4-4 STUB ACME-2G
China Thread gage manufactory Sowant Precision gage can offer you 4-4 STUB ACME-2G thread ring gages in 3 weeks.
A Comparative Analysis of ASME B1.8 Stub ACME Thread Gauges and ISO TR Thread Plug/Ring Gauges
1. Overview of Stub ACME (ASME B1.8) and ISO TR Threads
ASME B1.8 Stub ACME Threads
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Standard: Governed by ASME B1.8-1988 (revised 2021).
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Profile: 29° included angle, trapezoidal shape with shallow thread depth and coarser pitch.
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Purpose: Designed for high-strength applications in limited axial space (e.g., military, aerospace).
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Tolerance Classes: Typically 2G (General Purpose) for moderate clearance.
ISO TR Threads
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Standard: Follows ISO 2901-2904 for trapezoidal (TR) threads.
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Profile: 30° included angle, standardized trapezoidal form with metric or imperial pitch options.
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Purpose: General industrial use in power transmission and motion control (e.g., machine tools, actuators).
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Tolerance Classes: Defined by ISO standards (e.g., 7e, 8c for internal/external threads).
2. Key Similarities and Differences
| Aspect | ASME B1.8 Stub ACME | ISO TR |
|---|---|---|
| Thread Angle | 29° | 30° |
| Depth/Pitch Ratio | Shallower depth, coarser pitch for strength | Deeper depth, finer pitch for versatility |
| Standardization | ASME B1.8 (U.S.-centric) | ISO 2901-2904 (global metric/imperial) |
| Tolerance Designation | 2G, 3G (General/Centralizing) | 7e, 8c (ISO-specific tolerance grades) |
| Applications | High-stress, space-constrained systems | General machinery, European/global equipment |
Similarities:
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Both are trapezoidal threads for power transmission.
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Require precise gauging for thread quality control.
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Used in industrial automation, robotics, and heavy machinery.
3. Sowant Precision Gage’s Custom Manufacturing Capabilities
Sowant Precision Gage produces gauges compliant with ASME B1.8 and ISO TR standards, including:
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Stub ACME-2G Ring Gauges: For verifying external threads per ASME B1.8.
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ISO TR Plug/Ring Gauges: For inspecting ISO trapezoidal threads (metric or imperial).
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Customization: Adjustments to pitch, diameter, and tolerance classes based on client drawings.
4. Example: 4-4 STUB ACME-2G Thread Ring Gauge
Parameters:
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Major Diameter: 4 inches (101.6 mm).
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Pitch: 4 threads per inch (TPI = 6.35 mm).
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Thread Depth: 0.0866 inches (2.2 mm) – shallower than standard ACME.
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Tolerance Class: 2G (allows controlled clearance for assembly).
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Material: High-carbon steel (hardened to HRC 60-62) or carbide for wear resistance.
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Surface Finish: ≤0.8 μm Ra for smooth engagement.
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Compliance: ASME B1.8-1988(R2021) and ANSI B1.8M.
5. 20 Stub ACME Thread Ring Gauge Specifications
Below are common Stub ACME-2G ring gauge specifications (ASME B1.8 compliant):
| No. | Specification | Major Diameter (Inch) | TPI | Pitch (mm) | Thread Depth (mm) |
|---|---|---|---|---|---|
| 1 | 10.5-8 STUB ACME-2G | 10.5" | 8 | 3.175 | 0.82 |
| 2 | 12.75-6 STUB ACME-2G | 12.75" | 6 | 4.233 | 1.10 |
| 3 | 10-4 STUB ACME-2G | 10.0" | 4 | 6.35 | 2.20 |
| 4 | 16.25-5 STUB ACME-2G | 16.25" | 5 | 5.08 | 1.65 |
| 5 | 12.5-6 STUB ACME-2G | 12.5" | 6 | 4.233 | 1.10 |
| 6 | 1.75-4 STUB ACME-2G | 1.75" | 4 | 6.35 | 2.20 |
| 7 | 2-5 STUB ACME-2G | 2.0" | 5 | 5.08 | 1.65 |
| 8 | 2.25-6 STUB ACME-2G | 2.25" | 6 | 4.233 | 1.10 |
| 9 | 2.5-4 STUB ACME-2G | 2.5" | 4 | 6.35 | 2.20 |
| 10 | 2.75-5 STUB ACME-2G | 2.75" | 5 | 5.08 | 1.65 |
| 11 | 3-4 STUB ACME-2G | 3.0" | 4 | 6.35 | 2.20 |
| 12 | 3.25-6 STUB ACME-2G | 3.25" | 6 | 4.233 | 1.10 |
| 13 | 3.5-5 STUB ACME-2G | 3.5" | 5 | 5.08 | 1.65 |
| 14 | 3.75-4 STUB ACME-2G | 3.75" | 4 | 6.35 | 2.20 |
| 15 | 4-4 STUB ACME-2G | 4.0" | 4 | 6.35 | 2.20 |
| 16 | 4.25-6 STUB ACME-2G | 4.25" | 6 | 4.233 | 1.10 |
| 17 | 4.5-5 STUB ACME-2G | 4.5" | 5 | 5.08 | 1.65 |
| 18 | 4.75-4 STUB ACME-2G | 4.75" | 4 | 6.35 | 2.20 |
| 19 | 5-6 STUB ACME-2G | 5.0" | 6 | 4.233 | 1.10 |
| 20 | 5.5-4 STUB ACME-2G | 5.5" | 4 | 6.35 | 2.20 |
Note: Thread depths and tolerances vary based on diameter and pitch. All gauges are customizable to meet ASME or ISO requirements.
6. Industry Applications
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Stub ACME Gauges: Artillery systems, compact robotics, hydraulic presses.
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ISO TR Gauges: CNC machine tools, European conveyor systems, pump shafts.
For tailored solutions, Sowant Precision Gage adapts to client specifications, ensuring compliance with ASME B1.8, ISO 2901, or proprietary designs.
References: ASME B1.8-1988, ISO 2901-2904, and technical documentation from Sowant Precision Gage.
