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Thread Ring Gages

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Thread Ring Gages

  • Thread ring gages measure threads on an outside diameter (OD) to ensure the threads are within its designed tolerance limits
  • Thread ring gage is a one piece construction with a single setting adjustment feature
  • Thread ring gages are root relieved providing longer life and superior gaging accuracy
  • GO or NOGO members
  • Class 2A or 3A for inch
  • X tolerance, class 6g for metric
  • ASME/ANSI B1.2 and ANSI B1.16M compliant
  • Precision hand lapped and polished to ensure superior accuracy
  • Manufactured to the highest end of the ANSI specifications to ensure maximum wearability
  • Final inspection of gages is completed in an environmentally controlled ISO 17025 laboratory
  • Available in steel or chrome
  • Free NIST certificate of accuracy

Standard Pitch Diameter Chart - Inch

Standard Pitch Diameter Chart - Metric


Please select a measure:


Steel Chrome
Size Member Item # Price Sale Price Item # Price Sale Price
0-80 GO / NOGOSTR-01$149.00$135.00STRC-01Call
SETTRS-01$298.00$270.00TRC-01Call
1-64 GO / NOGOSTR-02$135.00$123.00STRC-02Call
SETTRS-02$271.00$245.00TRC-02Call
1-72 GO / NOGOSTR-03$135.00$123.00STRC-03Call
SETTRS-03$271.00$245.00TRC-03Call
2-56 GO / NOGOSTR-04$126.00$114.00STRC-04Call
SETTRS-04$252.00$228.00TRC-04Call
2-64 GO / NOGOSTR-05$126.00$114.00STRC-05Call
SETTRS-05$252.00$228.00TRC-05Call
3-48 GO / NOGOSTR-06$126.00$114.00STRC-06Call
SETTRS-06$252.00$228.00TRC-06Call
3-56 GO / NOGOSTR-07$126.00$114.00STRC-07Call
SETTRS-07$252.00$228.00TRC-07Call
4-40 GO / NOGOSTR-08$117.00$105.00STRC-08Call
SETTRS-08$233.00$211.00TRC-08Call
4-48 GO / NOGOSTR-09$117.00$105.00STRC-09Call
SETTRS-09$233.00$211.00TRC-09Call
5-40 GO / NOGOSTR-10$102.00$92.00STRC-10Call
SETTRS-10$204.00$184.00TRC-10Call
5-44 GO / NOGOSTR-11$102.00$92.00STRC-11Call
SETTRS-11$204.00$184.00TRC-11Call
6-32 GO / NOGOSTR-12$102.00$92.00STRC-12Call
SETTRS-12$204.00$184.00TRC-12Call
6-40 GO / NOGOSTR-13$102.00$92.00STRC-13Call
SETTRS-13$204.00$184.00TRC-13Call
8-32 GO / NOGOSTR-14$98.00$88.00STRC-14Call
SETTRS-14$195.00$177.00TRC-14Call
8-36 GO / NOGOSTR-15$98.00$88.00STRC-15Call
SETTRS-15$195.00$177.00TRC-15Call
10-24 GO / NOGOSTR-16$98.00$88.00STRC-16Call
SETTRS-16$195.00$177.00TRC-16Call
10-32 GO / NOGOSTR-17$98.00$88.00STRC-17Call
SETTRS-17$195.00$177.00TRC-17Call
12-24 GO / NOGOSTR-18$98.00$88.00STRC-18$146.00$132.00
SETTRS-18$195.00$177.00TRC-18$292.00$264.00
12-28 GO / NOGOSTR-19$98.00$88.00STRC-19$146.00$132.00
SETTRS-19$195.00$177.00TRC-19$292.00$264.00
12-32 GO / NOGOSTR-20$124.00$112.00STRC-20$148.00$134.00
SETTRS-20$248.00$224.00TRC-20$296.00$268.00
1/4-20 GO / NOGOSTR-21$99.00$89.00STRC-21$148.00$134.00
SETTRS-21$197.00$179.00TRC-21$296.00$268.00
1/4-28 GO / NOGOSTR-22$99.00$89.00STRC-22$148.00$134.00
SETTRS-22$197.00$179.00TRC-22$296.00$268.00
1/4-32 GO / NOGOSTR-23$124.00$112.00STRC-23$148.00$134.00
