Button Post Torx barrel nuts are an internally threaded nut with a button head post torx drive that provides maximum security in some many applications. Ideal for clamping where both sides are visible. Completely encloses the thread which results in a neat safe finish. For best results use with a post torx drive security machine screw. Extremely popular in the playground equipment also used in architectural joinery features with glass steel and timber materials using a channel design in overhead or vertical panels Also known as: Interscrews Chicago Screws Material / Coating: Stainless Steel A2-70 G304 is the most popular grade of stainless steel. It is aesthetically pleasing to the eye and very practical because of its excellent corrosion protection in most environments. Most products can be identified by the following markings: A2 A2-70 304 or G304 but not all nuts are stamped. Stainless steels are largely non-magnetic but it is common for some 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 Galling: can occur when excessive pressure is used to tighten a nut onto a thread common with stainless fasteners but can also be an issue with other materials. Fasteners with damaged or fine threads are particularly prone to galling. Some suggestions to help prevent thread galling: Tightening the nut more slowly without excessive pressure will frequently reduce or sometimes solve completely the problem. As the installation RPM speed increases the heat generated with friction during tightening escalates the chances of thread galling. Reduce the friction by applying a suitable lubricant to the thread frequently eliminates thread galling. Typical lubricants are chloride-paraffine molykoat lacquer molybdenum disulphide high pressure oil graphite mica or talc some assemblies where there is extreme pressure corrosion resistant grease or waxes may also be effective Thread Pitch (Metric): is the distance between the peaks of two threads along a screw bolt nut or fastener expressed in millimetres (mm). Used when referring to Metric parts. 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.