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5 comments
Associate

Join Date: Jun 2007
Location: Carlow, Ireland
Posts: 41

12.9 Bolts - Material Grade and Heat Treatment

01/22/2009 3:24 AM

Hello, I have been asked to quote for some special bolts with 12.9 spec but I cannot find grade of material and heat treatment to use.

Can anybody help.

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Guru

Join Date: Mar 2007
Posts: 2546
Good Answers: 105
#1

Re: 12.9 bolt spec

01/22/2009 8:25 AM

The material for bolts will be allow steel- hardened and tempered condition,

A few sites that may be useful to you are

http://euler9.tripod.com/bolt-database/22.html

http://mdmetric.com/fastindx/t17u.pdf

Also the home page of this site will give you a lot of useful information on fasteners

http://mdmetric.com/fastindx/inxtst.htm

http://www.co-design.co.uk/dpg/bol/bol6.html

Hope these will be enough

The last link permits Carbon steel also, however our experience (as users) has shown that the fasteners when they are made of C-Steel and heat treated to achive properties, have not fared well and failures in operationwere very high.

We specify EN 10083 - 42CrMo4,

The exact material may be selected based on the above guidelines.

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Anonymous Poster
#2

Re: 12.9 Bolts - Material Grade and Heat Treatment

01/22/2009 12:17 PM

12.9 bolts are made to ASTM A574M

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Participant

Join Date: Jan 2009
Posts: 1
#3

Re: 12.9 Bolts - Material Grade and Heat Treatment

01/23/2009 6:29 AM

we use sae4140 or en-19/en-24 as per the application /cost - as per the requirements of the consumer

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Power-User

Join Date: Feb 2008
Posts: 246
Good Answers: 4
#4
In reply to #3

Re: 12.9 Bolts - Material Grade and Heat Treatment

01/23/2009 5:39 PM

SAE or AISI 4140, or ASTM A322 grade 4140 is equivalent to the German 42CrMo4.

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Power-User

Join Date: May 2008
Posts: 382
#5

Re: 12.9 Bolts - Material Grade and Heat Treatment

01/23/2009 8:21 PM

Special bolts or studs (no stock from suppliers and urgent)were made to me so:

12.9:sae4140 heat treatment;10.9:sae4140 not heat treatment;8.8:sae 1045 if it is smaller diameter than 1''.When you are in doubt use 4140 with heat treat.or when was needed fast and not time for h.t. i used sae4340,even better than 4140:150 kg/mm2 versus 120 kg/mm2 (both with h.t.).Of course this just in case you are from a common workshop trying supply fast your customer...not for a regular bolts manufacturer who,i think, should try its own sources for standards.-

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