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National Pipe Straight Mechanical (NPSM) Thread Ring Gages
Unit of Measure
1 2 

Item #

Item Name

Thread Size

Thread Type

External Thread 2A

Holder Number

List Price

1/8-27 NPSM Ring Go 2A N/A 0.3725 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/8-27 N/A National Pipe Straight Mechanical (NPSM) N/A 0.3725 in N/A 3 $318.00
1/8-27 NPSM Ring No Go Class 2A N/A 0.3689 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/8-27 N/A National Pipe Straight Mechanical (NPSM) N/A 0.3689 in N/A 3 $318.00
1/8-27 NPSM Ring No Go/Go Class 2A N/A 0.3689 to 0.3725 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/8-27 N/A National Pipe Straight Mechanical (NPSM) N/A 0.3689 to 0.3725 in N/A 3 $636.00
1/4-18 NPSM Ring Go 2A N/A 0.4903 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/4-18 N/A National Pipe Straight Mechanical (NPSM) N/A 0.4903 in N/A 4 $304.00
1/4-18 NPSM Ring No Go Class 2A N/A 0.4859 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/4-18 N/A National Pipe Straight Mechanical (NPSM) N/A 0.4859 in N/A 4 $304.00
1/4-18 NPSM Ring No Go/Go Class 2A N/A 0.4859 to 0.4903 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/4-18 N/A National Pipe Straight Mechanical (NPSM) N/A 0.4859 to 0.4903 in N/A 4 $608.00
3/8-18 NPSM Ring Go 2A N/A 0.6256 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 3/8-18 N/A National Pipe Straight Mechanical (NPSM) N/A 0.6256 in N/A 4 $315.00
3/8-18 NPSM Ring No Go Class 2A N/A 0.6211 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 3/8-18 N/A National Pipe Straight Mechanical (NPSM) N/A 0.6211 in N/A 4 $315.00
3/8-18 NPSM Ring No Go/Go Class 2A N/A 0.6211 to 0.6256 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 3/8-18 N/A National Pipe Straight Mechanical (NPSM) N/A 0.6211 to 0.6256 in N/A 4 $630.00
1/2-14 NPSM Ring Go 2A N/A 0.7769 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/2-14 N/A National Pipe Straight Mechanical (NPSM) N/A 0.7769 in N/A 5 $330.00
1/2-14 NPSM Ring No Go Class 2A N/A 0.7718 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/2-14 N/A National Pipe Straight Mechanical (NPSM) N/A 0.7718 in N/A 5 $330.00
1/2-14 NPSM Ring No Go/Go Class 2A N/A 0.7718 to 0.7769 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1/2-14 N/A National Pipe Straight Mechanical (NPSM) N/A 0.7718 to 0.7769 in N/A 5 $660.00
3/4-14 NPSM Ring Go 2A N/A 0.9873 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 3/4-14 N/A National Pipe Straight Mechanical (NPSM) N/A 0.9873 in N/A 5 $357.00
3/4-14 NPSM Ring No Go Class 2A N/A 0.9820 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 3/4-14 N/A National Pipe Straight Mechanical (NPSM) N/A 0.9820 in N/A 5 $357.00
3/4-14 NPSM Ring No Go/Go Class 2A N/A 0.9820 to 0.9873 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 3/4-14 N/A National Pipe Straight Mechanical (NPSM) N/A 0.9820 to 0.9873 in N/A 5 $714.00
1-11-1/2 NPSM Ring Go 2A N/A 1.2369 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.2369 in N/A 6 $372.00
1-11-1/2 NPSM Ring No Go Class 2A N/A 1.2311 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.2311 in N/A 6 $372.00
1-11-1/2 NPSM Ring No Go/Go Class 2A N/A 1.2311 to 1.2369 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.2311 to 1.2369 in N/A 6 $744.00
1-1/4-11-1/2 NPSM Ring Go 2A N/A 1.5816 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1-1/4 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.5816 in N/A $463.00
1-1/4-11-1/2 NPSM Ring No Go Class 2A N/A 1.5756 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1-1/4 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.5756 in N/A $463.00
1-1/4-11-1/2 NPSM Ring No Go/Go Class 2A N/A 1.5756 to 1.5816 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1-1/4 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.5756 to 1.5816 in N/A $926.00
1-1/2-11-1/2 NPSM Ring Go 2A N/A 1.8205 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1-1/2 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.8205 in N/A $481.00
1-1/2-11-1/2 NPSM Ring No Go Class 2A N/A 1.8144 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1-1/2 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.8144 in N/A $481.00
1-1/2-11-1/2 NPSM Ring No Go/Go Class 2A N/A 1.8144 to 1.8205 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 1-1/2 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 1.8144 to 1.8205 in N/A $962.00
2-11-1/2 NPSM Ring Go 2A N/A 2.2944 Inch (in) External 2A National Pipe Straight Mechanical (NPSM) Thread Ring Gage N/A 2 to 11-1/2 N/A National Pipe Straight Mechanical (NPSM) N/A 2.2944 in N/A $599.00
Unit of Measure
1 2