Value Collection 39409 Hex Cap Screw 1/2-20 X 2-1/4 in Grade 8 25pk

Product Description

The VALUE COLLECTION 39409 is a Grade 8 steel hex head cap screw sized 1/2-20 x 2-1/4 inches, designed for high-strength fastening in structural, mechanical, and industrial applications. The 1/2-20 thread designation indicates a half-inch diameter with 20 threads per inch, following the Unified Fine (UNF) thread standard. The screw is partially threaded, conforming to ASME B18.2.1 dimensional standards. A zinc yellow dichromate finish provides corrosion resistance and a visual indicator of the Grade 8 heat treatment. This fastener is sold in a pack of 25.

Grade 8 hex head cap screws are commonly used in automotive, heavy equipment, agricultural machinery, and structural assemblies where high tensile strength and reliable clamping force are required. The fine thread pitch of the 1/2-20 designation offers superior torque control and resistance to loosening under vibration, making this screw well-suited for precision mechanical joints. Tradespeople, maintenance technicians, and mechanical contractors working with steel and iron assemblies will find this fastener appropriate for demanding service environments.

Key Features

• Grade 8 steel construction for high tensile strength and hardness
• 1/2-20 UNF fine thread for precise torque control and vibration resistance
• 2-1/4 inches length under head, partially threaded per ASME B18.2.1
• Zinc yellow dichromate finish for corrosion protection and Grade 8 identification
• Sold in a convenient 25-piece pack with a minimum order quantity of 1

Compatibility

Designed as an ASME B18.2.1-compliant hex head cap screw for use in any application requiring a 1/2-20 UNF Grade 8 fastener with a 2-1/4-inch length under head and partial threading.

Installation Notes

Installation should be performed by a qualified technician familiar with fastener torque specifications appropriate to Grade 8 hardware and the specific joint material. Always consult the equipment manufacturer's torque table for the correct installation torque for 1/2-20 Grade 8 fasteners before tightening. Inspect mating threads for damage or contamination before assembly. Do not substitute a lower-grade fastener in any application specified for Grade 8 hardware.