, typically to DIN 912 standard / ISO 4762 / ASME B18.3, or a 6 Lobe TX drive, typically to ISO 14579. They are installed using a standard Allen key or 6 Lobe Torx tool respectively.

The O-ring is made of Silicone rubber as standard, but can be supplied in an extensive range of materials – making them suitable for use in almost any environment without deterioration or loss of performance. This includes Nitrile rubber (Buna-N), EPDM, Fluorosilicone, Viton, and many more.

They are often found in valves, electronic devices, panels, food processing equipment, and consumer products – as well as more demanding applications that require high sealing power.

This truly versatile sealing solution is extremely cost effective due to its long lifespan. Optional thread locking patches are also available to provide additional resistance to vibration – further increasing the life of the O-ring.

Cap Head O-Ring Seal Screws are tailor made to meet your requirements – manufactured to order in a wide range of sizes, materials and finishes. Minimum order quantities apply.

We supply a selection of Sealing Fasteners here at Fastenright, including a range of seal screws with various head styles and drive types.

Cap Head O-Ring Seal Screws Technical Drawing

M10 to M30

M1.4 to M8 Technical Data & Availability
Thread
Diameter (d)
M1.4 M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8
dk max. (mm) 2.6 3 3.8 4.5 5.5 6 7 8.5 10 13
k max. (mm) 1.4 1.6 2 2.5 3 3.5 4 5 6 8
b (mm) 14 15 16 17 18 20 20 22 24 28
Available
Lengths (L)
M1.4 M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8
2mm black icon imagered icon image
3mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
4mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
5mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
6mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
8mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
10mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
12mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
14mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
16mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
18mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
20mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
22mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
25mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
30mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
35mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
40mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
45mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
50mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
55mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
60mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
65mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
70mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
75mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
80mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
85mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
90mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
95mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
100mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
110mm black icon imagered icon image black icon imagered icon image black icon imagered icon image
120mm black icon imagered icon image black icon imagered icon image black icon imagered icon image
130mm black icon imagered icon image black icon imagered icon image black icon imagered icon image
140mm black icon imagered icon image black icon imagered icon image black icon imagered icon image
150mm black icon imagered icon image black icon imagered icon image
160mm black icon imagered icon image black icon imagered icon image
170mm black icon imagered icon image black icon imagered icon image
180mm black icon imagered icon image black icon imagered icon image
190mm black icon imagered icon image black icon imagered icon image
200mm black icon imagered icon image black icon imagered icon image
210mm red icon image black icon imagered icon image
220mm red icon image black icon imagered icon image
230mm black icon imagered icon image
240mm black icon imagered icon image
250mm black icon imagered icon image
260mm black icon imagered icon image
270mm black icon imagered icon image
280mm black icon imagered icon image
290mm black icon imagered icon image
300mm black icon imagered icon image
black icon image = A2 / 304 Stainless Steel // red icon image = A4 / 316 Stainless Steel
Size not listed? Please make an enquiry – we may be able to provide it.

No.0 to No.12

M10 to M30 Technical Data & Availability
Thread
Diameter (d)
M10 M12 M14 M16 M18 M20 M22 M24 M27 M30
dk max. (mm) 16 18 21 24 27 30 33 36 40 45
k max. (mm) 10 12 14 16 18 20 22 24 27 30
b (mm) 32 36 40 44 48 52 56 60 66 72
Available
Lengths (L)
M10 M12 M14 M16 M18 M20 M22 M24 M27 M30
12mm black icon imagered icon image
14mm black icon imagered icon image
16mm black icon imagered icon image black icon imagered icon image
18mm black icon imagered icon image black icon imagered icon image
20mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
22mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
25mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
30mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
35mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
40mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
45mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
50mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
55mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
60mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
65mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
70mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
75mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
80mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
85mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
90mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
95mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
100mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
110mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
120mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
130mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
140mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
150mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
160mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
170mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
180mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
190mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
200mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
210mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
220mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
230mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
240mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
250mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
260mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
270mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
280mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
290mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
300mm black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image
black icon image = A2 / 304 Stainless Steel // red icon image = A4 / 316 Stainless Steel
Size not listed? Please make an enquiry – we may be able to provide it.

