10.9 Hex bolt(Coarse Steel Unplated 20X80X46 Pitch 2.5

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Depending on the diameter size, lengths equal to or greater than the following will be partial thread.
5 X 25 and above / 6 X 30 and above / 8 X 30 and above / 10 X 35 and above / 12 X 40 and above / 14 X 45 and above / 16 X 45 and above / 18 X 55 and above / 20 X 55 and above / 22 X 60 and above / 24 X 65 and above / 27 X 70 and above / 30 X 75 and above / 33 X 75 and above / 36 X 90 and above / 39 X 95 and above / 42 X 95 and above
Diameters 45 and 48 are essentially partial thread as standard.
Generally, a bolt refers to a screw used together with a nut. Among these, the representative hex bolt has a regular hexagonal head and is tightened using a wrench or spanner. It can be tightened more firmly than slotted or cross recessed screws.
●Full thread = A bolt where the entire length below the head is threaded. (Lengths of 30mm or less are a general guideline.)
●Partial thread (intermediate bolt) = A bolt that is threaded only from the tip partway up the shank.
Partial thread length calculation method (approximate guideline)
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 M10×250 partial thread, since L (length) is 220 or greater, the thread length = 10×2+25 = 45mm.
Thread Pitch & Hex Width Across Flats Reference Chart　Hex Bolt Encyclopedia

• 10.9 Hex bolt Coarse pitch
• Nominal diameter (d) M20
• Length under head (ℓ) 80.0
• Coarse pitch 2.5
• Body diameter (ds) Basic dimension 20 Tolerance 0,-0.35
• Head height (k) Nominal 13 Tolerance ±0.35
• Width across flats (s) Nominal 30 Tolerance 0,-0.8
• Width across corners (e) Approx. 34.6
• End chamfer (z) Approx. 2.5