Call: 781-331-3450

Email: Sales@lfoleary.com

5/16-18 UNC 

5/16-24 UNF

3/8-16 UNC

3/8-24 UNF

7/16-14 UNC

7/16-20 UNF

1/2-13 UNC

1/2-20 UNF

9/16-12 UNC

9/16-18 UNF

5/8-11 UNC

5/8-18 UNF

3/4-10 UNC

3/4-16 UNF

Helical Coil

Available in 2B and 3B


​2-56 UNC

3-48 UNC

3-56 UNF

4-40 UNC

4-48 UNF

​5-40 UNC

6-32 UNC 

6-40 UNF 

8-32 UNC

8-36 UNF

10-24 UNC

10-32 UNF

12-24 UNC

​1/4-20 UNC

1/4-28 UNF

Glastonbury Southern Gage

Helical Coil (STI) Thread Plug (available in Steel, Chrome, and Carbide)

Helical Coil (STI) Plug Gages are used to gage threaded holes prior to insertion of screw thread inserts. Screw thread inserts are used to repair a damaged thread or to provide a stronger threaded assembly.  Class X tolerance standard, Class W available.