Please note that the head shape can vary between a countersunk, double countersunk, and bugle shape. A countersunk hole is used for flat head fasteners which have a flat top face and then a taper down from the top face.

A machine screw is a type of screw that is commonly used in industrial and manufacturing applications to secure components within engines, electronic products and general machinery. This section of our guides and tips hub contains a library of helpful articles such as guides to using screws, screw specification sheets and product reviews on different types of screws such as woodscrews, self tapping screws and decking screws. use in applications such as access panels, number plates and many anti-vandalism securing solutions. For example, an ISO M10 flat head screw with a normal fit countersunk hole will require a pilot hole diameter of 11 mm, a countersunk diameter of 22. General purpose wood screws with a Torx drive; also known as star, 6 lobe, and hexalobular internal.Use the image and chart below to determine what dimensions to use, all dimensions are in millimetres apart from the countersink angle. Countersunk machine screws are designed for installation in countersunk holes to enable them to sit flush within the finished surface. Westfield Fasteners Limited is a company registered in England and Wales with company number 07215583. A popular choice for carpenters and joiners when joining one piece of material to another, making a strong fixing.

They are used when the top of a screw or bolt needs to be flush with the surface of the material it is inserting. Countersunk machine screws have a circular head with a flat top and a PZ recess which enables them to be screwed flush to the material they being used with. If you can't find the information you are looking for here, please don't hesitate to get in contact with us!Zinc Flake coated high tensile steel class 10 - a higher tensile non-stainless grade for screws and bolts. The torx drive is designed to prevent "cam out", which makes them ideal for use with modern drill/drivers. UNBRAKO® branded and manufactured to be stronger than the other size for size high tensile versions.

For example, M4 x 30 means that the major thread diameter (the external distance across the outside of the thread) is 4mm and the length is 30mm. For example, an ANSI Metric M6 flat head screw with a normal fit countersunk hole will require a pilot hole diameter of 6.Zinc Flake coated high tensile steel class 12 - a higher tensile non-stainless grade for screws and bolts. that due to the nature of the surface finish on Unbrako products, some surface corrosion may be evident. Generally used in timber to timber and timber to metal construction, these bolts incorporate a square neck to grip the hole in the timber when fitting, and therefore negates the need for any drive recess to be included on top of the head.