Metalwork Threaded Fasteners Threaded Fasteners Hello Threaded Fasteners

Metalwork Threaded Fasteners

Threaded Fasteners Hello

Threaded Fasteners Materials Threaded fasteners are suitable to be used on all kinds of materials, examples of which are: n Metal n Wood n Plastic

Threaded Fasteners Threaded fasteners are available in several different materials depending on the purpose for which they will be used. The most commonly used materials from which they are made are:

Threaded Fasteners n n n Low Carbon Steel Medium Carbon Steel Stainless Steel Mild Steel Alloy Steel

Threaded Fasteners Threaded fasteners can also be galvanised for added corrosion resistance for use out side and in costal areas.

Threaded Fasteners Hello

Threaded Fasteners Description Threaded fasteners are mainly used where the parts to be joined may need to be dismantled.

Threaded Fasteners The main groups of threaded fasteners include: n Screws n Bolts n Studs n Nuts

Threaded Fasteners By using these, joined parts can be easily separated again when required.

Threaded Fasteners Screws serve several purposes: n Joining parts together n Preventing relative movements between parts n Adjustment purposes

Threaded Fasteners

Threaded Fasteners Screws When used for joining 2 parts the screw passes through a clearance hole in one part and is screwed into a tapped hole in the other part. Therefore a nut is not required as one of the parts is essentially acting as the nut.

Threaded Fasteners Screws

Threaded Fasteners Screws There are many different types of screw available: n Set Screw n Grub Screw n Thumb Screw n Self Tapping Screw

Threaded Fasteners Set Screws These are threaded for their full length and are available with various shapes of head.

Threaded Fasteners Set Screw

Threaded Fasteners Grub Screws These are used to prevent relative movement between parts. They can be screwed below the surface therefore when they are used on a revolving shaft there is no fear of them hitting anything.

Threaded Fasteners Grub Screws

Threaded Fasteners Grub Screws

Threaded Fasteners Thumb Screws These screws are tightened and loosened by hand. They are commonly used for locking tools at particular settings.

Threaded Fasteners Thumb Screws

Threaded Fasteners Thumb Screws

Threaded Fasteners Self Tapping Screws These are used for sheet metal.

Threaded Fasteners Self Tapping Screws

Threaded Fasteners Self Tapping Screws

Threaded Fasteners Bolts are most often used to join parts together with the aid of nuts. Bolts are usually threaded for only a part of their length.

Threaded Fasteners Bolts

Threaded Fasteners Bolts

Threaded Fasteners Bolts When a bolt is used to join 2 or more parts the holes are drilled just large enough for the bolt to slide through them. A nut is then screwed onto the bolt and tightened.

Threaded Fasteners Bolts

Threaded Fasteners Bolts have to be able to resist 2 main forces: n n Shear Tension

Threaded Fasteners Shear If the parts being joined have a tendency to slide over each other, the bolt will have to be strong enough to resist shear.

Threaded Fasteners Shear

Threaded Fasteners Tension If the parts have a tendency to pull apart the bolt will have to resist tension. The bolt must also resist tension when the nut is tightened onto it.

Threaded Fasteners Tension

Threaded Fasteners Bolts are available with various shapes of head such as hexagonal, square and round.

Threaded Fasteners Bolts are specified by their diameter, type of thread, length, material, finish and shape of head. E. G. : M 10 x 50 mm long, Mild Steel, Sherardised and Hexagonal Head.

Threaded Fasteners Studs are threaded at both ends. One end is passed through a clearance hole in one part and screwed into a tapped hole in the main component a nut is screwed onto the end to tighten the parts together.

Threaded Fasteners Studs

Threaded Fasteners Studs

Threaded Fasteners Nuts are made with an internal screw thread to match the thread on a screw, bolt or stud. They are usually hexagonal or square in shape.

Threaded Fasteners Nuts

Threaded Fasteners Nuts Wing nuts are tightened and loosened by hand so therefore they are only suitable where the degree of tightness achieved is not of vital importance e. g. tensioning hacksaw blades.

Threaded Fasteners Wing Nuts

Threaded Fasteners Nuts Special locking nuts are sometimes used to prevent loosing by vibration. They include: n A thin nut used with a plain nut n A castle or slotted nut used with a split pin n A nut with a nylon or fibre insert

Threaded Fasteners Locking Nuts

Threaded Fasteners Locking Nuts

Threaded Fasteners Locking Nuts

Threaded Fasteners Locking Nuts

Threaded Fasteners Locking Nuts

Threaded Fasteners Locking Nuts

Threaded Fasteners Washers Plain washers are commonly used under nuts, bolts and screws.

Threaded Fasteners Plain Washers

Threaded Fasteners Plain Washer

Threaded Fasteners Washers There are 2 reasons for their use: 1. To prevent the corners of the nut, bolt or screw from scratching the surface of the component. 2. To distribute the load exerted by the nut, bolt or screw over a larger area.

Threaded Fasteners Washers are also used as locking devices, examples of these are: n Spring washers n Toothed washers n Tab washers

Threaded Fasteners Spring Washer

Threaded Fasteners Spring Washer

Threaded Fasteners Toothed Washer

Threaded Fasteners Toothed Washer

Threaded Fasteners Tab Washer

Threaded Fasteners Tab Washer

Threaded Fasteners Tab Washer