GN 6339 Heavy Duty Washers Steel, High Type


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

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

RoHS compliant

Technical drawing

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GN 6339 Steel Heavy Duty Washers, High Type sketch

Part Options / Table

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Dimensions in: Inch | Metric
d1 +0.012d2 +0.012sd3 +0.012fFor screws
with thread size
0.250.670.120.280.04M 6
0.330.830.160.370.06M 8
0.410.980.160.450.06M 10
0.491.180.240.550.08M 12
0.571.420.240.630.08M 14
0.651.570.240.710.08M 16
0.731.730.310.830.10M 18
0.811.730.310.910.10M 20
0.891.970.310.980.10M 22
0.961.970.391.060.14M 24
1.102.360.391.220.14M 27
1.222.680.391.340.14M 30

Build & Price

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

Technical information


Outside diameter d2
The outside diameter d2 of the lower type refers to washers DIN 125 / ISO 7089, and the higher type to washers DIN 7349.

Chamfer face diameter d3
This dimension is, together with the chamfer angle α 70 and the inside diameter d°1°, the most important dimension of these heavy duty washers. Diameter d°3°° is actually, even in the lower tolerance range, larger than the max. 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 underhead radius causing an indentation on the bolt which would damage the bolt.

Inside diameter d1
The inside diameter d1 is kept as small as possible ensuring that the bolt is inserted centrically into 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 max. contact area diameter of the bolt head.

Chamfer angle α = 70° ± 2°
This relatively large angle is necessary when using hexagon 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 d°1° and d°3°°, this radial clearance is sufficient for all bolts according to DIN EN.

Lead height h
This is the height of the cylindrical part of the internal diameter d1, h should be as high as possible in relation to the pitch of the thread of the bolt.

Washer thickness s
Washers GN 6339 are higher when compared with DIN washers (exception: DIN 7439 which is equal to the high type).
A larger thickness leads to a stronger washer. As a result, bearing in mind the chamfer d3, a minimum height is established which ensures that the bolt thread will not be damaged when the bolt is tightened.

Selected Part

Total US Dollars (net)
In stock: 5
In Stock
Please note our quantity discounts (US Dollars).
≥ 500$2.59
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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