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Obsolete N-series (Rings) External Threads


SIZE
EXTERNAL (BOLT)
GO
CLASS 3A
2+3
NOGO (LO)
GO
CLASS 2A
NOGO
CLASS 2A
CLASS 3A
CLASS 2
CLASS 3
#0-80 NF, UNF
0.0519"
0.0506"
0.0502"
0.0506"
0.0514"
0.0496"
#1-64 NC, UNC
0.0629"
0.0614"
0.0610"
0.0615"
0.0623"
0.0603"
#1-72 NF, UNF
0.0640"
0.0626"
0.0622"
0.0627"
0.0634"
0.0615"
#2-56 NC, UNC
0.0744"
0.0728"
0.0724"
0.0729"
0.0738"
0.0717"
#2-64 NF, UNF
0.0759"
0.0744"
0.0740"
0.0745"
0.0753"
0.0733"
#3-48 NC, UNC
0.0855"
0.0838"
0.0833"
0.0839"
0.0848"
0.0825"
#3-56 NF, UNF
0.0874"
0.0858"
0.0854"
0.0859"
0.0867"
0.0845"
#4-40 NC, UNC
0.0958"
0.0939"
0.0934"
0.0941"
0.0950"
0.0925"
#4-48 NF, UNF
0.0985"
0.0967"
0.0963"
0.0969"
0.0978"
0.0954"
#5-40 NC, UNC
0.1088"
0.1069"
0.1064"
0.1071"
0.1080"
0.1054"
#5-44 NF, UNF
0.1102"
0.1083"
0.1079"
0.1086"
0.1095"
0.1070"
#6-32 NC, UNC
0.1177"
0.1156"
0.1150"
0.1158"
0.1169"
0.1141"
#6-40 NF, UNF
0.1218"
0.1198"
0.1194"
0.1201"
0.1210"
0.1184"
#8-32 NC, UNC
0.1437"
0.1415"
0.1410"
0.1418"
0.1428"
0.1399"
#8-36 NF, UNF
0.1460"
0.1439"
0.1435"
0.1442"
0.1452"
0.1424"
#10-24 NC, UNC
0.1629"
0.1604"
0.1596"
0.1605"
0.1619"
0.1586"
#10-32 NF, UNF
0.1697"
0.1674"
0.1670"
0.1678"
0.1688"
0.1658"
#12-24 NC, UNC
0.1889"
0.1863"
0.1856"
0.1865"
0.1879"
0.1845"
#12-28 NF, UNF
0.1928"
0.1904"
0.1897"
0.1906"
0.1918"
0.1886"
#12-32 NEF, UNEF
0.1957"
0.1933"
0.1926"
0.1935"
0.1948"
0.1917"
1/4"-20 NC, UNC
0.2175"
0.2147"
0.2139"
0.2149"
0.2164"
0.2127"
1/4"-28 NF, UNF
0.2268"
0.2243"
0.2237"
0.2246"
0.2258"
0.2225"
1/4"-32 NEF, UNEF
0.2297"
0.2273"
0.2265"
0.2275"
0.2287"
0.2255"
5/16"-18 NC, UNC
0.2764"
0.2734"
0.2723"
0.2734"
0.2752"
0.2712"
5/16"-24 NF, UNF
0.2854"
0.2827"
0.2821"
0.2830"
0.2843"
0.2806"
5/16"-32 NEF, UNEF
0.2922"
0.2898"
0.2889"
0.2899"
0.2912"
0.2880"
3/8"-16 NC, UNC
0.3344"
0.3311"
0.3299"
0.3312"
0.3331"
0.3287"
3/8"-24 NF, UNF
0.3479"
0.3450"
0.3446"
0.3455"
0.3468"
0.3430"
3/8"-32 NEF, UNEF
0.3547"
0.3522"
0.3513"
0.3523"
0.3537"
0.3503"
7/16"-14 NC, UNC
0.3911"
0.3876"
0.3862"
0.3875"
0.3897"
0.3850"
7/16"-20 NF, UNF
0.4050"
0.4019"
0.4014"
0.4024"
0.4037"
0.3995"
7/16"-28 NEF, UNEF
0.4143"
0.4116"
0.4107"
0.4118"
0.4132"
0.4096"
1/2"-13 NC, UNC
0.4500"
0.4463"
0.4448"
0.4463"
0.4485"
0.4435"
1/2"-20 NF, UNF
0.4675"
0.4643"
0.4639"
0.4649"
0.4662"
0.4619"
1/2"-28 NEF, UNEF
0.4768"
0.4740"
0.4731"
0.4742"
0.4757"
0.4720"
9/16"-12 NC, UNC
0.5084"
0.5045"
0.5028"
0.5044"
0.5068"
0.5016"
9/16"-18 NF, UNF
0.5264"
