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Captive Reduced Thread Hexagon Bolt

Captive Reduced Thread Hexagon Bolt are often used to secure panels – they can only be partially removed, designed to remain in the panel when loosened.

They host an unthreaded portion below the head, often referred to as a reduced thread, helping to prevent any loss of fasteners. Often required by EU Law in certain pieces of safety-critical equipment such as safety guards, conforming to the EU Machine Safety Directive 2006.

Captive Reduced Thread Hexagon Bolt are regularly found in industrial machinery and military applications which must be undertaken quickly, efficiently and securely.

Thread locking patches can be installed onto these Captive Hexagon Bolts, also available at Fastenright.

Manufactured as standard in A2 Stainless Steel and A4 Stainless Steel, with specialised materials such as Titanium available upon request.

Available in thread diameters from M2 to M12 as standard, with a huge range of lengths up to 300mm.

Non-standard sizes, materials and finishes are available to order as specials, including small volume manufacture, modifications and custom parts made to drawings.

Captive Hexagon Bolts

d1 and L1 dimensions can be to customer specification.

Technical Data & Available Sizes
Thread Diameter M2 M2.5 M3 M4 M5 M6 M8 M10 M12
DK (mm) 4 5 5.5 5.7* 7 7.6* 8 9.5* 10 10.5* 13 14* 17 19
d1 (mm) 1.4 1.8 2.2 3 3.8 4.5 6.2 8 9.5
L1 (mm) 4 5 6 4* 8 5* 10 6* 12 8* 16 10* 20 24
H (mm) 1.6 2 2.1 1.65* 2.9 2.2* 3.6 2.75* 4.1 3.3* 5.4 4.4* 6.6 7.7
Available Sizes (L) M2 M2.5 M3 M4 M5 M6 M8 M10 M12
8mm black icon image black icon image*
10mm black icon image black icon image black icon image* black icon image*
12mm black icon image black icon image black icon image black icon image* black icon image* black icon image*
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16mm black icon image black icon image black icon image black icon image black icon image* black icon image* black icon image*
18mm black icon image black icon image black icon image black icon image
20mm black icon image black icon image black icon image black icon image black icon image black icon image* black icon image*
22mm black icon image black icon image black icon image
25mm black icon image black icon image black icon image black icon image black icon image*
30mm black icon image black icon image black icon image black icon image black icon image*
35mm black icon image black icon image black icon image black icon image black icon image black icon image
40mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
45mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
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55mm black icon image black icon image black icon image black icon image black icon image black icon image
60mm black icon image black icon image black icon image black icon image black icon image black icon image
65mm black icon image black icon image black icon image black icon image black icon image black icon image
70mm black icon image black icon image black icon image black icon image black icon image black icon image
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100mm black icon image black icon image black icon image black icon image black icon image
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290mm black icon image black icon image
300mm black icon image black icon image
black icon image = Available
Parts with * host different dimensions.
Size not listed? Please contact us – we may be able to provide it.
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