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Locknuts

At SCHNAP, our Locknuts range offers tradies and contractors reliable, top-quality fittings for every electrical setup. From durable nylon and machined brass to marine-grade 316 stainless steel, we stock sizes from 12mm to 63mm to suit any conduit application. Whether you're after Clipsal-compatible gear or Tradepro's corrosion-resistant solutions, each locknut is built for secure fastening and long-term performance—even in tough Aussie conditions.

Buy online and save with trade discounts across the range. Check live stock levels across Australia and enjoy fast, reliable delivery to your site or shed.

$1.40 $1.20
20mm electro-gal locknut with 3mm thickness and corrosion-resistant electro-galvanised finish—ideal for securing conduit and fittings in electrical and mechanical assemblies. Built for industrial, commercial, and residential use, it ensures reliable fastening for long-term applications.
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$1.80 $1.50
Electro-gal locknut with 25mm size and 3mm thickness—ideal for securing electrical conduit fittings. Built for industrial and commercial applications, it features a corrosion-resistant electro-galvanised finish for long-lasting durability.
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$2.40 $2.00
32mm electro-gal locknut made from corrosion-resistant electro-galvanised steel, featuring a secure 3mm thickness—ideal for industrial and construction applications. Perfect for securing threaded components in mechanical and plumbing assemblies.
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$4.40 $3.70
Electro-gal locknut with a 40mm diameter and 3mm thickness—ideal for securing threaded components in industrial and construction applications. Built for durability and corrosion resistance, it ensures reliable fastening in galvanised fittings.
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$5.80 $4.80
Electro-gal locknut with 50mm size and 3mm thickness—ideal for industrial piping and electrical installations. Built for secure fastening, with corrosion-resistant electro-galvanised finish for durability.
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$2.90 $2.40
16mm zinc plated locknut with a 5mm thread diameter—ideal for electrical conduit fittings and mechanical fastening in construction. Built for tradespeople, it offers corrosion resistance and durability for secure fastening.
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$3.20 $2.60
20mm zinc plated locknut with a 5mm thread diameter—ideal for securing threaded components in industrial and construction applications. Built for durability and reliability, it features a corrosion-resistant finish that extends product life.
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$4.20 $3.40
Zinc plated locknut with a 25mm size and 5mm thread pitch—ideal for securing threaded components in industrial and construction applications. Built for durability and reliability, it offers excellent corrosion resistance for long-lasting performance.
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$6.30 $5.20
32mm zinc plated locknut with a 5mm thread pitch—ideal for securing threaded components in galvanised fittings. Built for industrial and construction applications, it offers corrosion resistance for extended product life.
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$9.30 $7.70
40mm zinc plated locknut with a 5mm thread size—ideal for securing threaded components in industrial and construction applications. Built for durability and corrosion resistance, it ensures reliable fastening in electrical and mechanical assemblies.
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$13.10 $10.80
Zinc plated locknut with a 50mm size and 5mm thread pitch—ideal for industrial and construction applications. Built for reliable fastening, it offers durable performance and long-lasting corrosion protection.
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$19.20 $15.90
Zinc plated locknut with a 63mm diameter and 5mm thread size—ideal for securing threaded components in industrial and construction applications. Built for durability, it features corrosion resistance to extend product life and reduce waste.
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$4.80 $4.00
20mm hot dip galvanised locknut made from steel, offering high corrosion resistance—ideal for securing threaded fasteners in construction and industrial applications. Built for durability, it minimizes waste with its extended product life.
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$5.70 $4.70
This 25mm hot dip galvanised locknut offers superior corrosion resistance, making it ideal for securing threaded pipes and fittings in plumbing and construction. Built for both industrial and residential applications, it ensures a secure fit and compliance with safety standards.
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$9.10 $7.50
32mm hot dip galvanised locknut with superior corrosion resistance and a robust locking mechanism—ideal for construction and industrial applications. Built for outdoor use, it ensures secure fastening in corrosive environments.
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$13.10 $10.80
40mm hot dip galvanised locknut with superior corrosion resistance and durable design—ideal for securing threaded pipes in plumbing and construction. Built for both industrial and residential applications, it ensures long-term reliability and compliance with AS/NZS 1170 standards.
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$19.20 $15.90
Secure your threaded pipes with this 50mm hot dip galvanised locknut, designed for superior corrosion resistance and ideal for plumbing and construction applications. Built for both industrial and residential use, it ensures a reliable fit for standard pipe fittings.
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$121.30 $100.20
Gland nut adaptor 1/4 BSP designed for seamless connections—ideal for plumbing and electrical applications. Built for reliability, with durable brass construction ensuring long-lasting performance.
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$2.60 $2.20
Cabac M12 nickel plated brass locknut designed for GU12 metal glands, providing corrosion resistance and ensuring IP66 or IP68 protection when used with matching glands.
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$9.60 $8.00
The Cabac Locknut for GU16EMC/L is a nickel-plated brass locknut designed to secure EMC cable glands in metal enclosures, providing superior corrosion resistance, optimal electrical contact, and vibration resistance. Compatible with CABAC Brass EMC Metric Glands for IP68 protection.
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$9.60 $8.00
The Cabac Locknut for GU20EMC/L is a nickel-plated brass locknut designed to secure EMC cable glands in metal enclosures, providing superior corrosion resistance, optimal electrical contact, and vibration resistance for industrial applications.
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$14.10 $11.60
Cabac M50 Locknut for GU50 metal glands, made from corrosion-resistant nickel plated brass, providing secure fitting and IP66/IP68 protection when used with matching glands.
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$12.50 $10.40
The Cabac Locknut for GU25EMC/L is a nickel-plated brass locknut designed to secure EMC cable glands in metal enclosures, providing superior corrosion resistance, optimal electrical contact, and enhanced vibration resistance for industrial applications.
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$43.00 $35.60
The Cabac Locknut for GU50EMC/L is a nickel-plated, lead-free brass locknut designed to secure EMC cable glands in metal enclosures, ensuring optimal electrical contact, equipotential bonding, and enhanced vibration resistance with IP68 environmental protection.
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$24.80 $20.50
Cabac M63 metric locknut made from nickel plated brass designed to fit CABAC metal glands GU63, CW63, and A2-63, providing corrosion protection and enabling IP66 or IP68 rated assemblies.
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$48.20 $39.80
The Cabac Locknut for GU63EMC/L is a nickel-plated brass locknut designed to secure EMC cable glands in metal enclosures, providing superior corrosion resistance, optimal electrical contact, and vibration resistance for industrial applications.
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$2.30 $1.90
Cabac Fitting Locknut Nickel Plated Brass M16 provides secure and durable fastening for threaded fittings in conduit and cable management systems with high mechanical and UV protection.
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$30.90 $25.50
Nickel-plated brass locknut designed for securing conduit fittings to enclosures, panels, or equipment. Compatible with CABFLX Liquid Tight fittings and suitable for industrial, commercial, and outdoor applications with enhanced corrosion resistance.
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$144.80 $119.60
Nickel-plated brass locknut M50 by Cabac designed for securing conduit fittings with CABFLX Liquid Tight fittings. High-quality brass with nickel plating for enhanced corrosion resistance in industrial and outdoor applications.
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$2.30 $1.90
The Cabac Fitting Locknut Nickel Plated Brass M32 is designed for securing threaded fittings into knocknuts and fixing holes, offering high mechanical and UV protection for reliable electrical conduit installations.
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$96.50 $79.80
Nickel-plated brass locknut M40 by Cabac designed for securing conduit fittings with CABFLX Liquid Tight fittings. High corrosion resistance suitable for industrial, commercial, and outdoor use.
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$2.50 $2.00
The Cabac Nylon 6 M40 Locknut in black is designed for securing non-metallic fittings into knockouts, offering high UV protection, fire safety, and durability for electrical conduit applications.
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$0.20 $0.10
Lock nut brass 12.0mm made from durable brass metal, perfect for securing bolts and fasteners in various applications. Ideal for construction and industrial use, it offers corrosion resistance and long-lasting durability.
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$0.40 $0.30
Lock nut made from durable brass metal, measuring 20.0mm—ideal for securing bolts and fasteners in construction and industrial applications. Built for reliable fastening, with corrosion resistance and recyclable material for environmental benefits.
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$0.90 $0.70
Lock nut brass 25.0mm made from durable brass metal, perfect for various fastening needs. Ideal for construction and industrial applications, this single pack offers reliable performance and corrosion resistance.
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Lock It In: A Sparky's Guide to Conduit Locknuts

