Hexagon Head Bolts

Hexagon Head Bolts with Wire Holes

GB/T 32.1-2020 (reference only)

Nominal size d

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GB/T 32.1-2020 dimension drawing

Dimensions in mm

Standard	Standard body

		Steel	Stainless steel	Non-ferrous metals
General technical requirements		GB/T 16938
Thread	Tolerances	6g
Thread	Standard	GB/T 193, GB/T 9145
Mechanical properties	Class	6 mm ≤ d ≤ 39 mm: property classes 5.6, 8.8 and 10.9; d > 39 mm: by agreement	d≤24mm:A2-70, A4-70; 24mm<d≤39mm:A2-50, A4-50; d > 39 mm: by agreement	CU2, CU3, AL4
Mechanical properties	Standard	6mm≤d≤39mm:GB/T 3098.1; d > 39 mm: by agreement	d≤39mm:GB/T 3098.6; d > 39 mm: by agreement	GB/T 3098.10
Tolerances	Product grade	d ≤ 24 mm and l does not exceed the lesser of 10d and 150 mm: product grade A d > 24 mm or l exceeds the lesser of 10d and 150 mm: product grade B
Tolerances	Standard	GB/T 3103.1
Surface treatment		No treatment ; 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 ; Passivation requirements in accordance with GB/T 5267.4	Simple treatment ; Electroplating requirements in accordance with GB/T 5267.1
Surface treatment		Any other technical requirements or surface treatments shall be agreed between the purchaser and supplier.
Surface discontinuities		GB/T 5779.1	–
Lockwire hole		GB/T 5278
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2

A hexagon head bolt with wire holes in the head for a locking wire. Confirm the hole positions and required finish.

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