Socket Head Screws

Socket Head Cap Screws

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Standard / drawing type Nominal size d

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Equivalent standards

Standard	Standard body

		Steel	Stainless steel	Non-ferrous metals
General technical requirements		GB/T 16938
Thread	Tolerances	Property class 12.9: 5g6g; Other property classes: 6g
Thread	Standard	GB/T 196, GB/T 197
Mechanical properties	Class	d < 3 mm: by agreement; 3 mm ≤ d ≤ 39 mm: property classes 8.8, 10.9 and 12.9; d > 39 mm: by agreement	d≤24mm:A2-70a, A4-70, A5-70, A3-70; 24mm<d≤39mm:A2-50b, A4-50, A5-50, A3-50; d > 39 mm: by agreement	CU2, CU3
Mechanical properties	Standard	GB/T 3098.1	GB/T 3098.6	GB/T 3098.10
Tolerances	Product grade	A
Tolerances	Standard	GB/T 3103.1
Surface treatment		Oxide coating; Electroplating requirements in accordance with GB/T 5267.1; Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2	Simple treatment	Simple treatment; Electroplating requirements in accordance with GB/T 5267.1
Surface discontinuities		Property class 12.9: GB/T 5779.3; Other property classes: GB/T 5779.1
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2
		a A1-70 may be used for stainless steel screws machined from bar (d ≤ M12), provided the property class is marked on the screw. b A1-50 may be used for stainless steel screws machined from bar, provided the property class is marked on the screw.

		Steel	Stainless steel	Non-ferrous metals
General technical requirements		GB/T 16938
Thread	Tolerances	Property class 12.9 :5g6g; Other property classes: 6g
Thread	Standard	GB/T 196, GB/T 197
Mechanical properties	Class	d < 3 mm: by agreement; 3 mm ≤ d ≤ 39 mm: property classes 8.8, 10.9 and 12.9; d > 39 mm: by agreement	d≤24mm:A2-70a, A4-70, A5-70, A3-70; 24mm<d≤39mm:A2-50b, A4-50, A5-50, A3-50; d > 39 mm: by agreement	CU2, CU3
Mechanical properties	Standard	GB/T 3098.1	GB/T 3098.6	GB/T 3098.10
Tolerances	Product grade	A
Tolerances	Standard	GB/T 3103.1
Surface treatment		Oxide coating; Electroplating requirements in accordance with GB/T 5267.1; Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2	Simple treatment	Simple treatment; Electroplating requirements in accordance with GB/T 5267.1
Surface discontinuities		Property class 12.9: GB/T 5779.3; Other property classes: GB/T 5779.1
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2
a A1-70 may be used for stainless steel screws machined from bar (d ≤ M12), provided the property class is marked on the screw. b A1-50 may be used for stainless steel screws machined from bar, provided the property class is marked on the screw.

Socket head cap screws have a cylindrical head with an internal hexagonal drive. Confirm the head dimensions and thread coverage for your assembly.

Provide the diameter, pitch, nominal length, required standard, property class, finish and quantity.