1/4-28 UNF 2A ring gauge GO&NOGO US$73

1/4-28 UNF 2A ring gauge GO&NOGO with long form calibration certificate US$113

1/4″-28 UNF 2B plug gauge GO&NOGO US$44

1/4-28 UNF 2B plug gauge GO&NOGO with long form calibration certificate US$84

Fraction: 1/4

Decimal:0.25

TPI:28

Thread Form: UNF

Ring gauges class of fit: 2A 3A

Plug gauges class of fit:2B 3B

1/4″-28 UNF ring plug gage in stock, can be sent out same day!

RH=right hand  LH=left hand both available

• • screw plug gage : taperlock double end with handle

• UNF screw ring gage : solid

Each gage 100% calibrated with quality assurance.

1/4-28 UNF  2B plug GO Pitch diameter: 0.2268″

2B plug  NOGO pitch diameter: 0.2311″

1/4-28 UNF  2A ring GO Pitch diameter: 0.2258″

2A ring  NOGO pitch diameter: 0.2225″

UNF thread gauge calibration certificate

If needed, one long form calibration certificate from professional third party testing lab accredited to ISO/IEC 17025 can be supplied. gaugesools also can provide UKAS certifications if needed.These calibration certificates need extra cost, if clients need them,please tell in advance.

Custom production

If clients need some special 1/4″-28 UNF thread gauges, then our custom production service can be provided. Usually plug gauges need ten days to finish, ring gages need two weeks to finish. the 3A, 3B class of fit  need custom production.

About us

gaugestools is a professional manufacturer and supplier of thread ring gages and thread plug gauges,including GO/NOGO, RH/LH(right hand and left hand).We have rich ranges of thread gauges, including UN, Metric, ACME, stub-ACME,BSPP, BSPT, NPT, NPTF, Trapezoidal, and Whitworth etc.

Worldwide shipment，usually taking 3-4 days clients can receive goods.  The pictures are just for reference. As too many items in stock,we haven’t taken pictures one by one.

We are committed to providing superior quality with excellent service in short delivery time, We aim to build long-term customer relationships.

How to use 1/4-28 UNF ring plug gauge

• GO of thread plug gage : it controls workpiece’s internal thread’s pitch diameter and major diameter’s maximum physical size. plug gage’s GO end should be screwed into the entire length of internal thread of workpiece, otherwise, the workpiece’s internal thread is unqualified.
• NOGO of thread plug gage: it controls workpiece’s internal thread’s single pitch diameter’s minimum physical size. plug gage’s NOGO can be screwed in, but it can’t be screwed in more than three turns. Otherwise, the internal thread is unqualified.
• GO of thread ring gage: it controls workpiece’s external thread’s pitch diameter and minor diameter’s maximum physical size. ring gage’s GO end should be screwed into the entire length of external thread of workpiece, otherwise, the workpiece’s external thread is unqualified.
• NOGO of thread ring gage: it controls workpiece’s external thread’s single pitch diameter’s minimum physical size. ring gage’s NOGO can be screwed in, but it can’t be screwed in more than three turns. Otherwise, the external thread is unqualified.

Check the full range of UNF thread gage in stock

payment

We accept payment of T/T(bank transfer), Paypal, Credit Cards, and West Union etc.