ANSI Fine thread ring gauge NO GO UNF 2A
10-07-019
Product Details
Title
UNF Thread Ring Gauge No.0–1-1/2" 2A NO-GO | ANSI B1.1 Fine Thread Ring Gauge Manufacturer Supplier
Description
UNF Thread Ring Gauge NO-GO 2A is a precision inspection tool designed for external unified fine thread rejection testing and tolerance verification. It offers a measuring range from No.0 to 1-1/2 inches, tolerance class 2A according to ANSI B1.1, and a NO-GO limit design, making it suitable for aerospace, automotive, and precision 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.0 – 1-1/2" UNF | Class 2A (ANSI B1.1) | N/A (limit gauge) |
Available Models (Partial List)
Number Sizes
| Thread Size | SKU |
|---|---|
| No.0×80 | 17-3419-111 |
| No.1×72 | 17-3419-131 |
| No.2×64 | 17-3419-151 |
| No.3×56 | 17-3419-171 |
| No.4×48 | 17-3419-191 |
| No.5×44 | 17-3419-211 |
| No.6×40 | 17-3419-231 |
| No.8×36 | 17-3419-251 |
| No.10×32 | 17-3419-271 |
| No.12×28 | 17-3419-301 |
Inch Sizes
| Thread Size | SKU |
|---|---|
| 1/4"-28 | 17-3419-331 |
| 5/16"-24 | 17-3419-351 |
| 3/8"-24 | 17-3419-371 |
| 7/16"-20 | 17-3419-401 |
| 1/2"-20 | 17-3419-431 |
| 9/16"-18 | 17-3419-461 |
| 5/8"-18 | 17-3419-491 |
| 3/4"-16 | 17-3419-521 |
| 7/8"-14 | 17-3419-551 |
| 1"-12 | 17-3419-591 |
| 1 1/8"-12 | 17-3419-621 |
| 1 1/4"-12 | 17-3419-651 |
| 1 3/8"-12 | 17-3419-691 |
| 1 1/2"-12 | 17-3419-721 |
Technical Specifications
- Product Name: UNF Thread Ring Gauge NO-GO 2A
- Category: Thread Ring Gauge
- Range: No.0 – 1-1/2" (UNF series)
- Accuracy: Class 2A
- Resolution: N/A (limit gauge)
- Material: Hardened tool steel
- Display: None
- Output: None
- Structure Feature:
- NO-GO ring gauge design for rejection testing
- Precision fine thread profile
- 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 thread rejection inspection
- Quality control and tolerance verification
- Machined shaft thread validation
- Production line inspection
It is widely used in:
- Aerospace industry
- Automotive manufacturing
- Precision machining
- Industrial equipment production
Selection Advice
- Recommended for users requiring external thread tolerance verification (NO-GO inspection)
- For acceptance testing, use UNF GO thread ring gauges (2A)
- For internal threads, use thread plug gauges (2B)
- For full inspection control, use GO + NO-GO gauge sets
Key Features
- Conforms to ANSI B1.1 UNF fine thread standard
- Class 2A tolerance for 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. All are UNF fine thread but vary by diameter and pitch.
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 inspection gauge, used for pass/fail verification without numerical output.
4. Which industries typically use this product?
- Aerospace
- Automotive
- Precision engineering
- Industrial manufacturing
5. Is customization available?
Yes, customization options include:
- Different tolerance classes (e.g., 3A)
- Special thread specifications
- OEM branding and packaging
- Calibration certificates (traceable)