Hex socket head cap screw(Coarse Steel Nickel(Silver) 12 X 30(P=1.75 Pitch 1.75

Please contact us if you need to verify the thread section

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) M12
• Length under head (ℓ) 30.0
• Pitch (P) 1.75
• Thread length (b) Reference 36
• Head diameter (dk) Max(1) Nominal 18 Max(2) 18.27 Min 17.73
• Neck diameter (da) Max 13.7
• Body diameter (ds) Max Nominal 12 Min 11.73
• Hex socket width across corners (e) Min 11.429
• Head height (k) Max Nominal 12 Min 11.57
• Neck fillet (r) Min 0.6
• Hex socket width across flats (s) Nominal Basic dimension 10 Max 10.175 Min 10.025
• Hex socket depth (t) Min 6
• Head chamfer (v) Max 1.2
• ※Max(1) Without knurling: maximum diameter / Max(2) With knurling: maximum diameter