Brass Hex Nuts

Jamnagar Brass Components manufactures precision brass hex nuts to international standards including DIN 934 (ISO 4032), ANSI/ASME B18.2.2, and custom drawings — in both metric and imperial thread sizes for the USA, UK, European, and global fastener markets. Our brass hex nuts are produced from free-machining brass CZ121 (C36000) bar stock on multi-spindle CNC nut-forming and turning centres, with 100% thread gauging on all production parts. We supply hardware distributors, OEM fastener users, electrical equipment manufacturers, and plumbing product companies.

Brass Hex Nut Standards — DIN 934, ISO 4032, ANSI B18.2.2

Standard	Region	Thread Type	Thread Range	Width Across Flats
DIN 934 / ISO 4032	Europe / International	ISO metric coarse	M2 – M64	Per ISO 4032 table
DIN 936	Europe	ISO metric, thin nut	M5 – M52	Reduced height (style 0)
ANSI/ASME B18.2.2	USA	UNC / UNF	1/4″ – 4″	Per ASME table (hex and heavy hex)
BS 1083	UK	BSW / BSF	3/16″ – 4″	Whitworth / BSF series
ISO 8673	International	ISO metric fine	M8×1 – M64×4	Same as ISO 4032

Brass Alloy Grades for Hex Nuts — International Equivalents

Grade Name	UNS (USA)	EN (Europe)	BS (UK)	IS (India)	Machinability
Free-Machining Brass	C36000	CW603N / CW614N	CZ121	IS 319 Gr.1	100 (benchmark)
Standard Brass	C27000	CW507L	CZ107	IS 291 Grade 1	70
DZR Brass	C35330	CW602N	CW602N	—	90
Low-Lead NSF 372	C69300	CW724R	—	—	75
Naval Brass	C46400	CW712R	CZ112	IS 291 NB	50

Types of Brass Hex Nuts We Manufacture

Standard Brass Hex Nuts (DIN 934 / ISO 4032)

Full-height metric hex nuts in CZ121 brass, M2 through M64, to ISO 4032 dimensions and tolerance class 6H thread. Width across flats, height, and chamfer per DIN 934 tables. Available bright machined or nickel-plated.

ANSI/ASME B18.2.2 Brass Hex Nuts (Inch)

Hex nuts in UNC and UNF thread forms to ASME B18.2.2, sizes 1/4 inch to 2 inch, in both regular (standard) hex and heavy hex configurations. Also available in 2H heavy hex for structural applications. Thread tolerance class 2B per ASME B1.1.

Thin Hex Nuts / Jam Nuts (DIN 439 / ISO 4035)

Reduced-height (thin) brass hex nuts per DIN 439 / ISO 4035 — used as jam nuts to lock a standard nut, or where axial space is limited. Height approximately 40–50% of a standard nut. Available M4 to M36.

Nyloc-Style Brass Hex Nuts

Brass hex nuts with a nylon insert (nyloc) for vibration-resistant locking without separate lock washer — preferred over all-metal lock nuts where re-usability and lower locking torque are priorities. Nyloc brass nuts per DIN 985 / ISO 7042.

Brass Hex Cap Nuts (Acorn / Dome Nuts)

Decorative cap nuts (acorn nuts / dome nuts) with a closed domed top, covering and protecting exposed bolt thread ends. Used in electrical enclosures, architectural fixtures, furniture, and where aesthetic finish is important. Available M4 to M20 and 1/4 inch to 3/4 inch.

Brass Coupling Nuts (Hex Connector Nuts)

Long hex nuts (coupling nuts) for joining two lengths of threaded rod end-to-end, or extending a bolt thread. Available in standard and heavy hex body, M6 to M30 and 1/4 inch to 1 inch, to DIN 6334 or custom length specifications.

Brass Weld Nuts and Clinch Nuts

Projection weld nuts (DIN 928 style) and clinch (press-in) nuts for attaching to sheet metal components by welding or pressing. Brass weld and clinch nuts are used in electrical enclosure assembly, sheet metal fabrication, and appliance manufacturing.

Applications of Brass Hex Nuts

• Electrical switchgear, panel board, and enclosure assembly
• Plumbing manifolds and pipe fitting locknut applications
• Instrumentation and meter assembly
• Valve packing gland compression
• Architectural and decorative hardware
• Electronics chassis assembly (non-magnetic requirement)
• Marine hardware (corrosion-resistant alternative to steel nuts)
• Cable gland lock nuts on metal enclosures

Why Choose Jamnagar Brass Components for Brass Hex Nuts?

• Multi-standard capability — DIN 934, ISO 4032, ANSI B18.2.2, BS 1083 from one supplier
• 100% thread gauging — plug gauge verification on all threaded nuts before dispatch
• High-speed production — CNC nut-forming with output capacity of 1,000,000+ nuts/month
• Free-machining brass CZ121 — ISO 9001:2015 material certification with each batch
• Wide size range — M2 to M64 metric; 1/4 inch to 2 inch imperial
• Plating options — bright, nickel, tin, chrome plating available
• DZR and lead-free alloys — for hot water and US NSF 372 compliance
• Competitive bulk pricing — significant cost advantage for US fastener distributors

Frequently Asked Questions — Brass Hex Nuts

Q1: What is the DIN 934 standard for hex nuts?

