Difference between IS 1367 Gr. 4.6, 8.8 & 10.9

[v baskar]

Dear Members,

I would like to know difference between IS 1367 Gr. 4.6, 8.8 & 10.9

What does "4.6", 8.8 and "10.9" means....... 

Thankyou

V. B.

[Vino Varghese]

Dear Baskar,

It differ in tensile and yield strength of Fastener material. 

Browse the internet and you will find this basic difference.

Regards

Vino-Doha

V. B.

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[Muthusrinivasan Muthuselvam]

Dear Mr.V.B,

 

for exaple 4.6 means---> first digit 4 refers nominal UTS in hundreds ie., 400 N/sq.mm , second digit .6 means  lower yield stress in tens ie., 60 N/sq.mm

 

br,

 

msms 

V. B.

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[Shivashankrappa Balawat]

Mr.Bhaskar,

 

This is fastener standard for bolts

Grade 8.8 means , Approx. 800 MPa TS and 640 MPa yield strength(  you will arrive at the YS by multiplying the both the numbers times 10. That is 8x8x10=640)

Similarly  , 10.9 means  approx.1000 MPa  TS and 900 MPa yield strength. I have given below the exact details.

 

 

Property Class	Tensile strength,Mpa	Hardness	Material	heat treatment	tempering
4.6	400	B67-B87	low or medium carbon steel witth max limits for C 0.55, P0.048, S0.058	no
4.8	420	B71-B87
5.8	520	B82-B95
8.8	830	C23-C34	medium carbon steel with max limits for C0.28- 0.55, P0.048, S0.058	oil quenched	min 425 deg C
9.8	900	C27-C36			min 410 deg C
10.9	1040	C33-C39			min425  deg C
12.9	1220	C38-C44	medium carbon steel with max limits for C0.31- 0.65, P 0.045 MAX, S 0.045MAX	oil quenched	min 380deg C

 

I hope this will clarify your point. If any questions please don’t hesitate to write.

 

Regards,

 

S C Balawat.

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[Ravishankar G]

Is there any relation to RC or Brinell Harndess to that of the class???

[amol gengaje]

In 4.6 ,4 means 40kg/mm2 tensile & 6 means 0.6 of 40 I.e.24 kg/mm2 yield.similar for other classes.

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[Ajith Kumar]

Hello, This information is very usefull.

Currently I have a requirement to produce M8 --8.8 grade Bolt. 

Can I select material C40 for the same.

Ajith

[Alan Denney]

To the moderator

 

I am disappointed that my mildly worded expression of concern has not been released by you. The original author appears to have little understanding of the subject of high tensile bolts and this merits comment, when lives may be at risk from the product manufactured by that correspondent.

 

Alan

 

Alan Denney

AKD Materials Consulting Ltd

 

From: Alan Denney [mailto:al...@denney1.freeserve.co.uk]
Sent: 19 July 2016 19:45
To: 'material...@googlegroups.com' <material...@googlegroups.com>
Subject: RE: 25120] Re: 16160] Difference between IS 1367 Gr. 4.6, 8.8 & 10.9

 

I am surprised. You appear to be about to make high tensile bolts, but do not understand the grade designation and are asking others to do your material selection for you, and without mentioning the diameter of the bolt which is a critical factor in getting the properties. Making bolts which are fit for service requires in-depth understanding of all aspects of the job.

                                                                                                                                

Alan Denney

AKD Materials Consulting Ltd

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[Alan Denney]

I am surprised. You appear to be about to make high tensile bolts, but do not understand the grade designation and are asking others to do your material selection for you, and without mentioning the diameter of the bolt which is a critical factor in getting the properties. Making bolts which are fit for service requires in-depth understanding of all aspects of the job.

                                                                                                                                

Alan Denney

AKD Materials Consulting Ltd

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Ajith Kumar

Sent: 19 July 2016 07:27
To: Materials & Welding <material...@googlegroups.com>

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