{"product_id":"m3-5-x-35mm-raised-head-countersunk-electrical-screw-100-pack","title":"M3.5 x 35mm Raised Head Countersunk Electrical Screw - 100 Pack","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThese M3.5 x 35mm raised head countersunk screws are designed for electrical installations, specifically for fixing faceplates to metal back boxes, securing switches to mounting frames, and general electrical accessory assembly. The 35mm length provides sufficient thread engagement for standard 25mm back boxes plus the thickness of a faceplate sub-frame, while the countersunk profile sits flush with or just below the surface of drilled mounting holes.\u003c\/p\u003e\n\u003cp\u003eSupplied in a 100-pack polybag, these screws are intended for electricians and installers working on residential or commercial electrical fitouts where multiple sockets, switches or accessories need fixing. The M3.5 thread diameter is the standard size for UK electrical accessory mounting holes, fitting the pre-drilled apertures in Knightsbridge and most other manufacturers' metal sub-frames and back boxes without tapping.\u003c\/p\u003e\n\u003cp\u003eThe nickel plating provides corrosion resistance for installations in bathrooms, kitchens and other moisture-prone areas where plain steel screws would rust over time. The raised head profile gives a larger bearing surface than a standard flat countersunk screw, distributing load across the faceplate material and reducing the risk of pulling through thin plastic or metal covers during tightening.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e3.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_2487910_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are these screws used for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThey fix electrical accessory faceplates to metal back boxes and sub-frames during socket, switch and dimmer installation. The M3.5 thread diameter is the UK standard for electrical accessory mounting holes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill 35mm be long enough for my installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA 35mm screw works with a standard 25mm back box plus a typical screwless sub-frame (3-5mm) and faceplate (2-3mm). For deeper installations or surface-mounted boxes, a longer screw may be needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre they compatible with all brands of back box?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. M3.5 is the standard thread size for UK electrical accessory mounting holes across Knightsbridge, MK, BG Electrical and other major brands.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the advantage of the raised head over flat countersunk?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe raised head has a larger bearing surface, which spreads the load across the faceplate material and reduces the risk of the screw pulling through during tightening, particularly with thin plastic or metal covers.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293780533515,"sku":"CSCREW35","price":4.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/158852_bc643ee0-0ded-4c52-aaf1-4419bdef6c96.jpg?v=1714664032","url":"https:\/\/niori.co.uk\/products\/m3-5-x-35mm-raised-head-countersunk-electrical-screw-100-pack","provider":"Niori","version":"1.0","type":"link"}