Hex socket head cap screw(HSK(Hikari Seiko(Coarse Stainless steel Unplated 10 X 40 Pitch 1.5

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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 mating nut.
It is also known as a cap screw or socket screw.
Spanners and wrenches with jaws that tighten hex bolts require clearance space around the work area, whereas a hex key requires no such clearance.
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 also increasingly being used for decorative purposes.

• Hex socket head cap screw HSK Hikari Seiko Coarse pitch
• Nominal diameter (d) M10
• Length under head (ℓ) 40.0
• Pitch (P) 1.5
• Thread length (b) Reference 32
• Head outer diameter (dk) 16
• Head height (k) 10
• Hex socket width across flats (s) 8
• Hex socket depth (t) 5 or more
• Full thread range 40