J.w. Winco 913.3-M5-20-KU Set Screw M5x0.8 20mm

Product Description

The J.W. WINCO 913.3-M5-20-KU is a metric hex-drive set screw designed for mechanical fastening applications where a non-marring, vibration-resistant point is required. It carries an M5x0.8 thread with a 20 mm thread length and is driven by a 2.54 mm (0.100 inch) hex key. The fastener is manufactured from Grade 5.8 steel with a black oxide finish and features a nylon soft tip that protects shaft or mating surface finishes during installation and provides frictional resistance against loosening under load. This screw is installed by licensed millwrights, maintenance technicians, and mechanical service professionals working on rotating or stationary mechanical assemblies.

This set screw is suited for use in shaft collars, shaft couplings, pulleys, gears, knobs, and similar mechanical components where the fastener must bear against a shaft without penetrating or scoring the surface. The soft nylon tip distributes clamping load across the contact point, making it appropriate for hardened or finished shaft surfaces. It is a common maintenance and OEM replacement fastener in light-to-medium industrial and commercial mechanical equipment.

Key Features

• M5x0.8 metric thread, 20 mm thread length - fully threaded set screw body
• Grade 5.8 steel construction provides reliable strength for general mechanical fastening
• Nylon soft tip protects shaft surfaces and resists vibration-induced loosening
• Black oxide finish reduces surface corrosion and glare in service environments
• Hex drive requires 2.54 mm (0.100 inch) hex key for installation and removal
• Metric thread standard - compatible with metric mechanical assemblies

Compatibility

Designed as an OEM-style replacement or maintenance fastener for metric mechanical assemblies requiring an M5x0.8 hex-drive soft-tip set screw.

Installation Notes

Installation should be performed by a qualified mechanical or maintenance technician. De-energize and lock out all equipment before accessing any shaft or mechanical assembly. Use the correct 2.54 mm hex key to avoid rounding the drive socket. Do not overtighten - apply torque gradually to seat the nylon tip flush against the shaft surface without deforming the tip material.