CAP(Kyokuto Seisakusho(Coarse Steel Trivalent white(Silver) 4 X 20 Pitch 0.7

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This is a bolt with a cylindrical head featuring a hexagonal socket.
A hex key (Allen wrench) is used for tightening. Although classified as a bolt, it is most often used without a nut.
It is also known as a cap screw or socket screw. Box spanners and wrenches used to tighten hex bolts require clearance space around the work area, whereas a hex key requires no such space.
Therefore, the use of hex socket head cap screws enables work in confined spaces and allows for more compact machine design.
Their appearance has also led to increasing use in decorative applications.

• Hex socket head cap screw Kadomaru Coarse pitch
• Nominal diameter (d) M4
• Length under head (ℓ) 20.0
• Pitch (P) 0.7
• Thread length (b) Reference 20
• Head diameter (dk) Nominal 7 Tolerance ±0.22
• Neck diameter (da) Max 4.7
• Body diameter (ds) Nominal 4 Tolerance 0,-0.18
• Head height (k) Nominal 4 Tolerance 0,-0.18
• Under-head fillet (r) Min 0.2
• Hex socket width across flats (S) Nominal 3 Tolerance +0.080,+0.020
• Hex socket depth (t) Min 2
• Full thread range 25