High-Precision Inch & American Thread Gauges (UN / BSW) | Tungsten Carbide & Ceramic Options
- Standard Compliance: Fully compliant with ANSI B1.2-83 (American Unified) and BS 919-1:2007 (British Whitworth) standards. +1
- Premium Materials: Available in extreme wear-resistant Tungsten Carbide, Zirconia Ceramic, and high-grade GCr15 Bearing Steel. +4
- Certified Accuracy: Each unit is rigorously calibrated in a $20^{\circ}\text{C}$ constant-temperature environment, complete with a traceable inspection report. +1
- Versatile Range: Covering sizes from No. 0 up to 6" , supporting all standard tolerance classes including 1A/2A/3A and 1B/2B/3B. +3
Product Overview
Inch and American thread gauges are critical metrology instruments for verifying threaded components manufactured to North American and British engineering standards. At Meter Precision, our UN series (UNC, UNF, UNEF) and Whitworth series (BSW, BSF) thread plug and ring gauges are designed for OEMs and suppliers serving the aerospace, automotive, and oil & gas industries. By utilizing advanced materials like Tungsten Carbide and Ceramic, we eliminate the rapid wear issues associated with standard steel gauges, ensuring your high-volume production remains within strict tolerance limits without the need for constant gauge replacement.
Unmatched Wear Resistance & Lifespan
Comprehensive Thread Profiles
Traceable Quality Assurance
Technical Specifications
Parameter | Value |
Thread Series | Unified (UNC, UNF, UNEF, UNS, UNJ); Whitworth (BSW, BSF)+1 |
Thread Angle ($\alpha$) | $60^{\circ}$ (American UN Series) / $55^{\circ}$ (British BSW Series)+1 |
Material Options | Standard: GCr15+1 Premium: Tungsten Carbide, Ceramic, SKD11, CrWMn+3 |
Hardness | 58-65 HRC (For steel variants)+1 |
Standards | ANSI B1.2-83 , BS 919-1:2007+1 |
Tolerance Classes (UN & BSW) | Plug Gauges (Internal): 1B, 2B, 3B+2 Ring Gauges (External): 1A, 2A, 3A+1 |
Common Fits | 2B / 2A (Recommended for standard applications)+2 |
Customization | Left-hand (LH), Special pitch, Multi-start+1 |
Applications
Our Inch/American thread gauges are specifically engineered for export-oriented manufacturing and industries adhering to imperial standards
Packaging & Shipping
We ensure your gauges arrive in pristine condition, ready for the lab or shop floor
Anti-corrosion treatment applied to all steel gauges prior to packing
Securely housed in custom-fitted, shock-absorbing plastic or wooden cases
Vacuum-sealed with desiccants to protect against humidity during international transit to North America or Europe
Clearly labeled with thread size, class, and unique serial numbers for immediate traceability
FAQ about Inch/American Thread Gauges
UNC (Unified National Coarse) has fewer threads per inch and is typically used for general assembly. UNF (Unified National Fine) has more threads per inch, providing higher tension strength and finer adjustment, often used in aerospace and automotive applications.
Class 2A (external) and 2B (internal) are the most common tolerances for general commercial products. Class 3A and 3B represent a tighter fit with zero allowance, required for high-precision applications like aerospace components where safety and exact alignment are critical.
The primary difference lies in the thread profile geometry. The American Unified (UN) thread features a $60^{\circ}$ thread angle , whereas the British Standard Whitworth (BSW) features a $55^{\circ}$ thread angle with rounded crests and roots.
Yes, we manufacture UNJ series gauges specifically designed with a larger root radius for aerospace fasteners, effectively reducing stress concentration
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