{"product_id":"olsa-tools-bolt-size-finder-keychain","title":"Olsa Tools Bolt Size Finder Keychain","description":"\u003cstrong\u003eOlsa Tools Bolt Size Finder Keychain is a compact, dual-sided metal gauge that quickly identifies bolt, nut, and fitting sizes in Metric (8–25mm) and SAE (5\/16\"–1\").\u003c\/strong\u003e\n\n\u003cp\u003eThis slim, pocket-ready tool eliminates guesswork when matching sockets, nuts, or fittings. Built with a dual-sided layout for Metric and SAE, the Olsa Tools Bolt Size Finder fits on a keyring and functions like a small, rugged caliper—so you can confirm sizes without trial-and-error or digging through a toolbox. It’s designed for everyday carry by mechanics, DIYers, and anyone who frequently works with fasteners or parts.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this keychain gauge speed up my work?\u003c\/h3\u003e\n\u003cp\u003eInstead of repeatedly testing sockets or measuring with bulky tools, this gauge gives an immediate size match. That reduces time spent switching bits or returning to the shop for the right tool. It’s especially useful on jobs where multiple fastener standards are encountered.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstant size identification for Metric and SAE fasteners.\u003c\/li\u003e\n\u003cli\u003eReduces socket trial-fitting and tool swapping.\u003c\/li\u003e\n\u003cli\u003ePortable on a keyring—ready wherever you go.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat range and accuracy can I expect from the gauge?\u003c\/h3\u003e\n\u003cp\u003eThe plated metal keychain covers Metric sizes from 8mm up to 25mm and SAE sizes from 5\/16\" to 1\". Each stamped opening is sized to seat a bolt head or nut cleanly so you can visually confirm the match. It’s not a laboratory instrument, but it offers practical accuracy for workshop and field use.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMetric coverage: 8mm–25mm for common automotive and household fasteners.\u003c\/li\u003e\n\u003cli\u003eSAE coverage: 5\/16\"–1\" for imperial applications.\u003c\/li\u003e\n\u003cli\u003eDurable metal construction for repeatable sizing checks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this tool do more than measure bolts?\u003c\/h3\u003e\n\u003cp\u003eYes—the design works like a quick visual caliper for other small parts. Use it to estimate hose fittings, spare threaded parts, or small hardware when you need a fast reference. The compact profile means you can carry it with keys or in a pocket without adding bulk.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUseful for hose swivel, nut, and small fitting checks.\u003c\/li\u003e\n\u003cli\u003eActs as a quick reference when ordering replacement parts.\u003c\/li\u003e\n\u003cli\u003eAttaches to a keyring so it’s available at the job site.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? If you’re a professional mechanic, a weekend wrench, a bicycle or appliance tinkerer, or someone who frequently matches fasteners, the Olsa Tools Bolt Size Finder Keychain is a practical addition to your EDC. It’s also an affordable gift for tool lovers—small enough to carry always, robust enough for regular shop use, and clear enough to cut down on frustrating size swaps.\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: What sizes does the Olsa Tools Bolt Size Finder measure?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It measures Metric from 8mm to 25mm and SAE from 5\/16\" to 1\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can it replace a caliper for precise measurements?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No—useful for quick checks and matching sockets, but not a substitute for precision calipers.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Olsa Tools","offers":[{"title":"Default Title","offer_id":48086953296030,"sku":"B0CLSFHTBW","price":31.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/olsa-tools-front-view-keychain-bolt-gauge.jpg?v=1785910593","url":"https:\/\/northtrailauto.ca\/products\/olsa-tools-bolt-size-finder-keychain","provider":"North Trail Auto","version":"1.0","type":"link"}