ANSI Thread plug gauge UNC 2B
10-07-014
Product Details
Title
UNC Thread Plug Gauge No.1–2" 2B | ANSI B1.1 Go No-Go Thread Gauge Manufacturer Supplier
Description
UNC Thread Plug Gauge 2B is a precision inspection tool designed for internal unified coarse thread verification and quality control. It offers a measuring range from No.1 to 2 inches, tolerance class 2B according to ANSI B1.1-1982, and a Go/No-Go double-ended design, making it suitable for machining, automotive, and general engineering industries. Manufactured from hardened tool steel with a steel handle, this gauge ensures reliable performance in thread inspection, production control, and workshop applications.
SKU Table
| Model / Art No | Thread Size | Accuracy | Resolution |
|---|---|---|---|
| Multiple SKUs (see below) | No.1 – 2" UNC | Class 2B (ANSI B1.1) | N/A (fixed gauge) |
Available Models (Partial List)
Number Sizes
| Thread Size | SKU |
|---|---|
| No.1×64 | 17-3330-111 |
| No.2×56 | 17-3330-131 |
| No.3×48 | 17-3330-151 |
| No.4×40 | 17-3330-171 |
| No.5×40 | 17-3330-191 |
| No.6×32 | 17-3330-211 |
| No.8×32 | 17-3330-231 |
| No.10×24 | 17-3330-251 |
| No.12×24 | 17-3330-271 |
Inch Sizes
| Thread Size | SKU |
|---|---|
| 1/4"-20 | 17-3333-706 |
| 5/16"-18 | 17-3333-718 |
| 3/8"-16 | 17-3333-709 |
| 7/16"-14 | 17-3330-371 |
| 1/2"-13 | 17-3333-712 |
| 9/16"-12 | 17-3330-431 |
| 5/8"-11 | 17-3333-716 |
| 3/4"-10 | 17-3337-442 |
| 7/8"-9 | 17-3337-453 |
| 1"-8 | 17-3337-464 |
| 1 1/8"-7 | 17-3330-591 |
| 1 1/4"-7 | 17-3330-621 |
| 1 3/8"-6 | 17-3330-661 |
| 1 1/2"-6 | 17-3330-691 |
| 1 3/4"-5 | 17-3330-721 |
| 2"-4.5 | 17-3330-731 |
Technical Specifications
- Product Name: UNC Thread Plug Gauge 2B (Go/No-Go)
- Category: Thread Plug Gauge
- Range: No.1 – 2" (UNC 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
- Steel handle construction
- Front marking: size and tolerance
- Back marking: serial number
- Standard: ANSI B1.1-1982
- Brand: Custom / OEM available
- Model / Art No: Multiple SKUs
Applications
This product is suitable for:
- Internal UNC thread inspection
- Production line acceptance testing
- Machined component verification
- Thread tolerance compliance checking
It is widely used in:
- Automotive manufacturing
- Aerospace engineering
- General machinery production
- Industrial maintenance
Selection Advice
- Recommended for users requiring standardized UNC thread verification (Class 2B)
- For metric threads, consider metric thread plug gauges (6H)
- For external threads, consider thread ring gauges
- For detailed measurement and analysis, consider thread micrometers or optical systems
Key Features
- Manufactured according to ANSI B1.1-1982 UNC thread standard
- Class 2B tolerance for general-purpose thread inspection
- Go/No-Go design for fast pass/fail evaluation
- Steel handle with engraved markings and serial number
- Secure packaging: plastic bag + transparent plastic box with label
FAQ
1. What is the difference between models?
Models differ by thread size and pitch (TPI). All follow UNC standard but are designed for specific diameters and thread counts.
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 inspection tool designed for quick Go/No-Go thread validation, not numerical measurement.
4. Which industries typically use this product?
- Automotive
- Aerospace
- Industrial manufacturing
- Maintenance and repair operations
5. Is customization available?
Yes, available options include:
- Different tolerance classes (e.g., 3B)
- Special thread forms (UNF, UNEF)
- OEM branding and marking
- Calibration certificates (traceable)