Holo-krome 76537 Hex Socket Cap Screw M20 X 2.50 140mm

Product Description

The HOLO-KROME 76537 is a metric hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. Manufactured from grade 12.9 alloy steel with a black oxide coating, this fastener delivers exceptional tensile strength and moderate corrosion resistance. The M20 x 2.50 thread profile with a 140 mm length under head and partial threading makes it well suited for through-bolt and tapped-hole configurations where precise clamping load is required. Licensed tradespeople and mechanical assemblers working on heavy equipment, structural fixtures, and machine frames rely on this grade for critical joint integrity.

This screw is used in commercial and industrial settings where high-grade metric fasteners are specified by engineering drawings or OEM service documentation. Partial threading allows the unthreaded shank to bear shear loads while the threaded section engages the tapped bore. Typical applications include machinery frames, hydraulic component mounting, structural steel fabrication, and precision equipment assembly. It conforms to ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 standards, making it interchangeable with internationally specified fasteners of the same class.

Key Features

• Grade 12.9 alloy steel construction for maximum tensile and proof load ratings
• Black oxide finish provides mild corrosion resistance and reduces light reflection in service environments
• Partially threaded shank supports combined shear and tensile loading
• Hex socket drive (internal hex) for high-torque installation with Allen or hex bit tools
• Meets ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 fastener standards
• M20 x 2.50 thread size suitable for heavy-duty mechanical and structural assemblies

Compatibility

Designed as a standard metric replacement or service fastener compatible with any tapped bore or nut conforming to M20 x 2.50 thread geometry per ISO and DIN metric specifications.

Installation Notes

Installation requires an appropriately sized hex key or socket bit; always use calibrated torque tooling when tightening grade 12.9 fasteners to engineered joint specifications. De-energize and lock out all machinery before fastener removal or replacement in live assemblies. Do not substitute a lower-grade fastener in a joint designed for grade 12.9 - doing so can result in joint failure under load. Apply thread lubricant only when specified by the engineering document, as lubricant changes the torque-to-clamp-force relationship.