Hexagon Head Bolts

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Standard / drawing type Nominal size d

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Equivalent standards

Standard	Standard body

Technical conditions and referenced standards

		Steel	Stainless steel
General technical requirements		GB/T 16938
Thread	Tolerances	6ga
Thread	Standard	GB/T 197
Mechanical properties	Property class	M3 ≤ d ≤ M39: property classes 4.8, 5.6, 8.8, 10.9 and 12.9 /12.9 b; d > M39: property classes 8.8 and 10.9; d < M3: by agreement ; d > M39: by agreement, except for property classes 8.8 and 10.9
	Group and property class		M1.6≤d≤M24:A2-70, A4-70, A4-80, D4-80, D6-80; M24<d<M36:A2-50, A2-70, A4-70, A4-50, D4-70, D6-70; d > M39: by agreement
	Standard	M3≤d≤M39:GB/T 3098.1; d > M39: property classes 8.8 and 10.9 in accordance with GB/T 3098.23; d < M3: by agreement, except for property classes 8.8 and 10.9; d > M39: by agreement, except for property classes 8.8 and 10.9	d≤M39:GB/T 3098.6; d > M39: by agreement
Tolerances	Product grade	d ≤ M24 and l ≤ 10d or 150 mm d: product grade A (except dw,min=smin− IT15 where d ≤ M5); d > 24 mm or l > 10d or 150 mm d:B
Tolerances	Standard	GB/T 3103.1
Surface treatment		No treatment (uncoated and unplated) ; Electroplating requirements in accordance with GB/T 5267.1; Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2; Hot-dip galvanizing requirements in accordance with GB/T 5267.3	Simple treatment (cleaning and polishing) ; and/or ; Passivation e
Surface treatment		Any other technical requirements or surface treatments shall be agreed between the purchaser and supplier.
Surface discontinuities		Property classes 4.8, 5.6, 8.8 and 10.9: GB/T 5779.1; Property class 12.9/12.9: GB/T 5779.3	By agreement f
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2
a Depending on the coating type, the thread tolerance position for uncoated fasteners may be specified in accordance with the relevant coating standard. b Fasteners of property class 12.9/12.9 are susceptible to hydrogen embrittlement. See GB/Z 41117. c The most widely used stainless steel groups are A2 and A4. Depending on the application, other groups specified in GB/T 3098.6 for corrosive environments may be needed. GB/T 3098.24 specifies mechanical properties at service temperatures up to +800 °C. See also GB/T 3098.25 for selection of the appropriate stainless steel group. d Use the lesser value. e GB/T 5267.4 specifies passivation methods. f See GB/T 5779.1 for guidance.

		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	d < 3 mm: by agreement; 3 mm ≤ d ≤ 39 mm: property classes 5.6, 8.8 and 10.9; 3 mm ≤ d ≤ 16 mm: property class 9.8; 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	3mm≤d≤39mm:GB/T 3098.1; d < 3 mm: by agreement; 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 discontinuities		GB/T 5779.1	–
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.
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2

Product overview

Partially threaded hex head bolts have a smooth shank between the head and the threaded end. The photo shows this thread style.

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Hexagon Head Bolts

GB/T 5782-2025 dimension drawing

Specification parameters

Equivalent standards

Technical conditions and referenced standards

Product overview