Chipboard screws are a coarse thread timber screw with a countersunk flat head and ribs under the head that self embed with the timber surface for a flush or countersunk finish. The screw provides maximum grip and minimum stripout into chipboard MDF other composite and soft timbers. It is recommended to drill a pilot hole into some hardwoods so if possible test on an outcut as performance and outcome vary depending on the type of timber and age. It is aesthetically pleasing to the eye and very practical because of its excellent corrosion protection in most environments. It is highly recommended to use a Bugle Batten screw in Stainless Steel A4-70 G316 if the product will be used within 300 metres of the coast in the food and chemical industry or within salt spray affected areas. Most products can be identified by the following markings: A2 A2-70 304 or G304. Stainless steels are largely non-magnetic but it is common for stainless steel fasteners to show a small degree of magnetism which is a result of work-hardening during the manufacturing process Can Stainless corrode?: Stainless steel is corrosion-resistant but not corrosion-proof and corrosion can occur if the material is installed or handled incorrectly. The use of tools and drills made from conventional steel during the installation of stainless steel fasteners may also lead to problems. Even the hardest of tools can produce debris that leaves minute steel particles on the stainless steel fastener surfaces or in pre-drilled holes. It is these particles that often rust when exposed to moisture or oxygen and can result in a stained or tarnished finish to the stainless steel material What does TPI stand for?: TPI stands for “threads per inch” which literally means the number of threads within each inch on a screw a bolt or a fastener. To determine the TPI of a screw count the number of threads contained within an inch of length on the fastener. If the screw is less than an inch count ½” of an inch and multiply by 2 How to measure the length of a Timber Screw: Fastener length is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener. Thus fasteners with heads that sit above the surface are measured from under the head to the end of the fastener while fasteners that sit flush with the surface are measured from the top of the head to the end of the fastener Thread Length: have been included as a guide only. Due to stock being sourced from multiple suppliers variations do exist. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.