Holo-krome 76588 Hex Socket Cap Screw M30 X 3.50 Metric

Product Description

The HOLO-KROME 76588 is an M30 x 3.50 metric hex socket cap screw manufactured from alloy steel and finished with a black oxide coating. It carries a 130 mm length under head and is rated to material grade 12.9, indicating a high-strength fastener suitable for demanding structural and mechanical assemblies. The hex socket drive accepts a standard hex key for installation in confined spaces where a wrench cannot be applied. This screw meets ANSI B1.13M, ISO 4762, and ISO 898-1 standards, making it appropriate for engineered assemblies that require documented fastener compliance.

This fastener is used in heavy industrial, commercial, and OEM mechanical applications where large-diameter, high-strength metric cap screws are required. Typical installations include machine frames, hydraulic equipment, industrial presses, structural steel assemblies, and heavy-duty equipment manufactured to metric specifications. The black oxide finish provides mild corrosion resistance and reduces light reflection in tool and fixture applications. Maintenance technicians, millwrights, and industrial mechanics working on metric-spec equipment will encounter this size in field replacement and assembly work.

Key Features

• M30 x 3.50 metric thread with 130 mm length under head
• Grade 12.9 alloy steel construction for high tensile and proof load ratings
• Black oxide finish for mild corrosion resistance and low-glare surface
• Hex socket drive for installation in restricted-access locations
• Meets ANSI B1.13M, ISO 4762, and ISO 898-1 fastener standards

Compatibility

Designed as a direct-replacement metric hex socket cap screw for industrial machinery, OEM equipment, and structural assemblies requiring M30 x 3.50 grade 12.9 fasteners to ISO 4762 specifications.

Installation Notes

Installation is performed by millwrights, maintenance mechanics, or other qualified tradespeople using a calibrated torque wrench and the appropriate hex key or hex bit socket. De-energize all equipment and relieve any stored hydraulic or pneumatic pressure before replacing fasteners in live systems. Thread engagement, mating material hardness, and lubrication condition affect final torque values - consult the equipment manufacturer's torque specification table for this thread size and grade. Avoid mixing grade 12.9 fasteners with lower-grade hardware in the same joint without engineering review.