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/diy/ - Do It Yourself

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File: 110 KB, 1000x1000, assorted-box-of-machine-screws-body-screw-countersunk-pozi-metric-250-pieces-ab135n-p2319-4429_image.jpg [View same] [iqdb] [saucenao] [google]
1699977 No.1699977 [Reply] [Original]

Can one of you kind gentlemen please give me a rundown on machine screws?
Identifying the head is easy enough but how do you identity the thread?
If I have an unknown screw or an object with a missing screw how do I know what screw type to order?

I assume perhaps the easiest way is to have a selection known of screws you can compare the screw to / try to fit in the hole, but what screws should I acquire for this purpose? Are there only a handful of different thread types that are used in commercial products?

>> No.1699981

Go to a hardware store and get one of each type of screw, metric and sae. Try until you find one that fits. That's the thread you have.

Myself, I've been around them enough that I can typically tell you what it is by looking at it

>> No.1699989
File: 14 KB, 342x342, 9117A961-59D8-403D-AB6A-70A9547AE588.jpg [View same] [iqdb] [saucenao] [google]
1699989

>>1699977
There’s some different measuring devices. If you can figure out the diameter of the screw and whether it’s metric or SAE, there’s only a couple common types of threads and that should be easy to tell by looking at it.

>> No.1699991

>>1699977
https://www.amazon.com/Bolt-Thread-Checker-Inch-Metric/dp/B003FJW0GK
wa la

>> No.1699992

>>1699991
Seems like one of those things that would be useful but I'm not sure if it really would be.
Not OP by the way.

>> No.1700009
File: 10 KB, 440x363, ScrewThreads[1].gif [View same] [iqdb] [saucenao] [google]
1700009

>>1699977
Calipers, a thread diameter chart, and a thread gauge
>>1699989

>> No.1700023
File: 21 KB, 425x354, 719E1rVeF2L._SX425_.jpg [View same] [iqdb] [saucenao] [google]
1700023

I use these gauges often.

>> No.1700031
File: 802 KB, 1023x729, starrett-tap-drill-chart-pdf_356585.png [View same] [iqdb] [saucenao] [google]
1700031

>>1700009
This guy gets it. I will add a pair of calipers and this chart is my preference.

>> No.1700033

>>1700009
This is how I do it, its foolproof

>> No.1700924

>>1699977
get a plastic bolt gauge, they usually in both imperial and metric. you can identify bolts and nuts very quick, even wood screws

https://www.homedepot.com/p/Everbilt-12-in-Plastic-Bolt-Gauge-801004/204276636

>> No.1701048

>>1699989

I got one of these SAE metric thread gauges for about $10 on eBay. Starrett, a reputable brand. If I had cared, I could have paid even less.

>> No.1701927

>>1700023
What are these centipede looking things called?

>> No.1702084

>>1699977
it's pretty easy to measure the width and pitch of a thread with vernier calipers

>> No.1702096

>>1701927
Anal Beads

>> No.1702185

>>1701927
Thread checker.

>> No.1702187

>>1699977
1: Screw/Thread pitch Gauge

2: Bolt/screw size gauge or vernier calipers.

3: Bolt chart

>> No.1702510
File: 19 KB, 400x328, Anal Beads.jpg [View same] [iqdb] [saucenao] [google]
1702510

>>1702096