{"product_id":"m3-5-x-50mm-flat-head-countersunk-electrical-screw-nickel-100-pack","title":"M3.5 x 50mm Flat Head Countersunk Electrical Screw - Nickel (100 Pack)","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThese M3.5 x 50mm flat head countersunk screws are machine screws designed for electrical installation work, supplied in packs of 100. The 3.5mm diameter thread pairs with the fixing holes in Knightsbridge screwless socket sub-frames, flat plate accessories and similar electrical fittings where the screw head must sit flush or below the mounting surface.\u003c\/p\u003e\n\u003cp\u003eThe countersunk head tapers at an 82-degree angle, allowing it to sit flush with the surface once driven home. This is critical for screwless installations where the cover plate clips over the sub-frame — any raised screw heads would prevent the plate from fitting correctly. The 50mm length provides sufficient thread engagement for mounting accessories to standard 25-35mm back boxes through plasterboard or onto solid wall surfaces.\u003c\/p\u003e\n\u003cp\u003eThe nickel-plated finish provides corrosion resistance in indoor environments and a neutral metallic appearance that blends with chrome, stainless and brushed finishes commonly found on electrical accessories. Each screw is threaded along its full shank, allowing adjustment of how far the screw protrudes into the back box. The pack of 100 suits professional electricians, facilities managers and trade installers working on multi-room socket and switch installations.\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\u003e50 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_5436295_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 are designed for fixing electrical accessories to back boxes, particularly screwless socket and switch installations where the screw head must sit flush or below the mounting surface to allow the cover plate to clip on correctly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre they compatible with Knightsbridge screwless ranges?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The M3.5 diameter and countersunk head are the standard specification for Knightsbridge screwless sub-frames and similar accessories requiring flush-mounted fixings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat back box depth do they suit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 50mm length provides sufficient thread for mounting accessories to standard 25-35mm back boxes through plasterboard or onto solid wall surfaces. Longer screws may be required for deeper back boxes or thicker wall finishes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many screws are in a pack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEach pack contains 100 screws, which is sufficient for approximately 25-50 socket or switch installations depending on the number of fixing points per accessory.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293682393355,"sku":"CSCREW50FN","price":4.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/1244262_f4bf73c0-4adc-4ee9-959b-7288f12b8c53.jpg?v=1714662488","url":"https:\/\/niori.co.uk\/products\/m3-5-x-50mm-flat-head-countersunk-electrical-screw-nickel-100-pack","provider":"Niori","version":"1.0","type":"link"}