GN 6339 Heavy duty washers low type

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GN 6339 Heavy duty washers, low type Finish: BT - blackened
Finish: BT - blackened
GN 6339 Heavy duty washers, low type Finish: BT - blackened GN 6339 Heavy duty washers, low type Finish: GO - GEOMET 500-treated

Product description

Information

The influence of a washer on the quality of the screwed connection is very often underestimated. With washers GN 6339, high quality preloaded screwed connections can be established.

A high static clamping force can be reached avoiding loss of tension.

At a specified preloaded clamping force it is often possible to use thinner bolts. This can result in a better ratio between clamping distance and bolt diameter to minimise the danger of failure.

The case hardened smooth bolt head/screw contact face leads to a lower and more constant friction co-efficient even when continuous clamping and releasing operations are required.

Washers GN 6339 are only suitable for machine construction bolts of classes 8.8 / 10.9 / 12.9, and not for steel bolts DIN 6916.

Specification

Steel, 1.7227 (42 CrMoS 4 V)
  • case hardened to tensile strength
    Rm = 1220 ... 1400 N/mm²
  • fine machined and slide ground

blackenedBT

GEOMET 500-treatedGO


RoHS

Technical drawing

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GN 6339 Heavy duty washers, low type sketch

Article options / Table

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d1d2sd3ffor screws
with thread size
6,3122,570,6M 6
8,4162,59,50,75M 8
10,420311,50,75M 10
12,5243,5141M 12
14,5283,5161M 14
16,5304181M 16
18,5345211,5M 18
20,5375231,5M 20
22,5405251,5M 22
24,5445271,5M 24
28506311,5M 27
31566341,5M 30
37667402M 36

Build & Price

Specifications

Inner diameter d1
Outside diameter d2
Height s
Finish


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, which usually have a tapered transfer from shank to head (the so-called trumpet) to avoid fouling of the washer.

Chamfer edge F
The extended chamfer side F as seen from d3 creates with d1 an edge the so-called trumpet of the transfer from shank to head of the bolt, so that the smallest radial clearance prevails. Even with the smallest angle of 680 and the lower dimension of d3 and d1 the radial clearance of all bolts to DIN EN is still sufficient.

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 (How to order)

Weight: 0,002 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
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)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 Euro -> 10 % discount
from 275,00 Euro -> 20 % discount
from 375,00 Euro -> 30 % discount
With a total value (net) per order:
All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.

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