What Are Brass Conduit Fittings and What Do They Do?

Brass conduit fittings are precision-machined connectors used to join one piece of conduit to another, or to terminate conduit at an electrical box, junction box, control panel or machine. Together, the conduit and its fittings form a continuous protective route that carries and shields electrical cables from impact, moisture, dust and chemical exposure. A brass conduit fitting is the point where the mechanical protection of the conduit system meets the enclosure, so its sealing quality and mechanical strength determine whether the whole cable route stays reliable.

Typical brass conduit fittings are assembled from a machined body, a sealing ring or O-ring, a ferrule that grips the conduit profile, a compression or gland nut, and a locknut that secures the fitting to the enclosure wall. Some designs add an insulating throat or liner that protects cable jackets from the cut metal edge, and a ground cone or ferrule that maintains electrical bonding continuity through the fitting.

This guide answers the questions buyers ask most often: what these fittings are, why brass is used, which types exist, which specifications matter, and how to install and select them correctly.

Why Brass Conduit Fittings?

Conduit fittings are available in zinc alloy, nylon, stainless steel and brass. Brass is the most widely specified for demanding industrial duty because it balances several properties at once:

• Corrosion resistance. Nickel-plated brass withstands wet, humid and mildly corrosive environments, including power plants, petrochemical facilities, food and beverage plants and pharmaceutical sites.
• Mechanical strength. Machined brass bodies and threads handle vibration, impact and repeated assembly without cracking.
• Electrical continuity. Brass is conductive, so metallic conduit systems terminated with brass fittings maintain a reliable bonding and grounding path.
• Temperature tolerance. Brass fittings operate across a wide temperature range, well beyond what nylon can handle.
• Cost effectiveness. Brass delivers most of the corrosion performance of stainless steel at a significantly lower price, making it the value choice for corrosive but not extreme environments.

If you are weighing brass against stainless steel as a material family, our comparison of brass versus stainless steel cable glands explains the trade-offs in detail.

Types of Brass Conduit Fittings

Conduit systems change direction, terminate at equipment and transition between conduit types, and each situation uses a different fitting.

For a right-angle change of direction, a 90 degree elbow conduit fitting is the component you need: one end couples to the flexible metallic or liquid-tight conduit, and the threaded end fixes into the box, switch enclosure, distribution board or motor terminal. The 90° profile is particularly useful where space is limited and a straight fitting would not fit.

Where the cable route uses flexible hoses or corrugated tubing, a brass hose connector MH series couples standard flexible hoses to equipment with an IP65 seal and a working range of -40°C to +100°C, while a brass hose connector BH series handles AD-size corrugated conduit. For flexible metallic conduit systems, a brass flexible cable gland terminates the conduit at the enclosure with an insulating liner that protects the cable from the cut edge, and positively bonds the conduit to the box for grounding continuity.

Key Specifications to Check

When you compare brass conduit fittings, four specifications decide whether the fitting matches your system:

• Thread type and size. Metric threads (per EN 60423), PG, NPT and G/BSP are all in use, and the fitting thread must match the enclosure entry or knockout. Common sizes run from M12 to M63 in metric, and 3/8″ to 2″ in NPT.
• Conduit profile. Flexible metallic conduit, liquid-tight flexible conduit and corrugated tubing each have their own profile, and the ferrule must match the conduit you use. Check the fitting’s nominal conduit size or AD dimension.
• Ingress protection. Brass conduit fittings are typically rated IP65 to IP68 depending on the seal design. Choose based on whether the installation is dry, damp, washed down or submerged.
• Temperature range. Sealing materials, not the brass body, set the limit. Standard NBR or TPV seals typically cover -40°C to +100°C, with short-term peaks higher.

