ANSI Fine thread ring gauge GO UNF 2A
10-07-018
Product Details
Title
UNF Thread Ring Gauge No.0–1-1/2" 2A GO | ANSI B1.1 Fine Thread Ring Gauge Manufacturer Supplier
Description
UNF Thread Ring Gauge GO 2A is a precision inspection tool designed for external unified fine thread verification and production control. It offers a measuring range from No.0 to 1-1/2 inches, tolerance class 2A according to ANSI B1.1, and a GO-only 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 assurance processes.
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 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:
- GO-only ring gauge design
- 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 UNF thread inspection
- Shaft thread verification
- Production line acceptance testing
- Thread fit compliance control
It is widely used in:
- Aerospace industry
- Automotive manufacturing
- Precision engineering
- Equipment production
Selection Advice
- Recommended for users requiring external fine thread GO inspection (Class 2A)
- For complete inspection (GO + NO-GO), consider thread ring gauge sets
- For internal thread inspection, consider thread plug gauges (2B)
- For detailed measurement, consider thread micrometers or optical systems
Key Features
- Conforms to ANSI B1.1 UNF fine thread standard
- Class 2A tolerance for external thread inspection
- GO-only design for fast production verification
- Traceable GM serial number system
- Protective packaging: plastic bag + white plastic box with labeled identification
FAQ
1. What is the difference between models?
Models differ by thread diameter and TPI. All follow UNF standard but are designed for specific fine thread sizes.
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 rather than numerical measurement.
4. Which industries typically use this product?
- Aerospace
- Automotive
- Precision machining
- Industrial manufacturing
5. Is customization available?
Yes, customization options include:
- Different tolerance classes (e.g., 3A)
- Special thread standards or pitches
- OEM branding and packaging
- Calibration certificates (traceable)