descartesfool

To add a little more to the bolt strength issue, I found a couple of links that make for a handy reference.

http://www.sizes.com/tools/bolts_SAEtork.htm

and for metric bolts, you might not have known what the numbers mean

http://www.sizes.com/tools/bol...s.htm

Metric bolt torque values in ft-lbs

http://dodgeram.org/tech/specs/bolts/M_bolts.html

or here in kg-m or N-m

If you are really sophisticated with your torque wrench, torque value depends on friction which depends upon lubrication and finish (tell that to your garage mechanic). Put some moly on it and you can torque that sucker less because the head isn't grabbing and all torque is transferred to the bolt shaft!
http://mdmetric.com/fastindx/t20u.pdf
http://mdmetric.com/fastindx/t21u.pdf
http://www.brook-tech.fsnet.co...s.pdf

Metric stainless torque values (see how low the torque values are)

http://mdmetric.com/fastindx/t29u.pdf

A handy conversion chart from ft-lbs to N-m for torque (for your engine or your lug nuts!)

http://www.sizes.com/units/charts/Ftlbus.pdf

or this one http://mdmetric.com/tech/scale1.pdf

Metric standard sizes

http://www.sizes.com/tools/thread_metric.htm

American Standard Screw sizes, drill and tap info also

http://www.sizes.com/tools/thread_american.htm

Tapping drills for metric and coarse

http://www.brook-tech.fsnet.co...s.pdf

Clearance hole sizes

http://www.brook-tech.fsnet.co...e.pdf

and the best chart of all I think

http://mdmetric.com/tech/torqcht1a.pdf

Just a few pages to decorate your shop with.

FormulaIntegra

Excellent information. This should be stickied!