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Vikas e.v
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Join Date: Mar 2018
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Difference Between DIN 434 & DIN/EN 6918

03/18/2018 5:46 AM

What is difference between DIN 434 square taper washer & DIN/EN 6918 square taper washer?

Can I use DIN 434 in place of DIN/EN 6918 Washer?
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spades
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#1

Re: Difference Between DIN 434 & DIN/EN 6918

03/18/2018 6:40 PM

Depends on the situation. If it's a high tensile one then stick with the 6918.

Whilst the two types may have the same external dimensions for a given bolt size, the 6918s have a tighter tolerance in the actual hole size and are generally a bit heavier - whether that's due to metallurgy or the extra meat around the hole I have never been able to decide.
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RAMConsult
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#2

Re: Difference Between DIN 434 & DIN/EN 6918

03/18/2018 6:43 PM

Material, finish, strength, and most importantly whether your client will accept/approve the substitution. Although dimensionally similar, one is intended for fastening U-channel, the other is intended for fastening structural steel members.

Given what just happened in Florida, you better be real sure which is the correct one to use, otherwise no substitutions are allowed.

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tonyhemet
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#3

Re: Difference Between DIN 434 & DIN/EN 6918

03/19/2018 12:32 AM

Using a substitute may gain you more profit in the short term, but you may lose more profit in the long run if you have go on a call back to replace a part or an assembly.

If you can, sell the client the best parts available. If the client balks at this, have client countersign a notation where the client accepts full responsibility in case of failure.
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PWSlack
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#4

Re: Difference Between DIN 434 & DIN/EN 6918

03/19/2018 3:55 AM

<...Can I...> CR4 is not a permission-giving entity, nor does it assess the competence of contributors.

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Codemaster
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#5
In reply to #4

Re: Difference Between DIN 434 & DIN/EN 6918

03/19/2018 4:54 AM

I know "Can I....." and "May I....." are often used interchangeably, and possibly English is not the OP's first language, but to be pedantic, "Can I....." means "Am I able to...." which of course he is. "Am I allowed to...." (by this forum, presumably) would be "May I.....".

Neither is exactly right in this case, but we know what he means. He wants to know whether there is any engineering reason why he has to use one or the other.

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Whitephone
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#6

Re: Difference Between DIN 434 & DIN/EN 6918

03/19/2018 5:11 AM

Hardness is different

tandard referenceMaterialHardness range
EN 14399-6carbon steelHV 300÷370
UNI 5716/DIN 6918carbon steelHV 300÷370
UNI 6598/DIN 434steelHV 100÷250
DIN 7989-1steelHV 100÷250
DIN 7349steelt<=6 HV 200÷300
DIN 7967spring steelHV 350÷425
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Randall
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#7

Re: Difference Between DIN 434 & DIN/EN 6918

03/19/2018 6:56 AM

434

Seems to be countersunk

434 dimensions definitions and 8% taper

6918 dimensions and 14% taper

434 dimensions

6918 dimensions

I'd've thought that the difference in taper 8% to 14% would be a killer.

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Codemaster
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#8
In reply to #7

Re: Difference Between DIN 434 & DIN/EN 6918

03/19/2018 9:44 AM

GA for that!

I'm surprised those washers have DIN nos, they look like special items to me. Unless they're for structural steelwork, to use with tapered flanges. Any idea what the grooves are for?

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Randall
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#9
In reply to #8

Re: Difference Between DIN 434 & DIN/EN 6918

03/21/2018 4:31 PM

Haven't a clue: I started a new thread

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Codemaster
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#10
In reply to #9

Re: Difference Between DIN 434 & DIN/EN 6918

03/23/2018 5:28 AM

Thanks for that. Some interesting comments on the other thread.

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Randall
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#11

Re: Difference Between DIN 434 & DIN/EN 6918

03/23/2018 7:04 AM

Vikas,

See the other thread linked above:

A DIN 435 would be a better substitute if you don't need the countersinking.

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4u
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#13
In reply to #11

Re: Difference Between DIN 434 & DIN/EN 6918

03/24/2018 12:10 PM

Kindly post a a picture of DIN 435 for better understanding.
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Randall
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#14
In reply to #13

Re: Difference Between DIN 434 & DIN/EN 6918

03/24/2018 2:04 PM

Just do a google search for "DIN 435"

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Anonymous Poster #1
#12

Re: Difference Between DIN 434 & DIN/EN 6918

03/24/2018 12:07 PM

Considering plenty of CR4 replies in the past available in this site;

single google search or massive internet search would have been bring all the required information about DIN and related queries.
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