Value Collection HCI803103251NA-050BX Hex Cap Screw 5/16-18

Product Description

The VALUE COLLECTION HCI803103251NA-050BX is a hex head cap screw engineered for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 5/16-18 UNC thread pattern and measures 3-1/4 inches under the head with partial threading along the shank. Manufactured from Grade 8 steel, this fastener delivers tensile strength suited for demanding bolted joints where standard Grade 5 hardware would be insufficient. The zinc yellow dichromate finish provides corrosion resistance and is the recognized indicator of Grade 8 classification in coated hex fasteners. Machinists, millwrights, and maintenance technicians working with heavy equipment, agricultural machinery, or structural steel will find this fastener appropriate for their specifications.

This hex head cap screw is used in general industrial maintenance, OEM assembly, and structural repair where a partially threaded shank is required to bear shear loads or to pull mating components firmly together without thread engagement across the full grip length. The 5/16-18 UNC thread is a common size in inch-standard mechanical assemblies across manufacturing, agricultural, and heavy equipment sectors. Sold in minimum order quantities of 50 per box, this fastener is suited for shop stock, job site supply, or MRO replenishment.

Key Features

• Grade 8 steel construction for high tensile and proof load requirements
• 5/16-18 UNC thread for compatibility with standard inch-system nuts and tapped holes
• Partial threading allows the unthreaded shank to carry shear loads in bolted joints
• Zinc yellow dichromate finish provides corrosion resistance and visual grade identification
• 3-1/4 inch length under head accommodates deeper grip lengths in thick material stacks
• Minimum order quantity of 50 units supports shop stock and bulk service needs

Compatibility

Designed as an inch-standard UNC hex head cap screw for use with any 5/16-18 threaded nut, insert, or tapped hole conforming to ASME B18.2.1 dimensional standards for hex cap screws.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with torque specifications appropriate to Grade 8 fasteners at this diameter. Always verify the mating thread is clean and in good condition before assembly. Use a properly sized hex wrench or socket and torque to the value specified in the equipment service manual or applicable fastener standard. Do not use an impact driver set above the recommended torque range for this fastener size and grade.