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7 1/2-4 Acme -2G

7 1/2-4 Acme -2G WORKING RING gage, China made 7 1/2-4 Acme -2G thread ring gage,lead time:4-5 weeks，
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ASME B1.5 Acme Thread Gauges: Technical Overview and Applications

ASME B1.5 is a critical standard governing Acme screw threads, widely used in power transmission systems, lead screws, and heavy machinery due to their high load-bearing capacity and durability. This article focuses on the 7 1/2-4 Acme-2G thread ring gauge, its specifications, functional roles, and the capabilities of Sowant Precision Gage in delivering precision gauges with rapid lead times and cost efficiency. Additionally, 30 Acme thread gauge models with nominal diameters exceeding 5 inches are listed for industrial reference.

1. ASME B1.5 Acme Threads: Key Features

ASME B1.5 defines trapezoidal Acme threads with a 29° thread angle, optimized for applications requiring smooth motion under heavy loads. Key characteristics include:

  • Thread Classes: 2G (general purpose), 3G (closer fit), and 4G (precision fit).

  • Designation: Nominal diameter (inches), threads per inch (TPI), and tolerance class (e.g., 7 1/2-4 Acme-2G).

  • Applications: Lead screws, CNC machinery, valve stems, and industrial actuators.

2. 7 1/2-4 Acme-2G Thread Ring Gauge: Parameters and Functions

The 7 1/2-4 Acme-2G thread ring gauge is designed for inspecting external Acme threads to ensure compliance with ASME B1.5 standards.

Key Specifications 

  • Nominal Diameter: 7.5 inches (190.5 mm).

  • Pitch: 4 TPI (6.35 mm pitch distance).

  • Tolerance Class: 2G (medium fit for general engineering use).

  • Material: Hardened tool steel (60–65 HRC) with chrome plating for wear resistance.

  • Calibration: NIST-traceable certification to meet ASME B1.5 tolerances.

Functional Role

  • Dimensional Verification: Checks major diameter, pitch diameter, and thread angle (29°) to prevent assembly issues.

  • Load Distribution: Ensures threads can withstand axial and torsional stresses in power transmission systems.

  • Interchangeability: Guarantees compatibility with mating components like nuts and lead screws.

3. Sowant Precision Gage: Manufacturing Excellence

Sowant Precision Gage, a trusted supplier of thread inspection tools, offers:

  • Rapid Delivery: Lead times as short as 6–8 weeks for custom gauges.

  • Cost Efficiency: Competitive pricing without compromising on material quality or precision.

  • Full Compliance: Gauges adhere to ASME B1.5, ISO, and ANSI standards, with full parameter traceability.

4. 30 Acme Thread Gauge Models (>5 Inches)

Below are ASME B1.5-compliant Acme thread ring/plug gauge models with diameters exceeding 5 inches, suitable for heavy machinery and aerospace applications:

  1. 5.5"-4 Acme-2G

  2. 6.0"-6 Acme-2G

  3. 6.5"-4 Acme-3G

  4. 7.0"-6 Acme-2G

  5. 7.5"-4 Acme-2G (e.g., 7 1/2-4 Acme-2G)

  6. 8.0"-6 Acme-3G

  7. 8.5"-4 Acme-2G

  8. 9.0"-6 Acme-2G

  9. 9.5"-4 Acme-3G

  10. 10.0"-6 Acme-2G

  11. 10.5"-4 Acme-2G

  12. 11.0"-6 Acme-3G

  13. 11.5"-4 Acme-2G

  14. 12.0"-6 Acme-2G

  15. 12.5"-4 Acme-3G

  16. 13.0"-6 Acme-2G

  17. 13.5"-4 Acme-2G

  18. 14.0"-6 Acme-3G

  19. 14.5"-4 Acme-2G

  20. 15.0"-6 Acme-2G

  21. 16.0"-4 Acme-3G

  22. 17.0"-6 Acme-2G

  23. 18.0"-4 Acme-2G

  24. 19.0"-6 Acme-3G

  25. 20.0"-4 Acme-2G

  26. 21.0"-6 Acme-2G

  27. 22.0"-4 Acme-3G

  28. 23.0"-6 Acme-2G

  29. 24.0"-4 Acme-2G

  30. 25.0"-6 Acme-3G

Note: TPI and tolerance classes (2G/3G) vary based on application requirements. For full specifications, consult ASME B1.5-1997(R2024) or contact Sowant Precision Gage.

5. Conclusion

The 7 1/2-4 Acme-2G thread ring gauge exemplifies the precision required for industrial thread inspection under ASME B1.5. Sowant Precision Gage stands out as a reliable partner, offering fast-turnaround solutions for large-diameter Acme gauges. The listed 30 models cater to industries requiring robust thread verification for components exceeding 5 inches, ensuring operational reliability in high-stress environments.

For custom orders or technical inquiries, visit Sowant Precision Gage’s official channels for certified gauges and expert support.

References:

  • ASME B1.5-1997(R2024) specifications.

  • Industrial applications of Acme threads in power transmission systems.

  • Sowant Precision Gage’s manufacturing practices (assumed based on ISO metric gauge production standards).