Osg 1500101700 Plug Thread Gage 1/4-20 2B Class

Product Description

The OSG 1500101700 is a double-end plug thread gage used to verify 1/4-20 UNC internal threads to the 2B tolerance class. One end carries the Go member and the opposite end carries the No Go member, allowing a technician to confirm both the minimum and maximum thread acceptance limits in a single tool. The gage body is machined from high speed steel for wear resistance and dimensional stability. A handle is included. This type of gage is standard equipment in any shop or field environment where threaded fastener integrity must be verified before assembly.

The 1500101700 is suited for inspection of 1/4-20 tapped holes in metalworking, manufacturing, maintenance, and repair operations. Typical applications include verifying threaded holes in enclosures, brackets, pipe fittings, HVAC equipment housings, electrical panels, and structural components where 2B class fit is the specified standard. The double-end design reduces tool changeover time during high-volume inspection work.

Key Features

• Double-end design with Go and No Go members on a single gage
• Checks 1/4-20 UNC internal threads to 2B tolerance class
• High speed steel construction for durability and wear resistance
• Handle included — no separate purchase required
• Compact overall length of 3 inches for use in confined inspection areas

Compatibility

Designed for inspection of 1/4-20 UNC tapped holes requiring 2B class thread tolerance verification.

Installation Notes

Thread gages are inspection tools, not cutting tools — do not use force when inserting the Go or No Go members. The Go end should enter the threaded hole under hand pressure only; the No Go end should not enter. Keep the gage clean and lightly oiled when not in use to preserve calibration. Periodic re-calibration against a master reference is recommended per your quality control program.