Value Collection 644259PS Hex Head Cap Screw M20 2.50 150mm

Product Description

The VALUE COLLECTION 644259PS is a metric hex head cap screw designed for bolted assemblies requiring a partially threaded fastener. It carries a Grade 8.8 steel rating, indicating medium-high tensile strength suitable for structural and mechanical connections. The screw measures M20 x 2.50 thread pitch with a 150 mm length under head and a 30 mm hex drive. The bright, uncoated finish leaves the steel surface bare, which is standard for indoor or controlled-environment applications where additional corrosion protection is applied separately or is not required. This fastener is sold individually and is appropriate for use by machinists, millwrights, and maintenance technicians.

This screw is used in metric bolted joint applications across industrial machinery, structural steel fabrication, automotive equipment, and general mechanical assembly. The partially threaded shank allows the unthreaded section to bear shear loads in clearance-hole applications. It conforms to DIN 931 and ISO 4014 standards, making it suitable wherever those dimensional and mechanical property specifications are called out on engineering drawings or maintenance documentation.

Key Features

• Grade 8.8 steel construction provides a minimum tensile strength appropriate for medium-high load bolted joints
• Partially threaded shank per DIN 931 and ISO 4014 standards allows shear load transfer through the unthreaded grip zone
• M20 x 2.50 thread size with 150 mm length under head suits heavy mechanical and structural connections
• 30 mm hex drive is compatible with standard metric combination wrenches and hex sockets
• Bright uncoated finish meets DIN 931 and ISO 4014 dimensional requirements without added coating thickness
• Sold as a single unit with no minimum order multiplier requirement

Compatibility

Designed as a standard metric replacement or service fastener for any bolted assembly specifying an M20 x 2.50 x 150 mm partially threaded hex head cap screw conforming to DIN 931 or ISO 4014.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a metric wrench or socket sized to the 30 mm hex. Torque the fastener to the value specified in the equipment service documentation for Grade 8.8 M20 hardware. Ensure mating threads and seating surfaces are clean and free of debris before installation. Do not use impact tools at full power without a torque-limiting setting, as over-torquing a Grade 8.8 fastener can reduce clamp load and compromise joint integrity.