SETTRS-23$248.00$224.00TRC-23$296.00$268.00
5/6-18 GO / NOGOSTR-24$96.00$86.00STRC-24$142.00$128.00
SETTRS-24$191.00$173.00TRC-24$284.00$257.00
5/16-24 GO / NOGOSTR-25$96.00$86.00STRC-25$142.00$128.00
SETTRS-25$191.00$173.00TRC-25$284.00$257.00
5/16-32 GO / NOGOSTR-26$124.00$112.00STRC-26$148.00$134.00
SETTRS-26$248.00$224.00TRC-26$296.00$268.00
3/8-16 GO / NOGOSTR-27$106.00$96.00STRC-27$161.00$145.00
SETTRS-27$212.00$192.00TRC-27$321.00$291.00
3/8-24 GO / NOGOSTR-28$106.00$96.00STRC-28$161.00$145.00
SETTRS-28$212.00$192.00TRC-28$321.00$291.00
3/8-32 GO / NOGOSTR-29$129.00$117.00STRC-29$155.00$141.00
SETTRS-29$258.00$234.00TRC-29$311.00$281.00
7/16-14 GO / NOGOSTR-30$102.00$92.00STRC-30$152.00$138.00
SETTRS-30$204.00$184.00TRC-30$305.00$276.00
7/16-20 GO / NOGOSTR-31$102.00$92.00STRC-31$152.00$138.00
SETTRS-31$204.00$184.00TRC-31$305.00$276.00
7/16-28 GO / NOGOSTR-32$126.00$114.00STRC-32$155.00$141.00
SETTRS-32$252.00$228.00TRC-32$311.00$281.00
1/2-13 GO / NOGOSTR-33$106.00$96.00STRC-33$163.00$147.00
SETTRS-33$212.00$192.00TRC-33$326.00$295.00
1/2-20 GO / NOGOSTR-34$106.00$96.00STRC-34$163.00$147.00
SETTRS-34$212.00$192.00TRC-34$326.00$295.00
1/2-28 GO / NOGOSTR-35$130.00$118.00STRC-35$175.00$159.00
SETTRS-35$260.00$236.00TRC-35$351.00$317.00
9/16-12 GO / NOGOSTR-36$124.00$112.00STRC-36$185.00$167.00
SETTRS-36$248.00$224.00TRC-36$370.00$334.00
9/16-18 GO / NOGOSTR-37$124.00$112.00STRC-37$185.00$167.00
SETTRS-37$248.00$224.00TRC-37$370.00$334.00
9/16-24 GO / NOGOSTR-38$129.00$117.00STRC-38$185.00$167.00
SETTRS-38$258.00$234.00TRC-38$370.00$334.00
5/8-11 GO / NOGOSTR-39$124.00$112.00STRC-39$185.00$167.00
SETTRS-39$248.00$224.00TRC-39$370.00$334.00
5/8-18 GO / NOGOSTR-40$124.00$112.00STRC-40$185.00$167.00
SETTRS-40$248.00$224.00TRC-40$370.00$334.00
5/8-24 GO / NOGOSTR-41$171.00$155.00STRC-41$208.00$188.00
SETTRS-41$342.00$310.00TRC-41$416.00$376.00
11/16-24 GO / NOGOSTR-42$138.00$124.00STRC-42$208.00$188.00
SETTRS-42$275.00$249.00TRC-42$416.00$376.00
3/4-10 GO / NOGOSTR-43$152.00$138.00STRC-43$229.00$207.00
SETTRS-43$305.00$276.00TRC-43$458.00$414.00
3/4-16 GO / NOGOSTR-44$152.00$138.00STRC-44$229.00$207.00
SETTRS-44$305.00$276.00TRC-44$458.00$414.00
3/4-20 GO / NOGOSTR-45$187.00$169.00STRC-45$281.00$255.00
SETTRS-45$374.00$338.00TRC-45$563.00$509.00
13/16-20 GO / NOGOSTR-46$190.00$172.00STRC-46$287.00$259.00
SETTRS-46$380.00$344.00TRC-46$573.00$519.00
7/8-9 GO / NOGOSTR-47$164.00$148.00STRC-47$245.00$221.00
SETTRS-47$328.00$296.00TRC-47$489.00$443.00
7/8-14 GO / NOGOSTR-48$164.00$148.00STRC-48$245.00$221.00
SETTRS-48$328.00$296.00TRC-48$489.00$443.00
7/8-20 GO / NOGOSTR-49$197.00$179.00STRC-49$296.00$268.00
SETTRS-49$395.00$357.00TRC-49$592.00$536.00
15/16-20 GO / NOGOSTR-50$197.00$179.00STRC-50$296.00$268.00
SETTRS-50$395.00$357.00TRC-50$592.00$536.00
1-8 GO / NOGOSTR-51$202.00$182.00STRC-51$307.00$277.00
SETTRS-51$403.00$365.00TRC-51$613.00$555.00
1-12 GO / NOGOSTR-52$202.00$182.00STRC-52$307.00$277.00
SETTRS-52$403.00$365.00TRC-52$613.00$555.00
1-14 GO / NOGOSTR-53$202.00$182.00STRC-53$307.00$277.00
