1-3/8"-8 RH UN Thread Gages

Please choose your Thread Gage Variant Carefully - Descriptions are below. Feel free to reach out with questions!

Vermont Gage's thread gaging products inspect the pitch diameter and the functional thread for both internal and external threaded products. All Thread Gages are made to class X tolerances in the USA!

• All stocked gages are produced to class X tolerances for ASME B1.2 (UN), ASME B18.29.1 (STI), and ASME B1.16M (Metric)
• All gages are supplied with a NIST traceable certificate of accuracy.
• Work Plugs available in class 2B, 3B, or 6H
• Rings and Set Plus are available in 2A, 3A, and 6g class
• Work Plugs, Reversibles and STI gages are made of hardened tool steel and chrome plated with a surface hardness of 70-72 HRc
• Ring gages and Setting Plugs are supplied as 60-62 HRc tool steel
• Handles are laser etched with thread information - OPTIONAL 1 line (25 characters) may be laser etched at no additional cost upon request!
• Imperial handles are light blue, and Metric are yellow
• Thread Ring holders are available upon request.
• Imperial, Metric, STI, Setting Plugs, Left Hand, and Pipe gages are all available as standard products. Please inquire if you do not see your thread, Vermont Gage may be able to offer you a custom solution!

Definitions:

Plug & Ring: Plugs are "male" gages used to check holes. Rings are "female" gages used to check shafts. So a Plug would be used to gage a tapped hole, and a Ring used to gage a bolt or threaded shaft.

Taperlock Plug: These are replaceable, male plug gages. The end which installs into your handle has a slight taper to press into the handle socket. These are the most popular choice for thread plug gages.

Reversible Plug: These replaceable, male plug gages are held in a collet style handle. When your gage shows wear or damage then it may be flipped in the collet. Similar in appearance to "all-thread" rods.

Trilock Plug: Another type of reversible plug gage are Trilock plugs. For large gages, these members are bolted onto the handle, and may also be reversed if one end shows wear.

Set Plug: These plugs are special purpose for simulating an external thread - NOT for inspecting tapped holes. Typical uses would include inspecting the set point of adjustable thread ring gages.

STI Plug: These plug gages are sized to inspect the pitch diameter of threaded holes intended for the installation of helical screw thread insert wires. 

Ring: Ring gages are intended to inspect external threaded shafts. 

Class: Imperial gages are available in two classes - #2 & #3 - which refer to the UN standard for their pitch diameter tolerances. Where a Class 3 thread has a tighter fit requirement than Class 2, where "B" refers to internal threads and "A" to external threads. Metric gages are only offered in Class 6H for internal and 6g for external.

Go / No-Go Members: Your gage is available in either a "Go", "No-Go", or a "Set" configuration. Where Go Members ONLY check that a thread meets it's minimum clearance of fit. A No-Go Member ONLY checks whether a thread exceeds it's maximum clearance of fit. Where a Set of both Members allows you to qualify a threads actual clearance lies between the two extremes (Passing Quality). For example, a tapped hole must allow the Go gage to screw in, but not allow the No-Go to enter.

Hand: The vast majority of all threads are "Right Handed" - meaning "Righty Tighty, Lefty Loosey"....  For some applications you may need "Left Handed" gages. We have these available in Plug, Ring, Imperial, and Metric styles.

Vermont Gage products are produced between their two domestic USA facilities in Vermont and Kentucky. Accredited by numerous quality management agencies, internal emphasis on continual improvement, and investment in direct NIST traceability ensures you can have confidence in the gages you purchase from us.

Vermont Gage offers many specials, and additional products available for quote. Please review the catalog for an extensive listing. But such products include carbide or chrome plated steel pins, hex gages, progressive step Go/No-Go pins, custom kitted inspection assortments, depth notching on gages, vent grooves, calibration services, and special long & large gages. Feel free to reach out directly to Progressive Metrology and we can supply all of these products & services to you.