Brass Lock Nuts and Brass Panel Nuts – Precision Fastening Solutions by A1 Metallics
A1 Metallics is a specialized manufacturer of brass lock nuts and brass panel nuts for electrical, electronic, instrumentation, and plumbing applications. Our brass lock nut and panel nut range is trusted by US electrical OEMs, panel builders, enclosure manufacturers, and plumbing distributors for its consistent dimensional accuracy, excellent thread quality, and corrosion resistance.
Brass Lock Nuts
Brass lock nuts prevent unintentional loosening of threaded connections under vibration and dynamic loads. A1 Metallics manufactures several types of brass lock nuts to match different application requirements:
Brass Nylon Insert Lock Nuts (Nyloc Nuts)
Brass nyloc nuts use a nylon insert to grip the bolt thread and prevent loosening. Produced to ISO 7042, DIN 985, and ASME B18.16.6. The nylon insert withstands temperatures up to 120°C and provides a prevailing torque of 0.3–1.2 Nm depending on size (M4–M20). Commonly used in automotive electronics, HVAC controllers, and vibrating machinery in the USA.
Brass All-Metal Lock Nuts (Jam Nuts / Prevailing Torque Nuts)
All-metal brass lock nuts maintain their locking effectiveness at temperatures above 120°C where nylon inserts would fail. These include distorted-thread type and slotted-flange types. Produced per ISO 2320 and ASME B18.16.3M. Applications include motor terminal blocks, high-temperature electrical equipment, and instrumentation in refineries and chemical plants across the USA.
Brass Slotted Hex Lock Nuts (with Cotter Pin)
Slotted brass hex nuts (castle nuts) are used with a cotter pin to provide positive mechanical locking in safety-critical applications. Manufactured to ASME B18.2.2 and DIN 935. Available in UNC and metric thread forms for use in agricultural machinery, pump assemblies, and fluid power systems.
Brass Panel Nuts (Thin Hex Nuts / Flat Nuts)
Brass panel nuts—also called thin hex nuts, flat nuts, or lock nuts for fittings—are widely used to secure cable glands, conduit fittings, push buttons, switches, and toggle switches to electrical panels. Their reduced height profile (approximately half the height of a standard hex nut) allows fitting through panel cutouts where a full hex nut would not fit.
Brass Cable Gland Lock Nuts
Brass cable gland lock nuts secure cable glands (cable fittings) to electrical enclosures and junction boxes. Available in PG thread sizes (PG7 to PG48), metric thread sizes (M12 to M63), and NPT thread sizes (1/2″ to 2″). PG thread cable gland nuts are manufactured to DIN EN 60423. Metric cable gland nuts comply with IEC 60947-5-1 for electrical apparatus enclosures.
Brass Conduit Lock Nuts (Locknut for Conduit)
Brass conduit lock nuts are used with EMT, RMC, and IMC conduit connectors in electrical installations to secure conduit fittings to electrical boxes and panels. Manufactured per UL 514B and ANSI/NEMA FB 1 for the US electrical conduit market. Available in 1/2″ to 4″ trade sizes.
Brass Panel Nuts for Switches and Components
Thin brass hex nuts for panel-mounted switches, push buttons, potentiometers, toggle switches, and indicator lights. Standard thread sizes include M7×0.75, M8×0.75, M10×1.0, M12×1.0, M16×1.0 and corresponding UNF equivalents. The reduced profile allows multiple components to be mounted close together on crowded electrical panels.
Brass Conduit Fittings Lock Nuts for NPT Applications
For NPT-threaded conduit and piping applications in the US electrical and plumbing sector, A1 Metallics manufactures brass NPT lock nuts in 1/4″ NPT through 4″ NPT sizes. These are used with electrical conduit hubs, explosion-proof fittings, and plumbing adapters where secure panel mounting is essential.
