Holo-krome 72018 Hex Socket Cap Screw 4-40 Unc 1/4 in

Product Description

The HOLO-KROME 72018 is a hex socket cap screw designed for precision fastening in tight spaces where a standard hex-head wrench cannot access. This screw features a 4-40 UNC thread and a 1/4-inch length under head, making it suitable for small-assembly work in mechanical, electrical, and industrial enclosure applications. The alloy steel construction is finished with a black oxide coating, which provides mild corrosion resistance and reduces light reflection on the fastener head. Installation requires a 3/32-inch hex socket drive. The fully threaded shank delivers consistent clamping force across the entire grip length.

This fastener is used in low-clearance assembly environments where socket-drive access is required. Common applications include instrument panels, electrical enclosures, small mechanical assemblies, and precision equipment housings. The 4-40 UNC thread is a standard fine-pitch size commonly specified in light-duty machine assembly, electronics mounting, and OEM equipment manufacturing. It is sized for installations where fastener mass and footprint must be minimized without sacrificing thread engagement integrity.

Key Features

• 4-40 UNC fully threaded shank for consistent thread engagement along the full length
• 1/4-inch length under head for compact, low-profile installations
• 3/32-inch hex socket drive for use in restricted-access locations
• Alloy steel construction meets ASME B18.3 and ASTM A574 standards
• Black oxide finish provides mild corrosion resistance and a low-glare appearance

Compatibility

Designed as a standard 4-40 UNC hex socket cap screw conforming to ASME B18.3 and ASTM A574, suitable for use in any application specifying this thread size and drive type.

Installation Notes

Installation requires a calibrated 3/32-inch hex key or socket driver. Ensure mating threads are clean and free of debris before driving. Do not exceed the rated torque range for 4-40 alloy steel fasteners as specified by the applicable engineering standard or equipment manufacturer. Use of thread-locking compound should follow the assembly specification for the host equipment.