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UN Work Plugs
UN Rings
UN Set Plugs
Metric Work Plugs
Metric Rings
Metric Set Plugs
Obsolete N-series (Work Plugs) Internal Threads
PITCH DIAMETER LIMITS
(N VS. UN)

SIZE
INTERNAL (NUT)
BASIC
GO CLASS
2B+3B
2+3
NOGO (HI)
CLASS 2B
CLASS 3B
CLASS 2
CLASS 3
#0-80 NF, UNF
0.0519"
0.0542"
0.0536"
0.0536"
0.0532"
#1-64 NC, UNC
0.0629"
0.0655"
0.0648"
0.0648"
0.0643"
#1-72 NF, UNF
0.0640"
0.0665
0.0659"
0.0658"
0.0653"
#2-56 NC, UNC
0.0744"
0.0772"
0.0765"
0.0764"
0.0759"
#2-64 NF, UNF
0.0759"
0.0786"
0.0779"
0.0778"
0.0773"
#3-48 NC, UNC
0.0855"
0.0885"
0.0877"
0.0877"
0.0871"
#3-56 NF, UNF
0.0874"
0.0902"
0.0895"
0.0894"
0.0889"
#4-40 NC, UNC
0.0958"
0.0991"
0.0982"
0.0982"
0.0975"
#4-48 NF, UNF
0.0985"
0.1016"
0.1008"
0.1007"
0.1001"
#5-40 NC, UNC
0.1088"
0.1121"
0.1113"
0.1112"
0.1105"
#5-44 NF, UNF
0.1102"
0.1134"
0.1126"
0.1125"
0.1118"
#6-32 NC, UNC
0.1177"
0.1214"
0.1204"
0.1204"
0.1196"
#6-40 NF, UNF
0.1218"
0.1252"
0.1243"
0.1242"
0.1235"
#8-32 NC, UNC
0.1437"
0.1475"
0.1465"
0.1464"
0.1456"
#8-36 NF, UNF
0.1460"
0.1496"
0.1487"
0.1485"
0.1478"
#10-24 NC, UNC
0.1629"
0.1672"
0.1661"
0.1662"
0.1653"
#10-32 NF, UNF
0.1697"
0.1736"
0.1726"
0.1724"
0.1716"
#12-24 NC, UNC
0.1889"
0.1933"
0.1922"
0.1922"
0.1913"
#12-28 NF, UNF
0.1928"
0.1970"
0.1959"
0.1959"
0.1950"
#12-32 NEF, UNEF
0.1957"
0.1998"
0.1988"
0.1988"
0.1979"
1/4"-20 NC, UNC
0.2175"
0.2224"
0.2211"
0.2211"
0.2201"
1/4"-28 NF, UNF
0.2268"
0.2311"
0.2300"
0.2299"
0.2290"
1/4"-32 NEF, UNEF
0.2297"
0.2339"
0.2328"
0.2329"
0.2319"
5/16"-18 NC, UNC
0.2764"
0.2817"
0.2803"
0.2805"
0.2794"
5/16"-24 NF, UNF
0.2854"
0.2902"
0.2890"
0.2887"
0.2878"
5/16"-32 NEF, UNEF
0.2922"
0.2964"
0.2953"
0.2955"
0.2945"
3/8"-16 NC, UNC
0.3344"
0.3401"
0.3387"
0.3389"
0.3376"
3/8"-24 NF, UNF
0.3479"
0.3528"
0.3516"
0.3512"
0.3503"
3/8"-32 NEF, UNEF
0.3547"
0.3591"
0.3580"
0.3581"
0.3571"
7/16"-14 NC, UNC
0.3911"
0.3972"
0.3957"
0.3960"
0.3947"
7/16"-20 NF, UNF
0.4050"
0.4104"
0.4091"
0.4086"
0.4076"
7/16"-28 NEF, UNEF
0.4143"
0.4189"
0.4178"
0.4179"
0.4168"
1/2"-13 NC, UNC
0.4500"
0.4565"
0.4548"
0.4552"
0.4537"
1/2"-20 NF, UNF
0.4675"
0.4731"
0.4717"
0.4711"
0.4701"
1/2"-28 NEF, UNEF
0.4768"
0.4816"
0.4804"
0.4805"
0.4794"
9/16"-12 NC, UNC
0.5084"
0.5152"
0.5135"
0.5140"
0.5124"
9/16"-18 NF, UNF
0.5264"
0.5323"
0.5308"
0.5305"
0.5294"
9/16"-24 NEF, UNEF
0.5354"
0.5405"
0.5392"
