Torque settings for suspension

[GeoffW]

Here's my next attempt to keep the forum ticking over better than my Clubsport. Does anyone have a comprehensive list of torque settings for the suspension & brakes etc? Or a general rule of thumb they use, thanks Geoff

[lanan]

This can be quite useful


The values are stated in foot pounds.

A-74,000 psi Low Carbon Steel SAE Grade 3
B-100,000 psi Med Carbon Steel SAE Grade 5
C-120,000 psi Med Carbon Heat T. Steel SAE Grade 6
D-133,000 psi Med Carbon Temp. Steel SAE Grade 7
E-133,000 psi Med Carbon Alloy Steel SAE Grade 8
F-150,000 psi Med Carbon Alloy Steel

Bolt TPI - A .. B .. C .. D ... E .... F
1/4 ..20 - 6 - 9 -10 - 12.5 -13 - 14

5/16 18 -12 -17 -19 -24 -25 -29

3/8 16 -20 -30 -33 -43 -44 -47

7/16 14 -32 -47 -54 -69 -71 -78

1/2 13 -47 -69 -78 -106 -110 -119

9/16 12 -69 -103 -114 -150 -154 -169

5/8 11 -96 -145 -154 -209 -215 -230

3/4 10 -155 -234 -257 -350 -360 -380

7/8 9 -206 -372 -382 -550 -570 -600

1 8 -310 -551 -587 -825 -840 -700

1-1/8 7 -480 -794 -872 -1304 -1325 -1430

1-1/4 7 -375 -1105 -1211 -1815 -1825 -1975

1-3/8 6 -900 -1500 -1624 -2434 -2500 -2650

1-1/2 6 -1100 -1775 -1943 -2913 -3000 -3200

[BertBert]

what, you don't use the QT-T-FT method?
Bert

[lanan]

FT covers most applicationsit, it is true..

[BertBert]

And you've seen the high quality of my spannering!!

Bert

[Count Johnny]

Geoff
The figures that IanIan gives are great, but - unless you carefully sourced your fasteners yourself - it is almost impossible to tell whether your male fastener is at the top or the bottom of the tree.

It is also inconsiderate of the female material (which may be an alloy casting) and a host of other factors - all of which can make a massive difference to the torque that you can apply.

To really understand this subject, you should read Carroll Smith’s ‘Nuts, Bolts, Fasteners and Plumbing Handbook’ but a neat trick is to follow Jedi’s (Jedi Racing Cars, that is) practice and (when in doubt) be guided by the recommended torque settings that most closely apply within a modern motorcycle workshop manual.

Therein, you'll find plenty of figures for fasteners of pretty good quality in a host of different applications. Use your head, and you won't be far wrong.