7markHex bolt(Small(Full thread(Coarse Steel Trivalent white(Silver) 8 X 30 Pitch 1.25

S45C bolts with a strength class of 8.8T, marked with the number 7 or 8 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 applicable for lengths of 30mm or less)
●Partial thread (medium bolt) = A bolt that is only threaded from the tip partway up the shank.
Partial thread length calculation method (approximate guide)
L = up to 129     nominal thread diameter × 2 + 6
L = 130 to 219   nominal thread diameter × 2 + 12
L = 220 and above   nominal thread diameter × 2 + 25
Example: For an M10×250 partial thread bolt, since L (length) is 220 or more, the threaded portion = 10×2+25 = 45mm.
Thread Pitch & Hex Width Across Flats Reference Chart　Hex Bolt Encyclopedia

• 7 Mark hex bolt, small, full thread, coarse pitch
• Nominal diameter: M8
• Length under head (ℓ): 30.0
• Width across flats x height (BxH): 12x5.5
• Pitch: 1.25