{"product_id":"4mm-x-25mm-double-countersunk-chipboard-screws-box-of-200","title":"4mm x 25mm Double Countersunk Chipboard Screws | Box of 200","description":"\u003c!-- SEO Product Name: Tekwarm 4mm x 25mm Double Countersunk Chipboard Screws | Box of 200 --\u003e\n\u003cdiv style=\"font-size:16px; max-width:900px; margin:0 auto; color:#222222; line-height:1.6;\"\u003e\n\u003cp style=\"margin:0 0 12px 0;\"\u003eThe \u003cstrong\u003eTekwarm 4mm x 25mm Chipboard \u0026amp; Woodscrew\u003c\/strong\u003e is a \u003cstrong\u003edouble countersunk, wax lubricated single thread screw\u003c\/strong\u003e for fixing \u003cstrong\u003eoverlay boards over Tekwarm routed chipboard and OSB underfloor heating panels\u003c\/strong\u003e. Each box holds \u003cstrong\u003e200 screws\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px 0;\"\u003eThe \u003cstrong\u003edouble countersunk head\u003c\/strong\u003e reduces the likelihood of head shear and helps the screw sit flush, while the \u003cstrong\u003e40 degree deep single thread\u003c\/strong\u003e gives a secure fixing with high pull-out resistance and the \u003cstrong\u003e25 degree sharp point\u003c\/strong\u003e gives a fast start. At \u003cstrong\u003e25mm\u003c\/strong\u003e long, the screw suits \u003cstrong\u003e9mm overlay boards\u003c\/strong\u003e, leaving 16mm of thread in the panel below.\u003c\/p\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; gap:10px; margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#ffffff; border-radius:8px; padding:14px 10px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e4 x 25mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; margin-top:4px;\"\u003eScrew size\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#ffffff; border-radius:8px; padding:14px 10px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e200\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; margin-top:4px;\"\u003eScrews per box\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#ffffff; border-radius:8px; padding:14px 10px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eDouble\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; margin-top:4px;\"\u003eCountersunk head\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#ffffff; border-radius:8px; padding:14px 10px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003eWax\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; margin-top:4px;\"\u003eLubricated thread\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#ffffff; border-radius:8px; padding:14px 10px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e40°\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; margin-top:4px;\"\u003eDeep single thread\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 130px; background:#008377CF; color:#ffffff; border-radius:8px; padding:14px 10px; text-align:center;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:700; line-height:1.2;\"\u003e25°\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px; margin-top:4px;\"\u003eSharp point\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left:5px solid #B3261E; background:#FDECEA; border-radius:6px; padding:12px 16px; margin:12px 0;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#B3261E; margin-bottom:4px;\"\u003eKeep every screw clear of the heating pipe\u003c\/div\u003e\n\u003cdiv style=\"color:#222222;\"\u003eOverlay screws go in \u003cstrong\u003eafter the pipe is laid\u003c\/strong\u003e. Pre-drill near the channels, position each fixing \u003cstrong\u003eso it cannot touch the pipe below\u003c\/strong\u003e, and keep screws \u003cstrong\u003eat least 50mm away from any pipe run\u003c\/strong\u003e when fixing the Tekwarm 9mm overlay, at maximum 300mm centres.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left:5px solid #B26A00; background:#FFF4E0; border-radius:6px; padding:12px 16px; margin:12px 0;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#B26A00; margin-bottom:4px;\"\u003eMatch the screw length to the overlay thickness\u003c\/div\u003e\n\u003cdiv style=\"color:#222222;\"\u003eUse \u003cstrong\u003e25mm screws for 9mm overlay boards\u003c\/strong\u003e. The Tekwarm 6mm HDF overlay is specified with \u003cstrong\u003e20mm screws (34 per board)\u003c\/strong\u003e, and routed panels are fixed to joists with \u003cstrong\u003e70mm screws\u003c\/strong\u003e. Do not use a screw that is long enough to reach the pipe.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left:5px solid #008377CF; background:#00837714; border-radius:6px; padding:12px 16px; margin:12px 0;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:4px;\"\u003eRecommended for Tekwarm overlay boards\u003c\/div\u003e\n\u003cdiv style=\"color:#222222;\"\u003eFixing screws for \u003cstrong\u003erouted chipboard and OSB systems\u003c\/strong\u003e. Countersink so heads sit flush and the finished surface stays flat for the floor finish.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color:#008377CF; font-size:20px; margin:24px 0 10px 0; border-bottom:2px solid #008377CF; padding-bottom:6px;\"\u003eKey features\u003c\/h3\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; gap:12px;\"\u003e\n\u003cdiv style=\"flex:1 1 250px; border:1px solid #008377CF; border-top:4px solid #008377CF; border-radius:8px; padding:14px; background:#ffffff;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eDouble countersunk head\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#333333;\"\u003e\n\u003cstrong\u003eReduces the likelihood of head shear\u003c\/strong\u003e and assists the completion of countersinking.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 250px; border:1px solid #008377CF; border-top:4px solid #008377CF; border-radius:8px; padding:14px; background:#ffffff;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eWax lubricated\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#333333;\"\u003e\n\u003cstrong\u003eWax lubrication\u003c\/strong\u003e speeds insertion, adds \u003cstrong\u003eextra driving torque\u003c\/strong\u003e and improves resistance to corrosion.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 250px; border:1px solid #008377CF; border-top:4px solid #008377CF; border-radius:8px; padding:14px; background:#ffffff;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003e40° deep single thread\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#333333;\"\u003eA \u003cstrong\u003edeep single thread\u003c\/strong\u003e provides a secure fixing with \u003cstrong\u003ehigh pull-out resistance\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 250px; border:1px solid #008377CF; border-top:4px solid #008377CF; border-radius:8px; padding:14px; background:#ffffff;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003e25° sharp point\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#333333;\"\u003eA \u003cstrong\u003esharp point and single lead\u003c\/strong\u003e give a fast start and improved thread acceptance.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 250px; border:1px solid #008377CF; border-top:4px solid #008377CF; border-radius:8px; padding:14px; background:#ffffff;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eTimber and man-made boards\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#333333;\"\u003eA single thread woodscrew for \u003cstrong\u003etimber and man-made boards\u003c\/strong\u003e, or masonry with a plastic plug.