Brass Nuts – Hex Nuts, Square Nuts, Coupling Nuts and More by A1 Metallics
A1 Metallics is a leading manufacturer and exporter of brass nuts in all standard and custom configurations. Our brass nut range covers hex nuts, square nuts, coupling nuts, wing nuts, T-nuts, flange nuts, acorn nuts, and specialty brass nuts—all produced to ASTM, DIN, ISO, and BS standards for the US and international markets.
Brass nuts offer a compelling combination of corrosion resistance, electrical conductivity, non-magnetic properties, and ease of machining. They are widely preferred in electrical panels, plumbing systems, instrumentation, marine equipment, and consumer electronics across the USA.
Brass Hex Nuts
Brass hex nuts are the most commonly used fasteners in electrical and plumbing applications. A1 Metallics manufactures brass hex nuts in metric (M2 to M64), UNC, UNF, and BSP thread forms to DIN 934, ISO 4032, ASME B18.2.2, and BS 1083 standards. We stock and supply brass hex nuts in free-cutting brass (C36000/CuZn39Pb3) for maximum corrosion resistance and dimensional accuracy. Common applications include terminal block mounting, cable gland locking, and water pipe connections.
Brass Square Nuts
Brass square nuts provide a large bearing area and resist rotation in channels and T-slots. A1 Metallics produces brass square nuts to DIN 562, DIN 557, and ASME B18.2.2 standards in metric and inch thread sizes. Applications include woodworking machinery, display systems, and embedded nut applications in plastic and composite assemblies.
Brass Coupling Nuts (Long Nuts)
Brass coupling nuts (also called extension nuts or long nuts) join two threaded rods or extend bolt lengths. Available in metric (M4 to M20), UNC, and UNF thread forms per DIN 6334 and ASME B18.2.2. Widely used in electrical installations, antenna mounts, and threaded rod assembly systems across industrial and residential construction in the USA.
Brass Wing Nuts
Brass wing nuts allow hand-tightening without tools, ideal for applications requiring frequent adjustment or removal. Manufactured to DIN 315 and ASME B18.17 in M4 to M12 metric and #8-32 to 3/4″-10 UNC. Common in laboratory equipment, musical instrument stands, lighting fixtures, and outdoor displays.
Brass Flange Nuts
Brass flange nuts incorporate an integral washer flange that distributes load and prevents loosening. Available in serrated and non-serrated flange versions per DIN 6923 and ISO 4161 in M4 to M20. Popular in automotive electronics, plumbing manifolds, and electrical enclosure assembly.
Brass Acorn Nuts (Dome Nuts / Cap Nuts)
Brass acorn nuts (also called cap nuts or dome nuts) provide a decorative finish and protect thread ends from damage and contamination. Manufactured to DIN 1587 in metric M4 to M16. Used in electrical panel terminations, decorative fixtures, pool equipment, and marine hardware.
Brass Nyloc Nuts (Nylon Insert Lock Nuts)
Brass nyloc nuts feature a nylon insert that provides positive locking even under vibration. Manufactured to ISO 7042, DIN 985, and ASME B18.16.6 standards. The nylon insert is rated to 120°C. Brass nyloc nuts are used extensively in automotive electronics, HVAC systems, and consumer appliances in the US market.
Brass T-Nuts and Insert Nuts
Brass T-nuts and threaded insert nuts for wood, plastic, and composite materials provide strong threads in soft substrates. Commonly used in furniture, electronics housing, robotic platforms, and marine composite panels. Available with knurled body, flanged T-nut, and pronged T-nut designs in M4 to M12.
