Heavy Duty Washers GN 6339

Finish: BT - Blackened finish

Standard Sheet GN 6339 Print This Page Technical Information ISO Fundamental Tolerances

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.

Specification

Steel
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

RoHS

Part Number BT	Part Number GO	d₁ +0.012	d₂ +0.012	s	d₃ +0.012	f	For screws with thread size


6339-6.3-17-3-BT	6339-6.3-17-3-GO	0.25 +0.012	0.67 +0.012	0.12	0.28 +0.012	0.04	M 6
6339-8.4-21-4-BT	6339-8.4-21-4-GO	0.33 +0.012	0.83 +0.012	0.16	0.37 +0.012	0.06	M 8
6339-10.4-25-4-BT	6339-10.4-25-4-GO	0.41 +0.012	0.98 +0.012	0.16	0.45 +0.012	0.06	M 10
6339-12.5-30-6-BT	6339-12.5-30-6-GO	0.49 +0.012	1.18 +0.012	0.24	0.55 +0.012	0.08	M 12
6339-14.5-36-6-BT	6339-14.5-36-6-GO	0.57 +0.012	1.42 +0.012	0.24	0.63 +0.012	0.08	M 14
6339-16.5-40-6-BT	6339-16.5-40-6-GO	0.65 +0.012	1.57 +0.012	0.24	0.71 +0.012	0.08	M 16
6339-18.5-44-8-BT	6339-18.5-44-8-GO	0.73 +0.012	1.73 +0.012	0.31	0.83 +0.012	0.10	M 18
6339-20.5-44-8-BT	6339-20.5-44-8-GO	0.81 +0.012	1.73 +0.012	0.31	0.91 +0.012	0.10	M 20
6339-22.5-50-8-BT	6339-22.5-50-8-GO	0.89 +0.012	1.97 +0.012	0.31	0.98 +0.012	0.10	M 22
6339-24.5-50-10-BT	6339-24.5-50-10-GO	0.96 +0.012	1.97 +0.012	0.39	1.06 +0.012	0.14	M 24
6339-28-60-10-BT	6339-28-60-10-GO	1.10 +0.012	2.36 +0.012	0.39	1.22 +0.012	0.14	M 27
6339-31-68-10-BT	6339-31-68-10-GO	1.22 +0.012	2.68 +0.012	0.39	1.34 +0.012	0.14	M 30

d₁ +0.012	d₂ +0.012	s	d₃ +0.012	f	For screws with thread size

0.25	0.67	0.12	0.28	0.04	M 6
0.33	0.83	0.16	0.37	0.06	M 8
0.41	0.98	0.16	0.45	0.06	M 10
0.49	1.18	0.24	0.55	0.08	M 12
0.57	1.42	0.24	0.63	0.08	M 14
0.65	1.57	0.24	0.71	0.08	M 16
0.73	1.73	0.31	0.83	0.10	M 18
0.81	1.73	0.31	0.91	0.10	M 20
0.89	1.97	0.31	0.98	0.10	M 22
0.96	1.97	0.39	1.06	0.14	M 24
1.10	2.36	0.39	1.22	0.14	M 27
1.22	2.68	0.39	1.34	0.14	M 30

d₁ +0.012

d₂ +0.012

d₃ +0.012

For screws
with thread size

0.25

0.67

0.12

0.28

0.04

M 6

0.33

0.83

0.16

0.37

0.06

M 8

0.41

0.98

0.16

0.45

0.06

M 10

0.49

1.18

0.24

0.55

0.08

M 12

0.57

1.42

0.24

0.63

0.08

M 14

0.65

1.57

0.24

0.71

0.08

M 16

0.73

1.73

0.31

0.83

0.10

M 18

0.81

1.73

0.31

0.91

0.10

M 20

0.89

1.97

0.31

0.98

0.10

M 22

0.96

1.97

0.39

1.06

0.14

M 24

1.10

2.36

0.39

1.22

0.14

M 27

1.22

2.68

0.39

1.34

0.14

M 30

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Part Number

Total US Dollars (net)

$4.21

In Stock: 5

In Stock

Quantity

Please note our quantity discounts (US Dollars).

Min	Max	Price
1	99	$4.21
100	249	$3.86
250	499	$3.51
≥ 500		$3.15

Prop 65: Not compliant

WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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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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.

GN 6339 Heavy Duty Washers Steel, High Type

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GN 6339 Heavy Duty Washers Steel, High Type

Product description

Specification

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