Material Grades for Brass Lock Nuts and Panel Nuts
| Alloy | UNS (USA) | BS (UK) | DIN / EN (Europe) | Tensile Strength | Application |
|---|---|---|---|---|---|
| Free-Cutting Brass | C36000 | CZ121 | CuZn39Pb3 / 2.0401 | 340–420 MPa | Standard electrical panel nuts |
| High Tensile Brass | C46400 / C67500 | HTB1 / CZ112 | CuZn38Sn1 / 2.0530 | 500–600 MPa | Marine and high-load lock nuts |
| Lead-Free Brass | C69300 | — | CuZn21Si3P | 400–500 MPa | Potable water lock nuts (NSF-approved) |
Thread Forms Available
- Metric: M3, M4, M5, M6, M7, M8, M10, M12, M16, M20 (standard and fine pitch)
- UNC / UNF: #6-32, #8-32, #10-24, 1/4-20, 5/16-18, 3/8-16, 1/2-13 and fine equivalents
- NPT: 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″
- PG (German conduit thread): PG7, PG9, PG11, PG13.5, PG16, PG21, PG29, PG36, PG42, PG48
- BSP / G Thread: G1/8, G1/4, G3/8, G1/2, G3/4, G1, G1-1/4, G1-1/2, G2
Why Choose A1 Metallics for Brass Lock Nuts and Panel Nuts?
- Specialized Electrical Fastener Range: Decades of experience supplying brass electrical fasteners to US panel builders and electrical OEMs
- UL/ANSI Compliant Conduit Lock Nuts: Manufactured to UL 514B and ANSI/NEMA FB 1 for US electrical market
- PG Thread Expertise: Complete PG thread range for DIN EN 60423 compliant cable gland installations
- Custom Sizes: Non-standard thread forms and special dimensions manufactured to customer drawings
- ISO 9001:2015 Certified Quality System
- RoHS / REACH Compliant
- Competitive Factory Pricing from India with fast ocean and air freight to USA
Frequently Asked Questions – Brass Lock Nuts and Panel Nuts
Q1: What is the difference between a brass lock nut and a brass panel nut?
A brass lock nut is designed to prevent thread loosening, typically through a nylon insert (nyloc), distorted thread, or slotted design. A brass panel nut is a thin hex nut specifically designed for panel mounting of electrical components and fittings—its reduced height allows it to fit through panel cutouts and is typically tightened from the back of the panel to secure a fitting.
Q2: What thread sizes are available for brass cable gland lock nuts?
We supply cable gland lock nuts in PG thread sizes (PG7–PG48 per DIN EN 60423), metric thread (M12×1.5 to M63×1.5 per IEC), and NPT thread (1/2″ to 2″). Custom sizes are also available.
Q3: Are your brass conduit lock nuts UL listed?
Our brass conduit lock nuts are manufactured to UL 514B and ANSI/NEMA FB 1 specifications. Please note that UL listing is a process that end-product manufacturers pursue; however, our parts meet all dimensional and material requirements of the relevant UL and ANSI standards for use in UL-listed conduit assemblies.
Q4: Can you supply brass panel nuts for M7×0.75 toggle switch threads?
Yes. M7×0.75 is a standard panel nut size for toggle switches and is one of our standard stocked sizes. We also supply M8×0.75, M10×1.0, M12×1.0, and M16×1.0 panel nuts in standard and nickel-plated finishes commonly used in US industrial control panels.
Q5: What is the minimum order quantity for brass lock nuts?
For standard catalog sizes, MOQ starts from 500 pieces. For custom or non-standard brass lock nuts, MOQ is 1,000 pieces. We welcome trial orders from new customers for qualification purposes.
Request a Quote for Brass Lock Nuts and Panel Nuts
Contact A1 Metallics for competitive pricing on brass lock nuts, brass panel nuts, brass cable gland lock nuts, and brass conduit lock nuts. We serve US electrical panel builders, OEM equipment manufacturers, electrical distributors, and plumbing wholesalers with reliable supply and quality documentation. Get your quote in 24 hours.