Nominal Size and Threads Per In. Basic Pitch Dia. Basic Pitch Dia.
3⁄8 – 16 0.3344 0.3479
7⁄16 – 14 0.3911 0.405
1⁄2 – 13 0.45 0.4675

How many threads per inch is UNC?

Threads in the UNC, UNF & UNEF designations have a fixed number of threads per inch (tpi) for a special diameter. For example, 5/16” UNC has 18 tpi, 5/16” UNF has 24 tpi, and 5/16” UNEF has 32 tpi.

How many TPI is 3/8 UNF?

Nominal Diameter Major Diameter Inch TPI
3/8″ – 24 UNF 0.375 24
7/16″ – 20 UNF 0.438 20
1/2″ – 20 UNF 0.500 20
9/16″ – 18 UNF 0.563 18

### What is the thread count on a 3/8 bolt?

Table 3.

Coarse Fine
3/8-16 3/8-24
7/16-14 7/16-20
1/2-13 1/2-20
9/16-12 9/16-18

What is the pitch of a 3/8 16 UNC thread?

0.375

Nominal Diameter Major Diameter Inch Pitch mm
3/8″ – 16 UNC 0.375 1.587
7/16″ – 14 UNC 0.438 1.814
1/2″ – 13 UNC 0.500 1.954
9/16″ – 12 UNC 0.563 2.117

What is the difference between UNC and UNF threads?

There are two main kinds of threads in the Unified Screw Thread (UST) Standard—UNF and UNC. UNF is the designation for Unified Fine Threads. Meanwhile, UNC denotes Unified Coarse Threads. UNC threads are a type of coarse thread that has an unbroken series of right-hand turns with uniform geometry.

#### What thread is 32 TPI?

UNF – Unified National Fine Threads

Major Diameter (in) Threads per inch (tpi) Pitch (mm)
#8 – 36 36 0.705
#10 – 32 32 0.794
#12 – 28 28 0.907

What does UNC bolt mean?