Hex socket head cap screw(Nihon Fastener Kogyo(Coarse Steel Zinc plated(Silver) 3 X 30 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 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) M3
• Length under head (l) 30.0
• Pitch (P) 0.5
• Thread length (b) Reference 18
• Head diameter (dk) Max Nominal 5.5 Max 5.68 Min 5.32
• Neck diameter (da) Max 3.60
• 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