GN 6339 Heavy duty washers, high type

d₁ H13	d₂ h13	s	d₃ H13	f	for screws with thread size

6,3	17	3	7	1	M 6
8,4	21	4	9,5	1,5	M 8
10,4	25	4	11,5	1,5	M 10
12,5	30	6	14	2	M 12
14,5	36	6	16	2	M 14
16,5	40	6	18	2	M 16
18,5	44	8	21	2,5	M 18
20,5	44	8	23	2,5	M 20
22,5	50	8	25	2,5	M 22
24,5	50	10	27	3,5	M 24
28	60	10	31	3,5	M 27
31	68	10	34	3,5	M 30

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.

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Total (net)

1,82 €

plus VAT 0,35 €
gross 2,17 €

In stock

Weight: 0,002 kg

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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)).

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All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.