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Southern Style Thread Ring Gages

The Southern Adjustable Style thread Ring Gage features an adjustment mechanism that maintains the roundness integrity of the gage throughout its use. The helix path of the thread along the line of adjustment remains true and in alignment throughout the life of the gage. Aluminum gage bodies anodized green for Go and red for NoGo provide easy identification. Precision ground thread inserts are made of oil hardened tool steel. Thread class and tolerances conform to ASME/ANSI B1.2 or B1.16M. Sizes below .2500 and M6 are counterbored to hold specific length.

Southern Style Thread Ring Gages


Blunt Starts, Higbee Cuts, and Depth Notches

Thread Check can add many custom features to our thread gages such as depth notches, blunt starts, blunt points or chamfers that are
beneficial for several applications including thread depth gaging and short or shallow threads

Blind Hole – A hole that goes partially through a part.


Blunt Point –The removal of a male center point from threads smaller than #6 (M4).
This does not allow the gage to be face ground to within .5P.
This is not a Blunt Start. See Convolution below.


Chamfer – An angle ground on the front of a gage that allows for easier assembly with the mating part


Convolution – Removal of the incomplete thread back to the first full thread. Also
known as a “Blunt Start” or “Higbee Cut” per ASME B1.7 – 2006


Depth Notch – Measure from the centerline of the first full thread to the flat step of the notch.
A depth notch is only used on a go plug gage and is used to measure thread depth.


Grind Face w/in .5P - A convoluted thread plugs face is ground back to the base of
the first full thread. This permits the gage to inspect a blind hole to the bottom of the thread.

Contact Thread Check Inc for more information

800 767 7633 or 631 231 1515