2- 12 12-UN : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more. External Threads. 2A, 3A. Internal Threads. 2B, 3B. 2 - 12 12-UN 2A (External) (UNC/UNF/UNEF) National Pipe (NPT) Dryseal Pipe (BPTF) British Pipe (BSP) ACME; Threading Glossary. UnifiedInch Thread Gages ; 3/8-24 UNF 2A Go Set Plug; 3/8-24 UNF 2A Go Set Plug. SKU. 3/8-24-TSP-2A GO. $107.00. Accessories. Taperlock Handle-2 + $13.00 . Calibration. Long Form + $20.00. Special Marking. Qty. Add to Cart. Add to Quote. This gage is used to calibrate a thread ring gage of the matching size. ThreadedRing Gauges. 3/8"-24. Certificate of Accuracy with NIST Traceability. These threaded ring gauges are used to check and inspect internal inch threads in Unified thread standards including Unified Coarse (UNC), Unified Fine (UNF), and others. Go or No-Go gauge members are available individually or as sets with both Go and No-Go ring gauges. 78 - 20 UNEF : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more 7/8 - 20 UNEF 2A (External) * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es: (UNC/UNF/UNEF) National Pipe (NPT) Dryseal Pipe (BPTF) British Pipe (BSP) ACME 38" - 24 unf: 0.375: 9.525: 8.50: 24: 1.058: 7/16" - 20 unf: 0.438: 11.112: 9.90: 20: 1.270: 1/2" - 20 unf: 0.500: 12.700: 11.50: 20: 1.270: 9/16" - 18 unf: 0.563: 14.288: 12.90: 18:

ThreadMajor diameter Thread per inch Pitch diameter Minor diameter male thread Minor diameter female thread; 13/16: 0.8125: 20: 0.7800: 0.7530: 0.7584: 7/8: 0.8750

303.5 2011/1 ISO INCH THREAD WITH A STANDARD UNF-2A TOLERANCE Ref. ASME B1.1 1989 Unified Inch Screw Threads Relationship between the tolerances mm to ins. / 25,4 Tolerance class ins. to mm x 25,4 2A is the foundation 1A = 1,500 x 2A 2A = 1,000 3A = 0,750 x 2A 1B = 1,950 x 2A 2B = 1,300 x 2A 3B = 0,975 x 2A Example :
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  • 3 8 24 unf 2a thread dimensions