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High-Strength Hex Flange Bolts

Supply: Stock supply and custom manufacturing
Materials: 35CrMo / 42CrMo / stainless steel / alloy steel
Property classes: 8.8 / 10.9 / 12.9
Finishes: Black oxide / zinc plating / Dacromet / plain
Size range: M5–M20

Enlarged flange heads provide a larger bearing area and can eliminate the need for a separate flat washer. Used in automotive chassis, engine assemblies, structural steel and machinery.

GB/T 5787 Dimensions — Enlarged Series

Nominal standard sizes; product grade B as specified on the original product page.

Thread size (d)	Width across flats (s)	Flange diameter (dc), max.	Head height (k), max.	Typical length range (L)
M5	8 mm	11.8 mm	5.4 mm	10 - 50 mm
M6	10 mm	14.2 mm	6.6 mm	12 - 60 mm
M8	13 mm	18.0 mm	8.1 mm	16 - 80 mm
M10	15 mm	22.3 mm	9.2 mm	20 - 100 mm
M12	16 mm	26.6 mm	11.5 mm	25 - 120 mm
M14	18 mm	30.5 mm	12.8 mm	30 - 140 mm
M16	21 mm	35.0 mm	14.4 mm	30 - 150 mm
M20	27 mm	43.0 mm	17.1 mm	40 - 200 mm

GB/T 5789 Dimensions — Reduced-Shank, Enlarged Series

Thread size (d)	Width across flats (s)	Flange diameter (dc), max.	Head height (k), max.	Typical length range (L)
M5	8 mm	11.8 mm	5.4 mm	12 - 50 mm
M6	10 mm	14.2 mm	6.6 mm	12 - 60 mm
M8	13 mm	18.0 mm	8.1 mm	16 - 80 mm
M10	16 mm	22.3 mm	9.2 mm	20 - 100 mm
M12	18 mm	26.6 mm	11.5 mm	25 - 120 mm
M14	21 mm	30.5 mm	12.8 mm	30 - 140 mm
M16	24 mm	35.0 mm	14.4 mm	35 - 150 mm
M20	30 mm	43.0 mm	17.1 mm	45 - 200 mm

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