Brass Panel Nuts – Conduit Lock Nuts | Manufacturer & Exporter from India
We are one of the leading manufacturers, suppliers and exporters of Brass Panel Nuts and Brass Conduit Lock Nuts from India. We have been supplying Brass Panel Nuts to the world market for 3 decades. Brass Panel Nuts — also known as Brass conduit lock nuts, Brass entry lock nuts, Brass cable gland lock nuts, Brass chase nipple nuts, or Brass grommet nuts — are thin-body hexagonal or round nuts specially designed to secure cable glands, conduit fittings, and cable entry devices in panel cutouts. Their compact, low-profile design allows them to grip the panel material firmly from the inside while the cable gland body is tightened from outside, creating a secure, vibration-resistant assembly. We manufacture Brass Panel Nuts in metric, BSP (British Standard Pipe), and PG (Panzergewinde/cable gland thread) profiles to suit the full range of standard cable glands and conduit connectors. Our ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certified manufacturing facility, backed by three decades of global export experience, ensures every Brass Panel Nut meets the dimensional and functional requirements of demanding electrical installation projects worldwide.
Overview
In industrial electrical installations, cable management systems, and enclosure assembly, a panel nut is an essential component that locks a cable gland, conduit entry, or adapter bushing securely to a metal or plastic panel. Without a properly tightened panel nut, cable glands can rotate or loosen under cable tension, vibration, or thermal cycling — compromising the IP-rated seal of the enclosure and potentially creating safety hazards. Brass Panel Nuts are preferred over zinc die-cast or mild steel equivalents due to Brass’s inherent corrosion resistance, good mechanical strength, and compatibility with Brass cable gland bodies — avoiding galvanic corrosion that can occur when dissimilar metals are in contact in moist environments.
Three principal thread forms are used for cable glands and conduit fittings worldwide: metric (M-thread, as per DIN/ISO), BSP (British Standard Pipe, as per BS 2779/ISO 228), and PG thread (Panzergewinde, a legacy European cable gland thread still widely used in Germany, France, and other European countries). Our Brass Panel Nuts cover all three systems in a comprehensive size range from metric M12 to M75, BSP 3/8″ to 2″, and PG7 to PG48.
In addition to the standard hexagonal profile, we manufacture round (circular) panel nuts with flat or knurled outside profiles for installation in round cutouts where a spanner cannot be applied — installation being accomplished by a panel nut wrench (spanner key). For ATEX and explosion-proof applications, we supply panel nuts certified to the appropriate material specification as confirmed by the equipment manufacturer.
| Standard | Grade | Cu% | Pb% | Zn% | Remarks |
|---|---|---|---|---|---|
| India IS 319 | Grade 1 Free-Cutting Brass | 57–59 | 2.5–3.5 | Bal. | Standard machining grade |
| Europe EN 12164 | CW614N (CuZn39Pb3) | 59 | 3.0 | Bal. | Standard European CNC grade |
| Europe (DR) | CW608N (CuZn36Pb2As) | 63 | 1.5–2.0 | Bal. | Dezincification-resistant for damp environments |
| USA ASTM B16 | C36000 | 60–63 | 2.5–3.7 | Bal. | Standard US free-cutting Brass |
| UK BS 2874 | CZ121 | 57–59 | 2.5–3.5 | Bal. | British equivalent to IS 319 |
| Germany DIN 17660 | CuZn39Pb3 / Ms58 | 57–60 | 2.5–3.5 | Bal. | Standard German grade |
| Japan JIS H 3250 | C3604 | 59–63 | 1.8–3.7 | Bal. | Japanese free-cutting Brass |
| China GB/T 4423 | HPb59-1 | 57–61 | 0.8–1.9 | Bal. | Chinese equivalent |
Manufacturing Process
Brass Panel Nuts are primarily machined from solid Brass rod or hexagonal Brass bar on CNC multi-spindle automatic lathes or single-spindle CNC turning centers. The sequence begins with bar stock facing and parting to correct thickness, followed by external hex milling or turning (for hex types), ID boring to the relevant cable gland/conduit thread size, thread cutting (internal) by CNC tapping or thread milling, external thread cutting or knurling (for round conduit nut types), chamfering of thread entry, and deburring in vibratory finishing bowls. The resulting panel nut is then inspected for thread accuracy using calibrated go/no-go plug gauges, and for dimensional compliance using vernier calipers and outside micrometers. Plating (nickel, tin, or chrome) is applied if specified, followed by final visual inspection and packing.
