{"product_id":"bilitools-5-16-18-thread-repair-kit-sae-helicoil-hss-drill-304-stainless-inserts-in-iron-case","title":"BILITOOLS 5\/16-18 Thread Repair Kit – SAE Helicoil HSS Drill \u0026 304 Stainless Inserts in Iron Case","description":"\u003cp\u003e\u003cstrong\u003eBILITOOLS 5\/16-18 HSS Helicoil Thread Repair Kit is a complete SAE thread-restoration set designed to repair stripped or damaged internal threads and install durable 304 stainless inserts for stronger, longer-lasting threads.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhether you're fixing a stripped bolt hole in an engine block, renewing threads in a plumbing fitting, or reinforcing fasteners in softer metals, this kit brings the drill, tap, installation tools, and stainless-steel Helicoil-style inserts needed to restore function quickly. All components are arranged in a compact iron case so you can carry the set to the shop or a job site and keep pieces organized between jobs.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this kit restore stripped or damaged threads?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit follows a standard thread-repair workflow: drill out the damaged thread to the correct diameter, tap a new thread sized for the insert, install a corrosion-resistant 304 stainless insert, and remove the installation tang to leave a proper internal thread. The included HSS drill and tap are ground with a 135° apex for aggressive cutting and efficient penetration through most materials.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHSS drill matched to 5\/16-18 SAE repair size for clean removal of damaged material.\u003c\/li\u003e\n  \u003cli\u003ePrecision tap to cut the new internal thread for the insert.\u003c\/li\u003e\n  \u003cli\u003e304 stainless inserts restore thread strength and resist corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstallation tool and break-off pin tool make insert seating and tang removal straightforward.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and applications are supported by this repair set?\u003c\/h3\u003e\n\n\u003cp\u003eThis kit is suitable for use in metals, composites, and many polymers, making it versatile for automotive, plumbing, machinery, and general maintenance work. The 304 stainless inserts are particularly useful when you need increased torque capacity or improved wear resistance in weaker base materials.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eAutomotive: engine blocks, cylinder heads, intake manifolds.\u003c\/li\u003e\n  \u003cli\u003ePlumbing: metal pipe fittings and threaded housings.\u003c\/li\u003e\n  \u003cli\u003eIndustrial: machinery frames, gear housings, and soft-metal mounts.\u003c\/li\u003e\n  \u003cli\u003eHobby and repair: marine, lawn equipment, and household hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat tools and parts come in the kit, and how are they organized?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit arrives as a curated set of essential tools and inserts for the 5\/16-18 SAE size, packed into a durable iron case. Everything you need for a complete repair job is included so you don’t have to source individual components separately.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHigh-speed steel (HSS) drill with 135° apex for efficient cutting.\u003c\/li\u003e\n  \u003cli\u003eTap sized to accept the stainless thread insert for reliable seating.\u003c\/li\u003e\n  \u003cli\u003e304 stainless helicoil-style thread inserts for durable internal threads.\u003c\/li\u003e\n  \u003cli\u003eInstallation tool, break-off pin tool, and organized iron storage case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I choose the right size and prepare before buying?\u003c\/h3\u003e\n\n\u003cp\u003eConfirm the existing fastener size and thread pitch to ensure compatibility with the 5\/16-18 SAE specification in this set. If you’re unsure which size you need, consult the kit’s diagram (refer to picture 6 in product images) or measure the fastener and thread pitch before purchase to avoid mismatches.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMeasure bolt diameter and count threads per inch (TPI) to verify 5\/16-18 fit.\u003c\/li\u003e\n  \u003cli\u003eUse the diagram included in the product images for guidance on sizing and installation steps.\u003c\/li\u003e\n  \u003cli\u003ePre-clean the damaged hole to remove debris, oils, and corrosion for best results.\u003c\/li\u003e\n  \u003cli\u003eWork slowly through drill and tap steps to avoid over-removing base material.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The BILITOOLS 5\/16-18 HSS Helicoil Thread Repair Kit is aimed at professional mechanics, maintenance technicians, and hobbyists who regularly encounter stripped or worn internal threads and need a reliable, portable solution. If you work on cars, machines, plumbing, or metal assemblies where restored torque capacity and corrosion resistance matter, this set provides the tools and stainless-steel inserts required for professional-grade repairs.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this kit work for aluminum and cast iron?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The HSS drill and tap plus 304 stainless inserts are suited for aluminum, cast iron, and many other metals and composites.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include the installation and tang-break tools?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The set includes an install tool and a break pin tool to seat inserts and remove tangs for finished threads.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BILITOOLS","offers":[{"title":"Default Title","offer_id":55161972883799,"sku":"B09WN6M8VN","price":30.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/bilitools-front-open-case.jpg?v=1790334354","url":"https:\/\/britishgarage.co.uk\/products\/bilitools-5-16-18-thread-repair-kit-sae-helicoil-hss-drill-304-stainless-inserts-in-iron-case","provider":"British Garage","version":"1.0","type":"link"}