Brass Alloy Grades for Nuts – International Standards
| Alloy / Grade | UNS (USA) | BS (UK) | DIN / EN (Europe) | IS (India) | Characteristics |
|---|---|---|---|---|---|
| Free-Cutting Brass (CZ121) | C36000 | CZ121 | CuZn39Pb3 / 2.0401 | IS 319 Gr 1 | Best machinability; standard hex nuts |
| High Tensile Brass (HTB1) | C67500 | HTB1 | CuZn37Al1 / 2.0461 | — | Higher strength; structural fasteners |
| Naval Brass | C46400 | CZ112 | CuZn38Sn1 / 2.0530 | — | Marine environment nuts |
| Lead-Free Brass | C69300 / C87850 | — | CuZn21Si3P | — | Potable water applications; low lead |
Brass Nut Specifications and Thread Forms
- Metric: M2, M3, M4, M5, M6, M8, M10, M12, M16, M20, M24 per DIN 934 / ISO 4032
- UNC (Unified Coarse): #4-40, #6-32, #8-32, #10-24, 1/4″-20, 5/16″-18, 3/8″-16, 1/2″-13, 5/8″-11, 3/4″-10
- UNF (Unified Fine): #4-48, #6-40, #8-36, #10-32, 1/4″-28, 5/16″-24, 3/8″-24
- BSP / BSPP / BSPT: 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″
- Special threads: MJ, UNJF, BA, and custom thread forms available on request
Why Choose A1 Metallics for Brass Nuts?
- Large Range: Over 500 standard brass nut configurations in stock; custom sizes made to order
- ASTM / DIN / BS Certified: All brass nuts supplied with material certificates per relevant standards
- Precision Machined: Cold forged or CNC machined from premium free-cutting brass bar
- Custom Threading: Any thread form including NPT, BSPT, and special pitch threads
- Surface Finishes: Plain brass, tin plated, nickel plated, zinc plated available
- Competitive Pricing: Direct manufacturer pricing with no middleman markup
- ISO 9001:2015 Quality Management System
- Fast Delivery to USA: Stock items ship within 2 weeks; custom nuts in 3–4 weeks
Frequently Asked Questions – Brass Nuts
Q1: What is the standard brass alloy used for hex nuts?
Free-cutting brass (C36000 / CuZn39Pb3 / DIN CZ121) is the most commonly used alloy for brass hex nuts due to its excellent machinability, good corrosion resistance, and dimensional stability. For marine and high-corrosion applications, naval brass (C46400) or lead-free brass is preferred.
Q2: Can brass nuts be used with stainless steel bolts?
Yes, brass nuts are commonly used with stainless steel bolts. The combination provides good corrosion resistance. However, in highly corrosive marine environments, it is advisable to use stainless steel or silicon bronze bolts/nuts combinations to avoid galvanic corrosion between dissimilar metals.
Q3: Are your brass nuts RoHS and REACH compliant?
Yes. Our standard brass nuts are manufactured from RoHS-compliant brass alloys. For lead-sensitive applications (potable water, children’s products), we can supply lead-free brass nuts in C69300 or similar lead-free alloys. RoHS declarations are available with each shipment.
Q4: What is the minimum order for custom brass nuts?
For standard DIN/ISO/ASME brass nuts in our catalog, MOQ starts from 500 pieces. For fully custom designs with special threads or non-standard dimensions, MOQ is 1,000–2,000 pieces with a tooling cost for the form tools.
Q5: Do you offer plating options for brass nuts?
Yes. Available plating options include bright tin plating (ASTM B545), matte tin, nickel plating (ASTM B689), zinc electroplating, and silver plating. Tin plating is the most popular for electrical and plumbing applications in the US market.
Q6: What certifications do you provide with brass nuts for the US market?
We provide: Certificate of Conformance to ASTM/DIN/BS standards, Material Test Reports, RoHS Declaration, dimensional inspection reports, and packing lists. We can also arrange SGS or Bureau Veritas third-party inspection for large orders.
Order Brass Nuts from A1 Metallics
A1 Metallics is your reliable source for brass nuts of all types—from standard hex nuts to specialty insert nuts and lock nuts. Contact us with your specifications and receive a competitive quote within 24 hours. We supply US distributors, electrical contractors, plumbing wholesalers, and industrial manufacturers with consistent quality at factory-direct prices.