International Standards
Brass Panel Nuts for cable gland applications are manufactured to conform with IEC 62444 (Cable Glands for Electrical Installations), BS 6121 (Mechanical Cable Glands), DIN EN 50262 (Cable Glands for Electrical Installations, European), IS 12943 (Indian Standards for Cable Glands), and related standards. Thread forms conform to BS 2779 / ISO 228 (BSP), DIN 40430 (PG thread), and DIN 13 / ISO 261 (metric coarse thread). Dimensional standards for panel nuts follow manufacturer-specific product datasheets aligned with the above gland standards.
| Thread Size | Suitable for Gland Entry Dia. | O/D Across Flats (mm) | Thickness (mm) | Finish |
|---|---|---|---|---|
| M12 × 1.5 | 5–6 mm | 18 | 4 | Natural Brass / Nickel |
| M16 × 1.5 | 7–10 mm | 22 | 4 | Natural Brass / Nickel |
| M20 × 1.5 | 10–14 mm | 27 | 4 | Natural Brass / Nickel |
| M25 × 1.5 | 13–18 mm | 34 | 5 | Natural Brass / Nickel |
| M32 × 1.5 | 18–25 mm | 42 | 5 | Natural Brass / Nickel |
| M40 × 1.5 | 25–32 mm | 52 | 6 | Natural Brass / Nickel |
| M50 × 1.5 | 32–42 mm | 65 | 6 | Natural Brass / Nickel |
| M63 × 1.5 | 42–54 mm | 80 | 7 | Natural Brass / Nickel |
| M75 × 1.5 | 54–70 mm | 95 | 7 | Natural Brass / Nickel |
| PG Thread | Equivalent Metric Entry (approx.) | O/D Across Flats (mm) | Thickness (mm) |
|---|---|---|---|
| PG7 | M12 | 18 | 4 |
| PG9 | M16 | 20 | 4 |
| PG11 | M20 | 24 | 4 |
| PG13.5 | M20 | 26 | 4 |
| PG16 | M25 | 30 | 5 |
| PG21 | M32 | 38 | 5 |
| PG29 | M40 | 50 | 5 |
| PG36 | M50 | 62 | 6 |
| PG48 | M63 | 80 | 7 |
Plating and Finish Options
Brass Panel Nuts are supplied in natural (self-colour) Brass finish as standard. Nickel plating (electrolytic bright nickel) provides enhanced corrosion resistance and an attractive silver-white finish, widely specified in industrial switchgear and marine applications. Tin plating gives good corrosion resistance and solderability. Chrome plating is available for decorative or architectural applications. RoHS-compliant finishes without hexavalent chrome are standard for all export to Europe and North America.
Tolerances
Internal (cable gland entry) thread: 6H metric, G-class BSP per ISO 228, PG thread per DIN 40430. Thread run-out tolerance: ±0.05 mm TIR. Thickness tolerance: ±0.1 mm. Outside diameter (across flats) tolerance: +0.0 / -0.2 mm. All components are 100% thread-gauged using calibrated go/no-go plug gauges, with dimensional sampling per ISO 2859-1 at AQL 1.0.
Industries Served
Brass Panel Nuts are used in electrical panel board assembly, junction box and enclosure manufacturing, cable tray and conduit installations, ATEX and explosion-proof equipment, marine and offshore installations, power distribution switchgear, transformer rooms, industrial automation panels, OEM electrical equipment, HVAC control panels, and building services installations. Their combination of corrosion resistance, ease of installation, and dimensional consistency makes them the universal choice for securing cable entries in both indoor and outdoor electrical enclosures worldwide.
Turnaround Time
Standard panel nuts for common cable gland sizes (M16–M50 metric, PG7–PG36, BSP 3/8″–1″) are available from stock for prompt dispatch. For full production runs and custom sizes, lead time is 4–6 weeks from order confirmation. Expedited production is available on request for urgent projects.
