GN 6339 Heavy Duty Washers Steel, Low Type


GN 6339 Steel Heavy Duty Washers, Low Type Finish: BT - Blackened finish
Finish: BT - Blackened finish
GN 6339 Steel Heavy Duty Washers, Low Type Finish: BT - Blackened finish GN 6339 Steel Heavy Duty Washers, Low Type Finish: GO - GEOMET 500 coating

Product description


The effect of a washer on the quality of a threaded connection is often underestimated. GN 6339 washers provide a high quality connection. High static clamping forces can be achieved without loss of tension.

At a specified preloaded clamping force, a smaller diameter threaded bolt can be used. This can result in a better ratio between clamping distance and bolt diameter, minimizing the danger of failure.

The tempered, smooth bolt head / screw contact face results in a lower and more constant friction co-efficient, even when continuous tightening and untightening is required.

GN 6339 washers are suitable only for machine construction bolts of property classes 8.8 / 10.9 / 12.9, and not for DIN 6914 steel bolts.


European Standard No. 1.7227 (42CrMoS4V)

  • Tempered to tensile strength
    Rm = 1220 - 1400 N/mm2
  • Precision-turned and ground
  • Blackened finishBT
  • GEOMET 500 coatingGO
  • GEOMET 500 coatingGO


Technical drawing

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GN 6339 Steel Heavy Duty Washers, Low Type sketch

Part Options / Table

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Dimensions in: Inch (change to Metric)
d1 +0.012d2 +0.012sd3 +0.012fFor screws
with thread size
0.250.470.100.280.02M 6
0.330.630.100.370.03M 8
0.410.790.120.450.03M 10
0.490.940.140.550.04M 12
0.571.100.140.630.04M 14
0.651.180.160.710.04M 16
0.731.340.200.830.06M 18
0.811.460.200.910.06M 20
0.891.570.200.980.06M 22
0.961.730.201.060.06M 24
1.101.970.241.220.06M 27 30
1.462.600.281.570.08M 36

Build & Price

3D Product Configurator
Inner diameter d1
Outer diameter d2
Thickness s

Technical Information

Sketch GN 6339

Outer diameter d2
The outer diameter d2 of the low type corresponds to DIN 125 / ISO 7089 washers. The high type corresponds to DIN 7349 washers.

Chamfer diameter d3
Together with the chamfer angle α 70° and the inner diameter d1 , this dimension is the most important one of these heavy duty washers. Even in the lower tolerance range, the diameter d3 is generally larger than the maximum contact under head diameter on a bolt.
This will ensure that the chamfer of d3 of the hardened washer will not be pressed into the under head radius causing an indentation which would damage the bolt.

Inner diameter d1
The inner diameter d1 is kept as small as possible ensuring that the bolt is guided centrically in the washer. The choice of a matching pair of bolt and washer with least radial clearance is important in order to avoid a mismatch between chamfer diameter d3 and the maximum contact area diameter of the bolt head.

Chamfer angle α = 70° ± 2°
This relatively large angle is necessary when using hex headed bolts to avoid interference with the chamfer diameter d3 of the washer.

Chamfer edge F
The extended chamfer edge F, as seen from d3, and d1 create an edge that provides the smallest radial clearance towards the transition from bolt shank to head. Even with the minimum chamfer angle of α = 68° and the smallest dimensions for d1 and d3, this radial clearance is sufficient for all bolts according to DIN EN.

Guide height h
This is the height of the cylindrical part of the inner diameter d1. The dimension h should be as high as possible in relation to the thread pitch of the bolt.

Washer thickness s
GN 6339 heavy duty washers are higher than comparable DIN washers (exception: DIN 7439 which is equal to the high type).
A larger thickness leads to a stronger washer. In addition, taking the chamfer d3 into consideration, a minimum guide height is provided which ensures that the thread will not be damaged when tightening.

Selected Part

Total US Dollars (net)
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Please note our quantity discounts (US Dollars).
≥ 500$2.43
Prop 65: Not compliant
Cancer and Reproductive Harm -
RoHS: Compliant
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Weight: 0.004 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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