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 250px; border:1px solid #008377CF; border-top:4px solid #008377CF; border-radius:8px; padding:14px; background:#ffffff;\"\u003e\n\u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003e200 per box\u003c\/div\u003e\n\u003cdiv style=\"font-size:15px; color:#333333;\"\u003e\n\u003cstrong\u003eBox of 200\u003c\/strong\u003e covers many overlay boards on larger floors.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color:#008377CF; font-size:20px; margin:24px 0 10px 0; border-bottom:2px solid #008377CF; padding-bottom:6px;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003cdiv style=\"margin-top:14px; border:1px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\n\u003cdiv style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:10px 14px;\"\u003eProduct details\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eBrand\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eTekwarm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eProduct\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eChipboard \u0026amp; Woodscrew, double countersunk\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eSize\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003e4mm x 25mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eQuantity\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003e200 per box\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top:14px; border:1px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\n\u003cdiv style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:10px 14px;\"\u003eScrew features\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eHead\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eDouble countersunk\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eFinish\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eWax lubricated\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eThread\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003e40 degree deep single thread\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003ePoint\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003e25 degree sharp point, single lead\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eSuitable for\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eTimber and man-made boards; masonry with a plastic plug\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top:14px; border:1px solid #008377CF; border-radius:8px; overflow:hidden;\"\u003e\n\u003cdiv style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:10px 14px;\"\u003eUsage with Tekwarm systems\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eIntended use\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eFixing overlay boards over routed chipboard and OSB panels\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eSuited overlay\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003e9mm overlay boards (25mm screw: 9mm board plus 16mm into the panel)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#0083770A; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eFixing pattern\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eMaximum 300mm centres on the 9mm overlay, drilled and countersunk\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; background:#ffffff; padding:9px 14px; border-top:1px solid #00837722;\"\u003e\n\u003cdiv style=\"flex:1 1 200px; font-weight:700; color:#008377CF;\"\u003eClearance from pipe\u003c\/div\u003e\n\u003cdiv style=\"flex:2 1 280px;\"\u003eNo screws within 50mm of any pipe run\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color:#008377CF; font-size:20px; margin:24px 0 10px 0; border-bottom:2px solid #008377CF; padding-bottom:6px;\"\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cdetails style=\"border:1px solid #008377CF; border-radius:8px; margin:8px 0; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 14px; cursor:pointer;\"\u003eWhat are these screws used for?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;\"\u003eThey fix \u003cstrong\u003eoverlay boards\u003c\/strong\u003e over \u003cstrong\u003erouted chipboard and OSB panels\u003c\/strong\u003e once the heating pipe is in place, such as the Tekwarm 9mm moisture resistant overlay board.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #008377CF; border-radius:8px; margin:8px 0; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 14px; cursor:pointer;\"\u003eWhich overlay should I use them with?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;\"\u003eThe \u003cstrong\u003e25mm length suits 9mm overlay boards\u003c\/strong\u003e. The Tekwarm 6mm HDF overlay is specified with \u003cstrong\u003e20mm screws\u003c\/strong\u003e, so choose that length for the 6mm board.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #008377CF; border-radius:8px; margin:8px 0; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 14px; cursor:pointer;\"\u003eHow far apart should I fix the overlay?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;\"\u003eFor the Tekwarm 9mm overlay, drill and countersink the fixings at \u003cstrong\u003emaximum 300mm centres\u003c\/strong\u003e, keeping screws \u003cstrong\u003eat least 50mm from any pipe run\u003c\/strong\u003e and making sure no pipe is pierced.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #008377CF; border-radius:8px; margin:8px 0; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 14px; cursor:pointer;\"\u003eWhy a double countersunk head?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;\"\u003eIt \u003cstrong\u003ereduces the likelihood of head shear\u003c\/strong\u003e and helps you countersink the screw cleanly so the surface stays flat for the floor finish.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #008377CF; border-radius:8px; margin:8px 0; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 14px; cursor:pointer;\"\u003eWhat is the wax lubrication for?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;\"\u003eIt makes the screw \u003cstrong\u003ego in faster with extra driving torque\u003c\/strong\u003e and improves resistance to corrosion.\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #008377CF; border-radius:8px; margin:8px 0; overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF; color:#ffffff; font-weight:700; padding:12px 14px; cursor:pointer;\"\u003eHow many screws are in a box?\u003c\/summary\u003e\u003cdiv style=\"padding:12px 14px;\"\u003eEach box contains \u003cstrong\u003e200 screws\u003c\/strong\u003e.\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Tekwarm","offers":[{"title":"Default Title","offer_id":68386608382342,"sku":"RTCHIP-Screws-200","price":13.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/20mm-chipboard-woodscrews-double-countersunk-4mm-x-20mm.jpg?v=1794128577","url":"https:\/\/qualityheating.co.uk\/products\/4mm-x-25mm-double-countersunk-chipboard-screws-box-of-200","provider":"AIZO Quality Heating","version":"1.0","type":"link"}