Hex socket head cap screw(Coarse Steel Unplated 16 X 120(P=2.0 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 for tightening hex bolts require clearance space around the work area, whereas a hex key requires no such space.
For this reason, hex socket head cap screws enable work in confined spaces and allow for more compact machine designs.
Their appearance has also led to increasing use in decorative applications.


Cap Bolts　
Representative Standard Dimensions for CAP Screws　
Hex Socket Head Cap Screws　

• Hex socket head cap screw (Coarse pitch)
• Nominal diameter (d) M16
• Length under head (ℓ) 120.0
• Pitch (P) 2
• Thread length (b) Reference 44
• Head diameter (dk) Max(1) Nominal 24 Max(2) 24.33 Min 23.67
• Neck diameter (da) Max 17.7
• Body diameter (ds) Max Nominal 16 Min 15.73
• Hex socket width across corners (e) Min 15.996
• Head height (k) Max Nominal 16 Min 15.57
• Neck fillet (r) Min 0.6
• Hex socket width across flats (s) Nominal Nominal 14 Max 14.212 Min 14.032
• Hex socket depth (t) Min 8
• Head chamfer (v) Max 1.6
• *Max(1) Without knurling: maximum diameter / Max(2) With knurling: maximum diameter