U-nut Rittal PS 4119.000, thread M4, pack of 20, silver

Rittal U-nut PS 4119.000 is a slide-in nut with M4 internal thread supplied in packs of 20. Designed for panel and enclosure mounting where a captive nut is required, this silver-finished U-nut clips onto sheet edges, profiles or mounting rails to provide a reliable threaded fixing point. The product is intended for electrical cabinets, rack assemblies and general mechanical fastening tasks where a compact, easy-to-install threaded connection is needed.

Advantages

The U-nut provides a captive thread that simplifies installation of screws and bolts without the need to access the rear of the mounting panel. Its slide-in design allows rapid placement along punched rails or thin sheet edges and holds securely once engaged. The silver finish is corrosion-resistant for typical indoor applications, and the consistent thread size ensures compatibility with standard M4 fasteners commonly used in electrical and mechanical assemblies.

Suitable for

• Fixing covers, panels and small components to sheet metal enclosures
• Mounting equipment in electrical cabinets and rack systems
• Attaching accessory brackets and support plates to thin steel sections
• Applications where access to the rear side of the mounting surface is restricted

When it may not be suitable

This U-nut is designed for light to medium-duty applications and for attachment to sheet edges or punched rails compatible with its slide-in form. It may not be suitable where higher load capacity, heavy structural fastening or vibration-resistant locking is required. For mounting punched rails and punched sections without mounting flanges on angle brackets, mounting brackets and support brackets, U-nuts with a larger thread size are recommended.

Key specifications

• Thread size: M4
• Quantity per pack: 20 pieces
• Finish: silver
• Form factor: slide-in (U-nut) for sheet edges and punched rails
• Intended application: panel and enclosure mounting

How to use

Position the U-nut so the legs straddle the edge of the panel or slide it into a compatible punched rail until it locks into place. Align the mating component and insert an M4 screw or bolt through the component into the captive thread. Tighten the fastener to the torque appropriate for M4 fittings and the materials being joined. Installation can be carried out with standard hand tools; ensure the sheet thickness and rail profile are compatible with the slide-in geometry for correct retention.

What to consider before purchase

• Confirm compatibility of M4 thread with the screws or bolts you plan to use
• Verify sheet thickness and rail profile are suitable for slide-in U-nuts
• Assess load and vibration conditions to ensure M4 U-nuts meet strength requirements
• For installations on angle brackets or support brackets without mounting flanges, consider using a larger thread size

Usage recommendations

Use appropriate stainless or zinc-plated fasteners to match the U-nut finish and the environmental conditions. Avoid overtightening M4 fasteners to prevent thread damage; if higher mechanical strength or vibration resistance is required, select a U-nut and fastener combination rated for those conditions.