DIN 934 is the German standard for full-height hexagon nuts with ISO metric coarse threads, superseded by ISO 4032 internationally. It specifies the width across flats (WAF), nut height, chamfer dimensions, and thread tolerance for nuts from M1 to M64. Brass DIN 934 nuts are manufactured from CZ121 (C36000) to the same dimensional standard as steel DIN 934 — only the material specification differs.

Q2: What is the ANSI/ASME B18.2.2 standard for hex nuts?

ANSI/ASME B18.2.2 is the US standard for square and hex nuts in inch sizes. It covers regular hex nuts, heavy hex nuts, hex jam nuts (thin), and hex slotted nuts in UNC and UNF thread series from No. 4 to 4 inches nominal. Brass hex nuts to B18.2.2 are produced in the same dimensions as their steel equivalents, using the same WAF, height, and thread class 2B.

Q3: Why are brass hex nuts used instead of steel in electrical applications?

Brass hex nuts are preferred over steel in electrical enclosures and switchgear for several reasons: brass is non-sparking and non-magnetic, preventing interference with sensitive instruments; brass has good electrical conductivity for ground/earth connections; brass does not rust and maintains appearance in humid environments; and brass nuts on brass or copper studs eliminate galvanic corrosion issues that arise with steel nuts on copper hardware.

Q4: What thread tolerance class do you machine DIN 934 brass hex nuts to?

Brass DIN 934 hex nuts are tapped to tolerance class 6H per ISO 965-1, which is the standard commercial tolerance class for nuts. For precision applications requiring 5H tolerance (tighter), we can produce to that specification. Thread gauging with go/no-go plug gauges to ISO 1502 is performed 100% on production brass hex nuts.

Q5: Can you supply brass hex nuts in metric fine thread?

Yes. Metric fine thread hex nuts per ISO 8673 (e.g. M10×1.25, M12×1.5, M16×1.5, M20×1.5) are standard products. Fine threads are used where greater thread engagement is needed in thin sections, where vibration resistance is required, or for precise adjustment mechanisms. The external dimensions (WAF, height) are the same as ISO 4032 coarse thread nuts of the same nominal size.

Q6: Do you supply brass castle (slotted) hex nuts?

Yes. Castle nuts (slotted hex nuts / castellated nuts) per DIN 935 or ANSI B18.2.2 with castellations (slots) for split pin (cotter pin) retention are a standard product. Used in wheel bearings, steering linkages, and hydraulic cylinder rod ends where the nut must be positively retained against loosening. Available M6 to M36 and 1/4 inch to 1.5 inch.

Q7: What is the difference between a hex nut and a heavy hex nut?

A heavy hex nut has a larger width across flats (WAF) and greater height than a standard hex nut of the same thread size, providing more bearing area and better load distribution. Heavy hex nuts per ASME B18.2.2 and ASTM A563 are used in structural steel connections, flange bolt joints, and high-load bolted connections where standard nut dimensions are insufficient for the applied load.

Q8: Can you supply brass hex nuts with nylon insert (Nyloc) locking?

Yes. Brass nyloc hex nuts per DIN 985 with a nylon insert in the top of the nut provide vibration-resistant locking without separate lock washers. The nylon insert grips the bolt thread and provides a prevailing torque that resists self-loosening. Brass nyloc nuts are standard in M4 to M20. Note that nyloc nuts are not suitable for temperatures above 120°C — for higher temperature locking, all-metal lock nuts are required.

Q9: What plating options are available on brass hex nuts?

Available plating options: bright (unplated, natural brass), electrolytic nickel (5 to 10 µm), tin plating (5 to 15 µm), chrome plating (decorative), and antique brass lacquer for decorative hardware. Plating is applied after full thread gauging so thread dimensions remain within tolerance after plating. Plating thickness is confirmed by XRF measurement on production samples.

Q10: Are your brass hex nuts RoHS compliant?

Standard brass hex nuts in CZ121 (C36000) with 3% lead are exempt from RoHS restrictions under Annex III, exemption 6(a), for copper alloys containing up to 4% lead. Lead-free brass hex nuts in C69300 or CW510L are available for applications where this exemption does not apply. RoHS declarations and REACH substance compliance documents are provided with all shipments.

Q11: What is the minimum order for brass hex nuts?

For standard metric sizes M4 to M16 and imperial sizes 1/4 to 5/8 inch in CZ121 bright finish: minimum 500 pieces per size. For non-standard thread forms, metric fine, or special alloys: minimum 1,000 pieces. For very small sizes (M2, M2.5, M3) or very large sizes (M30 and above): minimum 200 and 500 pieces respectively. Sample evaluation packs of 25 to 50 pieces in 5 to 7 working days are available.

Q12: What is the lead time for bulk brass hex nut orders?

For standard stock sizes in CZ121 bright finish: ex-stock or 5 to 7 working days for up to 100,000 pieces per size. For plated nuts (nickel or tin): add 5 to 7 working days for plating. For non-standard sizes, metric fine, or special alloys: 2 to 4 weeks. Air freight to USA: 3 to 5 business days. Sea freight in container (20 or 40 foot): 18 to 25 days to US West Coast.