ANSI Extra fine thread ring gauge GO UNEF 2A
10-07-021
Product Details
Title
UNEF Thread Ring Gauge No.12–1-1/2" 2A GO | ANSI B1.1 Extra Fine Thread Ring Gauge Manufacturer Supplier
Description
UNEF Thread Ring Gauge GO 2A is a precision inspection tool designed for external unified extra fine thread acceptance testing and quality control. It offers a measuring range from No.12 to 1-1/2 inches, tolerance class 2A according to ANSI B1.1, and a GO-only limit design, making it suitable for aerospace, precision engineering, and high-tolerance machining industries. Manufactured from hardened tool steel, this gauge ensures reliable performance for thread inspection, machining validation, and production quality assurance.
SKU Table
| Model / Art No | Thread Size | Accuracy | Resolution |
|---|---|---|---|
| Multiple SKUs (see below) | No.12 – 1-1/2" UNEF | Class 2A (ANSI B1.1) | N/A (limit gauge) |
Available Models (Full List)
Number Size
| Thread Size | SKU |
|---|---|
| No.12×32 | 17-3419-291 |
Inch Sizes
| Thread Size | SKU |
|---|---|
| 1/4"-32 | 17-3419-321 |
| 7/16"-28 | 17-3419-391 |
| 1/2"-28 | 17-3419-751 |
| 9/16"-24 | 17-3419-761 |
| 5/8"-24 | 17-3419-481 |
| 3/4"-20 | 17-3419-511 |
| 7/8"-20 | 17-3419-541 |
| 15/16"-20 | 17-3419-561 |
| 1"-20 | 17-3419-581 |
| 1 1/8"-18 | 17-3419-611 |
| 1 1/4"-18 | 17-3419-641 |
| 1 5/16"-18 | 17-3419-661 |
| 1 3/8"-18 | 17-3419-681 |
| 1 1/2"-18 | 17-3419-711 |
Technical Specifications
- Product Name: UNEF Thread Ring Gauge GO 2A
- Category: Thread Ring Gauge
- Range: No.12 – 1-1/2" (UNEF series)
- Accuracy: Class 2A
- Resolution: N/A (limit gauge)
- Material: Hardened tool steel
- Display: None
- Output: None
- Structure Feature:
- GO-only ring gauge for acceptance testing
- Extra fine thread profile for precision applications
- Front marking: size and tolerance
- Back marking: GM serial number (GX + year + sequence)
- Standard: ANSI B1.1
- Brand: Custom / OEM available
- Model / Art No: Multiple SKUs
Applications
This product is suitable for:
- External UNEF thread inspection
- High-precision shaft thread verification
- Aerospace fastener quality control
- Tight tolerance production validation
It is widely used in:
- Aerospace industry
- Precision instrumentation
- Defense manufacturing
- High-end machining
Selection Advice
- Recommended for users requiring high-precision external UNEF thread acceptance testing (GO inspection)
- For rejection control, use UNEF NO-GO thread ring gauges (2A)
- For internal threads, use UNEF thread plug gauges (2B)
- For broader applications, consider UNF or UNC thread gauges
Key Features
- Conforms to ANSI B1.1 UNEF extra fine thread standard
- Class 2A tolerance for precision external thread inspection
- GO design for fast production acceptance testing
- Traceable GM serial number system
- Packaging: plastic bag + white plastic box with labeled identification
FAQ
1. What is the difference between models?
Models differ by thread size and TPI. UNEF threads have finer pitch than UNF and UNC, enabling higher precision and better load distribution.
2. Accuracy vs Resolution — what applies here?
- Accuracy: Defined by ANSI B1.1 Class 2A tolerance
- Resolution: Not applicable, as this is a limit gauge
3. Manual vs Digital — where does this product fit?
This is a manual GO inspection gauge, designed for pass/fail validation rather than measurement.
4. Which industries typically use this product?
- Aerospace
- Precision engineering
- Defense manufacturing
- High-precision assembly industries
5. Is customization available?
Yes, customization options include:
- Special UNEF thread sizes or pitches
- Different tolerance classes (e.g., 3A)
- OEM marking and packaging
- Calibration certificates (traceable)