Value Collection 581682BR Hex Socket Cap Screw 5/8-18 Unf

Product Description

The VALUE COLLECTION 581682BR is a partially threaded hex socket cap screw engineered for high-strength fastening applications in metal fabrication, mechanical assembly, and maintenance work. Manufactured from alloy steel with a black oxide finish, this fastener delivers solid tensile strength and moderate corrosion resistance in dry and lightly oiled environments. The 5/8-18 UNF thread specification indicates a fine-thread profile, which provides greater thread engagement per inch than coarse-thread equivalents — preferred where precise clamping force or vibration resistance is critical. The 4-inch length under head and 1/2-inch hex drive are suited for applications requiring a standard torque tool interface and deeper fastener reach.

This screw is used in industrial machinery, structural assemblies, and precision equipment where fine-thread alloy fasteners are specified. Partial threading is typical when the shank must bear shear loads or when thread engagement is limited to the target material only. The black oxide coating is commonly selected for interior mechanical environments where a low-reflectance, mild corrosion-resistant finish is acceptable. This fastener is installed by machinists, millwrights, mechanical contractors, and maintenance technicians.

Key Features

• 5/8-18 UNF fine-thread profile for high thread engagement and vibration resistance
• 4-inch length under head for deep fastener reach in thick or stacked material
• Partially threaded shank for shear load bearing and controlled thread engagement
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish provides a low-reflectance surface with mild corrosion resistance
• 1/2-inch hex drive compatible with standard hex key and socket tooling

Compatibility

Designed as an OEM-style replacement or specification-matched fastener for applications requiring a 5/8-18 UNF partially threaded hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation requires a 1/2-inch hex key or socket driver. Always confirm the mating thread is clean and undamaged before installation. De-energize and lock out any machinery before replacing or installing fasteners in live equipment per applicable OSHA lockout/tagout procedures. Do not substitute a coarse-thread fastener in a fine-thread tapped hole.