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Inch Thread Gage Pitch Diameters
(Sizes 1 3/8" Through 2 1/2")
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Thread Size
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Plug Gage
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Ring Gage
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1 3/8-6 UNC
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1.2667"
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1.2771"
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1.2745"
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1.2643"
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1.2563"
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1.2667"
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1.2607"
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1 3/8-8 UN
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1.2938"
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1.3031"
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1.3008"
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1.2916"
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1.2844"
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1.2938"
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1.2884"
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1 3/8-12 UNF
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1.3209"
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1.3291"
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1.3270"
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1.3190"
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1.3127"
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1.3209"
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1.3162"
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1 3/8-16 UN
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1.3344"
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1.3140"
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1.3394"
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1.3329"
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1.3278"
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1.3344"
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1.3306"
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1 3/8-18 UNEF
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1.3389"
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1.3452"
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1.3436"
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1.3374"
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1.3325"
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1.3389"
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1.3353"
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1 3/8-20 UN
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1.3425"
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1.3486"
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1.3470"
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1.3411"
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1.3364"
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1.3425"
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1.3390"
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1 3/8-28 UN
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1.3518"
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1.3571"
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1.3558"
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1.3506"
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1.3465"
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1.3518"
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1.3487"
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1 7/16-6 UN
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1.3292"
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1.3396"
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1.3370"
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1.3268"
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1.3188"
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1.3292"
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1.3232"
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1 7/16-8 UN
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1.3563"
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1.3657"
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1.3634"
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1.3541"
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1.3469"
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1.3563"
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1.3509"
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1 7/16-12 UN
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1.3834"
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1.3910"
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1.3891"
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1.3816"
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1.3757"
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1.3834"
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1.3790"
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1 7/16-16 UN
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1.3969"
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1.4037"
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1.4020"
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1.3953"
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1.3901"
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1.3969"
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1.3930"
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1 7/16-18 UNEF
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1.4014"
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1.4079"
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1.4062"
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1.3999"
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1.3949"
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1.4014"
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1.3977"
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1 7/16-20 UN
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1.4050"
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1.4112"
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1.4096"
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1.4036"
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1.3988"
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1.4050"
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1.4014"
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1 7/16-28 UN
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1.4143"
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1.4198"
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1.4184"
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1.4130"
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1.4088"
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1.4143"
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1.4112"
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1 1/2-6 UNC
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1.3917"
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1.4022"
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1.3996"
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1.3893"
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1.3812"
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1.3917"
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1.3856"
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1 1/2-8 UN
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1.4188"
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1.4283"
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1.4259"
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1.4166"
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1.4093"
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1.4188"
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1.4133"
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1 1/2-12 UNF
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1.4459"
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1.4542"
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1.4522"
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1.4440"
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1.4376"
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1.4459"
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1.4411"
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1 1/2-16 UN
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1.4594"
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1.4662"
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1.4645"
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1.4578"
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1.4526"
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1.4594"
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1.4555"
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1 1/2-18 UNEF
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1.4639"
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1.4704"
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1.4687"
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1.4624"
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1.4574"
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1.4639"
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1.4602"
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1 1/2-20 UN
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1.4675"
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1.4737"
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1.4721"
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1.4661"
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1.4613"
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1.4675"
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1.4639"
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1 1/2-28 UN
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1.4768"
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1.4823"
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1.4809"
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1.4755"
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1.4713"
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1.4768"
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1.4737"
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1 5/8-12 UN
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1.5709"
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1.5785"
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1.5766"
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1.5691"
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1.5632"
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1.5709"
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1.5665"
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1 3/4-12 UN
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1.6959"
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1.7037"
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1.7017"
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1.6941"
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1.6881"
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1.6959"
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1.6914"
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1 7/8-12 UN
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1.8209"
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1.8287"
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1.8267"
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1.8191"
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1.8131"
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1.8209"
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1.8164"
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2-12 UN
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1.9459"
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1.9538"
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1.9518"
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1.9441"
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1.9380"
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1.9459"
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1.9414"
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2 1/4-12 UN
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2.1959"
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2.2038"
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2.2018"
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2.1941"
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2.1880"
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2.1959"
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2.1914"
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2 1/2-12 UN
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2.4459"
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2.4540"
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2.4519"
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2.4440"
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2.4378"
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2.4459"
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2.4413"
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© 2007 Great Lakes Gage Sales, Inc.
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