3-4 STUB ACME-2G Thread Ring Gage
3-4 STUB ACME-2G Thread Ring Gage made in China, Chinese 3-4 STUB ACME-2G Thread Ring Gage
A Comparative Analysis of ASME B1.5 ACME and ASME B1.8 Stub ACME Thread Gauges
1. Overview of ACME and Stub ACME Threads
ACME and Stub ACME threads are both standardized trapezoidal screw threads under the ASME framework, widely used in power transmission and motion control applications. While they share similarities in design principles, their distinct specifications cater to different engineering requirements.
ASME B1.5 ACME Threads
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Standard: Governed by ASME B1.5-1997 (latest revision: 2024).
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Thread Profile: 29° included angle, trapezoidal form with deeper thread depth compared to Stub ACME.
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Classes of Fit: 2G, 3G, and 4G (General Purpose) and 2C, 3C, 4C (Centralizing).
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2G: Most common, allowing free movement with clearance on all diameters.
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3G/4G: Tighter tolerances for reduced backlash.
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Applications: Ideal for linear motion systems, lead screws, and machinery requiring precise alignment and load distribution. Commonly used in industrial automation, CNC machines, and heavy equipment.
ASME B1.8 Stub ACME Threads
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Standard: Defined by ASME B1.8-1988 (revised in 2021).
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Thread Profile: 29° included angle but with a shallower thread depth and coarser pitch.
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Key Features:
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Designed for applications requiring high strength in limited axial space.
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Coarser pitch reduces thread engagement depth, minimizing stress concentration.
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Applications: Used in specialized military, aerospace, and heavy-duty machinery where space constraints or metallurgical limitations exist.
2. Similarities and Differences
| Aspect | ACME (B1.5) | Stub ACME (B1.8) |
|---|---|---|
| Thread Angle | 29° | 29° |
| Pitch Design | Finer pitch for precise motion | Coarser pitch for strength and space savings |
| Depth | Deeper threads | Shallower threads |
| Fit Classes | 2G, 3G, 4G (General Purpose) | Typically 2G (similar tolerance principles) |
| Applications | General machinery, CNC systems | Space-constrained, high-stress environments |
3. Sowant Precision Gage’s 3-4 STUB ACME-2G Thread Gauge
Sowant Precision Gage specializes in manufacturing 3-4 STUB ACME-2G gauges compliant with ASME B1.8 standards. Key parameters include:
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Major Diameter: 3 inches (76.2 mm).
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Pitch: 4 threads per inch (TPI), translating to a pitch of 6.35 mm (25.4/4).
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Class of Fit: 2G (General Purpose), allowing moderate clearance for free assembly.
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Material: High-grade tool steel or carbide for durability.
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Standards Compliance: ASME B1.8-1988(R2021) and FED-STD H28/13 for federal applications.
4. Example Specifications of Stub ACME Thread Gauges
Below are 20 common Stub ACME thread gauge specifications, covering diameters from 0.5" to 5":
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10.5"-8 STUB ACME-2G
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12.75"-6 STUB ACME-2G
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14"-4 STUB ACME-2G
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12.125"-12 STUB ACME-2G
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10.25"-5 STUB ACME-2G
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10.5"-6 STUB ACME-2G
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1.75"-4 STUB ACME-2G
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2"-5 STUB ACME-2G
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2.125"-12 STUB ACME-2G
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2.25"-6 STUB ACME-2G
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2.5"-4 STUB ACME-2G
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2.75"-5 STUB ACME-2G
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3"-4 STUB ACME-2G (as produced by Sowant)
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3.25"-6 STUB ACME-2G
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3.5"-5 STUB ACME-2G
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3.75"-4 STUB ACME-2G
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4"-6 STUB ACME-2G
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4.25"-5 STUB ACME-2G
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4.5"-4 STUB ACME-2G
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5"-6 STUB ACME-2G
Note: Custom diameters and pitches (e.g., multi-start threads) are available upon request.
5. Industry Applications
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ACME Gauges: Ideal for conveyor systems, valve actuators, and precision lead screws.
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Stub ACME Gauges: Preferred in artillery mechanisms, compact robotics, and hydraulic systems where strength and space efficiency are critical.
For detailed specifications or custom requirements, consult standards like ASME B1.5 and B1.8 or contact suppliers like Sowant Precision Gage for tailored solutions.
References: ASME B1.5-1997 , ASME B1.8-1988 , Sowant Gage , and technical Q&A forums .