0.5394"
0.5382"
5/8"-11 NC, UNC
0.5660"
0.5732"
0.5714"
0.5719"
0.5702"
5/8"-18 NF, UNF
0.5889"
0.5949"
0.5934"
0.5930"
0.5919"
5/8"-24 NEF, UNEF
0.5979"
0.6031"
0.6018"
0.6020"
0.6008"
11/16"-24 NEF, UNEF
0.6604"
0.6656"
0.6643"
0.6646"
0.6633"
3/4"-10 NC, UNC
0.6850"
0.6927"
0.6907"
0.6714"
0.6895"
3/4"-16 NF, UNF
0.7094"
0.7159"
0.7143"
0.7139"
0.7126"
3/4"-20 NEF, UNEF
0.7175"
0.7232"
0.7218"
0.7221"
0.7207"
13/16"-20 NEF, UNEF
0.7800"
0.7857"
0.7843"
0.7846"
0.7832"
7/8"-9 NC, UNC
0.8028"
0.8110"
0.8089"
0.8098"
0.8077"
7/8"-14 NF, UNF
0.8286"
0.8356"
0.8339"
0.8335"
0.8322"
7/8"-20 NEF, UNEF
0.8425"
0.8482"
0.8468"
0.8472"
0.8458"
15/16"-20 NEF, UNEF
0.9050"
0.9109"
0.9094"
0.9097"
0.9083"
1"-8 NC, UNC
0.9188"
0.9276"
0.9254"
0.9264"
0.9242"
1"-12 NF, UNF
0.9459"
0.9535"
0.9516"
0.9515"
0.9499"
1"-14 NS, UNS
0.9536"
0.9609"
0.9590"
0.9585"
0.9572"
1"-20 NEF, UNEF
0.9675"
0.9734"
0.9719"
0.9723"
0.9709"
1-1/16"-12 N, UN
1.0084"
1.0158"
1.0139"
1.0140"
1.0124"
1-1/16"-18 NEF, UNEF
1.0264"
1.0326"
1.0310"
1.0315"
1.0300"
1-1/8"-7 NC, UNC
1.0322"
1.0416"
1.0393"
1.0407"
1.0381"
1-1/8"-12 NF, UNF
1.0709"
1.0787"
1.0768"
1.0785"
1.0749"
1-1/8"-18 NEF, UNEF
1.0889"
1.0961"
1.0935"
1.0941"
1.0925"
1-3/16"-18 NEF, UNEF
1.1514"
1.1577"
1.1561"
1.1566"
1.1550"
1-1/4"-7 NC, UNC
1.1572"
1.1668"
1.1644"
1.1657"
1.1631"
1-1/4"-12 NF, UNF
1.1959"
1.2039"
1.2019"
1.2015"
1.9999"
1-1/4"-18 NEF, UNEF
1.2139"
1.2202"
1.2186"
1.2192"
1.2176"
1-5/16"-12 N, UN
1.2584"
1.2659"
1.2640"
1.2640"
1.2624"
1-5/16"-18 NEF, UNEF
1.2764"
1.2827"
1.2811"
1.2817"
1.2801"
1-3/8"-6 NC, UNC
1.2667"
1.2771"
1.2745"
1.2788"
1.2738"
1-3/8"-12 NF, UNF
1.3209"
1.3291"
1.3270"
1.3265"
1.3249"
1-3/8"-18 NEF, UNEF
1.3389"
1.3452"
1.3436"
1.3443"
1.3427"
1-7/16"-12 N, UN
1.3834"
1.3910"
1.3891"
1.3890"
1.3874"
1-7/16"-18 NEF, UNEF
1.4014"
1.4079"
1.4062"
1.4068"
1.4052"
1-1/2"-6 NC, UNC
1.3917"
1.4022"
1.3996"
1.4018"
1.3988"
1-1/2"-12 NF, UNF
1.4459"
1.4542"
1.4522"
1.4515"
1.4499"
1-1/2"-18 NEF, UNEF
1.4639"
1.4704"
1.4687"
1.4694"
1.4677"

Disclaimer:
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document which is a copyrighted document. To purchase a copy visit an Authorized Reseller.

Comments:
Original Posting: 7/14/2009
Last Revision: 2/27/2013
Error corrections in, or comments about, the above data can be sent to: gageguy@gagecrib.com

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