Class XX - ZZ Reversible Plain Plug Gages

Thread Check Inc. offers reversible plain plug gages for checking hole sizes and calibrating measuring equipment. Plain reversible plug gages are available in tool steel, chrome, and carbide. Ceramic pins are quoted on request. Gagemaker tolerances range from class ZZ to Class XX. Class XXX gagemaker tolerances are quoted on request. Reversible plain plug gauges are also known as wire type plug or pin gages. Thread Check Inc. keeps a wide selection of plain plug gauges in stock. All plain plug gages are manufactured to ASME/ANSI B47.1 AGD standard and ASME/ANSI B89.1.5.

Reversible plain plug gages can be removed from their handle and used at the opposite end when the one end becomes worn and out of tolerance. The gage members are standard 2.0" length pins that can be easily removed from the handle. Reversible plain plug gage handles are color coded for easy identification between the go and the no go size. The go side is green and the no go side is red. The sizes and gagemaker class are clearly marked on the handle. Depth steps or notches can be added on request which provide confirmation for a minimum hole depth requirement. Reversible plain plug gauges can be supplied in extra lengths up to 12.00".

Reversible plain plug gages may be supplied with air flats or pressure relief flats which allow air or fluid to escape when gaging blind holes.

A pilots, radii, or chamfer may be added to the end of the go member plug which allows for easier entry into the part. Diamond or blade shaped no go members can be supplied for checking out of roundness in product holes.

Reversible plain plug gauges are available from .0025" up to 1.01" and in the equivalent metric sizes.

Plain reversible plug gages can be purchased in plus, minus, or master tolerance. A go member plug gage should always have a plus tolerance. The no go should always be minus tolerance. Master tolerance plain reversible plug gages are typically used for calibrating measuring instruments.

When gaging the size of a hole, the go gage should enter smoothly into the hole with very little force. If the go gage enters, the hole is above the low limit of the specified size. The no go gage should be presented to the hole at its vertical axis. The no go gage should not enter or bite into the hole. If the plug gage does, the hole is too big. A go gage that enters into the hole a short distance and then stops is typically an indication of taper or bellmouth condition. Tolerances for gages are usually specified so as to insure that the total gage tolerance will not exceed 10% of the part tolerance.

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