ASME B18.6.3: machine screw torque values? 3

[lee4]

Am I correct that ASME B18.6.3 addresses torque for 18-8 stainless-steel machine screws, PPH & PFH (Philips pan head & flat head)?

Where is the best place to buy a copy of just the ASME B18.6.3 spec?

I am guessing that these are suggested maximum installation torques, but I have not been able to verify it:
4-40: 5.2 in-lbs
6-32: 9.6 in-lbs
8-32: 19.8 in-lbs
10-32: 31.7 in-lbs.

Thank you,
Lee

 

[vpl]

I'm not an expert in this area, so I could well be wrong; however, a quick browse of the standard did not reveal any torque values. The Introduction states that the standard provides general and dimensional data for various slotted
and recessed head machine screws and machine screw
nuts. The appendices provide information about "protrusion," "across-corners," "penetration" and "wobble" gaging for various types of screws (not all apply to all types). There is also appendices on wrench openings, thread dimensions, and the formulas on which dimensional data is based.


As far as where to get just the single standard, I'd try ASME itself.


Patricia Lougheed

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

 

[unclesyd]

Here is a little information to get you started. Watch out for the nondescript imported screws as they can vary all over the map in the same box. Make sure you test same.

http://www.mgtd.ca/Screw Torque.htm

 

[KENAT]

LEE4, one thing to be careful with, most torque tables, including the ones unclesyd linked (which are more helpful than most I've found) still assume 'bolt & nut'.

Here we have a lot of cases where the screws/bolts aren't going into a nut but a threaded hole in a component. Sometimes with less effective threads than a nut would have.

So you have to be careful when using these charts that they truely reflect your situation.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?