1/4″ to 1″

ASME B18.3 UNC / UNF Technical Data & Availability
Thread
Diam.
(d)
0-80
UNF
1-64
UNC
1-72
UNF
2-56
UNC
2-64
UNF
3-48
UNC
3-56
UNF
4-40
UNC
4-48
UNF
5-40
UNC
6-32
UNC
6-40
UNF
8-32
UNC
8-36
UNF
10-24
UNC
10-32
UNF
12-24
UNC
dk max
(in)
0.096 0.118 0.118 0.140 0.140 0.161 0.161 0.183 0.183 0.205 0.226 0.226 0.270 0.270 0.312 0.312 0.343
k max
(in)
0.060 0.073 0.073 0.086 0.086 0.099 0.099 0.112 0.112 0.125 0.138 0.138 0.164 0.164 0.190 0.190 0.216
b max
(in)
0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 1 1.05 1.05 1.19 1.19 1.27 1.27 1.27
Avail.
Lengths
(L)
0-80
UNF
1-64
UNC
1-72
UNF
2-56
UNC
2-64
UNF
3-48
UNC
3-56
UNF
4-40
UNC
4-48
UNF
5-40
UNC
6-32
UNC
6-40
UNF
8-32
UNC
8-36
UNF
10-24
UNC
10-32
UNC
12-24
UNC
3/32″ black icon image
1/8″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image
5/32″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image
3/16″ black icon image black icon image black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image
7/32″ black icon image black icon image black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image
1/4″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image
5/16″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image
3/8″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
7/16″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
1/2″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
9/16″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
5/8″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
3/4″ black icon image black icon image black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
7/8″ black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
1″ black icon image black icon image black icon image black icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon image
1 1/8″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image
1 1/4″ black icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image
1 3/8″ black icon image black icon image black icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image
1 1/2″ black icon image black icon image black icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image
1 3/4″ black icon image black icon image black icon image black icon imagered icon image black icon imagered icon image
2″ black icon image black icon image black icon image black icon imagered icon image black icon imagered icon image
2 1/4″ black icon image black icon image black icon image black icon image
2 1/2″ black icon image black icon image black icon image black icon image
2 3/4″ black icon image black icon image black icon image black icon image
3″ black icon image black icon image black icon image black icon image
3 1/4″ black icon image black icon image black icon image
3 1/2″ black icon image black icon image black icon image
3 3/4″ black icon image black icon image black icon image
4″ black icon image black icon image black icon image
5″ black icon image black icon image
6″ black icon image black icon image
8″
black icon image = A2 / 304 Stainless Steel // red icon image = A4 / 316 Stainless Steel
Size not listed? Please make an enquiry – we may be able to provide it.

 

ASME B18.3 UNC / UNF Technical Data & Availability
Thread
Diam.
(d)
1/4-20
UNC
1/4-28
UNF
5/16-18
UNC
5/16-24
UNF
3/8-16
UNC
3/8-24
UNF
7/16-14
UNC
7/16-20
UNF
1/2-13
UNC
1/2-20
UNF
5/8-11
UNC
5/8-18
UNC
3/4-10
UNC
3/4-16
UNF
7/8-9
UNC
1″-8
UNC
dk max
(in)
0.375 0.375 0.469 0.469 0.562 0.562 0.656 0.656 0.75 0.75 0.938 0.938 1.125 1.125 1.312 1.5
k max
(in)
0.25 0.25 0.312 0.312 0.375 0.375 0.438 0.438 0.5 0.5 0.625 0.625 0.75 0.75 0.875 1
b max
(in)
1.5 1.5 1.71 1.71 1.94 1.94 2.17 2.17 2.38 2.38 2.82 2.82 3.25 3.25 3.69 1
Avail.
Lengths
(L)
1/4-20
UNC
1/4-28
UNF
5/16-18
UNC
5/16-24
UNF
3/8-16
UNC
3/8-24
UNF
7/16-14
UNC
7/16-20
UNF
1/2-13
UNC
1/2-20
UNF
5/8-11
UNC
5/8-18
UNC
3/4-10
UNC
3/4-16
UNF
7/8-9
UNC
1″-8
UNC
1/4″ black icon image black icon image black icon image black icon image
5/16″ black icon image black icon image black icon image black icon image
3/8″ black icon imagered icon image black icon image black icon image black icon image black icon image
7/16″ black icon imagered icon image black icon image black icon image black icon image black icon image
1/2″ black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image black icon image black icon image
9/16″ black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image black icon image black icon image
5/8″ black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image black icon image black icon image
3/4″ black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image black icon imagered icon image black icon image
7/8″ black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image
1″ black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon imagered icon image black icon image black icon image black icon imagered icon image black icon image black icon imagered icon image black icon image black icon image
1 1/8″ black icon imagered icon image black icon imagered icon image black icon image