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Flat Washers · GB/T 97.1-2002
Plain & Square Washers

Flat Washers

GB/T 97.1-2002 (reference only)

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GB/T 97.1-2002 dimension drawing

Dimensions in mm
GB/T 97.1-2002 dimension drawing

Specification parameters

Technical conditions and referenced standards
Material
Type
  • Steel
  • Steel
  • Stainless steel
Group
  • –
  • –
  • A2, F1, C1 , A4, C4
Standard
  • –
  • –
  • GB/T 3098.6
Mechanical properties
Hardness class
  • 200 HV
  • 300 HV3)
  • 200 HV
Hardness range
  • 200HV~300HV
  • 300HV~370HV
  • 200HV~300HV
Tolerances
Product grade
  • A
  • A
  • A
Standard
  • GB/T 3103.3
  • GB/T 3103.3
  • GB/T 3103.3
Surface treatment
  • Washers shall be supplied in the natural finish with rust-preventive oil, or with a coating agreed between the purchaser and supplier. ;
  • Electroplating requirements in accordance with GB/T 5267.1;
  • Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2;
  • Quenched and tempered washers shall be coated or plated by a process that avoids hydrogen embrittlement. After electroplating or phosphating, the washers shall be treated immediately by a suitable process to remove detrimental hydrogen. ;
  • All tolerances apply to dimensions before coating or plating.
  • Washers shall be supplied in the natural finish with rust-preventive oil, or with a coating agreed between the purchaser and supplier. ;
  • Electroplating requirements in accordance with GB/T 5267.1;
  • Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2;
  • Quenched and tempered washers shall be coated or plated by a process that avoids hydrogen embrittlement. After electroplating or phosphating, the washers shall be treated immediately by a suitable process to remove detrimental hydrogen. ;
  • All tolerances apply to dimensions before coating or plating.
  • No surface treatment; washers shall have the natural finish.
Surface discontinuities
  • Components shall be free of irregular or detrimental defects. Washer surfaces shall have no protruding burrs.
  • Components shall be free of irregular or detrimental defects. Washer surfaces shall have no protruding burrs.
  • Components shall be free of irregular or detrimental defects. Washer surfaces shall have no protruding burrs.
Acceptance inspection and packaging
  • GB/T 90.1, GB/T 90.2
  • GB/T 90.1, GB/T 90.2
  • GB/T 90.1, GB/T 90.2
1) Other metallic materials shall be agreed between the purchaser and supplier.
2) Applies to chemical composition only.
3) Quenched and tempered.
4) Hardness testing in accordance with GB/T 4340.1.
Test force: HV2 for nominal thickness h ≤ 0.6 mm;
HV10 for nominal thickness 0.6 mm < h ≤ 1.2 mm;
HV30 for nominal thickness h > 1.2 mm.

Product overview

Flat washers provide a bearing surface beneath a bolt head or nut. This series uses normal-series plain washers as its dimensional reference.

Specify the nominal size, inside and outside diameters, thickness, material or hardness, finish and quantity.