Metric Blue UST187528 M8x1.25 Button Socket Cap Screw

Product Description

The METRIC BLUE UST187528 is an M8x1.25 button socket cap screw designed for metric fastening applications requiring high clamping strength in a low-profile head configuration. Fully threaded along its 20mm length under the head, it is manufactured from Grade 12.9 alloy steel and finished with a blue phosphate coating that provides corrosion resistance and a consistent surface appearance. The hex socket drive accepts a 5mm hex key for installation and removal. This fastener is specified to ISO 7380 standards and is suited for use by mechanical contractors, industrial maintenance technicians, and precision assembly professionals.

This screw is used in applications where a standard hex cap screw head profile is too tall for the assembly clearance. The button head design distributes clamping load across a wider bearing surface than a standard socket cap screw. Typical install scenarios include machinery panels, equipment enclosures, and structural assemblies where metric fasteners are specified. Full threading along the 20mm shank length allows engagement in a range of thread depths without a grip-length constraint.

Key Features

• Grade 12.9 alloy steel construction provides high tensile and proof load ratings
• Button head profile reduces overall installed height for tight clearance applications
• Blue phosphate finish delivers corrosion resistance and a uniform appearance
• Fully threaded 20mm length under head maximizes thread engagement range
• 5mm hex socket drive for standard hex key or bit installation
• Manufactured to ISO 7380 fastener standard for dimensional consistency

Compatibility

Designed as an OEM-style metric replacement fastener for assemblies specifying M8x1.25 button socket cap screws per ISO 7380.

Installation Notes

Installation requires a 5mm hex key or socket bit. Confirm mating thread condition and thread depth before installation. Apply thread lubricant or threadlocker per assembly specifications where required. Follow applicable mechanical assembly standards and torque specifications provided by the equipment or assembly designer.