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The HOLO-KROME 69398 is a metric low socket cap screw designed for applications where standard socket cap head height creates clearance problems. The fastener features an M6x1 thread with a 4 mm head height and 5 mm hex key drive, machined from alloy steel and finished in black oxide. Material grade 10.9 confirms high tensile strength suitable for demanding mechanical assemblies. The black oxide coating provides a baseline level of corrosion resistance and reduces light reflection in precision equipment. This fastener is installed by machinists, millwrights, and mechanical technicians working on machine tools, fixtures, enclosures, and mechanical sub-assemblies where low-profile fastening is required.
The 69398 suits metric fastening applications in manufacturing, automation, and general mechanical assembly. Its low socket cap head profile makes it the correct choice when recessed mounting or tight clearances prevent use of a standard-height socket cap screw. The coarse M6x1 thread pitch and 6G thread fit class ensure consistent engagement with standard metric tapped holes. Length is measured under the head at 12 mm, and the screw is fully threaded for its entire shank length.
Designed for use in standard M6x1 metric tapped holes requiring a low-profile socket cap fastener per ANSI B1.13M.
Installation should be performed by a qualified machinist or mechanical technician using a calibrated 5 mm hex key or socket driver. Verify that the mating tapped hole conforms to M6x1 6H thread tolerance before installation. Do not exceed recommended torque values for grade 10.9 alloy steel at this thread size as overtorquing can yield the fastener or damage the tapped hole. Clean and inspect threads prior to installation to ensure proper fit and engagement.
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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