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7/8-12 Stub Acme-2G

7/8-12 Stub Acme-2G work plug gage per ASME B1.8 made in China, Sowant Precision Gage have large stock of Acme and stub acme thread ring and plug gages.
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Introduction to Stub Acme Threads and Gauges

Stub Acme threads, standardized under ASME B1.8, are a specialized type of trapezoidal thread widely used in heavy-duty mechanical systems requiring shallow thread depth and robust load-bearing capabilities. These threads are distinct from standard Acme threads due to their reduced thread height (stub design), 29° thread angle, and applications in high-stress environments such as oilfield equipment, aerospace actuators, and industrial machinery247. This article explores the specifications of Stub Acme threads, details the 7/8-12 Stub Acme-2G thread gauges manufactured by Sowant Precision Gage, and provides a list of 30 Stub Acme thread gauge models with diameters exceeding 3 inches.

1. Stub Acme Threads: Key Features and Standards

Design and Applications

  • Thread Angle: 29° (compared to 30° for DIN trapezoidal threads).

  • Shallow Depth: Optimized for applications where reduced material removal is critical, such as thin-walled components or high-strength alloys.

  • Standardization: Governed by ASME B1.8, which defines dimensions, tolerances, and inspection methods. The latest revision is ASME B1.8-1988(R2021).

  • Applications:

    • Oil and gas drilling tools (e.g., downhole completions).

    • Linear motion systems (e.g., jackscrews, actuators).

    • Heavy machinery requiring high torque transmission.

Thread Designation

A Stub Acme thread is designated by:

  • Nominal Diameter: In inches (e.g., 7/8").

  • Threads Per Inch (TPI): Indicates pitch (e.g., 12 TPI = 25.4/12 ≈ 2.117 mm).

  • Tolerance Class: "2G" denotes a medium-fit tolerance for general engineering use.

2. 7/8-12 Stub Acme-2G Thread Gauges by Sowant Precision Gage

Sowant Precision Gage specializes in manufacturing precision thread gauges compliant with ASME B1.8. The 7/8-12 Stub Acme-2G gauges are critical for verifying internal (ring gauge) and external (plug gauge) threads.

Key Parameters

  • Nominal Diameter: 7/8" (22.225 mm).

  • Pitch: 12 TPI (2.117 mm).

  • Tolerance Class: 2G (medium fit for general-purpose applications).

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

  • Certification: NIST-traceable calibration and compliance with ASME B1.8.

Functional Role

  • Ring Gauges: Inspect external threads for pitch diameter, flank angle, and taper.

  • Plug Gauges: Validate internal threads to ensure proper load distribution and thread engagement.

  • Quality Assurance: Prevent thread stripping or misalignment in high-torque systems like hydraulic presses or oilfield valves.

3. 30 Stub Acme Thread Gauge Models (>3 Inches)

The following list includes ASME B1.8-compliant Stub Acme thread gauges with diameters exceeding 3 inches, suitable for industrial applications:

  1. 3.0"-4 Stub Acme-2G

  2. 3.5"-6 Stub Acme-2G

  3. 4.0"-5 Stub Acme-2G

  4. 4.5"-4 Stub Acme-3G

  5. 5.0"-6 Stub Acme-2G

  6. 3.25"-8 Stub Acme-2G

  7. 4.25"-5 Stub Acme-3G

  8. 5.5"-4 Stub Acme-2G

  9. 6.0"-6 Stub Acme-2G

  10. 3.75"-10 Stub Acme-2G

  11. 4.0"-8 Stub Acme-3G

  12. 5.0"-5 Stub Acme-2G

  13. 3.0"-6 Stub Acme-3G

  14. 4.5"-6 Stub Acme-2G

  15. 6.5"-4 Stub Acme-2G

  16. 3.5"-8 Stub Acme-2G

  17. 5.5"-5 Stub Acme-3G

  18. 4.0"-10 Stub Acme-2G

  19. 3.25"-4 Stub Acme-2G

  20. 6.0"-5 Stub Acme-2G

  21. 3.75"-6 Stub Acme-3G

  22. 4.25"-8 Stub Acme-2G

  23. 5.0"-8 Stub Acme-2G

  24. 3.0"-5 Stub Acme-2G

  25. 5.5"-6 Stub Acme-3G

  26. 4.5"-5 Stub Acme-2G

  27. 6.5"-6 Stub Acme-2G

  28. 3.5"-10 Stub Acme-2G

  29. 4.0"-12 Stub Acme-3G

  30. 5.0"-10 Stub Acme-2G

Note: Tolerance classes (e.g., 2G, 3G) vary based on application requirements. For full specifications, consult ASME B1.8-1988 or contact Sowant Precision Gage.

4. Conclusion

Stub Acme threads and their corresponding gauges are indispensable in industries demanding high mechanical strength and precision. Sowant Precision Gage offers reliable solutions like the 7/8-12 Stub Acme-2G gauges, ensuring compliance with ASME standards and rapid delivery for critical projects. The listed 30 models cater to large-scale applications, reinforcing the versatility of Stub Acme threads in modern engineering.

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

References:

  • ASME B1.8-1988 specifications.

  • Stub Acme thread applications in oilfield and aerospace systems.

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