{"product_id":"k2-2003527","title":"K2 Self-Drilling Screw 6.8x140mm with Mounted Sealing Washer","description":"\u003c!-- clearray-added-v1 --\u003e\n\u003cdiv class=\"crx\"\u003e\n\u003cp class=\"crx-lede\"\u003eAt \u003cb\u003e140 mm\u003c\/b\u003e this is one of the longest fixings in the K2 range, and the length is the whole point. It reaches through batten and counter-batten and still lands in the rafter below, so the fixing is in structure rather than in boarding.\u003c\/p\u003e\n\u003cp class=\"crx-lede\"\u003eIt is \u003cb\u003eself-drilling\u003c\/b\u003e, with the \u003cb\u003esealing washer already mounted\u003c\/b\u003e – one part, one operation, and no separate washer to drop off a roof.\u003c\/p\u003e\n\n\u003ch3 class=\"crx-h\"\u003eWhen the length matters\u003c\/h3\u003e\n\u003cp\u003eOn a re-roofed or heavily battened roof the distance from the surface to solid timber can be considerably more than the hook base allows for with a standard screw. A short fixing in that situation grips battens rather than rafter, which is exactly the fixing that pulls out under uplift.\u003c\/p\u003e\n\u003cp\u003eWhere the build-up is unknown, probe it before ordering. The right screw length is a function of the roof construction, not of the mounting system.\u003c\/p\u003e\n\n\u003ch3 class=\"crx-h\"\u003eOrder alongside\u003c\/h3\u003e\n\u003cul class=\"crx-need\"\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/k2-2003215\"\u003eK2 Roof Hook SingleHook 3S\u003c\/a\u003e\n      \u003cp\u003eA pitched-roof hook these screws fix down through the batten line.\u003c\/p\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/k2-1000096\"\u003eK2 Roof Fastener for Pan Tiles\u003c\/a\u003e\n      \u003cp\u003eThe pan tile fastener, where the roof covering is profiled rather than flat.\u003c\/p\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/k2-1000373\"\u003eK2 Roof Fastener Slate\u003c\/a\u003e\n      \u003cp\u003eThe slate equivalent, for a slated roof.\u003c\/p\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/k2-1005193\"\u003eK2 Self-Tapping Screw 6x38mm (Pack of 500)\u003c\/a\u003e\n      \u003cp\u003eThe short sheet-metal screw for trapezoidal roofs, in the trade pack.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 class=\"crx-h\"\u003eQuestions on the 6.8x140 screw\u003c\/h3\u003e\n\u003cdiv class=\"crx-qa\"\u003e\n  \u003cdiv\u003e\n\u003cb\u003eWhy 140 mm?\u003c\/b\u003e\n    \u003cp\u003eTo pass through batten and counter-batten and still get a useful bite into the rafter. On a simple build-up a shorter screw is enough.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eIs the washer supplied?\u003c\/b\u003e\n    \u003cp\u003eYes, mounted on the screw already. There is no separate washer to fit.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eDoes it need a pilot hole?\u003c\/b\u003e\n    \u003cp\u003eIt is self-drilling. Follow K2's guidance for the substrate you are fixing into.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv\u003e\n\u003cb\u003eHow do I know what length I need?\u003c\/b\u003e\n    \u003cp\u003eMeasure the roof build-up from the surface to the top of the rafter. That, not the mounting system, decides the screw.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"K2","offers":[{"title":"Default Title","offer_id":59131025064268,"sku":"K2-2003527","price":1.26,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1048\/7742\/4972\/files\/K2-2003527.jpg?v=1791560722","url":"https:\/\/clearraysolar.com\/products\/k2-2003527","provider":"ClearRay Solar","version":"1.0","type":"link"}