ANSI Extra fine thread ring gauge NO GO UNEF 2A
10-07-022
Product Details
Title
UNEF Thread Ring Gauge No.12–1-1/2" 2A NO-GO | ANSI B1.1 Extra Fine Thread Ring Gauge Manufacturer Supplier
Description
UNEF Thread Ring Gauge NO-GO 2A is a precision inspection tool designed for external unified extra fine thread rejection testing and tolerance verification. It offers a measuring range from No.12 to 1-1/2 inches, tolerance class 2A according to ANSI B1.1, and a NO-GO 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 quality control applications.
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 | 17-3429-291 |
Inch Sizes
| Thread Size | SKU |
|---|---|
| 1/4"-32 | 17-3429-321 |
| 7/16"-28 | 17-3429-391 |
| 1/2"-28 | 17-3429-771 |
| 9/16"-24 | 17-3429-761 |
| 5/8"-24 | 17-3429-481 |
| 3/4"-20 | 17-3429-511 |
| 7/8"-20 | 17-3429-541 |
| 15/16"-20 | 17-3429-561 |
| 1"-20 | 17-3429-581 |
| 1 1/8"-18 | 17-3429-611 |
| 1 1/4"-18 | 17-3429-641 |
| 1 5/16"-18 | 17-3429-661 |
| 1 3/8"-18 | 17-3429-681 |
| 1 1/2"-18 | 17-3429-711 |
Technical Specifications
- Product Name: UNEF Thread Ring Gauge NO-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:
- NO-GO ring gauge for rejection 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 rejection 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 strict external thread tolerance control (NO-GO inspection)
- For acceptance testing, use UNEF 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 verification
- NO-GO design ensures proper rejection of oversized threads
- Traceable GM serial number system
- Packaging: plastic bag + blue plastic box with labeled identification
FAQ
1. What is the difference between models?
Models differ by thread size and TPI. UNEF threads provide finer pitch than UNF and are used in high-precision assemblies.
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 NO-GO inspection gauge, used for pass/fail validation rather than numerical 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 branding and packaging
- Calibration certificates (traceable)