Overview
The Regal-Beloit 13/16-20 UNJF-3B is a precision Go/No Go taperlock thread plug gage with handle, designed for quality assurance and inspection of internal threads. This gage is engineered to verify that tapped holes meet Class 3B tolerance specifications. Manufactured in the United States, the 13/16-20 UNJF-3B meets ANSI standards for thread inspection and is a critical tool in manufacturing quality control, maintenance, and system assembly operations.
Key Features
- Taperlock Design: Go and No Go members attach securely to a double-end handle for safe handling and easy member exchange
- Class 3B Tolerance: Precision-ground to Class 3B specifications for accurate thread pitch diameter measurement
- Dual-Function Inspection: Go member verifies acceptable thread size; No Go member confirms upper limit compliance
- High-Grade Tool Steel: Constructed from hardened 01 tool steel for durability and resistance to wear
- Complete Assembly: Supplied with handle for immediate use in production and maintenance environments
- Serialized Members: Individual gage members are serialized for traceability and calibration records
Technical Specifications
| Specification | Value |
| Size Designation | 13/16-20 UNJF-3B |
| Nominal Diameter | 13/16 inch (0.8125″) |
| Threads Per Inch | 20 TPI |
| Thread Series | UNJF (Unified National Joint Fine) |
| Class of Fit | 3B |
| Gage Type | Go/No Go Taperlock Plug Gage |
| Material | 01 Tool Steel, 60-62 RC |
| Design Standard | ANSI Class X Tolerance |
| Manufacturer | Regal-Beloit / HEMCO (USA) |
| Condition | New – No Box |
Typical Applications
- Quality control inspection of tapped holes in manufacturing operations
- Thread pitch diameter verification for precision machining applications
- Maintenance and field inspection of threaded assemblies
- Production testing to ensure Class 3B thread tolerance compliance
- System integrator and assembly shops requiring ANSI-compliant gaging
- Calibration reference for production tooling verification
Compatibility & Replacements
Compatible With
- Standard taperlock handles (double-end configuration)
- Any tapped hole or threaded component requiring Class 3B UNJF inspection
- ISO 17025 accredited calibration services
- ANSI B4.1 thread gaging standards
Replaces / Drop-In Replacement For
This gage is a direct replacement for any worn or damaged 13/16-20 UNJF-3B Go/No Go taperlock plug gage. If you are upgrading from an older single-end or reversible design to taperlock, verify compatibility with your process requirements.
Works With
- Manufacturing quality control (QC) systems and SPC tracking
- ISO 17025 and ISO 9001 certified facilities
- Standard go/no-go inspection protocols
- Taperlock member exchange systems for rapid changeover
