Hex socket head cap screw(Fine Steel Unplated 24X40(P-2.0 Pitch 3.0

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This is a bolt with a hexagonal socket in a cylindrical head.
A hex key (Allen wrench) is used for tightening. Although classified as a bolt, it is in most cases used without a nut.
It is also known as a cap screw or socket screw. Open-end spanners and wrenches used to tighten hex bolts require working space around them, 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.
Due to their appearance, they are increasingly being used for decorative purposes as well.
Cap Bolts　

• Hex socket head cap screw Fine pitch
• Nominal diameter (d) M24
• Length under head (ℓ) 40.0
• Pitch 2.0
• Thread length (b)* Reference 60
• Head diameter (dk) Max (Nominal) 36.00 Max 36.39 Min 35.61
• Body diameter (ds) Max 24.00 Min 23.67
• Hex socket width across corners (e) Min 21.734
• Head height (k) Max 24.00 Min 23.48
• Hex socket width across flats (s) Nominal 19
• Hex socket depth (t) Min 12
• Under-socket head height (w) Min 10.4
• *Stainless steel versions have full thread.