ANSI Extra fine thread plug gauge UNEF 2B
10-07-020
Product Details
Title
UNEF Thread Plug Gauge No.12–1-1/2" 2B | ANSI B1.1 Go No-Go Extra Fine Thread Gauge Manufacturer Supplier
Description
UNEF Thread Plug Gauge 2B is a precision inspection tool designed for internal unified extra fine thread verification and quality control. It offers a measuring range from No.12 to 1-1/2 inches, tolerance class 2B according to ANSI B1.1, and a Go/No-Go double-ended structure, making it suitable for aerospace, precision engineering, and high-tolerance machining industries. Manufactured from hardened tool steel with a steel handle, this gauge provides reliable performance for thread inspection, production validation, and quality assurance applications.
SKU Table
| Model / Art No | Thread Size | Accuracy | Resolution |
|---|---|---|---|
| Multiple SKUs (see below) | No.12 – 1-1/2" UNEF | Class 2B (ANSI B1.1) | N/A (fixed gauge) |
Available Models (Full List)
Number Size
| Thread Size | SKU |
|---|---|
| No.12×32 | 17-3330-281 |
Inch Sizes
| Thread Size | SKU |
|---|---|
| 1/4"-32 | 17-3330-311 |
| 7/16"-28 | 17-3330-381 |
| 1/2"-28 | 17-3330-411 |
| 9/16"-24 | 17-3330-441 |
| 5/8"-24 | 17-3330-471 |
| 3/4"-20 | 17-3330-501 |
| 7/8"-20 | 17-3330-531 |
| 15/16"-20 | 17-3330-551 |
| 1"-20 | 17-3330-571 |
| 1 1/8"-18 | 17-3330-601 |
| 1 1/4"-18 | 17-3330-631 |
| 1 5/16"-18 | 17-3330-651 |
| 1 3/8"-18 | 17-3330-671 |
| 1 1/2"-18 | 17-3330-701 |
Technical Specifications
- Product Name: UNEF Thread Plug Gauge 2B (Go/No-Go)
- Category: Thread Plug Gauge
- Range: No.12 – 1-1/2" (UNEF series)
- Accuracy: Class 2B
- Resolution: N/A (limit gauge)
- Material: Hardened tool steel
- Display: None
- Output: None
- Structure Feature:
- Go/No-Go double-ended design
- Extra fine thread profile for high precision applications
- Steel handle construction
- Front marking: size and tolerance
- Back marking: GM serial number (GX + year + serial sequence)
- Standard: ANSI B1.1
- Brand: Custom / OEM available
- Model / Art No: Multiple SKUs
Applications
This product is suitable for:
- Internal extra fine thread inspection
- High-precision component verification
- Aerospace fastener quality control
- Tight tolerance thread validation
It is widely used in:
- Aerospace industry
- Precision instrumentation
- High-end manufacturing
- Defense and engineering applications
Selection Advice
- Recommended for users requiring high-precision UNEF thread inspection in tight tolerance assemblies
- For general-purpose threads, consider UNC thread plug gauges
- For finer but less extreme tolerance, consider UNF thread plug gauges
- For external thread inspection, consider thread ring gauges
Key Features
- Manufactured according to ANSI B1.1 UNEF extra fine thread standard
- Class 2B tolerance for precision thread verification
- Go/No-Go design for efficient pass/fail inspection
- Traceable GM serial number system (GX + year + sequence)
- Protective packaging: oil paper + white plastic tube with labeled identification
FAQ
1. What is the difference between models?
Models differ by thread diameter and TPI (threads per inch). UNEF series provides finer pitches than UNF and UNC, suitable for precision assemblies.
2. Accuracy vs Resolution — what applies here?
- Accuracy: Defined by ANSI B1.1 Class 2B tolerance
- Resolution: Not applicable, as this is a limit gauge
3. Manual vs Digital — where does this product fit?
This is a manual Go/No-Go gauge, used for fast inspection rather than numerical measurement.
4. Which industries typically use this product?
- Aerospace (primary use case)
- Precision instrumentation
- Defense manufacturing
- High-precision engineering
5. Is customization available?
Yes, customization options include:
- Special UNEF thread sizes and pitches
- Different tolerance classes (e.g., 3B)
- OEM marking and packaging
- Traceable calibration certificates