Hex socket head cap screw(TKS(Tokosha(Coarse Steel Trivalent black(Black) 3 X 8 Pitch 0.5

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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) M3
• Length under head (ℓ) 8.0
• Pitch (P) 0.5
• Head diameter (dk) Max(1) Nominal 5.5 Max(2) 5.68 Min 5.32
• Neck diameter (da) Max 3.6
• Body diameter (ds) Max Nominal 3 Min 2.86
• Head height (k) Max Nominal 3 Min 2.86
• Neck fillet (r) Min 0.1
• Hex socket width across flats (s) Nominal 2.5 Max 2.58 Min 2.52
• Hex socket depth (t) Min 1.3
• Head chamfer (v) Max 0.3
• ℓ dimension full thread range 22
• *Max(1) Maximum diameter without knurling Max(2) Maximum diameter with knurling