Holo-krome 76536 Hex Socket Cap Screw M20 X 2.50 Metric

Product Description

The HOLO-KROME 76536 is a metric hex socket cap screw designed for high-strength mechanical fastening in industrial and trade applications. It features an M20 x 2.50 thread size with a 130 mm length under head, partial threading, and a hexagonal socket drive. The fastener is manufactured from alloy steel to material grade 12.9, the highest common grade for socket cap screws, indicating exceptional tensile and yield strength. A black oxide coating provides moderate corrosion resistance and a uniform matte finish. This screw is installed using a hex key or Allen driver and is commonly specified by millwrights, maintenance technicians, and mechanical contractors.

This screw is suited for heavy-duty mechanical assemblies, machine frames, tooling fixtures, and structural joints requiring a high-clamp-load fastener. The partial threading allows the unthreaded shank to function as a precise locating feature, reducing shear load on the threads. It conforms to ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 standards, making it appropriate for metric-specified engineering drawings in both OEM manufacturing and MRO replacement contexts.

Key Features

• M20 x 2.50 thread size with 130 mm length under head
• Material grade 12.9 alloy steel for maximum tensile strength
• Partially threaded shank for precise location and shear resistance
• Black oxide coating for corrosion resistance and low-reflectance finish
• Hex socket drive compatible with standard Allen keys and hex bit drivers
• Compliant with ANSI B1.13M, DIN 912, ISO 4762, and ISO 898-1 standards

Compatibility

Designed as a standard metric hex socket cap screw per DIN 912 and ISO 4762, suitable for any M20 x 2.50 tapped hole application requiring a grade 12.9 high-strength fastener.

Installation Notes

Installation is performed by millwrights or mechanical technicians using a properly sized hex key or driven hex bit. Always verify the mating tapped hole meets the M20 x 2.50 metric thread specification and confirm the hole depth accommodates the partially threaded shank before assembly. De-energize and lockout any equipment before fastener replacement on live machinery per applicable safety codes. Do not substitute a lower material grade fastener in applications specifying 12.9.