Common Applications

Brass conduit fittings protect wiring in environments where plastic fittings would not last:

• Power generation plants and power transmission systems
• Petrochemical, food, beverage and pharmaceutical plants
• Machine tools, robot assembly and automation lines
• Automotive manufacturing and transportation systems
• High-voltage signs and exterior lighting
• HVAC equipment and building services
• Marine and coastal installations with salt exposure

In these settings the fitting must do more than hold the conduit in place: it must keep water and dust out of the enclosure, hold the cable securely against vibration, and keep the metallic conduit system electrically bonded.

How to Install Brass Conduit Fittings

Installation is straightforward when the parts are handled in the right order:

1. Cut the conduit square. Non-metallic conduit can be cut with a conduit cutter. Metallic conduit should be cut with a fine-tooth hacksaw or bandsaw, and the cut must be straight and vertical so the ferrule seats evenly.
2. Assemble the fitting. Slide the sealing nut onto the conduit first, followed by the ring in the correct orientation. Push the ferrule over the end of the conduit, then screw on the main body with its O-ring. Tighten the locknut at the end to compress the seal onto the conduit profile.
3. Connect to the enclosure. Screw the assembled conduit and fitting into the box or housing until it is seated, then secure it and tighten to the recommended torque without over-tightening.

How to Choose the Right Brass Conduit Fitting

Work through the installation before you order:

1. Identify the conduit type. Flexible metallic, liquid-tight or corrugated conduit determines the fitting family you need.
2. Match the thread to the enclosure. Confirm whether the entry is metric, PG, NPT or G, and the exact thread size.
3. Check the required IP rating. Match the fitting’s ingress protection to the wettest condition on site.
4. Confirm temperature and chemical exposure. Check that the seal material suits the environment, especially for hot washdown or chemical areas.
5. Order locknuts and accessories in the same lot. Fittings, locknuts and seals from one supplier guarantee a matched system.

Conclusion

Brass conduit fittings are the connecting pieces that turn a length of conduit into a complete cable protection system. They terminate, join and change the direction of conduit runs, seal the entry into electrical enclosures, and maintain grounding continuity through metallic systems. Nickel-plated brass is the material of choice for wet, corrosive and mechanically demanding environments, and choosing the right thread, conduit profile, IP rating and temperature range ensures the fitting performs for the life of the installation.

If you are specifying conduit fittings for an industrial, food, pharmaceutical or outdoor project, contact us with your conduit type, thread and environment, and we will recommend the right brass conduit fitting for your cable route.

FAQ

What is a brass conduit fitting used for?

A brass conduit fitting connects one piece of conduit to another, or terminates conduit at an electrical box, junction box, panel or machine. It protects the cable at the connection point, seals the enclosure entry against dust and water, and maintains grounding continuity in metallic conduit systems.

What is the difference between a conduit fitting and a cable gland?

A cable gland terminates and seals a cable directly at an enclosure, clamping on the cable jacket. A conduit fitting terminates a conduit, which then protects the cable along its route. In some designs the two overlap, for example a flexible conduit gland that both bonds the conduit and protects the cable at the entry point.

Are brass conduit fittings waterproof?

Most brass conduit fittings are rated IP65 to IP68 depending on the seal design. IP65 covers low-pressure jets and rain, IP67 covers temporary immersion at 1 metre for 30 minutes, and IP68 covers continuous immersion at a manufacturer-defined depth. Check the datasheet rating for the exact condition.

What thread types are available for brass conduit fittings?

Brass conduit fittings are produced in Metric (per EN 60423), PG, NPT and G/BSP threads. The fitting thread must match the enclosure entry or knockout, so confirm the thread standard and size before ordering.

Can brass conduit fittings be used outdoors?

Yes. Nickel-plated brass is corrosion resistant and suits outdoor, coastal and washdown environments. For direct seawater exposure or extreme chloride environments, stainless steel fittings may be required instead.

How do I choose the right size brass conduit fitting?

Match the fitting to three dimensions: the conduit profile or nominal size (including AD size for corrugated tubing), the thread size of the enclosure entry, and the cable diameter if the fitting also clamps the cable. When in doubt, provide all three to the manufacturer and they will specify the correct size.