Need a source for 7/16-40 LH Threaded Bolts

Tap the female a standard size right hand thread.

It has to be Left Hand Thread. It's for a Dual Shaft Buffer motor and I have to have the CW chaft have LH threads...long story....Just can't find thay bolt.

Tom Gardner (nospam) wrote:

Can't you double-nut it? Think out of the box! If you only need one, make it on a lathe.

I live out of the box. I've already tapped the hole. I think I'm going to have to make one as you suggested.

Tom Gardner (nospam) wrote:

I assume you mean 7/16-14? McMaster carries LH threaded rods and nuts - loctite or weld a nut onto a piece of threaded rod and make a cap screw.

Threaded rod: Finish Overall Length Each Plain 6' 93240A032 $6.97 Zinc-Plated 36" 90036A032 3.89

Nuts: Steel Plain Finish Grade 2 1/4" American National Standards Institute (ANSI), American Society of Mechanical Engineers (ASME) 90083A217 $8.67 per Pack of 50 Grade 2 3/8" American National Standards Institute (ANSI), American Society of Mechanical Engineers (ASME) 90519A261 7.54 per Pack of 50 Grade 5 3/8" Not Rated 95140A135 5.89 per Pack of 25 Zinc-Plated Finish Grade 2 3/8" American National Standards Institute (ANSI), American Society of Mechanical Engineers (ASME) 93425A220 $13.90 per Pack of 50 Grade 5 1/4" American National Standards Institute (ANSI), American Society of Mechanical Engineers (ASME) 99612A122 7.35 per Pack of 25 Grade 8 3/8" American National Standards Institute (ANSI), American Society of Mechanical Engineers (ASME) 99891A130 12.21 per Pack of 25