Hex socket head cap screw(Nihon Fastener Kogyo(Coarse Steel Trivalent white(Silver) 16 X 35 Pitch 2.0

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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 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 does not.
Therefore, 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.
Cap Bolt

• Hex socket head cap screw Nihon Fastener Kogyo Coarse pitch
• Nominal diameter (d) M16
• Length under head (ℓ) 35.0
• Pitch (P) 2.0
• Thread length (b) Reference 44
• Head diameter (dk) Max Nominal 24 Max 24.33 Min 23.67
• Neck diameter (da) Max 17.7
• Body diameter (ds) Max Nominal 16 Min 15.73
• Head height (k) Max Nominal 16 Min 15.57
• Neck fillet (r) Min 0.6
• Hex socket width across flats (S) Nominal 14.0 Max 14.212 Min 14.032
• Hex socket depth (t) Min 8
• Head chamfer (v) Max 1.6