Thread Plug and Ring Gages, Hardness Testing, Calibration and Special Taps and Dies at WESTport

WESTport is an OEM (Original Equipment Manufacturer) which provides us with preferred pricing for Precision Measuring Tools
not manufactured by WESTport. These special savings are passed directly along to our valued customers. We hope you will find
this added value service saves you time and money as your one stop shop for Quality Assurance Products and Services.

Precision Tool Specials

Gage Tip of the Month - How to use a Thread Plug Gage

GO Thread Plug Gage Member

The Go thread plug gage should pass completely across or into the product threads. Application of force to engage the Go
gage member with the product indicates the product is smaller than the minimum allowable size. If you force the Go gage to
engage with the product it will increase the size of the product making it acceptable but this wear the gage unnecessarily. The
result would be a sharp reduction in how long your Go thread gage will last.

NOGO Thread Plug Gage Member

INCH: Not more than three complete turns For inch threads, the NOGO should never go beyond the third thread or less if
modified.

METRIC: Definite drag before the second turn For metric threads the NOGO could theoretically go the full length but should
not be continued once the definite drag is felt. If the NOGO engages with the product more than the specified requirements
the product is smaller than the minimum acceptable size.

Note: Modification of the above requirements may be necessary when the product is thin having few complete threads or
when the product is of a material that may stretch or give.