Thread Gages

Thread Check Inc. manufactures a complete line of thread gages and related products. These gages are used to measure screw threads and calibrate gages. Thread Check offers thread plug gages and ring gagestapered pipe thread gagesstraight pipe thread gaugesAPI gages3-Wire thread measuring systems, tri roll thread comparators, British thread gaugesthread work plugs, and special thread gauges including Acme, buttress thread gauges, and custom thread gages.

All thread gages are AGD - American Gage Designed. All thread gauges are manufactured with gage blanks per ASME/ANSI B47.1. Thread Check Inc., uses tool steel which is oil –hardened, drawn, stabilized and redrawn to Rockwell C60-62. This material provides greater wear resistance, excellent anti-friction properties and rigid stability to distortion. Thread plug gages are available in reversible design, taperlock design, and trilock design.

For further assistance with selecting which thread gauge you need, please contact our knowledgeable sales engineering staff. 

Reversible Thread Plug Gages from Thread Check, Inc.

Reversible thread plug gages are available in thread sizes up to ¾ of an inch. The reversible thread plug gage style allows for one end of the gage to be rotated so the user gets two gages in one. A worn thread gage end can be turned around by simply opening the collet of the handle and turning the thread plug gage and bushing around so the opposite end essentially becomes a new gage. The reversible thread plug gage style is ideal in high volume inspection applications.

Reversible thread plug gages are manufactured to X tolerances in class 2B or 3B in inches and 6H in metric. All standard reversible thread plug gages are stocked in chrome coating which extends the wear life of the thread gauge by more than 100% thus providing dramatic savings in replacement costs.

Taperlock Thread Plug Gages

Taperlock thread plug gages are available in thread sizes up to 1 ½ inches in diameter. These thread plug gauges are less expensive than reversible thread plug gauges. Taperlock thread plug gauges are considered the most popular style. The taperlock thread plug gage allows for a quick and convenient replacement of the gage member. A worn thread gage can be simply removed and a new replacement thread gage inserted into the handle by press fitting.

Taperlock thread plug gages are manufactured to X tolerances in class 2B or 3B in inches and 6H in metric. All standard taperlock thread plug gages are stocked in chrome coating which extends the wear life of the thread gage by more than 100% thus providing dramatic savings in replacement costs.

Trilock Style Thread Plug Gauges

Trilock style thread plug gauges are available from 1 ½ inches up to 16.00 inches and larger. Trilock thread plug gages are reversible style so that both ends of the gages can be used. The gage member is fastened to the handle by a center bolt assembly. To reduce weight, single end thread plug gage assemblies are typically offered for diameters of 3.0 inches and larger.

Trilock thread plug gages are manufactured to X tolerances in class 2B or 3B in inches and 6H in metric. Each STI thread gauge is manufactured to a class X tolerance. Class W tolerance gages are priced on request.

Other Gauges from Thread Check, Inc.

Screw Thread Insert – STI thread plug gages, also referred to as helical coil thread 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 thread assembly.

Thread ring gages can be supplied in both American Gage Design adjustable style and solid style. Thread ring gages are manufactured to X tolerances in class 1A, 2A, and 3A for go members and 2A and 3A for no go members. Unified series thread ring gages are available in UNC, UNF, UNEF, and specials. Metric thread ring gages are commonly manufactured to class 6g as well as other class sizes e, f, and h.

Thread Set plug gages are used to calibrate thread ring gages. Thread set plug gages are manufactured to X tolerances in class 1A, 2A, and 3A for go members and 2A and 3A for no go members. Unified series thread set plug gages are available in UNC, UNF, UNEF, and specials. Metric thread set plug gages are commonly manufactured to class 6g as well as other class sizes e, f, and h.

For further assistance with selecting the correct thread gauge for your application please contact our knowledgeable sales engineering staff.