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East of Chaiao Village, Linmingguan Town, Yongnian District, Handan City, Hebei Province, China
DIN7991 Socket countersunk screw
Thread Size: M3-M24
Surface Treatment: Galvanized(White/Yellow), Hot Dip Galvanized, Black Oxide, Dacromet, Black Zinc Plating, Plain, Electrophoresis(Black)
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Product Size
DIN7991
Size a (1) b (3) d k d s S min t +2°-0 min max min max nom. max M3 90° 12 一 一 5.7 6 2.86 3 2 0.95 1.2 M4 14 一 一 7.64 8 3.82 4 2.5 1.55 1.8 M5 16 一 一 9.64 10 4.82 5 3 2.05 2.3 M6 18 24 一 11.57 12 5.82 6 4 2.25 2.5 M8 22 28 一 15.57 16 7.78 8 5 3.2 3.5 M10 26 32 45 19.48 20 9.78 10 6 4.1 4.4 M12 30 36 49 23.48 24 11.73 12 8 4.3 4.6 (M14) 34 40 53 26.48 27 13.73 14 10 4.5 4.8 M16 38 44 57 29.48 30 15.73 16 10 5 5.3 (M18) 42 48 61 32.38 33 17.73 18 12 5.2 5.5 M20 46 52 65 35.38 36 19.67 20 12 5.6 5.9 (M22) 60° 50 56 69 35.38 36 21.67 22 14 8.44 8.8 M24 54 60 73 38.38 39 23.67 24 14 9.87 10.3 (1) For L≤125mm
(2) For 125<L≤200mm
(3) For L>200mm
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DIN7991 countersunk head hexagon socket bolts, also called flat cup hexagon socket screws, are made to German DIN standards. With a countersunk conical head and a hexagon socket groove on top, they are flush with the workpiece surface after installation without protrusion. The shank has uniform and smooth threads. Widely used in machinery, molds, electronics, home appliances, suitable for assemblies requiring flat appearance. Common materials: SUS304, SUS316 stainless steel and carbon steel; strength grades: 4.8, 8.8; coatings: galvanized, black oxide, dacromet, customizable with high cost performance.
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East of Chaiao Village, Linmingguan Town, Yongnian District, Handan City, Hebei Province