{"product_id":"self-tapping-screws","title":"Countersunk Self-Tapping Screws No.4–12 — A4 316 Marine","description":"\u003ch3\u003eWhy choose these A4 marine countersunk self-tapping screws\u003c\/h3\u003e\n\u003cp\u003eCountersunk (flat) head self-tapping screws in A4 marine grade 316 stainless steel — driven with a Phillips bit, they sink flush into a countersunk hole for a clean finished surface. The hardened thread cuts its own mate as you drive, working in timber, drywall, plastic and thin sheet without a tapping operation. A4 stainless resists saltwater and chloride attack, so they keep their finish in marine, coastal and outdoor jobs.\u003c\/p\u003e\n\u003ch3\u003eSizes available\u003c\/h3\u003e\n\u003cp\u003eFive gauges — No.4, No.6, No.8, No.10 and No.12 — across ten length options from 13mm up to 80mm. Choose a length that lets the threaded portion fully engage into the second piece of material for a strong joint.\u003c\/p\u003e\n\u003ch3\u003ePack option\u003c\/h3\u003e\n\u003cp\u003eSupplied in packs of 20 per size. Mix sizes in one checkout to qualify for free UK delivery on orders over £20.\u003c\/p\u003e\n\u003ch3\u003eTypical uses\u003c\/h3\u003e\n\u003cp\u003eBoat fit-outs and cabin trim, outdoor furniture, decking trim, soffit and fascia work, drywall and panelling, plywood and hardwood joinery, garden machinery, signage and any surface where a flush-fitting stainless screw is needed.\u003c\/p\u003e\n\u003ch3\u003eHow to fit\u003c\/h3\u003e\n\u003cp\u003eCounterbore the top piece with a countersink bit so the screw head sits flush, then pilot-drill the second piece to the recommended size for the gauge (usually around 0.7× the screw OD for sheet; slightly smaller in hardwood). Drive with a Phillips bit of the correct size (PH2 for most sizes, PH3 for No.12) keeping the bit fully seated to avoid rounding the recess.\u003c\/p\u003e\n\u003ch3\u003eDelivery\u003c\/h3\u003e\n\u003cp\u003eSame-day dispatch on orders placed before 2pm — free UK delivery on orders over £20.\u003c\/p\u003e","brand":"Universal Hardware","offers":[{"title":"13mm \/ No.4","offer_id":54688957563217,"sku":"FAS-TAPSCR-A4-CSK-13MM-NO-4","price":4.99,"currency_code":"GBP","in_stock":true},{"title":"19mm \/ No.4","offer_id":54688957595985,"sku":"FAS-TAPSCR-A4-CSK-19MM-NO-4","price":3.95,"currency_code":"GBP","in_stock":true},{"title":"25mm \/ No.4","offer_id":54688957628753,"sku":"FAS-TAPSCR-A4-CSK-25MM-NO-4","price":5.25,"currency_code":"GBP","in_stock":true},{"title":"32mm \/ No.4","offer_id":54688957661521,"sku":"FAS-TAPSCR-A4-CSK-32MM-NO-4","price":5.6,"currency_code":"GBP","in_stock":true},{"title":"13mm \/ 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