Greenslade & Company is a specialized provider of dimensional calibration services to manufacturers and distributors worldwide. It supplies one of the widest ranges of fastener-inspection equipment, globally — including GO/NOGO and variable thread gages, recess measuring devices, length and concentricity gages, tapping screw testing equipment, and more.
Greenslade’s TRI-ROLL External Thread Gage is one such example, ideally suited for thread-measuring applications where the gage is to be dedicated to only one thread size or is used to measure a narrow range of sizes. This gage comes in several frame sizes, providing a total measurement range of #0-80 (M1.6) through 3-3/8 inches (M85).
Each frame size will cover two to four standard thread diameters in inch and metric sizes. For example, the #4 frame size covers #10, #12, l/4-inch and 5/16-inch sizes. This design is best suited to manufacturing applications.
TRI-ROLL Gages are set with Gage Class “W” single end, full form, threaded setting plugs. Users having ring-gage setting plugs can use them if only the full-formed section is used. For the greatest measuring accuracy, set the TRI-ROLL Gage using the calibrated size of the setting plug instead of the nominal size marked on its handle.
The result of a long form Gage Repeatability and Reproducibility Study of the TRI-ROLL Gage was 15% with functional diameter gaging rolls and 20% with pitch diameter gaging rolls.
Greenslade’s thread gages meet all of the specific thread characteristic measuring requirements of ANSI/ASME Systems 21, 22, and 23 SAE AS8879 “Other” and “Safety Critical” inspection levels.
Learn more about Greenslade’s external variable gage’s here.