Screw help

[RedRabbit]

These bolts came included with a bench, but they are too short. I was liking for something 50 or 60mm but I can’t find the right diameter. Does anybody have advice? They are Allen screws and will bear weight.

 

[jdewitt]

It's a standard metric size look for m8x60mm socket head cap screws (bolts) if you want 60mm long.

 

[whateg01]

If they thread into threaded holes, measure the distance between the crests of the threads. If it's 1.25mm, then the screw pitch is 8mmx1.25mm. (Hint: measure over several threads and divide!) If it doesn't screw into anything, 5/16" may be more common for you and easier to get.

Dave

 

[RedRabbit]

Thank you both. I'll look for M8 and measure the pitch

 

[whateg01]

If you are buying local, take one of those short screws with you to match the thread pitch.

Dave

 

[JoeMcGov]

If you are buying local, take one of those short screws with you to match the thread pitch.

Dave

Yup. Find a nut that perfectly mates with your screw. Then find your new bolt and make sure it too fits the nut. Go pay. Done.

 

[cherrybomb]

At our Ace Hardware, especially in the metric fasteners, guys that don't understand the metric pitch,seem to toss the fasteners back in the wrong bins.Our Ace has a bolt and nut guage,check your bolt,find a nut,that mates.Now find your desired longer length bolt and check every bolt with that nut.Might save you a trip back.Don't ask how I know this.

 

[Spacey_G]

If a screw is just marked M8, it's probably M8x1.25. Measure it or check it with a gauge for sure, but that would be my guess.

That's a normal socket head cap screw. Assuming it's 1.25mm pitch, this is what you're looking for: https://www.mcmaster.com/90128A281

Edit: If it's only mildly magnetic, this is the one you're after: https://www.mcmaster.com/91292a209