Stub Acme Thread Form - General purpose (g), centralizing (c), and stub acme. There are three main classes of acme thread forms: When formulated prior to 1895, regular acme screw threads were intended to replace square threads and a variety of threads.
When formulated prior to 1895, regular acme screw threads were intended to replace square threads and a variety of threads. There are three main classes of acme thread forms: General purpose (g), centralizing (c), and stub acme.