Packaging and Shipping
Panel nuts are packed in polythene bags with quantity labels (inner pack: 100 or 250 pcs; outer carton: 2,500–10,000 pcs depending on size). Custom packaging with customer-brand labels, part numbers, and barcodes is available. Export by sea freight and air freight to all global destinations.
Why Choose Us Over Other Manufacturers
For three decades we have been the preferred source for Brass Panel Nuts for panel builders, cable gland manufacturers, and electrical equipment OEMs across the UK, Germany, the Middle East, and Australia. Our ability to produce panel nuts in all three thread systems — metric, BSP, and PG — from a single facility eliminates the need to source from multiple vendors. Our customisation capability extends to non-standard flange diameters, serrated or smooth bearing faces, internal compound thread forms, and custom external profiles. We offer private-label packaging and can fulfil vendor-managed inventory (VMI) arrangements for high-volume customers. Being ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certified, our quality system provides the traceability and documentation that electrical equipment manufacturers require for their own quality assurance obligations.
Customer Testimonials
“We source our Brass panel lock nuts exclusively from Cable Glands India. They are the only supplier who can reliably cover our full range of metric, PG, and BSP sizes from one source, with consistent quality and very reasonable prices. Their communication is always prompt and professional.”
— Lars Petersen, Supply Chain Manager, Denmark (EU)
“Cable Glands India has been supplying us with Brass panel nuts for our IP65 enclosure range for over five years. The quality is always spot-on, and when we needed a custom thread profile for a special project, they delivered exactly to our drawing within the agreed lead time. Exceptional supplier.”
— Priya Nair, Procurement Manager, United Kingdom
Frequently Asked Questions (Q&A)
Q1: What is the difference between a panel nut and a regular hex nut?
A panel nut is specifically designed to be thin-bodied (low profile) and has a thread form matching cable gland or conduit fittings rather than standard bolt threads. It is used to clamp a cable gland or conduit connector to a panel from inside, whereas a regular hex nut is used on bolts and studs for general fastening.
Q2: What thread types do Brass Panel Nuts come in?
We supply Brass Panel Nuts in metric (DIN 13 coarse and fine pitch), BSP (British Standard Pipe — G-thread per ISO 228), and PG thread (Panzergewinde per DIN 40430) profiles. Custom and legacy thread forms (NPT, UN, etc.) are available on special order.
Q3: Are PG thread panel nuts still in production?
Yes. Although PG (Panzergewinde) thread has been superseded by metric thread in new installations per IEC 60423, a large installed base of PG-thread cable glands and conduit fittings remains in use globally, particularly in Germany, France, and export equipment produced for European markets. We continue to manufacture PG panel nuts to support maintenance and replacement requirements.
Q4: Can panel nuts be used in ATEX hazardous areas?
Brass panel nuts are generally acceptable in ATEX zones as accessory components to ATEX-certified cable glands, as Brass is non-sparking. However, formal ATEX certification of the panel nut itself is the responsibility of the cable gland manufacturer’s certification body. We can provide material certificates and test reports to support your certification documentation.
Q5: What is the tightening torque for a Brass panel nut?
Recommended tightening torque depends on thread size and panel material. For M20 Brass panel nuts on mild steel panels, typical torque is 12–18 Nm. Over-tightening can distort the panel cutout or strip the Brass threads. Please refer to the cable gland manufacturer’s installation instructions for specific torque values.
Q6: Do you supply panel nuts with serrated faces for anti-loosening?
Yes. We can supply Brass panel nuts with serrated bearing faces (star washer profile on the bearing face) that provide additional anti-rotation resistance when tightened against a metal panel. These are particularly useful in high-vibration installations.
Q7: Can I get panel nuts to match a specific cable gland brand?
Yes. If you share the cable gland manufacturer’s thread specification (thread form, pitch, tolerance class, and entry diameter), we can manufacture matching panel nuts. We are experienced in producing compatible panel nuts for many well-known European and Indian cable gland brands.
Q8: What is the maximum panel thickness a standard panel nut can accommodate?
Standard Brass panel nuts are designed for panel thicknesses of 1.5–3 mm. For thicker panels, we can supply extended-body (deep) panel nuts with greater internal thread depth. Please specify your panel thickness when ordering.
