PITCH
DIAMETERS OF STRAIGHT PIPE PLUG & RING GAGES
PLUG
GAGES
RING
GAGES
SIZE
& PITCH
NPSI
NPSF
NPSC
NPSL
NPSM
- 2B
NPSM-2A
NPSL
1/16"-27
0.2791"
0.2768"
0.2826"
0.2803"
1/8"-27
0.3715"
0.3692"
0.3701"
0.3863"
0.3736"
0.3725"
0.3840"
0.3750"
0.3727"
0.3771"
0.3898"
0.3783"
0.3689"
0.3805"
1/4"-18
0.4886"
0.4852"
0.4864"
0.5073"
0.4916"
0.4903"
0.5038"
0.4938"
0.4904"
0.4968"
0.5125"
0.4974"
0.4859"
0.4986"
3/8"-18
0.6240"
0.6205"
0.6218"
0.6444"
0.6270"
0.6256"
0.6409"
0.6292"
0.6257"
0.6322"
0.6496"
0.6329"
0.6211"
0.6357"
1/2"-14
0.7745"
0.7700"
0.7717"
0.8008"
0.7784"
0.7769"
0.7963"
0.7812"
0.7767"
0.7851"
0.8075"
0.7851"
0.7718"
0.7896"
3/4"-14
0.9850"
0.9805"
0.9822"
1.0112"
0.9889"
0.9873"
1.0067"
0.9917"
0.9872"
0.9956"
1.0179"
0.9958"
0.9820"
1.0000"
1"-11-1/2
1.2338"
1.2284"
1.2305"
1.2658"
1.2386"
1.2369"
1.2604"
1.2420"
1.2365"
1.2468"
1.2739"
1.2462"
1.2311"
1.2523"
1-1/4"-11-1/2
1.5752"
1.6106"
1.5834"
1.5816"
1.6051"
1.5915"
1.6187"
1.5912"
1.5756"
1.5970"
1-1/2"-11-1/2
1.8142"
1.8495"
1.8223"
1.8205"
1.8441"
1.8305"
1.8576"
1.8302"
1.8144"
1.8360"
2"-11-1/2
2.2881"
2.3234"
2.2963"
2.2944"
2.3180"
2.3044"
2.3315"
2.3044"
2.2882"
2.3099"
2-1/2"-8
2.7504"
2.8012"
2.7622"
2.7600"
2.7934"
2.7739"
2.8129"
2.7720"
2.7528"
2.7817"
3"-8
3.3768"
3.3885"
3.3862"
3.4198"
3.4002"
3.3984"
3.3786"
3.4081"
COMMENTS
Original Posting: 8/17/2008
Last Revision: 10/16/2012
Error corrections in or comments about the above data can be sent to: office@gagecrib.com
Gage Crib Worldwide, Inc.
6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
Phone: 001-616-954-6581 • Fax: 001-616-954-6583 CONTACT FORMS & INFO
