|CLICK HERE FOR INDEX PAGE|
|MACHINE SCREWS - MATERIALS -
T HEAD BOLT - COUNTERSUNK - CAPTIVE MACHINE SCREW
|V.Ryan © 2019|
|PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET|
|PDF FILE - CLICK HERE FOR SECOND PRINTABLE WORKSHEET|
|Machine screws are manufactured from a variety of materials. The titanium screws shown below, have been manufactured for the aerospace industry, where the strength to weight ratio must by high. .
More common machine screws are manufactured from stainless steel, carbon steel, brass and even copper. Steel screws tend to be zinc plated to prevent corrosion. Machine screws are sometimes plated with, brass, copper and nickel. A more modern process applied to machine screws is anodising, which means a vast range of colours can be used. Anodising both prevents corrosion and gives an attractive finish to the machine screw.
|T HEAD BOLT|
|Used when there is a need to bolt a device such as a machine vice to a milling machine table, ready for machining. In this example, T Bolts are used to secure the machine vice|
|The clamping set seen below, holds an aluminium rough casting down on the table of a vertical miller, ready for machining. Two T Bolts can be clearly seen. This is an effective method of securing castings, that cannot fit into a machine vice. T Bolts are easy to use and can be tightened and loosened easily.|
|COUNTERSUNK MACHINE SCREW|
|This countersunk screw is ideal when the machine screws head must to level for the surface of the material. This example ((left) has an hex socket (hexagonal socket) for use with an allen key.
Machine screws are available with almost every description of head, such as the most common the ‘slot head’ countersunk screw, seen right
The serrated jaws of the machine vice (below), are held in position by a countersunk machine screw, with a cross head / phillips® head
|CAPTIVE SCREW - HEX SOCKET|
Captive screws are designed so that they cannot be removed fully when loosened. They work in combination with a captive washer.
When being fitted, the screw is placed through the first metal section (A) and then the washer. The screw can be threaded through the washer BUT not withdrawn / unscrewed. The threaded portion of the screw is then tightened into the threaded hole of the second section of material (B)
|CLICK HERE FOR MATERIALS INDEX PAGE|