Hex Head O-Ring Seal Bolts

Hex Head O-Ring Seal Bolts provide a complete, cost-effective sealing fastener with 360° protection against liquids, gases, and other potentially harmful contaminants.

These components operate the same as normal hex head bolts – installed using a standard spanner or wrench. They are equipped with a strong and sturdy Silicone rubber O-ring which is situated within a groove on the underside of the hexagon shaped head.

The ultra-tight seal is specifically designed to prevent contaminants from entering and prevent matter from escaping. As a result, Hex Head O-Ring Seal Bolts are often used in military and medical applications, high-pressure environments, and those with strict sealing requirements.

This O-ring does not prevent metal to metal contact which ensures a strong and secure fixing. It can be supplied in an extensive range of materials to best suit the intended application or assembly e.g. Nitrile rubber (Buna-N), Viton, Fluorosilicone, EPDM, and many more.

Hex Head O-Ring Seal Bolts and Slotted Hex Head O-Ring Seal Bolts are available to order at Fastenright. Both components can be supplied as a fully threaded set screw, typically to DIN 933 / DIN 933SZ / ISO 4017 / ASME B18.6.3, or as a partially threaded bolt, typically to DIN 931 / ISO 4014 / ASME B18.2.1.

Optional thread locking patches can also be provided to increase vibration resistance and preserve the operational life of the O-ring.

Hex Head O-Ring Seal Bolts 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 screws, bolts, nuts, rivets and security fasteners.

M20 to M52

3mm

4mm

5mm

6mm

8mm

10mm

12mm

14mm

16mm

18mm

20mm

22mm

25mm

30mm

35mm

40mm

45mm

50mm

55mm

60mm

65mm

70mm

75mm

80mm

85mm

90mm

95mm

100mm

110mm

120mm

130mm

140mm

150mm

160mm

*

*

170mm

*

*

180mm

*

*

190mm

*

*

200mm

*

*

210mm

*

*

*

*

220mm

*

*

*

*

230mm

*

*

*

*

240mm

*

*

*

*

250mm

*

*

*

*

260mm

*

*

*

*

270mm

*

*

*

*

280mm

*

*

*

*

290mm

*

*

*

*

300mm

*

*

*

*

320mm

*

*

*

340mm

*

*

*

360mm

*

*

*

380mm

*

*

*

400mm

*

*

*

420mm

*

*

*

440mm

*

*

*

460mm

*

*

*

480mm

*

*

*

500mm

*

*

*

520mm

*

*

*

540mm

*

*

*

560mm

*

*

*

580mm

*

*

*

600mm

*

*

*

= A2 / 304 Stainless Steel //  = A4 / 316 Stainless Steel Parts with * are available for DIN 931 only. Size not listed? Please contact us – we may be able to provide it.

ASME B18.2.1 1/4″ to 1/2″

20mm

22mm

25mm

30mm

35mm

40mm

45mm

50mm

55mm

60mm

65mm

70mm

75mm

80mm

85mm

90mm

95mm

100mm

*

*

110mm

*

*

*

120mm

*

*

*

*

130mm

*

*

*

*

*

140mm

*

*

*

*

*

150mm

*

*

*

*

*

160mm

*

*

*

*

*

*

170mm

*

*

*

*

*

*

180mm

*

*

*

*

*

*

190mm

*

*

*

*

*

*

200mm

*

*

*

*

*

*

210mm

*

*

*

*

*

*

*

*

*

*

*

220mm

*

*

*

*

*

*

*

*

*

*

*

230mm

*

*

*

*

*

*

*

*

*

*

*

240mm

*

*

*

*

*

*

*

*

*

*

*

250mm

*

*

*

*

*

*

*

*

*

*

*

260mm

*

*

*

*

*

*

*

*

*

270mm

*

*

*

*

*

*

*

*

*

280mm

*

*

*

*

*

*

*

*

*

290mm

*

*

*

*

*

*

*

*

*

300mm

*

*

*

*

*

*

*

*

*

320mm

*

*

340mm

*

*

360mm

*

*

380mm

*

*

400mm

*

*

420mm

*

*

440mm

*

*

460mm

*

*

480mm

*

*

500mm

*

*

520mm

*

*

540mm

*

*

560mm

*

*

580mm

*

*

600mm

*

*

= A2 / 304 Stainless Steel // = A4 / 316 Stainless Steel Parts with * are available for DIN 931 only. Size not listed? Please contact us – we may be able to provide it.

ASME B18.2.1 9/16″ to 1″

1 1/4″
1 3/8″
1 1/2″
1 5/8″
1 3/4″
2″
2 1/4″
2 1/2″
2 3/4″
3″
3 1/4″
3 1/2″
3 3/4″
4″
4 1/2″
5″
5 1/2″
6″
7″
8″
9″
10″
11″
12″
14″
16″
18″
20″

= A2 / 304 Stainless Steel // = A4 / 316 Stainless Steel Size not listed? Please contact us – we may be able to provide it.

ASME B18.6.3 No.4 to 7/16″

2″
2 1/4″
2 1/2″
2 3/4″
3″
3 1/4″
3 1/2″
3 3/4″
4″
4 1/2″
5″
5 1/2″
6″
7″
8″
9″
10″
11″
12″
14″
16″
18″
20″

= A2 / 304 Stainless Steel // = A4 / 316 Stainless Steel Size not listed? Please contact us – we may be able to provide it.

ASME B18.6.3 7/16″ to 1″

1/4″

5/16″

3/8″

7/16″

1/2″

9/16″

5/8″

3/4″

7/8″

1″

1 1/4″

1 1/2″

1 3/4″

2″

2 1/4″

2 1/2″

2 3/4″

3″

3 1/4″

3 1/2″

3 3/4″

4″

4 1/2″

5″

5 1/2″

6″

7″

8″

9″