Products

Spring Nut (Channel Nut) — Self-Locking Fastener for Strut Channel Systems

A spring nut (also known as a channel nut or strut nut) is a specialized fastener designed to work with metal framing channels such as Unistrut-type systems. It consists of a rectangular nut body with serrated grooves on the edges and a coil spring attached to one side. When inserted into a channel and rotated 90°, the grooves engage the inturned flanges of the channel, while the spring holds the nut securely in position—enabling true hands‑free installation.

Channel nuts, including spring nuts, typically have a threaded hole in the center which is used to attach fittings, bolts, or threaded rods to the strut system. Unistrut nuts are available with a variety of hole sizes to accept a range of hex bolt sizes.

Key Advantages

• Hands‑Free Installation – The built‑in spring holds the nut in place inside the channel, eliminating the need to hold the nut while inserting a bolt or threaded rod. This saves 30 seconds to a minute per connection point, significantly reducing labor costs on large installations.

• Self‑Locking & Vibration Resistance – The spring mechanism adds tension that secures the connection after installation, providing greater resistance to loosening from vibration and dynamic loads than standard channel nuts.

• Easy Positioning – The spring‑loaded design allows the nut to be easily slid along the channel and repositioned without tools, making it ideal for adjustable mounting applications.

• Secure Grip – Serrated grooves on the nut edges act as small teeth that lock onto the channel flanges when tightened, preventing rotation and ensuring a secure connection.

• Time & Cost Savings – By eliminating the need for pre‑drilling and reducing installation time, spring nuts lower overall project labor costs.

Materials & Standards

• Carbon Steel (Mild Steel) – Manufactured from cold rolled coil, stamped, machined, and case hardened for positive biting action into channel edges. Standard carbon steel nuts conform to ASTM A576 GR 1015 modified and ASTM A1011 SS GR 45.

• Stainless Steel (SS304 / SS316) – Type 316 stainless steel is case hardened and polished with a standard “brite” finish, providing excellent corrosion resistance for sanitary, marine, and outdoor applications. Ideal for salt water and chlorine environments.

• Standards Compliance:

  • DIN 1624 – German standard for channel nuts and T‑nuts

  • SAE J891 – Complete general and dimensional specifications for metric and inch spring nuts

  • ANSI B1.1 (UNC Class 2) – Unified screw thread standard for inch nuts

  • ASTM A576 – Carbon steel bars for nuts

  • ASTM B633 Type III SC1 – Electro‑galvanized finish standard

  • ASTM A153 – Hot‑dip galvanized finish standard

Surface Finishes

• Plain (Uncoated) – No surface treatment

• Electro‑Galvanized (EG / Zinc Plated) – Conforms to ASTM B633 Type III SC1. Standard finish for indoor applications

• Hot‑Dipped Galvanized (HDG) – Conforms to ASTM A153. Heavy‑duty corrosion protection for outdoor and harsh environments

• Stainless Steel Finish (Polished “Brite”) – For SS304/SS316 nuts, provides enhanced corrosion resistance and aesthetic appearance

️ Applications

Spring nuts are essential fasteners for strut channel systems across multiple industries:

• Solar Mounting Systems – Securing solar panels to Unistrut rails using spring nuts and bolts. The adjustable nature of spring nuts allows for millimeter‑level alignment corrections during installation.

• Electrical & Cable Management – Mounting cable trays, conduits, and electrical enclosures to strut channels in commercial and industrial buildings.

• HVAC Installations – Suspending ductwork, piping, and HVAC equipment from overhead strut supports.

• Construction & Metal Framing – Building structural frameworks, workstations, shelving systems, and modular support structures.

• Industrial Machinery – Mounting machinery, conveyors, and production line equipment to strut systems.

• Mechanical Engineering – Guide rail systems, pipe supports, and hose clamp assemblies.

• Cable Tray Systems – Supporting and managing cables in data centers, factories, and infrastructure projects.

• Commercial & Industrial Racking – Adjustable storage and shelving systems requiring flexible fastening points.

️ Installation Guide

1. Insert the spring nut diagonally into the strut channel slot

2. Rotate the nut 90° so the serrated grooves align under the channel lips

3. Release the spring – it will expand and hold the nut in position

4. Insert the bolt or threaded rod through the fitting into the nut

5. Tighten to the recommended torque

Pro Tip: For easier sliding in perforated channels, consider spring nuts with plastic collars (e.g., Top Grip Nut) instead of coiled wire springs.

Packaging & Supply

• Packaging: Bulk cartons, small boxes, or custom packaging per requirement

• Supply Capacity: 2000+ tons per year

• Lead Time: 15–30 days (stock sizes available)

• Payment Terms: T/T, L/C, Western Union

✅ Why Choose Shanghai Malaxy?

As a leading fastener manufacturer based in Shanghai, Shanghai Malaxy delivers high‑quality spring nuts and channel nuts with ISO 9001:2015 certification, competitive factory pricing, and reliable export logistics to global markets. All products undergo strict quality control including case hardening verification, torque testing, and salt spray testing (for plated finishes) to ensure performance meets international standards.

Our channel nuts are compatible with major strut channel systems including Unistrut P1000, P1100, P2000, and P3000 series, as well as standard metric channels.

Contact us today for a competitive quote on spring nuts / channel nuts – standard sizes in stock, custom OEM orders welcome!