Q9: Are Brass panel nuts compatible with plastic/GRP enclosures?
Yes. Brass panel nuts can be used with GRP (glass reinforced plastic), polycarbonate, and other plastic enclosures. For plastic panels, reduced tightening torque is recommended to avoid cracking the panel material. Use of a back plate or reinforcing plate behind the panel is advised for large cable gland sizes in plastic panels.
Q10: Do you offer Stainless Steel panel nuts?
Yes. We manufacture panel nuts in Stainless Steel (SS304 and SS316) for highly corrosive environments (coastal, marine, chemical process). Contact us with your size requirements for a quotation.
Q11: What certifications are available with your panel nuts?
We provide raw material test certificates (EN 10204 Type 2.2 or 3.1), dimensional inspection reports, and our ISO 9001:2015 quality management certification with each order. RoHS compliance declarations are provided for all products supplied to the EU.
Q12: Can you do custom outside diameters (OD) for panel nuts?
Yes. If your panel cutout requires a specific seating diameter, we can machine panel nuts to a custom outside profile to match. Round panel nuts with a specific OD are common in cable gland assemblies where a neat, flush appearance in the panel is required.
Q13: How do I measure which size panel nut I need?
Measure the thread diameter of the cable gland entry thread (the threaded section that passes through the panel hole) using a thread gauge or by checking the cable gland’s datasheet. The panel nut must have a matching internal thread. Also confirm whether the thread is metric, BSP, or PG to ensure the correct panel nut is selected.
Q14: Do you supply panel nuts in bulk quantities for OEM use?
Yes, we regularly supply panel nuts in bulk quantities (10,000 to 500,000+ pieces per order) to electrical enclosure manufacturers, switchgear OEMs, and cable gland distributors. Volume pricing is available with dedicated production scheduling.
Q15: What is the difference between a panel nut and a locknut in cable gland terminology?
In cable gland terminology, the terms are often used interchangeably. A “panel nut” (or “counter nut”) refers to the thin nut used behind the panel to secure the gland body, while “locknut” in electrical usage typically also refers to this same component. Some manufacturers distinguish between the two by the presence of a serrated face (locknut) versus a plain face (panel nut), but the distinction is not universal.
Glossary of Terms
BSP thread (British Standard Pipe) – A standard thread form (parallel G-thread per ISO 228 or tapered R-thread per ISO 7-1) used on pipe fittings and cable glands in the UK and many Commonwealth countries. PG thread (Panzergewinde) – A legacy German thread standard for cable glands (DIN 40430), named after “armoured thread.” Though being phased out in favour of metric threads, it remains widely used for replacement purposes. IP rating – Ingress Protection rating (IEC 60529); defines the level of protection of an electrical enclosure against solid particles and water; cable glands and panel nuts contribute to maintaining the enclosure’s IP rating. ATEX – European directive for equipment used in explosive atmospheres; Brass (non-sparking) is a preferred material in ATEX-rated installations. Go/No-Go gauge – A plug gauge used to verify internal thread compliance; the Go plug must engage freely, the No-Go must not. Dezincification resistance (DR) – Alloy property preventing selective zinc leaching in contact with water; relevant for panel nuts in damp or outdoor enclosures.
Related Parts
Brass cable gland lock nuts, Brass conduit lock nuts, Brass counter nuts, Brass hexagonal panel nuts, Brass round conduit nuts, Brass PG thread nuts, Brass BSP lock nuts, Brass metric lock nuts, Brass hex nuts, Brass thin nuts, Brass jam nuts, Brass lockring bushings, Brass cable gland bodies, Brass cable gland accessories, Brass sealing plugs, Brass reducer rings
Request a Quote Today
Whether you need standard Brass Panel Nuts in metric, BSP, or PG thread, or require custom-designed panel locking nuts to your specific drawing, our team is ready to help. Contact us with your thread type, size, quantity, and finish requirements and receive a competitive quotation within one business day. Email: sales@cableglandsindia.com | Phone: +91-22-43449300. ISO 9001:2015 | ISO 14001:2015 | ISO 45001:2018 certified manufacturer and exporter of Brass Panel Nuts from India.