For the machinists, toolmakers, and quality control pros out there – this is a serious piece of precision equipment. This is a Vermont Gage 'No-Go' Plug Gage. In simple terms, it's a super accurate cylindrical pin used to check the size of a hole. The 'No-Go' (marked with a '-') is meant to check the upper limit of a hole's tolerance – if this gage goes into the hole, the hole is too big. This specific one has a diameter of 0.333 inches and is Class ZZ, which means its own manufacturing tolerance is within 0.0002 inches – it's for longer wear and less critical applications compared to XX or X class. It's made from hardened tool steel (60-62 Rc) for extreme durability and has a smooth, ground finish (at least 10-microinch). Each gage is 2 inches long, comes sealed in a VCI bag with rust preventative, and you can get a certificate of accuracy traceable to NIST (National Institute of Standards and Technology) for it, which is crucial for calibration. The gage is marked with its size and tolerance direction. Vermont Gage is a reputable, ISO-certified US manufacturer. This is an essential, reliable tool for anyone who needs to verify hole sizes in parts, fixtures, or for calibrating other measuring equipment in a workshop or inspection department. It's built to last and perform with precision.
