{"product_id":"70-piece-thread-checker-set-standard-metric-nut-and-bolt-size-finder","title":"Thread Checker Set 70-Piece Metric \u0026 Inch Aluminum with Case","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eThread Checker Set — Match Nuts and Bolts with Color-Coded Gauges\u003c\/h2\u003e\n\u003cp\u003eA drawer of mixed nuts and bolts can turn a simple repair into a guessing game. This thread checker set helps DIYers, mechanics, and workshop users identify fastener threads by checking the fit against labeled gauges rather than judging size by appearance.\u003c\/p\u003e\n\u003cp\u003eThe set contains 70 aluminum alloy thread checkers: 33 red metric gauges and 37 blue inch gauges. Each checker has an external thread for checking nuts and an internal thread for checking bolts. Metric coverage runs from M2 to M24, corresponding to nominal diameters of 2–24 mm (approximately 0.079–0.945 in), with the specific diameter and pitch combinations listed below. These are thread sizes, not the physical dimensions of the gauges.\u003c\/p\u003e\n\u003cp\u003eUse this metric and inch nut and bolt size finder to sort loose hardware, identify replacement fasteners for furniture repairs, or check threads during automotive maintenance. A handled case with a labeled foam insert keeps the gauges organized between tasks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e✅\u003c\/span\u003e For nuts and bolts matching the listed metric and inch thread sizes. Not for NPT pipe threads. Match both diameter and pitch; this is a thread-identification set, not a tap-and-die set.\u003c\/div\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\u003cspan\u003e🔩 Dual-ended thread checker set: external threads check nuts, while internal threads check bolts.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e🔴 33 red metric checkers cover the listed thread combinations from M2-0.4 through M24-3.0.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e🔵 37 blue inch checkers distinguish standard fasteners from metric hardware at a glance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e🛠️ Aluminum alloy gauges feature a solid-top external-thread design shown in the product images.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e🔎 Double-sided etched gauge markings, printed foam labels, and a lid reference chart provide three ways to locate a size.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e🧰 A carry case with a handle, closing latches, and fitted foam positions keeps the set together for storage and transport.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e33 metric thread checkers, red\u003c\/li\u003e\n\u003cli\u003e37 inch thread checkers, blue\u003c\/li\u003e\n\u003cli\u003eCarry case with labeled foam insert and printed lid reference chart\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho Is This For\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-usecases\"\u003e\n\u003cdiv class=\"hdiy-usecase-item\"\u003e\n\u003cstrong\u003e🔧 Home DIYers\u003c\/strong\u003e\n\u003cp\u003eIdentify existing nut and bolt threads before choosing replacements for furniture or workshop repairs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-usecase-item\"\u003e\n\u003cstrong\u003e🚗 Automotive Repair Users\u003c\/strong\u003e\n\u003cp\u003eCheck removable fasteners against the listed thread sizes during maintenance and parts matching.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-usecase-item\"\u003e\n\u003cstrong\u003e🗂️ Workshop Organizers\u003c\/strong\u003e\n\u003cp\u003eSeparate mixed metric and inch hardware, then label storage bins with the identified thread sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eNut and Bolt Thread Checker Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChecker Quantity\u003c\/th\u003e\n\u003ctd\u003e70: 33 metric and 37 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGauge Material\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Coding\u003c\/th\u003e\n\u003ctd\u003eRed: metric; blue: inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChecking Interfaces\u003c\/th\u003e\n\u003ctd\u003eExternal thread for nuts; internal thread for bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMetric Sizes (diameter–pitch, mm)\u003c\/th\u003e\n\u003ctd\u003eM2-0.4, M2.5-0.45, M3-0.5, M3.5-0.6, M4-0.7, M5-0.8, M6-1.0, M7-1.0, M8-1.0, M8-1.25, M9-1.25, M10-1.0, M10-1.25, M10-1.5, M11-1.0, M11-1.25, M11-1.5, M12-1.0, M12-1.25, M12-1.5, M12-1.75, M14-1.5, M14-2.0, M16-1.5, M16-2.0, M18-1.5, M18-2.5, M20-1.5, M20-2.5, M22-1.5, M22-2.5, M24-2.0, M24-3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInch Sizes (diameter or numbered size–TPI)\u003c\/th\u003e\n\u003ctd\u003e1-12, 1-8, 7\/8-9, 7\/8-14, 3\/4-16, 3\/4-10, 5\/8-18, 5\/8-11, 9\/16-20, 9\/16-18, 9\/16-12, 1\/2-20, 1\/2-13, 7\/16-24, 7\/16-20, 7\/16-14, 3\/8-24, 3\/8-16, 5\/16-24, 5\/16-18, 1\/4-28, 1\/4-20, #12-28, #12-24, #10-32, #10-24, #8-36, #8-32, #6-40, #6-32, #5-40, #4-48, #4-40, #3-56, #3-48, #2-64, #2-56\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIdentification Labels\u003c\/th\u003e\n\u003ctd\u003eDouble-sided etched gauge markings, labeled foam insert, printed lid chart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003eHandled carry case with fitted foam insert and latches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExcluded Thread Type\u003c\/th\u003e\n\u003ctd\u003eNPT pipe threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I check a nut or bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThread a nut onto the checker's external thread, or thread a bolt into its internal thread. Start gently by hand. If the fit binds, stop and try the appropriate alternative rather than forcing the fastener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow are the metric and inch gauges separated?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMetric gauges are red and inch gauges are blue. Each gauge has size markings, with corresponding positions labeled in the foam insert and a reference chart inside the lid.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the 70 pieces split between nuts and bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe images identify 33 metric and 37 inch checkers. Each checker provides both an external nut-checking thread and an internal bolt-checking thread; these are not separate packs of nuts and bolts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the set cover every size between M2 and M24?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. It covers the 33 specific metric diameter and pitch combinations listed in the specifications, not every possible combination between the endpoints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I check NPT pipe fittings with this set?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. The product images expressly state that the set does not use NPT threads. Choose a suitable pipe-thread identification tool for NPT fittings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat do the size markings mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMetric labels indicate nominal diameter and pitch in millimeters. Inch labels indicate fractional diameter or a numbered screw size, followed by threads per inch. Always match the complete marking, not just the diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the storage case included?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe pictured set includes a handled carry case with fitted, labeled foam positions and a printed size chart inside the lid.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these gauges repair damaged threads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. They identify thread fit and are not cutting or thread-repair tools. Damaged threads can interfere with identification; do not force them onto a checker.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this set suitable for children?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis is a workshop tool containing small parts. The case carries a choking-hazard warning for children under five; keep it out of children's reach.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e\n\u003cp\u003eOrganize mixed fasteners and identify matching threads before your next repair. Check the listed sizes, then equip your workshop with this 70-piece metric and inch thread checker set.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Default Title","offer_id":67614473978130,"sku":"HTAEA1-1","price":60.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/01_4b290064-5ec2-48f8-9ff1-131ca7a49886.png?v=1791872456","url":"https:\/\/homediyer.com\/products\/70-piece-thread-checker-set-standard-metric-nut-and-bolt-size-finder","provider":"HomeDIYer","version":"1.0","type":"link"}