A conduit fitting is only as secure as the nut that's holding it tight. A loose connection that vibrates over time isn't just unprofessional—it's a future point of failure. The humble electrical locknut is the essential component that guarantees a rock-solid, vibration-proof fastening for your conduit entries into switchboards, junction boxes, and enclosures.

At SCHNAP, our Locknuts range offers Aussie tradies and contractors reliable, top-quality fittings for every electrical setup, from a standard domestic fit-out to the toughest industrial site.

Choosing the Right Locknut Material for the Job

Selecting the right material for the environment is key to a long-lasting, compliant installation.

  • Durable Nylon Locknuts: The versatile and cost-effective choice for securing PVC fittings into PVC or plastic enclosures. They are naturally corrosion-free and easy to work with, making them a staple in any sparky's kit.
  • Machined Brass Locknuts: The industry standard for a secure mechanical and electrical earth continuity bond. When you're connecting metal conduit fittings to a steel switchboard or enclosure, a brass locknut is the professional's choice. Our range includes Clipsal-compatible gear you can rely on.
  • Marine-Grade 316 Stainless Steel Locknuts: For the toughest Aussie conditions, you need the ultimate in corrosion resistance. For installations in coastal, marine, or highly corrosive industrial environments (like food processing plants), 316 stainless steel locknuts offer unparalleled long-term performance and prevent rust.

A Size for Every Conduit

From a small 12mm lighting circuit right up to a heavy-duty 63mm sub-main, we've got the right size locknut to suit any standard Australian conduit application.

Trusted Brands for a Secure Fastening

A secure connection starts with quality parts. We stock a huge range of locknuts from the brands that Aussie sparkies trust on their jobs every day, including Tradepro's corrosion-resistant solutions and other industry leaders like Matelec.

Why Sparkies Choose SCHNAP

Don't let a cheap, low-quality nut compromise your professional installation.

  • A complete range of nylon, brass, and 316 stainless steel locknuts.
  • Sizes from 12mm to 63mm to suit any conduit application.
  • Trusted brands built for tough Aussie conditions.
  • Fast delivery and competitive trade pricing.

For the rock-solid locknuts you need to keep your connections tight and your installs compliant, trust SCHNAP to have you covered.

Need locknuts at the best prices and good quality? Shop now at Schnap