Hex socket head cap screw(Coarse Steel Unplated 24 X 80(P=3.0 Pitch 3.0

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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): M24
• Length under head (ℓ): 80.0
• Pitch (P): 3
• Thread length (b): Reference 60
• Head diameter (dk): Max(1) Nominal 36 Max(2) 36.39 Min 35.61
• Neck diameter (da): Max 26.4
• Body diameter (ds): Max Nominal 24 Min 23.67
• Hex socket width across corners (e): Min 21.734
• Head height (k): Max Nominal 24 Min 23.48
• Neck fillet (r): Min 0.8
• Hex socket width across flats (s): Nominal Basic dimension 19 Max 19.275 Min 19.065
• Hex socket depth (t): Min 12
• Head chamfer (v): Max 2.4
• *Max(1) Without knurling maximum diameter / Max(2) With knurling maximum diameter