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1.4375-16UNJ-3A Thread Gauge

China made 1.4375-16UNJ-3A Thread Ring Gauge，Chinese UNJ go/no-go gage,sowant preicison gage can offer MIL-S-8879 thread gage.
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1. Introduction to MIL-S-8879 Thread Gage: 1.4375-16UNJ-3A

The 1.4375-16UNJ-3A thread ring gage complies with the MIL-S-8879 standard, designed for high-precision aerospace and military applications. This UNJ-series gage features a 3A tolerance class, ensuring tight dimensional control for external threads. The UNJ thread profile includes a rounded root (0.15011P to 0.18042P radius) to reduce stress concentration, enhancing fatigue resistance compared to standard UN threads.

2. 30 AS8879 Thread Gage Models

Below is a list of common AS8879-compliant thread gage models, covering various sizes and configurations:

  1. China made UNJ thread ring gauge 15/16-24UNJF-3A

  2. China made UNJ thread ring gauge 1 1/4-28UNJF-3A-LH

  3. China made UNJ thread ring gauge 1 3/8-24UNJF-3B

  4. China made UNJ thread ring gauge 1 1/2-20UNJC-3A

  5. China made UNJ thread ring gauge 1 5/8-18UNJ-3A

  6. China made UNJ thread ring gauge 1 3/4-16UNJEF-3A

  7. China made UNJ thread ring gauge 1 7/8-14UNJS-3B

  8. China made UNJ thread ring gauge 2-12UNJ-3A

  9. China made UNJ thread ring gauge 2-1/8-12UNJC-3A

  10. China made UNJ thread ring gauge 2-1/4-12UNJF-3B

  11. China made UNJ thread ring gauge 2 1/4-32UNJEF-3B

  12. China made UNJ thread ring gauge 2 5/16-18UNJC-3A

  13. China made UNJ thread ring gauge 2 7/16-20UNJF-3B

  14. China made UNJ thread ring gauge 2 9/16-18UNJ-3A

  15. China made UNJ thread ring gauge 2 3/4-10UNJS-3B

  16. China made UNJ thread ring gauge 3-8UNJ-3A

  17. China made UNJ thread ring gauge 2-1/2-12UNJC-3B

  18. China made UNJ thread ring gauge 2-4-1/2UNJEF-3A

  19. China made UNJ thread ring gauge 2 5/8-24UNJS-3B

  20. China made UNJ thread ring gauge 2 7/8-20UNJC-3A

  21. China made UNJ thread ring gauge 3-14UNJ-3B

Note: For complete specifications, refer to aerospace standards such as ASME B1.15 and MIL-S-8879.

3. Differences Between UN and UNJ Threads

  • Root Design: UN threads have a flat or slightly rounded root, while UNJ threads feature a fully rounded root (radius between 0.15011P and 0.18042P) to minimize stress concentration.

  • Minor Diameter: UNJ internal threads have a larger minor diameter compared to UN threads, reducing the risk of thread stripping.

  • Applications: UNJ threads are mandatory in aerospace and high-stress environments (e.g., MIL-S-8879 fasteners), whereas UN threads are used in general industrial applications.

4. Overview of MIL-S-8879 Standard

The MIL-S-8879 standard specifies modified Unified Threads (3A/3B classes) with enhanced root radii for improved fatigue resistance. Key features include:

  • Root Radius: 0.15011P to 0.18042P for external threads.

  • Increased Minor Diameter: Adjustments to accommodate the rounded root, ensuring compatibility with high-strength aerospace fasteners.

  • Mandatory Compliance: Required by U.S. Department of Defense agencies for critical applications.

5. Sowant Precision Gage Co., Ltd. Product Range

Sowant Precision Gage manufactures and distributes the following thread gages:

  • China made UNJ thread ring gauge HBPV Thread Gages (High-Pressure Vessel)

  • China made UNJ thread ring gauge Sharp Vee Thread Gages

  • China made UNJ thread ring gauge UN/UNJ Thread Gages

  • China made UNJ thread ring gauge TR (Trapezoidal) Thread Gages

  • China made UNJ thread ring gauge ACME Thread Gages

Additionally, they act as an authorized distributor for:

  • Gagemaker Thread Inspection Systems (e.g., PD-8001, LG-5002, MRP-5500)

  • Allen Gauge Products (API石油螺纹量规)

  • Mueller Gage Narrow-Groove Measurement Tools

6. Gagemaker Product Models

  1. PD-8001

  2. PD-6001

  3. LG-5002

  4. RG-7000

  5. PG-6000

  6. IT-6001

  7. TH-3000

  8. MRP-5500

  9. MRP-5000

  10. MRP-2500

  11. MRP-1500

  12. BX-1000

  13. BXG-1000

  14. PD-8000

  15. PD-6000

  16. IT-6000

  17. NC-REG-BCSG

  18. LTC-5000

  19. API-7-1

  20. TBG-UPTBG

  21. CSG-LCSG

  22. BCSG-2000

  23. LP-3000

  24. SP-4000

  25. HT-2500

  26. VK-700

  27. CTG-900

  28. FLS-800

  29. DIA-600

  30. TPI-550

 

7. Mueller Gage Models 

8. Conclusion

The MIL-S-8879 standard and UNJ thread gages are critical for aerospace and military applications, offering superior fatigue resistance. Sowant Precision Gage and its partners, including Gagemaker and Mueller Gage, provide comprehensive solutions for high-precision threading needs. For further details, consult the referenced standards and suppliers.