Imperial – Inch Bolt Thread Pitch Chart
So what is a thread’s TPI? (which is an acronym for “Threads per Inch”. As fastener manufactures, we got you covered. Below are the most commonly used thread pitches (TPI’s) for inch bolts and nuts. Making sure that a nut fits a bolt is actually more complicated that just “nuts and bolts”. Seriously speaking, there are many complicated factors creating threads to make sure that they fit properly, and securly. One of the factors is that the threads of mating parts must have the same TPI (threads per 1 inch). However it should be noted that the Metric, DIN, EU standards discuss this feature in reverse and refer to it as a thread’s “pitch” (which is the distance in mm between 2 adjacent threads).
Printable Imperial Thread Pitch Chart & Tapping Chart for UNC & UNF
Imperial - Inch Bolt Thread Pitch Chart
| Size | #6 | #8 | #10 | #12 | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UNC | 32 | 32 | 24 | 24 | 20 | 18 | 16 | 14 | 13 | 12 | 11 | 10 | 9 |
| UNF | 40 | 36 | 32 | 28 | 28 | 24 | 24 | 20 | 20 | 18 | 18 | 16 | 14 |
Imperial - Inch Bolt Thread Pitch Chart (Threads Per Inch - TPI) 2
| Size | 1 | 1-1/8 | 1-1/4 | 1-3/8 | 1-1/2 | 1-5/8 | 1-3/4 | 1-7/8 | 2 | 2-1/4 | 2-1/2 | 2-3/4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UNC | 8 | 7 | 7 | 6 | 6 | 5.5 | 5 | 5 | 4.5 | 4.5 | 4 | 4 | 4 |
| UNF | 14 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| UN8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Why Lightning Bolt for Imperial – Inch Bolt Thread Pitch Chart and inch threaded Fasteners?
Lightning Bolt & Supply has been servicing North America’s industrial fastener needs for over 25 years. Since then, our focus on the production of high quality parts at competitive pricing has allowed us to become an industry leader. Our niche in exotic high nickel alloy fasteners include materials such as: hastelloy, Inconel, monel, A-286, 904L, Alloy-20, duplex stainless as well as many additional alloys.
Being centrally headquartered in Baton Rouge, Louisiana, we are capable of shipping to jobsites all over the world. Many of our industrial projects that we supply material to include anchor bolts, and also stud bolts of many different ASTM grades. These include B7, L7, B16, B8, B8M, stain hardened and many more. In addition to being an ISO certified fastener manufacturer, we were awarded “Corporate Supplier of the Year” by WBENC.
