Brass Conduit Fittings — Locknuts, Bushes & Cable Entry Fittings

Jamnagar Brass Components manufactures a comprehensive range of brass conduit fittings for rigid metallic conduit systems used in commercial, industrial, and hazardous-area electrical installations. Our fittings are available in metric, BSP, and NPT thread forms and finished in nickel-plated brass (CW614N) for enhanced corrosion resistance.

Brass Conduit Fitting Types

Our range includes brass locknuts for securing conduit entries into enclosures and junction boxes, hexagon bushes used as reducers between conduit sizes, male adaptors for connecting conduit to threaded ports on equipment, female adaptors for conduit-to-female-thread connections, running couplers for joining two conduit sections, check nuts for locking conduit fittings in position, and cable entry fittings and grommets for neat, sealed cable entries into enclosures.

Materials and Finish

The primary material is CW614N (CZ132) nickel-plated brass, which provides a bright, corrosion-resistant finish suitable for both indoor and outdoor conduit installations. For more aggressive environments, we also offer fittings in CW602N DZR brass with nickel plating, and in natural brass (unplated) for applications where appearance is not critical.

Thread Standards

We manufacture conduit fittings in three main thread standards. Metric threads (M-thread) to ISO 68 are used throughout continental Europe. BSP (British Standard Pipe) threads to BS 21 and BS EN ISO 228 are used in UK conduit systems. NPT (National Pipe Thread) to ANSI/ASME B1.20.1 is the standard for North American conduit installations. We can also produce combined metric/BSP adaptor fittings for mixed-standard installations.

Standards and Approvals

Our brass conduit fittings are manufactured to BS EN 61386 (conduit systems for cable management) and UL 514B requirements. Our quality management system is certified to ISO 9001:2015. Material test certificates and dimensional inspection reports are provided with each shipment.

Why Choose Jamnagar Brass Components?

We supply brass conduit fittings to electrical wholesale distributors, cable management system manufacturers, and electrical contractors across the USA, UK, and Middle East. Our high-volume production capabilities, competitive India-based pricing, and established export track record make us a reliable long-term supply partner. Contact us for a quotation on standard or custom brass conduit fittings.

Frequently Asked Questions — Brass Conduit Fittings

Q1: What are brass conduit fittings used for?

Brass conduit fittings (locknuts, bushes, and cable entry fittings) are used to terminate and seal conduit entries into electrical enclosures, junction boxes, panels, and equipment housings. They clamp the conduit to the enclosure wall, provide strain relief for cables, and in IP-rated versions, seal against dust and moisture ingress. Brass is preferred for its corrosion resistance and reliable mechanical grip on conduit threads.

Q2: What thread standards are available on brass conduit fittings?

Brass conduit fittings are available in all standard conduit thread forms: metric M-thread (M20, M25, M32, M40, M50, M63 per ISO 6 H/6g), PG-thread (Panzergewinde: PG7, PG9, PG11, PG13.5, PG16, PG21, PG29, PG36, PG42, PG48 per DIN 40430), NPT (National Pipe Taper per ASME B1.20.1), and BSP (British Standard Pipe per ISO 228). We also manufacture G-thread and NPT-to-metric combination fittings.

Q3: What IP ratings are achievable with brass cable entry fittings?

Brass cable entry fittings with elastomeric (EPDM or NBR) sealing inserts achieve IP54 (dust partial/water splash) as standard, with IP65, IP66, IP67, and IP68 ratings available for sealed versions with compression-sealing gland design. Hazardous area cable glands meeting ATEX and IECEx Zone 1/2 and Zone 21/22 requirements are available in brass for gas and dust explosive atmospheres.

Q4: What is the difference between a brass locknut and a brass bush?

A brass locknut (or conduit locknut) is a thin hexagonal or knurled ring nut that is threaded onto the conduit from inside the enclosure to clamp the conduit firmly to the enclosure wall, engaging the conduit thread. A brass bush (or conduit bush) threads onto the inside conduit end to protect cable insulation from the sharp cut conduit threads, providing a smooth rounded entry for cables pulled through the conduit.

Q5: Are brass conduit fittings suitable for explosive atmospheres (ATEX/IECEx)?

Standard brass conduit fittings are not ATEX-certified. For hazardous area applications (Zone 1, Zone 2 gas; Zone 21, Zone 22 dust), special ATEX/IECEx certified brass cable glands with certified Ex e or Ex d sealing properties are required. We supply ATEX cable glands certified by SIRA, PTB, or equivalent notified bodies, with Group IIC, IIB+H2 certifications for the most demanding explosive gas atmospheres.

Q6: What sizes do brass conduit fittings come in?

Brass conduit fittings are available for all standard conduit sizes: M16 to M63 metric conduit, PG7 to PG48, 1/2 inch to 2 inch NPT/BSP. The M20 and M25 metric sizes are the most common for instrumentation and control cabling; PG16 and PG21 are common in European industrial equipment; 3/4 inch NPT and 1 inch NPT are standard in USA industrial applications.

Q7: Can brass conduit fittings be supplied with nickel plating?

Yes. Electroless nickel plated brass conduit fittings (5–15 µm) are available for applications requiring enhanced corrosion resistance in damp, chemical, or outdoor environments. Nickel plating provides a uniform, hard coating that resists corrosion significantly better than bare brass in salt spray and aggressive industrial atmospheres. All plated fittings are tested to thread dimensional compliance after plating to ensure assembly compatibility.

Q8: What is the torque requirement for installing brass locknuts?

Installation torque for brass conduit locknuts depends on conduit size and application: M20 locknuts typically require 10–15 Nm; M25 locknuts 15–20 Nm; M32 20–25 Nm. For IP-rated sealing, the gland nut torque per the manufacturer’s installation guide must be followed to compress the sealing insert to the correct deflection. Over-torquing can damage the brass thread; under-torquing leaves the sealing ineffective.

Q9: Are EMC (electromagnetic compatibility) brass conduit fittings available?

Yes. EMC brass cable glands with 360-degree earthing/grounding of the cable shield/screen are available for shielded cables in sensitive electronic equipment. The EMC gland design clamps the cable screen circumferentially to the enclosure, providing continuous RF shielding across the cable entry point. Essential for protecting sensitive instrumentation, PLCs, and communication equipment from radiated and conducted EMI.

Q10: What is the lead time and minimum order for brass conduit fittings?

Standard brass locknuts, bushes, and cable glands in common sizes (M20, M25, M32, PG16, PG21, 3/4 NPT) are typically in stock for immediate shipment. Non-standard sizes and IP-rated versions: 1–3 weeks. Custom designs: 4–6 weeks. Minimum order: no minimum for stock items; 100 pieces for non-stock sizes; 500 pieces for custom manufactured fittings. Export pricing to USA/UK includes competitive rates with air or sea freight options.