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Square Head Bolts · GB/T 8-2021
Square Head & T-Slot Bolts

Square Head Bolts

GB/T 8-2021 (reference only)

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GB/T 8-2021 dimension drawing

Dimensions in mm
GB/T 8-2021 dimension drawing

Specification parameters

Technical conditions and referenced standards
Steel
General technical requirements
  • GB/T 16938
Thread
Tolerances
  • 8g
Standard
  • GB/T 193, GB/T 9146
Mechanical properties
Class
  • d ≤ 39 mm: property class 4.8;
  • d > 39 mm: by agreement
Standard
  • d≤39mm:GB/T 3098.1;
  • d > 39 mm: by agreement
Tolerances
Product grade
  • Product grade C applies except as specified in Clause 4.
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;
  • Any other technical requirements or surface treatments shall be agreed between the purchaser and supplier.
Surface discontinuities
  • GB/T 5779.1
Acceptance inspection and packaging
  • GB/T 90.1, GB/T 90.2

Product overview

Bolts with an external square head. Confirm head clearance, thread length and finish for the installation.

For a quote, share the required dimensions, finish and quantity.