0.5230"
0.5223"
0.5234"
0.5250"
0.5205"
9/16"-24 NEF, UNEF
0.5354"
0.5325"
0.5314"
0.5326"
0.5342"
0.5303"
5/8"-11 NC, UNC
0.5660"
0.5619"
0.5601"
0.5618"
0.5644"
0.5589"
5/8"-18 NF, UNF
0.5889"
0.5854"
0.5848"
0.5859"
0.5875"
0.5828"
5/8"-24 NEF, UNEF
0.5979"
0.5949"
0.5938"
0.5950"
0.5967"
0.5927"
11/16"-24 NEF, UNEF
0.6604"
0.6574"
0.6563"
0.6575"
0.6592"
0.6552"
3/4"-10 NC, UNC
0.6850"
0.6806"
0.6786"
0.6805"
0.6832"
0.6773"
3/4"-16 NF, UNF
0.7094"
0.7058"
0.7049"
0.7062"
0.7079"
0.7029"
3/4"-20 NEF, UNEF
0.7175"
0.7142"
0.7129"
0.7143"
0.7162"
0.7118"
13/16"-20 NEF, UNEF
0.7800"
0.7767"
0.7754"
0.7768"
0.7787"
0.7743"
7/8"-9 NC, UNC
0.8028"
0.7981"
0.7958"
0.7979"
0.8009"
0.7946"
7/8"-14 NF, UNF
0.8286"
0.8245"
0.8237"
0.8250"
0.8270"
0.8216"
7/8"-20 NEF, UNEF
0.8425"
0.8392"
0.8378"
0.8392"
0.8412"
0.8368"
15/16"-20 NEF, UNEF
0.9050"
0.9016"
0.9003"
0.9017"
0.9036"
0.8991"
1"-8 NC, UNC
0.9188"
0.9137"
0.9112"
0.9134"
0.9168"
0.9100"
1"-12 NF, UNF
0.9459"
0.9415"
0.9403"
0.9419"
0.9441"
0.9382"
1"-14 NS, UNS
0.9536"
0.9494"
0.9487"
0.9500"
0.9519"
0.9463"
1"-20 NEF, UNEF
0.9675"
0.9641"
0.9627"
0.9641"
0.9651"
0.9616"
1-1/16"-12 N, UN
1.0084"
1.0042"
1.0028"
1.0044"
1.0067"
1.0010"
1-1/16"-18 NEF, UNEF
1.0254"
1.0228"
1.0213"
1.0228"
1.0250"
1.0203"
1-1/8"-7 NC, UNC
1.0322"
1.0268"
1.0237"
1.0263"
1.0300"
1.0228"
1-1/8"-12 NF, UNF
1.0709"
1.0664"
1.0653"
1.0669"
1.0691"
1.0631"
1-1/8"-18 NEF, UNEF
1.0889"
1.0853"
1.0837"
1.0853"
1.0875"
1.0828"
1-3/16"-18 NEF, UNEF
1.1514"
1.1478"
1.1462"
1.1478"
1.1499"
1.1450"
1-1/4"-7 NC, UNC
1.1572"
1.1517"
1.1487"
1.1513"
1.1550"
1.1476"
1-1/4"-12 NF, UNF
1.1959"
1.1913"
1.1903"
1.1919"
1.1941"
1.1879"
1-1/4"-18 NEF, UNEF
1.2139"
1.2103"
1.2086"
1.2102"
1.2124"
1.2075"
1-5/16"-12 N, UN
1.2584"
1.2541"
1.2528
1.2544"
1.2567"
1.2509"
1-5/16"-18 NEF, UNEF
1.2764"
1.2728"
1.2711"
1.2757"
1.2749"
1.2700"
1-3/8"-6 NC, UNC
1.2667"
1.2607"
1.2566"
1.2596"
1.2643"
1.2563"
1-3/8"-12 NF, UNF
1.3209"
1.3162"
1.3153"
1.3169"
1.3190"
1.3127"
1-3/8"-18 NEF, UNEF
1.3389"
1.3353"
1.3335"
1.3351"
1.3374"
1.3325"
1-7/16"-12 N, UN
1.3834"
1.3790"
1.3778"
1.3794"
1.3816"
1.3757"
1-7/16"-18 NEF, UNEF
1.4014"
1.3977"
1.3960"
1.3976"
1.3999"
1.3949"
1-1/2"-6 NC, UNC
1.3917"
1.3856"
1.3816"
1.3846"
1.3893"
1.3812"
1-1/2"-12 NF, UNF
1.4459"
1.4411"
1.4403"
1.4419"
1.4440"
1.4376"
1-1/2"-18 NEF, UNEF
1.4639"
1.4602"
1.4584"
1.4601"
1.4624"
1.4574"

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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