{"product_id":"kungjuer-5-16-18-helicoil-thread-repair-kit-30pc-stainless-inserts-hss-tap-drill","title":"KUNGJUER 5\/16-18 Helicoil Thread Repair Kit, 30pc — Stainless Inserts, HSS Tap \u0026 Drill","description":"\u003cp\u003e\u003cstrong\u003eKUNGJUER's 30-piece 5\/16-18 Helicoil thread repair kit supplies every tool and insert needed to restore stripped or damaged SAE threads fast and reliably.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis compact kit is built for rethreading 5\/16-18 inch holes in engines, machinery, and metal assemblies. It gathers a drill, tap, insertion and break-off tools, 25 stainless-steel inserts and a wrench in a protective case so you can repair worn threads on aluminum, iron, steel and other common metals without hunting for extra parts. The components are designed for durability and consistent alignment to produce strong internal threads that resist wear.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I use this kit to repair a stripped 5\/16-18 thread?\u003c\/h3\u003e\n\u003cp\u003eRepairing a damaged hole is a three-step process: drill to the specified size, tap the new thread form, and install the helicoil insert before breaking off the tang. The kit contains parts sized specifically for 5\/16-18 work so each step aligns correctly and the finished thread matches the original fastener dimensions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse the 135° twist drill to clear the old thread and reach the correct diameter (≈8.3 mm).\u003c\/li\u003e\n  \u003cli\u003eRun the HSS tap to cut the new coarse thread profile cleanly and squarely.\u003c\/li\u003e\n  \u003cli\u003eDrive a stainless-steel insert with the installation tool and snap off the breaking pin with the provided breaker.\u003c\/li\u003e\n  \u003cli\u003eVerify fit with the hexagon wrench and test with the original bolt.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and parts are included, and will they hold up under repeated use?\u003c\/h3\u003e\n\u003cp\u003eThe kit combines high-speed steel and precision stainless-steel wire components for long service life. The drill and tap are made to handle soft and medium metals, while the inserts are corrosion-resistant and strengthen the repaired thread against repeated assembly cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1 twist drill (135°) for clean hole preparation.\u003c\/li\u003e\n  \u003cli\u003e1 HSS screw tap sized for 5\/16-18 threading.\u003c\/li\u003e\n  \u003cli\u003e1 insertion tool and 1 break-off pin tool for accurate install and tang removal.\u003c\/li\u003e\n  \u003cli\u003e25 stainless-steel helicoil inserts plus a hex wrench and fitted storage box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow versatile is this kit for automotive and workshop jobs?\u003c\/h3\u003e\n\u003cp\u003eThis SAE-focused set is intended for common automotive tasks like cylinder head bolts, engine brackets and accessory mounts, but it also works for industrial hardware and DIY metal repairs. The drill, tap and inserts are suitable for aluminum, iron, carbon steels, bronze and magnesium, covering most shop scenarios where thread reinforcement is needed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngine repair: restore stripped bolt holes in heads and blocks.\u003c\/li\u003e\n  \u003cli\u003eMachinery maintenance: renew threads on housings and flanges.\u003c\/li\u003e\n  \u003cli\u003eFabrication and restoration: strengthen threads in softer alloys.\u003c\/li\u003e\n  \u003cli\u003eHome workshop jobs: fix stripped bolts in tools, mounts and brackets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat features make this kit convenient to carry and work with?\u003c\/h3\u003e\n\u003cp\u003eOrganization and ease of identification speed up repairs. The metal storage case keeps every piece in place, while the drill and tap have engraved size markings for quick selection. The ergonomic handling surfaces and compact layout help when working in tighter engine bays or on-site repairs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable iron carry case with dedicated slots for each tool and insert.\u003c\/li\u003e\n  \u003cli\u003eEngraved markings on the drill and tap for fast identification.\u003c\/li\u003e\n  \u003cli\u003eErgonomic handle on hand tools for improved grip and control.\u003c\/li\u003e\n  \u003cli\u003e25 spare inserts so you can perform multiple repairs without restocking.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The KUNGJUER 30PC 5\/16-18 Helicoil kit fits mechanics, fabricators, maintenance techs and serious DIYers who need a reliable rethreading solution for SAE-sized fasteners. If you work on engines, metal assemblies or routinely repair threaded holes in soft to medium metals, this all-in-one set provides the correct tools and enough inserts to complete several repairs with professional results.\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: Can this kit repair stripped 5\/16-18 threads in aluminum engine parts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit’s drill, HSS tap and stainless inserts are suitable for aluminum and restore a stronger internal thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many repairs can I do with the 25 inserts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: You can complete up to 25 individual thread repairs, depending on hole condition and whether any inserts are wasted.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"KUNGJUER","offers":[{"title":"Default Title","offer_id":55161899843927,"sku":"B0FRRZHQZR","price":29.51,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/kungjuer-front-packaging-5-16-18-helicoil-kit.jpg?v=1790333468","url":"https:\/\/britishgarage.co.uk\/products\/kungjuer-5-16-18-helicoil-thread-repair-kit-30pc-stainless-inserts-hss-tap-drill","provider":"British Garage","version":"1.0","type":"link"}