{"product_id":"castrol-braycote-gear-lubricant-646-mil-l-46000","title":"Castrol Braycote Gear Lubricant 646 (MIL-L-46000) - Quart","description":"\u003c!-- 1. TITLE OPTIMIZATION (H1) --\u003e\n\u003cdiv class=\"aerospace-product-description\"\u003e\n\u003cp\u003e\u003cstrong\u003eCastrol Braycote® 646\u003c\/strong\u003e (formerly Brayco 646) is a specialized, semi-fluid gear lubricant engineered by Castrol for severe-duty military, aerospace, and defense applications. Formulated to strictly comply with \u003cstrong\u003eMIL-L-46000\u003c\/strong\u003e specifications, Braycote 646 utilizes a high-grade synthetic base fluid combined with specialized thickeners and extreme pressure (EP) additives. Designed specifically for automatic weapons, small arms, enclosed gear drives, and mechanism assemblies operating across extreme temperature ranges, it delivers superior wear protection, low starting torque at sub-zero temperatures, and outstanding corrosion inhibition under harsh, high-humidity, and marine salt-spray environments.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications \u0026amp; Cross-References\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castrol Industrial \/ Specialty Lubricants\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Line:\u003c\/strong\u003e Braycote® Series (Braycote 646 \/ Formerly Brayco 646)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical Base:\u003c\/strong\u003e Synthetic Hydrocarbon Fluid with Special Thickener System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical State:\u003c\/strong\u003e Semi-Fluid \/ Soft Liquid Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNLGI Grade:\u003c\/strong\u003e NLGI 00 \/ 000 (Flowable semi-fluid consistency)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Dark Amber \/ Brown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range:\u003c\/strong\u003e -65°F to 260°F (-54°C to 127°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlash Point:\u003c\/strong\u003e \u0026gt; 300°F (\u0026gt; 149°C)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApproved Specifications \u0026amp; Aviation Conformance:\u003c\/h3\u003e\n\u003cp\u003eCastrol Braycote 646 is qualified against rigorous defense, military, and ordnance performance standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eU.S. Military Specification:\u003c\/strong\u003e Fully qualified to MIL-L-46000 (Lubricant, Semi-Fluid, Automatic Weapons and Small Arms).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNATO Stock Number \/ Standardization:\u003c\/strong\u003e Complies with NATO code requirements for military automatic weapons and gear mechanism lubrication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate \u0026amp; Seal Compatibility:\u003c\/strong\u003e Compatible with common aerospace metals, alloy steels, non-ferrous bushings, and standard synthetic elastomers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features \u0026amp; Performance Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSemi-Fluid Flowability:\u003c\/strong\u003e Combines the wetting and heat-dissipation benefits of an oil with the stay-in-place sealing action of a grease.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme Pressure \u0026amp; Anti-Wear Defense:\u003c\/strong\u003e Fortified with EP additives to prevent tooth scuffing, pitting, and high-impact loading wear under rapid cyclic operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCryogenic Low-Temperature Performance:\u003c\/strong\u003e Maintains fluidity and low starting torque down to -65°F (-54°C), preventing mechanism freezing or sluggish actuation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Corrosion \u0026amp; Oxidation Protection:\u003c\/strong\u003e Inhibits rust, salt-spray pitting, and metal degradation during long-term storage and field operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Shear Stability:\u003c\/strong\u003e Resists oil separation and mechanical breakdown under heavy mechanical churning and continuous friction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMilitary Weapons \u0026amp; Small Arms:\u003c\/strong\u003e Primary semi-fluid lubricant for automatic weapons, rotary cannons, feed mechanisms, and firing pins.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosed Aerospace Gearboxes:\u003c\/strong\u003e Used in light-duty aircraft actuators, accessory gear drives, speed reducers, and control system linkages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Mechanical Assemblies:\u003c\/strong\u003e Ideal for instrument gear trains, remote valves, and optical positioning drives requiring low friction and wide thermal range protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Castrol Brayco","offers":[{"title":"Default Title","offer_id":55241948332404,"sku":"BRAYC0TE646QT","price":138.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0888\/2991\/9604\/files\/braycote-646-mil-l-46000.png?v=1787928927","url":"https:\/\/145.aero\/products\/castrol-braycote-gear-lubricant-646-mil-l-46000","provider":"Aircraft Shop Supply","version":"1.0","type":"link"}