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The METRIC BLUE UST184221 is a metric hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and equipment assembly work. It features an M10 x 1.50 thread profile with a 50 mm length under head and is manufactured from Grade 10.9 alloy steel, which delivers tensile strength comparable to SAE Grade 8 inch fasteners. The screw is partially threaded and uses a 17 mm hex drive. It meets ASME B18.2.3.1M, DIN 931, DIN 933, and SAE J1199 standards, making it suitable for precision-toleranced assemblies where verified material and dimensional compliance is required. Installed by machinists, millwrights, and maintenance technicians.
This fastener is used wherever a metric high-strength cap screw is specified in bolted joint assemblies, machinery frames, brackets, flanges, and structural connections. The partially threaded shank provides a smooth bearing surface through the clamped material, which is standard practice for joints that require shear load transfer or precise bolt fit in reamed holes. It is commonly specified in automotive, heavy equipment, hydraulic system, and general industrial manufacturing applications.
Designed as a standard metric replacement or assembly fastener for any application specifying an M10 x 1.50 x 50 mm Grade 10.9 partially threaded hex head cap screw per DIN 931, DIN 933, or ASME B18.2.3.1M.
Installation is performed by qualified mechanics, millwrights, or maintenance technicians using a 17 mm hex socket or open-end wrench. Always verify thread engagement depth and hole condition before driving the fastener. Apply appropriate thread lubricant or threadlocker per the joint design specification. Torque to the value specified by the equipment manufacturer or joint engineer for M10 Grade 10.9 fasteners - do not estimate torque without a verified specification.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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