Metrology Glossary: Thread Gauge
What Is A Thread Gauge?
A thread gauge, also known as a screw or pitch gauge, precisely measures the pitch or lead of screw threads. The pitch is the distance between consecutive threads, while the lead represents the distance a screw advances in one full rotation. These gauges ensure screws and threaded holes meet exact specifications. The two main types are plug and ring gauges. Plug gauges assess internal threads by insertion, while ring gauges measure external threads by fitting over them. Both types come in GO and NO GO versions. GO gauges verify that threads are at least the minimum size specified, and NO GO gauges confirm threads do not exceed the maximum specified size.
What Are Thread Gauges Used For?
Manufacturing:
- Quality Control: Thread gauges ensure precise tolerances for threaded parts, inspecting materials and validating production processes.
- Tooling and Setup Verification: Used to identify tooling issues and setup errors in manufacturing processes.
- Maintenance and Repair: Thread gauges assess worn threads, guiding replacement parts and repair procedures.
Construction:
- Fastener Selection: Thread gauges guarantee compatibility between fasteners and threaded holes for secure fastening.
- Pipe and Fitting Installation: Verify correct threading for leak-proof connections in plumbing and piping systems.
Automotive:
- Engine and Component Assembly: Thread gauges ensure tight tolerances for precise assembly in automotive systems.
Aerospace:
- High-Precision Applications: Thread gauges maintain strict standards, crucial for safety and performance in aerospace components.
Related Terms
A lead gage is a tool for measuring thread lead, which is the distance between threads on a threaded part....
A pin gauge is a specialized tool for precisely assessing hole and slot dimensions and positions....
A thread profile gauge serves as a precision tool designed for the measurement and inspection of tapered threads....
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