284 Acme Screw Thread Gage 51319

The Starrett 284 Acme Standard Screw Thread Gage is a standard for grinding and setting tools when cutting Acme threads, which have the same depth as square threads but the sides of the threads are at an inclination of 14-1/2 Deg (29 Deg included angle). This form of thread is used extensively and has in many instances replaced the square thread in machine construction. The advantages of the Acme thread is its strength and the ease by which it can be cut compared with square threads.

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  • The angles and edges of this gage are hardened, ground and carefully tested
  • In use, the angle on the thread cutting tool is checked on the large precision-ground V at the end of the gage.


  • Range (TPI): Acme Standard Screw Thread
  • Material: Steel


    2D Dimensional Drawing (PDF)



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