Hex socket head cap screw(TKS(Tokosha(Coarse Steel Trivalent black(Black) 8 X 25 Pitch 1.25

For thread section inquiries, please contact us.

This is a bolt with a cylindrical head featuring a hexagonal socket.
Tightening is performed using a hex key (Allen wrench). Although classified as a bolt, it is most commonly used without a mating nut.
It is also known as a cap screw or socket screw.
Spanners and wrenches with jaws used to tighten hex bolts require clearance space around the work area, whereas a hex key requires no such clearance.
As a result, the use of hex socket head cap screws enables work in confined spaces and contributes to the miniaturization of machinery.
Their appearance has also led to increasing use in design-oriented applications.

• Hex socket head cap screw TKS Tokosha Coarse pitch
• Nominal diameter (d) M8
• Length under head (ℓ) 25.0
• Pitch (P) 1.25
• Head diameter (dk) Max(1) Nominal 13 Max(2) 13.27 Min 12.73
• Neck diameter (da) Max 9.2
• Body diameter (ds) Max Nominal 8 Min 7.78
• Head height (k) Max Nominal 8 Min 7.64
• Neck fillet (r) Min 0.4
• Hex socket width across flats (s) Nominal 6 Max 6.14 Min 6.02
• Hex socket depth (t) Min 4
• Head chamfer (v) Max 0.8
• ℓ dimension full thread range 35
• *Max(1) Maximum diameter without knurling Max(2) Maximum diameter with knurling