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GOST 7796 (-3):1970 Type 3 Hex Head Drilled Head Bolt

GOST 7796 (-3):1970 Type 3 Hex Head Drilled Head Bolt adds a drilled hole to the hex head, enabling safety wiring, identification marking, or special assembly control. It is useful where the fastening condition needs to be visible and manageable.

This product can be used in machinery, engineering vehicles, frequently serviced equipment, and joints requiring additional locking measures. The hex head keeps good tool compatibility, while the drilled head provides a convenient point for safety wire, seals, or process labels.

Hole orientation, head size, thread size, and surface protection should be considered during selection. For vibration, impact, or safety-related positions, it is best used together with a suitable anti-loosening method and regular inspection process.

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PREV：JIS B 1180 (AT2.1):2004 Small Hex Head Bolt NEXT：BS 1768:1963 Inch Series Hex Head Drilled Shank Bolt

Dimensions unit: mm

 

Thread size d 8 10 12 -14 16 -18 20 -22 24 -27 30 36 42 48
P Pitch Coarse Teeth 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 3 3.5 4 4.5 5
Fine Teeth 1 1.25 1.25 1.5 1.5 1.5 1.5 1.5 2 2 2 3 3 3
ds 8 10 12 14 16 18 20 22 24 27 30 36 42 48
s 12 14 17 19 22 24 27 30 32 36 41 50 60 70
k 5.3 6.4 7.5 8.8 10 12 12.5 14 15 17 18.7 22.5 26 30
e Min. 13.1 15.3 18.7 20.9 23.9 26.2 29.6 33 35 39.6 45.2 55.4 66.4 76.9
dw Min. 10.5 12.5 15.5 17.2 20.1 22 24.8 27.7 29.5 33.2 38 46.6 55.9 64.7
c Min. 0.15 0.15 0.15 0.15 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.25 0.25
Max. 0.6 0.6 0.6 0.6 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
d4 Min.=Nominal  2.5 2.5 3.2 3.2 4 4 4 4 4 4 4 5 5 5
Max. 2.9 2.9 3.68 3.68 4.48 4.48 4.48 4.48 4.48 4.48 4.48 5.48 5.48 5.48
L2 Nominal 2.8 3.5 4 4.5 5 6 6.5 7 7.5 8.5 9.5 11.5 13 15
Min. 2.6 3.26 3.76 4.26 4.76 5.76 6.21 6.71 7.21 8.21 9.21 11.15 12.65 14.65
Max. 3 3.74 4.24 4.74 5.24 6.24 6.79 7.29 7.79 8.79 9.79 11.85 13.35 15.35

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Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010.

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Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time delivery

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