SETTRS-53$403.00$365.00TRC-53$613.00$555.00
1-20 GO / NOGOSTR-54$229.00$207.00STRC-54$343.00$311.00
SETTRS-54$458.00$414.00TRC-54$687.00$621.00
1 1/16-18 GO / NOGOSTR-55$257.00$233.00STRC-55$343.00$311.00
SETTRS-55$515.00$466.00TRC-55$687.00$621.00
1 1/8-7 GO / NOGOSTR-56$260.00$236.00STRC-56$382.00$346.00
SETTRS-56$521.00$471.00TRC-56$764.00$692.00
1 1/8-12 GO / NOGOSTR-57$260.00$236.00STRC-57$390.00$352.00
SETTRS-57$521.00$471.00TRC-57$779.00$705.00
1 1/8-18 GO / NOGOSTR-58$265.00$239.00STRC-58$390.00$352.00
SETTRS-58$529.00$479.00TRC-58$779.00$705.00
1 3/16-18 GO / NOGOSTR-59$271.00$245.00STRC-59$396.00$358.00
SETTRS-59$542.00$490.00TRC-59$792.00$716.00
1 1/4-7 GO / NOGOSTR-60$268.00$242.00STRC-60$407.00$369.00
SETTRS-60$536.00$485.00TRC-60$815.00$737.00
1 1/4-12 GO / NOGOSTR-61$268.00$242.00STRC-61$407.00$369.00
SETTRS-61$536.00$485.00TRC-61$815.00$737.00
1 1/4-18 GO / NOGOSTR-62$273.00$247.00STRC-62$404.00$366.00
SETTRS-62$546.00$494.00TRC-62$809.00$732.00
1 5/16-12 GO / NOGOSTR-63$277.00$251.00STRC-63$404.00$366.00
SETTRS-63$554.00$502.00TRC-63$809.00$732.00
1 3/8-6 GO / NOGOSTR-64$279.00$253.00STRC-64$413.00$373.00
SETTRS-64$559.00$505.00TRC-64$825.00$747.00
1 3/8-12 GO / NOGOSTR-65$275.00$249.00STRC-65$416.00$376.00
SETTRS-65$550.00$498.00TRC-65$832.00$752.00
1 3/8-18 GO / NOGOSTR-66$292.00$264.00STRC-66$418.00$378.00
SETTRS-66$584.00$528.00TRC-66$836.00$756.00
1 7/16-18 GO / NOGOSTR-67$292.00$264.00STRC-67$414.00$374.00
SETTRS-67$584.00$528.00TRC-67$827.00$749.00
1 1/2-6 GO / NOGOSTR-68$296.00$268.00STRC-68$439.00$397.00
SETTRS-68$592.00$536.00TRC-68$878.00$794.00
1 1/2-12 GO / NOGOSTR-69$296.00$268.00STRC-69$439.00$397.00
SETTRS-69$592.00$536.00TRC-69$878.00$794.00
1 1/2-18 GO / NOGOSTR-70$314.00$284.00STRC-70$439.00$397.00
SETTRS-70$628.00$568.00TRC-70$878.00$794.00


Thread ring gage is adjustable and used to measure threads on an outside diameter (OD) to ensure the threads are within its designed tolerance limits. The thread ring gage is a one piece construction with a single setting adjustment feature, manufactured to an X tolerance and American Gage Design standards (AGD).

Thread ring gages are root relieved for longer life and more accurate gaging. They are manufactured with a root clearance in the major diameter which eliminates the possibility of interference from the full form section of the thread setting plug and major diameter of the part being gaged. This feature assures that the thread flanks are making proper contact.

Available in GO or NOGO, Class 2A or 3A for inch and to X Tolerance, Class 6g for metric. Class and tolerances conform to ASME/ANSI B1.2, ANSI B1.16M Gage Standard and/or H28 Handbook. All thread inserts are made of an oil hardening graphitic tool steel and are ring lapped and hand polished to ensure maximum wearability. Class W or UNJ threads quoted upon request. Adjustable ring gages are available in steel or chrome.

WESTport Manufactured Products. 24th Anniversary Servicing Industry Worldwide (1989-2013)