Holo-krome 76484 Hex Socket Cap Screw M20 X 2.50 Metric

Product Description

The HOLO-KROME 76484 is a metric hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and trade installations. Manufactured from alloy steel with a black oxide coating, this fastener meets ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 standards, placing it in the demanding Grade 12.9 material class. The M20 x 2.50 thread size and 40 mm length under head make it suited for heavy-duty bolted joints where precise torque loads and tight dimensional tolerances are required. The hex socket drive accepts a standard hex key or Allen-type driver. Mechanical contractors, millwrights, and maintenance technicians typically install this fastener in equipment assemblies, structural brackets, and machinery frames.

This screw is fully threaded along the 40 mm shank length under the head, providing maximum thread engagement throughout the grip length. It is appropriate for both original equipment assembly and field repair work where a Grade 12.9 alloy steel fastener is specified. The black oxide finish provides a moderate level of corrosion resistance suitable for indoor and protected environments. Applications include machine tool mounting, hydraulic component assembly, structural steel connections, and heavy equipment maintenance where metric fastener standards are required.

Key Features

• Grade 12.9 alloy steel construction for high tensile and proof load strength
• Fully threaded shank for maximum thread engagement at 40 mm length under head
• Black oxide coating provides mild corrosion resistance and reduces light reflection
• Hex socket drive for high-torque installation with standard hex keys or socket drivers
• Meets ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 fastener standards
• M20 x 2.50 metric thread form for compatibility with standard metric tapped holes

Compatibility

Designed as a standard metric hex socket cap screw for any application specifying an M20 x 2.50 Grade 12.9 DIN 912 or ISO 4762 fastener in alloy steel with black oxide finish.

Installation Notes

Installation should be performed by a qualified millwright, mechanical contractor, or maintenance technician familiar with metric fastener torque specifications. De-energize and lock out all equipment before replacing or installing fasteners in machinery assemblies. Use a calibrated torque wrench and the correct hex key or socket drive to achieve the specified clamp load for Grade 12.9 M20 hardware. Verify thread condition of the mating tapped hole before installation to avoid cross-threading or reduced joint strength.