Hex socket head cap screw(TKS(Tokosha(Coarse Steel Trivalent white(Silver) 4 X 8 Pitch 0.7

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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) M4
• Length under head (l) 8.0
• Pitch (P) 0.7
• Head diameter (dk) Max(1) Nominal 7.0 Max(2) 7.22 Min 6.78
• Neck diameter (da) Max 4.7
• Body diameter (ds) Max Nominal 4 Min 3.82
• Head height (k) Max Nominal 4 Min 3.82
• Neck fillet (r) Min 0.2
• Hex socket width across flats (s) Nominal 3 Max 3.08 Min 3.02
• Hex socket depth (t) Min 2
• Head chamfer (v) Max 0.4
• l dimension full thread range 28
• *Max(1) Maximum diameter without knurling Max(2) Maximum diameter with knurling