{"product_id":"spi-91-407-7-feeler-gauge-0-55mm-parallel-leaf-12-inch","title":"Spi 91-407-7 Feeler Gauge 0.55mm Parallel Leaf 12 Inch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 91-407-7 is a single-leaf feeler gauge used to measure and verify precise gaps in mechanical assemblies, valve clearances, bearing fits, and similar close-tolerance applications. The leaf measures 0.55 mm in thickness, 0.5 inches wide, and 12 inches long, providing a stable, parallel profile across the full working length. Constructed from high carbon steel, the blade resists flex and wear under repeated use. This type of gauge is a standard precision hand tool used by HVAC technicians, machinists, engine mechanics, and field service professionals who need reliable gap measurement without calipers or dial indicators.\u003c\/p\u003e\u003cp\u003eThe 91-407-7 is suited for residential and commercial maintenance tasks where a specific gap specification must be confirmed or set. Typical applications include checking spark plug gaps, valve lash clearances, compressor blade clearances, burner orifice spacing, and any assembly that calls out a 0.55 mm tolerance. The parallel leaf style ensures consistent thickness from tip to blade, so measurement readings are uniform along the entire insert length. This is a single-leaf gauge sold individually.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eParallel leaf profile delivers consistent 0.55 mm thickness along the full 12-inch length\u003c\/li\u003e\n\u003cli\u003eHigh carbon steel construction provides durability and resistance to deformation under repeated use\u003c\/li\u003e\n\u003cli\u003e12-inch leaf length accommodates deep or hard-to-reach gap locations\u003c\/li\u003e\n\u003cli\u003e0.5-inch blade width offers a stable seating surface in standard gap applications\u003c\/li\u003e\n\u003cli\u003eSingle-leaf format allows targeted use without the bulk of a multi-blade set\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose precision feeler gauge leaf suitable for any application requiring gap verification at a 0.55 mm specification across HVAC, mechanical, and industrial service trades.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eFeeler gauges are hand tools and require no installation, but proper use matters for accurate readings. Insert the leaf into the gap with light, consistent hand pressure — the blade should slide with slight drag, not bind or drop freely. De-energize and lock out any equipment before inserting a gauge into a live mechanical assembly. Do not force a blade that is too thick for the gap, as this can distort the leaf and compromise accuracy on future measurements.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.55 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeaf Width\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeaf Length\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeaf Style\u003c\/strong\u003e: Parallel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 91-407-7\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51711321506098,"sku":"91-407-7","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b9f0cccb48d7ae87787afefd5cc22e66.jpg?v=1788475648","url":"https:\/\/voomisupply.com\/products\/spi-91-407-7-feeler-gauge-0-55mm-parallel-leaf-12-inch","provider":"Voomi Supply","version":"1.0","type":"link"}