Holo-krome 76543 Hex Socket Cap Screw M20 X 2.50 Metric

Product Description

The HOLO-KROME 76543 is a metric hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, industrial equipment, and structural connections. It features an M20 x 2.50 thread profile with a 200 mm length under head and is partially threaded, which allows for a cleaner bearing interface in bolted joints. The screw is manufactured from grade 12.9 alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces surface glare. Mechanical contractors, millwrights, and industrial maintenance technicians are the typical installers for fasteners of this specification.

This cap screw is suited for use in heavy-duty mechanical and structural applications where a high-clamp-load fastener is required. The hex socket drive accepts a standard hex key or Allen driver, making it practical in confined installations where a wrench cannot swing freely. It conforms to ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 standards, making it interchangeable with metric fasteners specifying those standards. Each unit is sold individually and ships at a minimum order quantity of one.

Key Features

• Grade 12.9 alloy steel construction for high tensile and proof load ratings
• Black oxide finish provides mild corrosion resistance and a non-reflective surface
• Partial threading preserves a smooth shank section for shear-load and clearance-hole applications
• Hex socket drive compatible with standard hex keys and socket bits
• Conforms to ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 standards
• Sold individually with no minimum order requirement beyond one unit

Compatibility

Designed as a standard-conforming replacement or service fastener for any application specifying an M20 x 2.50 hex socket cap screw per DIN 912 or ISO 4762 at grade 12.9.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with metric fastener torque requirements for grade 12.9 hardware. Always verify mating thread condition and clean threads before installation to achieve proper clamp load. Do not apply grade 12.9 fasteners in applications specifying a lower material grade without engineering review, as the higher hardness can affect fatigue behavior in dynamic loads. Black oxide finish offers limited corrosion protection - apply a thread lubricant or anti-seize as appropriate for the service environment.