THE BASIC PRINCIPLES OF DIFFERENT TYPES OF SCREW HEADS

The trapezoidal thread is similar on the acme thread, besides which the thread angle is three hundred. It's created in metric dimensions; that is why it's called "metric lead screw" or "metric acme screw."Tamper Resistant Hex- Tamper-resistant hex drives are tamper resistant with a little pin in the middle from the generate. A Exclusive Resource