Thredco 1/4-20 UNC-2B Thread Plug Gage Thread Plug Gauge

Description:

The Thredco 1/4-20 UNC-2B Thread Plug Gage is used in precision dimensional inspection to verify the accuracy and tolerance of 1/4-20 UNC Class 2B internal threads. Commonly installed in machine shops, CNC manufacturing facilities, automotive production lines, aerospace machining, and quality control laboratories for inspection of tapped holes and threaded components. Quality inspectors, machinists, and maintenance technicians use this thread plug gage for in-process inspection, final quality verification, calibration, and replacement of worn thread inspection gauges.

Applications:

The Thredco 1/4-20 UNC-2B thread plug gage is designed to verify that internally threaded components meet Unified National Coarse (UNC) Class 2B dimensional requirements using GO/NO-GO inspection methods. It is widely used in precision machining, CNC manufacturing, tool and die production, metal fabrication, aerospace, automotive manufacturing, and quality assurance departments where accurate thread inspection is essential for interchangeability and compliance with ANSI thread standards.

Technical Specifications:

• Brand: Thredco
• Thread Size: 1/4-20
• Product Type: Thread Plug Gage
• Thread Series: UNC (Unified National Coarse)
• Thread Class: 2B
• Gauge Type: GO / NO-GO Thread Plug Gage
• Application: Internal Thread Inspection
• Measurement System: Inch (Imperial)
• Threads per Inch (TPI): 20
• Standard: ANSI B1.2
• Material: Hardened Tool Steel
• Hardness: Approximately 58–63 HRC
• Inspection Method: GO/NO-GO Functional Thread Verification
• Designed for Precision Internal Thread Measurement
• Suitable for Manufacturing, Metrology, CNC Machining, and Quality Control Laboratories

Common Replacements:

• Vermont Gage 301126040 1/4-20 UNC-2B GO/NO-GO
• Vermont Gage 301126010 1/4-20 UNC-2B GO
• Vermont Gage 301126020 1/4-20 UNC-2B NO-GO