Hex socket head cap screw(Nissan Neji(Coarse Steel Unplated 20 X 70 Pitch 2.5

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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 commonly used without a nut.
It is also known as a cap screw or socket screw.
Jaw spanners and wrenches used to tighten hex bolts require clearance space around the work area, whereas a hex key requires no such space.
For this reason, 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 decorative applications.
Cap Bolt　

• Hex socket head cap screw Nissan Neji Coarse pitch
• Nominal diameter (d) M20
• Length under head (l) 70.0
• Pitch (P) 2.5
• Thread length (b) Reference 52
• Head diameter (dk) Max(1) Nominal 30 Max(2) 30.33 Min 29.67
• Neck diameter (da) Max 22.4
• Body diameter (ds) Max Nominal 20.00 Min 19.67
• Head height (k) Max Nominal 20.00 Min 19.48
• Neck fillet (r) Min 0.8
• Hex socket width across flats (s) Nominal 17.0 Max 17.23 Min 17.05
• Hex socket depth (t) Min 10
• Head chamfer (v) Max 2.0
• *(1) Applies to heads without knurling.
• (2) Applies to heads with knurling.