Value Collection 644558PR M4 Hex Cap Screw Grade 8.8

Product Description

The VALUE COLLECTION 644558PR is a metric hex head cap screw designed for general mechanical assemblies requiring a reliable, partially threaded fastener. Manufactured from Grade 8.8 steel with a bright, uncoated finish, this screw meets DIN 931 and ISO 4014 standards for dimensional accuracy and mechanical performance. The M4 x 0.70 thread pitch and 50 mm length under head make it suited for medium-duty clamping applications. The 7 mm hex drive allows installation with standard metric hex tooling. Licensed trades and assembly technicians working with metric hardware will find this screw a direct-fit for a broad range of structural and mechanical connections.

This fastener is used in residential and light commercial mechanical assemblies, equipment enclosures, HVAC components, and general fabrication work where metric fasteners conforming to DIN 931 or ISO 4014 are specified. Partial threading along the shank provides a smooth bearing surface, which is advantageous in applications requiring precise bolt alignment or shear load transfer. This screw is sold individually with a minimum order quantity of 100 units, making it appropriate for stocking in maintenance shops or production environments with ongoing metric fastener demand.

Key Features

• Grade 8.8 steel construction provides reliable tensile strength for medium-duty mechanical assemblies
• Partially threaded shank per DIN 931 and ISO 4014 for accurate alignment and shear load handling
• M4 x 0.70 mm thread pitch with 50 mm length under head for versatile metric fitment
• 7 mm hex drive compatible with standard metric wrenches and sockets
• Bright, uncoated finish suitable for dry or controlled-environment installations
• Conforms to DIN 931 and ISO 4014 dimensional standards

Compatibility

Designed as a standard metric replacement fastener for assemblies specifying an M4 x 0.70 x 50 mm partially threaded hex head cap screw per DIN 931 or ISO 4014.

Installation Notes

Installation should be performed by a qualified mechanic or technician familiar with metric fastener torque requirements for Grade 8.8 hardware. Always power down or de-energize equipment before replacing or installing fasteners in electrical or mechanical enclosures. Use a calibrated torque wrench sized for a 7 mm hex drive to achieve proper clamp load without overloading the M4 thread. Do not apply coatings, lubricants, or thread-locking compounds unless specifically required by the equipment manufacturer, as these affect torque-tension relationships.