Precision Thread Gages

Gage Assembly offers high quality, specialty gages and threads that are manufactured with precision and accuracy.

For over 65 years, we’ve been a trusted gage manufacturer because of our professionalism and integrity. We provide customers with quality manufacturing services that meet their needs, often with short lead times.

Our engineered plant, gage lab and technical expertise enable us to consistently manufacture highly accurate gages. Our state of the art manufacturing equipment includes the latest CNC and conventional Internal and External High Precision thread grinding machines. This allows for skilled fabrication during the manufacturing process. Fine tool steels and advanced calibrated inspection equipment combine to provide our customers with reliable, superior wear gages. Along with extended performance, Gage Assembly manufactures competitively priced special thread gages for our customers.

Gage Assembly’s reputation as one of the industry’s highest caliber gage manufacturers is well-earned. As a member of the National Association of Manufacturers, we’ve provided threaded components for some of the world’s most demanding industries. Our specialty thread gages and ring gages have been used to check parts used in space exploration and satellite technology. We also provide quality assurance for a wide range of manufacturing processes worldwide.

Gage Assembly’s highly-skilled professionals, combined with our state of the art technology, allow us to manufacture custom thread gages based on the needs of each customer. Our successful experience over the last six decades is why our customers trust us. Our quality thread plugs and rings are manufactured with accuracy and precision.

Contact Us today and we’ll be happy to discuss a gage manufacturing solution that will meet your requirements.

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ANSI thread series designation

Designations Thread Series Reference
UN, UNC, UNF UNEF, UNS Unified Inch Screw Threads (UN and UNR Form) B1.1
Gages & Gaging for United Inch Screw Threads B1.2
UNJ, UNJC, UNJF, UNJEF, UNJS Unified Inch Screw Threads (UNJ Thread Form) B1.15
Screw Threads Gaging Systems for Dimensional Acceptability-inch and Metric Screw Threads (UN, UNR, UNJ, M and MJ) B1.3
NC-5 HF, NC-5CSF Class 5 Interference-Fit Thread B1.12
M Metric Screw Threads-M profile B1.13M
Gages and Gaging for Metric M Screw Threads B1.16M
MJ Metric Screw Threads-MJ Profile B1.21M
Gages and Gaging for MJ Series Metric Screw Threads B1.22M
UNM Unified Minature Screw Threads B1.10M
NPT Pipe Threads, General Purpose B1.20.1
NPTF, PTF-SAE Short Dryseal Pipe Threads B1.20.3
Gaging for Dryseal pipe Threads B1.20.5
ANPT Pipe Threads, Taper Aeronautical National Form
Symbol ANPT Design and Inspection Standard
SAE AS71051
NPSM American Standard Straight Pipe Threads for free-Fitting
Mechanical Joints for Fixtures
NPSL American Standard Straight Pipe Threads for Loose-Fitting
Mechanical Joints with Locknut
NPSC American Standard Straight Pipe Threads in pipe Couplings B1.20.1
NPSF Dryseal American Fuel Internal Straight Pipe Threads B1.20.3
NPSI Dryseal American Intermediate Internal Straight Pipe Threads B1.20.3
NH, NPSH, NHR Hose Coupling Screw Threads B1.20.7
NH Fire Hose Connections NFPA 1963
NGT, SGT National Gas Taper Threads H28/9A
NGO National Gas Outlet Threads H28/9A
NGS National Gas Straight Threads H28/9A
R, Rc, Rp (BSPT) British Taper Pipe Threads & Gages (BS-21 obsolete) ISO 7/2
G (BSPP) British Straight Pipe Threads & Gages (BS2779 obsolete) ISO 228-2
BSW, BSF British Parallel Screw Threads of Whitworth Form BS84
BA British Screw Threads BS 57
ACME Acme Screw Threads, General Purpose B1.5
ACME-C Acme Screw Threads, Centralizing B1.5
STUB ACME Stub Acme Screw Threads B1.8
BUTT Buttress inch Screw threads 7°/45° B1.9
ANSI/AMO Microscope Objective Threads B1.12
AWWA Underground Service line Valves and Fittings C800-84
DIN German Specifications
JIS Japanese Industrial Standard
ISO International Standard Organization
Notes: (1) All Threads, Except NGO, are Right Hand Unless Otherwise Designated. For NGO Threads, Designations RH or LH are required.