Disclaimer: The information on this page has not been checked by an independent person.   Use this information at your own risk.
ROYMECH

Click arrows to page adverts



These Pages include various standards. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use.
BSI Shop
It is also possible to become a BSI member and obtain copies of the Standards at much reduced prices.

Home
Screws Index Page...

Tensile and Proof Stress Of Metric Bolts and Screws. (Carbon Steel )

Indicated stresses in Newton/mm2

Strength Designation 3.6 4.6 4.8 5.6 5.8 6.8 8.8
=< 16mm
8.8
> 16
9.8 10.9 12.9
Nom. Tensile Strength 300 400 400 500 500 600 800 800 900 1000 1200
Min Tensile Strength 330 400 420 500 520 600 800 830 900 1000 1200
Lower Yield Stress 180/190 240 320/340 300 400/420 480 - - - - -
Stress at Perm. Set - - - - - - 640 640/660 720 900/940 1080/100

In accordance with BS 3692:2001 and BS EN IOS 898-1 : 1999

Tensile Strength Of Metric Nuts

Indicated stresses in Newton/mm2



Strength Designation 4 5 6 8 10 12
Tensile Strength 400 500 600 800 1000 1200

In accordance with BS 3692:2001

The designation system allows the determination of the ultimate and yield/proof strength of the bolt. The designation system is based on two numbers e.g 8.8 .  The first number is the tensile strength of the bolt material (N2 )/100.  The second number is = 1/100.(the ratio of the Proof (or Yield ) stress and the Tensile strength expressed as a percentage = 100.[Yield (Proof stress) /Tensile strength] /100

The tensile and proof strength of the steel for a 4.6 bolt is therefore calculated as follows

Tensile strength (Rm) = 4.100 N/mm2 = 400 N/mm2 .... Proof strength (R0,2) = 0,6*400 * 100 /100 = 240 N/mm2


Tensile and Proof Stress Of Metric Bolts and Screws. (Stainless Steel )

Stainless steels include Austenitic, Martensitic and Ferritic..

Austenitic stainless steels..
Chromium nickel steels which can be cold worked. Non magnetic.
Associated grades ( Steel Number according to BS EN 10088 pt 1) = A1 (1.4305) , A2 (1.4301) ,A3 (1.4541) , A4 (1.4401) and A5 (1.4571).

Martensitic stainless steels ..
Limited corrosion resistance but can be heat treated for superior strength properties. Magnetic Properties.
Associated grades ( Steel Number according to BS EN 10088 pt 1) = C1 (1.4006 etc) , C3 (1.4057), C4(1.4104)

Ferritic stainless steels ..
Plain chromium stainless steels with a chromium content varying between 10.5 and 18% and a low carbon content. They not hardenable by heat treatment. Ferritic alloys have good ductility and formability but a relatively poor high temperature strength compared austenitic grades. Magnetic..
Associated grades = F1

Tensile and Proof Stress Of Metric Bolts and Screws. (Stainless Steel )

Indicated stresses in Newton/mm2

Stainless Steel Austenitic Martensitic Ferritic
Steel Grade A1, A2, A3, A4, A5 C1,C4 C1 C3 F1
Strength class 50 70 80 100 50 70 110 80 45 60
Tensile Strength 500 700 800 1000 500 700 1100 800 450 600
0,2% proof stress 210 450 600 750 250 410 820 640 250 410
Relevant Links
  1. Boltscience bolt strength..Detailed notes
  2. Screw strength calculator..short 1 page informatin sheet with calculator

This Page is being developed



Home
Screws Index Page...

Please Send Comments to Roy Beardmore

Last Updated 24/01/2013