Hex socket head cap screw(Fine Stainless steel Unplated 10X30(P1.25 Pitch 1.5

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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) M10
• Length under head (ℓ) 30.0
• Pitch 1.25
• Thread length (b)* Reference 32
• Head diameter (dk) Max (Nominal) 16.00 Max 16.27 Min 15.73
• Body diameter (ds) Max 10.00 Min 9.78
• Hex socket width across corners (e) Min 9.149
• Head height (k) Max 10.00 Min 9.64
• Hex socket width across flats (s) Nominal 8
• Hex socket depth (t) Min 5
• Under-socket head height (w) Min 4
• *Stainless steel type will be full thread.