{"product_id":"johns-manville-extra-high-load-21-phillips-membrane-fasteners-6-in-or-8-in","title":"Johns Manville Extra High Load #21 Phillips Membrane Fasteners, 6 in. or 8 in.","description":"\u003ch1\u003eJohns Manville Extra High Load #21 Phillips Membrane Fasteners, 6 in. or 8 in.\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eJohns Manville Extra High Load fasteners are case-hardened steel, corrosion-resistant coated #21 screws with a #3 Phillips head and drill point, made to mechanically attach thermoplastic membranes. Choose 6 in. (500\/box) or 8 in. (250\/box). Pair them with the 3 in. galvalume-coated Extra High Load Plate with eye hooks.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh pullout capacity:\u003c\/strong\u003e Extra High Load #21 wire size fasteners are designed for high-load mechanical attachment of thermoplastic membranes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill point tip:\u003c\/strong\u003e Each screw has a drill point for fast penetration into steel decks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhillips drive:\u003c\/strong\u003e #3 Phillips head accepts standard roofing screw guns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-resistant coating:\u003c\/strong\u003e Fasteners are coated for corrosion resistance; black fasteners with gray plates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching 3 in. plate:\u003c\/strong\u003e The Extra High Load Plate is 3 in. round galvalume-coated steel with eye hooks and an oversized hole for the larger wire size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo lengths:\u003c\/strong\u003e Available in 6 in. boxes of 500 and 8 in. boxes of 250 to match deck and insulation thickness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch2\u003eSpecifications Table:\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJohns Manville\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSell unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 box (500 for 6 in., 250 for 8 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJM Extra High Load membrane fasteners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 in. #21 (500\/box); 8 in. #21 (250\/box)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGauge\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e#21 wire size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFastener: case-hardened steel; Plate: galvalume-coated steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e#3 Phillips head with drill point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePlate size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 in. (7.6 cm) round with eye hooks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor \/ finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack fasteners, gray plates; corrosion-resistant coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack quantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500 per box (6 in.) or 250 per box (8 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMechanical attachment of thermoplastic membranes to steel decks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch2\u003eCoverage \u0026amp; How Much You Need:\u003c\/h2\u003e\u003cp\u003eA box of 6 in. fasteners (500) or 8 in. fasteners (250) covers field rows at your specified fastener density; divide the required fastener count by the box quantity to size ordering. Plates are ordered separately to match.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eDesigned for mechanical attachment of thermoplastic membranes with the matching JM Extra High Load 3 in. plate, which has an oversized hole to accept the larger #21 wire size. Plates are sold separately; verify deck thickness before choosing 6 in. versus 8 in. length.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What sizes are available?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Two variants: 6 in. #21 fasteners, 500 per box, and 8 in. #21 fasteners, 250 per box.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What is included?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One box of fasteners only; the 3 in. Extra High Load Plate is sold separately.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What membranes do they attach?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e They are used to mechanically attach thermoplastic membranes such as TPO.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What driver do I need?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The screws use a #3 Phillips head; use a compatible screw gun with depth-setting clutch.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What plate do I pair with them?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The JM Extra High Load Plate, a 3 in. galvalume-coated steel round with eye hooks and an oversized hole for the #21 wire.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Are they corrosion resistant?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the fasteners carry a corrosion-resistant coating, and the plates are galvalume-coated steel.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eChoose the 6 in. screw for thinner insulation stacks and the 8 in. screw where thicker assemblies require deeper embedment into steel deck. Because the #21 wire is larger than standard fasteners, always pair with the Extra High Load Plate so the hole accommodates the wire, and run installation torque tests to set clutch depth before production fastening.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eWear eye protection when fastening and verify fastener penetration through the deck from below before full installation.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder JM Extra High Load #21 Phillips fasteners in 6 in. or 8 in. boxes for high-load membrane attachment.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Johns Manville","offers":[{"title":"6\" #21 500\/Box","offer_id":53524444545391,"sku":"JM70000119","price":526.0,"currency_code":"USD","in_stock":true},{"title":"8\" #21 250\/Box","offer_id":53524444578159,"sku":"JMF218P","price":418.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/JM70000119_0.jpg?v=1790284167","url":"https:\/\/superarbor.io\/products\/johns-manville-extra-high-load-21-phillips-membrane-fasteners-6-in-or-8-in","provider":"Super Arbor","version":"1.0","type":"link"}