Hex socket head cap screw(Nissan Neji(Coarse Steel Unplated 14 X 60 Pitch 2.0

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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): M14
• Length under head (ℓ): 60.0
• Pitch (P): 2.0
• Thread length (b): Reference 40
• Head diameter (dk): Max(1) Nominal 21 Max(2) 21.33 Min 20.67
• Neck diameter (da): Max 15.7
• Body diameter (ds): Max Nominal 14.00 Min 13.73
• Head height (k): Max Nominal 14.00 Min 14.57
• Neck fillet (r): Min 0.6
• Hex socket width across flats (s): Nominal 12.0 Max 12.212 Min 12.032
• Hex socket depth (t): Min 7
• Head chamfer (v): Max 1.4
• *(1) Applies to heads without knurling.
• (2) Applies to heads with knurling.