{"product_id":"3-8-thick-4-125-od-round-aluminum-tapped-pad-5-16-18-unc-thread-marine-grade-6061-t6","title":"3\/8\" Thick 4.125\" OD Round Aluminum Tapped Pad | 5\/16\"-18 UNC Thread | Marine Grade 6061-T6","description":"\u003cp style=\"font-size:1.15em;line-height:1.4;margin-bottom:0.75em;text-transform:none;color:#4a7ab5\"\u003e\u003cstrong\u003e4.125\" OD Round Aluminum Tapped Pad — 5\/16\"-18 UNC Thread\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"font-weight:400;font-size:0.9em\"\u003ePrecision CNC-machined 6061-T6 aluminum round tapped pad with a single 5\/16\"-18 UNC threaded hole. Designed to receive a threaded fastener directly — no nut required on the back side. Commonly used where a threaded mounting point is needed on a fiberglass deck surface, radar arch, or T-top assembly in saltwater marine environments.\u003c\/p\u003e\n\n\u003ctable style=\"font-size:0.9em;border-collapse:collapse\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003eMarine Grade 6061-T6 Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003e4.125\" (105 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003e3\/8\" (0.375\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eThreaded Hole\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003e1 (5\/16\"-18 UNC tapped)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eShape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003eMatte — tumbled, deburred, paint\/powder coat ready\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#1a1a1a;text-transform:none;color:#ffffff;border:1px solid #ffffff\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"font-weight:400;border:1px solid #ffffff\"\u003e0.56 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"text-transform:none;font-weight:600;font-size:1.05em;color:#4a7ab5\"\u003eCommon Applications\u003c\/p\u003e\n\u003cp style=\"font-weight:400;font-size:0.9em\"\u003eT-tops, tuna towers, hard tops, radar arches, leaning posts, grab bars, bow rails, outrigger mounts, rod holders — anywhere a threaded mounting point is needed on a fiberglass or aluminum surface.\u003c\/p\u003e\n\n\u003cp style=\"text-transform:none;font-weight:600;font-size:1.05em;color:#4a7ab5\"\u003eFrequently Asked Questions\u003c\/p\u003e\n\n\u003cp style=\"font-weight:400;font-size:0.9em\"\u003e\u003cstrong\u003eWhat is a tapped pad?\u003c\/strong\u003e\u003cbr\u003e\nA tapped pad has internal threads cut into its hole so a fastener screws directly into the pad — no nut or backing plate required on the opposite side. This makes it ideal for single-sided access installations.\u003c\/p\u003e\n\n\u003cp style=\"font-weight:400;font-size:0.9em\"\u003e\u003cstrong\u003eWhat size fastener does this pad accept?\u003c\/strong\u003e\u003cbr\u003e\nThe tapped hole is 5\/16\"-18 UNC — use a 5\/16\"-18 stainless bolt or machine screw for a secure threaded fit.\u003c\/p\u003e\n\n\u003cp style=\"font-weight:400;font-size:0.9em\"\u003e\u003cstrong\u003eCan I use this on a fiberglass deck?\u003c\/strong\u003e\u003cbr\u003e\nYes — the pad distributes fastener load across a wider surface area, preventing pull-through or deck damage. Thread the bolt into the pad from the exterior side; the pad threads hold it securely.\u003c\/p\u003e\n\n\u003cp style=\"font-weight:400;font-size:0.9em\"\u003e\u003cstrong\u003eHow is this different from a backing plate?\u003c\/strong\u003e\u003cbr\u003e\nA backing plate has straight through-holes and requires a nut on the back side. A tapped pad has internal threads — the fastener screws into the pad itself, so no back-side nut is needed.\u003c\/p\u003e\n\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"name\": \"3\/8\" Thick 4.125\" OD Round Aluminum Tapped Pad | 5\/16\"-18 UNC Thread | Marine Grade 6061-T6\",\n      \"sku\": \"1009\",\n      \"mpn\": \"1009\",\n      \"brand\": {\n        \"@type\": \"Brand\",\n        \"name\": \"Welding World\"\n      },\n      \"description\": \"4.125 inch round aluminum tapped pad with 5\/16-18 UNC threaded hole. 3\/8 inch thick, 6061-T6, for threaded mounting on fiberglass decks.\",\n      \"material\": \"Aluminum 6061-T6\",\n      \"category\": \"Marine Deck Hardware\",\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"price\": \"12.00\",\n        \"priceCurrency\": \"USD\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\n          \"@type\": \"Organization\",\n          \"name\": \"Welding World\"\n        }\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is a tapped pad?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"A tapped pad has internal threads cut into its hole so a fastener screws directly into the pad — no nut or backing plate required on the opposite side.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What size fastener does this pad accept?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"The tapped hole is 5\/16-18 UNC — use a 5\/16-18 stainless bolt or machine screw for a secure threaded fit.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can I use this on a fiberglass deck?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Yes — the pad distributes fastener load across a wider surface area, preventing pull-through or deck damage.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How is this different from a backing plate?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"A backing plate has straight through-holes and requires a nut on the back side. 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