10.9 Hex bolt Full thread Fine Steel Unplated 12X35(1.25 Pitch 1.75

Bolts with a strength class of 10.9, marked with "10.9" on the head.
These bolts have a regular hexagonal head and are tightened using a wrench or spanner.
They can be tightened more securely than slotted or cross recessed screws.
●Full thread = A bolt where the entire length under the head is threaded. (Generally for lengths of 30mm or less)
●Partial thread (hex bolt) = A bolt that is only threaded from the tip partway up the shank.
Partial thread length calculation (approximate guide)
L = up to 129     Nominal thread diameter × 2 + 6
L = 130 to 219   Nominal thread diameter × 2 + 12
L = 220 and up   Nominal thread diameter × 2 + 25
Example: For an M10×250 partial thread bolt, since L (length) is 220 or greater, the threaded portion is 10×2+25 = 45mm.
Thread Pitch & Hex Width Across Flats Reference Chart　Hex Bolt Encyclopedia

• 10.9 Hex bolt Full thread Fine
• Nominal diameter (d) M12
• Length under head (ℓ) 35.0
• Pitch (p) 1.25
• Head height (k) Nominal 8 Tolerance ±0.3
• Width across flats (s) Nominal 19 Tolerance 0,-0.8
• Width across corners (e) Approx. 21.9