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The METRIC BLUE UST179808 is a metric hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, industrial equipment, and fabrication work. Manufactured from alloy steel to a Grade 12.9 specification, this screw delivers superior tensile strength for demanding bolted joints. The M16 x 2.00 thread size and 140 mm length under head make it well-suited for thicker stock and heavy-duty connections. The Metric Blue coating provides corrosion resistance while offering a visual indicator that distinguishes metric fasteners from inch-series hardware on the job. Drive is hex socket, requiring an appropriate hex key or socket driver for installation.
This fastener is used in industrial maintenance, machine building, equipment repair, and structural assemblies where metric fastening is required. The partial threading allows the unthreaded shank to align mating components before engagement, which is a common requirement in precision bolted connections. Machinists, millwrights, maintenance technicians, and fabricators routinely work with Grade 12.9 socket cap screws in these settings.
Designed as a standard M16 x 2.00 partially threaded hex socket cap screw for use in any application requiring a Grade 12.9 metric fastener of this thread pitch and length.
Installation should be performed by qualified mechanical or maintenance personnel familiar with metric fastener torque requirements for Grade 12.9 hardware. De-energize and lock out any equipment before replacing or installing fasteners in machinery. Use a properly sized hex key or hex socket driver to avoid rounding the drive recess. Do not substitute inch-series drivers in metric hex sockets, as this can damage the drive and compromise the joint.
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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