{"product_id":"porsche-356-door-backing-plate-laser-cut-steel-w-welded-captive-nuts-washburns-original","title":"Porsche 356 Door Hinge Backing Plate | All 356 1950–1965 | Laser-Cut Steel w\/ Welded Nuts (#BY06)","description":"\u003ch2\u003e\u003cb\u003ePorsche 356 Door Hinge Backing Plate | All 356 Models 1950–1965\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003eRestore solid, threaded hinge mounting points in your 356.\u003c\/b\u003e This threaded backing plate sits behind the door hinge and gives the hinge bolts a rigid, flat anchor. Originals are often rusted thin, cracked, or have stripped threads after decades of door cycles — a weak backing plate is a common cause of sagging doors and poor door gaps.\u003c\/p\u003e\n\u003cp\u003eEach plate is laser-cut at Washburn's Metal and fitted with four welded captive nuts, so the fasteners won't spin when you torque the hinge down. The large center clearance hole matches the original layout. Replaces Porsche part number 644-531-310-00.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eVehicle Fitment\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003ePorsche 356 (all models):\u003c\/b\u003e 1950–1965, including Pre-A, 356A, 356B, and 356C — Coupe, Cabriolet, Roadster, and Speedster.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReplaces:\u003c\/b\u003e 644-531-310-00.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eKey Features \u0026amp; Benefits\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eFour Captive Nuts:\u003c\/b\u003e Welded in place so they won't spin or break loose during door hanging and adjustment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision Cut:\u003c\/b\u003e Laser-cut plate with clean edges, radiused corners, and an accurately placed center hole.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWeld-In Ready:\u003c\/b\u003e Supplied as bare metal, ready to be welded into place during your door or hinge-pillar repair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFixes Door Sag at the Source:\u003c\/b\u003e A solid hinge anchor is the foundation for correct door alignment and gaps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial:\u003c\/b\u003e Steel plate with welded nuts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturing:\u003c\/b\u003e Laser-cut, welded.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFinish:\u003c\/b\u003e Raw \/ bare metal (weld heat tint visible).\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReference Part Number:\u003c\/b\u003e 644-531-310-00.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eQuantity:\u003c\/b\u003e Sold individually.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eFrequently Asked Questions\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eWhich 356 models does this fit?\u003c\/b\u003e All Porsche 356 models from 1950–1965.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDoes it come painted?\u003c\/b\u003e No — it is supplied bare so it can be welded in. Prime or coat it before final assembly for corrosion protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHow many do I need?\u003c\/b\u003e One per hinge location you are repairing — order as many as your job requires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAny tips for install?\u003c\/b\u003e Chase the threads with a tap after paint or seam sealer so the hinge bolts start cleanly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cb\u003eExplore Related Categories\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eRebuilding 356 doors? Browse more \u003ca href=\"\/collections\/body-panels\"\u003eBody Panels\u003c\/a\u003e, \u003ca href=\"\/collections\/hardware\"\u003eHardware\u003c\/a\u003e, and Porsche 356 parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e⚠ WARNING (California Proposition 65):\u003c\/strong\u003e This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to \u003ca href=\"https:\/\/www.p65warnings.ca.gov\"\u003ewww.p65warnings.ca.gov\u003c\/a\u003e. Parts are legal for use on pre-pollution-controlled vehicles only.\u003c\/p\u003e","brand":"Washburn's Metal","offers":[{"title":"Default Title","offer_id":66743207100531,"sku":"#BY06","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/2760\/1523\/files\/IMG_5988_9e8559d3-995c-46ff-8ed4-111d1b0cb565.png?v=1790699885","url":"https:\/\/www.washburnsmetal.com\/products\/porsche-356-door-backing-plate-laser-cut-steel-w-welded-captive-nuts-washburns-original","provider":"Washburn's Metal","version":"1.0","type":"link"}