CZ121 Brass is a high-tensile, free-cutting leaded brass alloy widely used for precision CNC machining, screw machine parts, and complex turned components. At Cable Glands India, we specialize in manufacturing CZ121 Brass Machined Parts of the highest quality — precision-turned, milled, ground, and drilled to exact customer specifications. We export CZ121 brass components to the USA, UK, Europe, Australia, and Canada, serving industries from automotive and electrical to plumbing and defense.

What is CZ121 Brass Alloy?

CZ121 is a British Standard (BS 2874) free-machining leaded brass containing approximately 57–59% Copper, 39–41% Zinc, and 2.5–3.5% Lead. The lead content acts as an internal lubricant during machining, dramatically improving chip-breaking, extending tool life, and enabling very high-speed CNC turning. CZ121 is the UK/European designation equivalent to the American C36000 (Brass 360) alloy.

CZ121 Brass Machined Parts We Manufacture

1. CZ121 Brass Cable Gland Bodies

Precision-turned CZ121 brass cable gland bodies (PG thread, Metric, NPT, BSP) for industrial electrical enclosures. Available with armour clamping, explosion-proof ratings, and IP66/IP68 sealing.

2. CZ121 Brass Fittings and Connectors

Threaded compression fittings, push-in connectors, bulkhead fittings, and pneumatic couplings machined from CZ121 round bar and hexagonal brass stock.

3. CZ121 Brass Valve Components

Valve bodies, stems, seats, and inserts for ball valves, gate valves, and needle valves — manufactured to DIN, BS, and ANSI standards.

4. CZ121 Brass Lock Nuts and Hex Nuts

Precision-machined metric and imperial lock nuts, hex nuts, and cap nuts from CZ121 brass hexagonal bar for electrical, plumbing, and mechanical applications.

5. CZ121 Brass Insert Components (Moulding Inserts)

Threaded brass inserts for plastic injection moulding, used in electronics, automotive, and consumer goods industries. Manufactured to DIN 16900 / ISO standards.

6. CZ121 Brass Screw Machine Parts

High-volume production of small precision screw machine parts: pins, studs, spacers, bushings, and custom turned components with tight tolerances (±0.005mm).

7. CZ121 Brass Electrical Components

Switched contacts, terminal blocks, earth studs, bonding connectors, and busbar components for LV/MV switchgear manufactured from CZ121 brass.

Related Parts and Alloys

• CZ120 Brass (Lower lead content for better plating)
• CZ131 Brass (High tensile, naval brass)
• CZ112 Brass (Dezincification resistant for plumbing)
• CW614N Brass (European equivalent – EN 12164)
• CW617N Brass (European DZR Brass)
• C36000 Brass (American equivalent)
• C37700 Forging Brass

Material Grades & International Equivalents

Standard	Designation	Cu%	Zn%	Pb%	Notes
BS (UK)	CZ121	57–59	Bal.	2.5–3.5	Free-cutting leaded brass
EN / DIN (Europe)	CW614N	57–59	Bal.	2.5–3.5	European free-machining brass
ASTM (USA)	C36000	60–63	Bal.	2.5–3.7	American free-cutting brass
JIS (Japan)	C3601	59–63	Bal.	1.8–3.7	Japanese free-cutting brass
IS (India)	HBrass 60/40 Pb	58–62	Bal.	1.5–2.5	Indian free-cutting brass
GOST (Russia)	ЛС59-1	57–60	Bal.	0.8–1.9	Russian free-cutting brass

Machinability and Mechanical Properties of CZ121

Property	Value
Machinability Rating	100% (Reference standard for free-cutting brass)
Tensile Strength	360–440 MPa
Yield Strength (0.2%)	120–200 MPa
Hardness	80–120 HV
Elongation	20–30%
Density	8.5 g/cm³
Electrical Conductivity	26% IACS
Thermal Conductivity	109 W/m·K

Applications of CZ121 Brass Machined Parts

• Cable Glands and Electrical Connectors
• Plumbing and Gas Fittings
• Automotive Fuel and Brake Components
• Pneumatic and Hydraulic Systems
• Electronic and Telecom Enclosures
• Defense and Aerospace Ground Support
• Marine Hardware and Deck Fittings
• Industrial Valves and Flow Control

Why Choose Cable Glands India for CZ121 Brass Parts?

• Jamnagar Manufacturing Hub: Based in Jamnagar — India’s capital for brass machining — giving us direct access to prime quality CZ121/CW614N brass rod and hexagonal bar.
• CNC Precision Machining: Fleet of CNC Swiss-type lathes, turning centres, and machining centres capable of ±0.005mm tolerances.
• Surface Finishing: Nickel plating, chrome plating, tin plating, powder coating, and passivation available in-house.
• Export Capability: DGFT registered exporter with experience in US Customs (HTS codes), EU CE compliance, and UK UKCA documentation.
• Competitive Pricing: Save 25–45% compared to UK, US, or German suppliers on identical CZ121 machined parts.
• ISO 9001:2015 Certified Quality System.

Frequently Asked Questions (FAQ) – CZ121 Brass

Q1: What is the American equivalent of CZ121 brass?

A: The American (ASTM) equivalent of CZ121 brass is C36000 (Brass 360 / Free-Cutting Brass). Both are leaded brasses with similar copper-zinc-lead compositions, although C36000 has slightly higher copper content (60–63% vs 57–59% for CZ121).

Q2: What is the European equivalent of CZ121?

A: The European equivalent is CW614N per EN 12164 / EN 12167. It is also referred to as EN CW614N or DIN 2.0401 in German standards.

Q3: Is CZ121 brass RoHS compliant?

A: Standard CZ121 contains 2.5–3.5% lead and is not fully RoHS compliant for applications where lead-free is mandatory (e.g., drinking water contact). For RoHS-compliant applications, consider CZ132 (low-lead) or CW625N (lead-free DZR brass). We supply lead-free alternatives on request.

Q4: What tolerances can you achieve in CZ121 brass machining?

A: Our CNC machines achieve standard tolerances of ±0.02mm and precision tolerances down to ±0.005mm on diameters. Thread tolerances per ISO 965 (6H/6g) and inch threads per ASME B1.1.

Q5: Can CZ121 be plated or anodized?

A: Yes. CZ121 accepts electroplating very well. Common finishes include nickel plating, chrome plating, tin plating, and silver plating. Anodizing is not suitable for brass — only for aluminium.

Q6: What is the machinability rating of CZ121 brass?

A: CZ121 has a machinability rating of 100% — it is the reference standard against which all other metals are measured. This makes it the most cost-effective option for high-volume precision machining.

Q7: Do you supply CZ121 brass in bar, rod, or sheet form?

A: We specialize in machined parts rather than raw material supply. However, we can source CZ121 brass round bars, hexagonal bars, and flat bars from our supplier network and machine them to your specifications.

Q8: What thread standards do you machine in CZ121 brass?

A: We machine all thread standards: Metric (M3–M100), BSP (G-thread), NPT, UNC, UNF, PG (cable gland threads), BSPP, BSPT, and custom thread forms per drawing.

Q9: What is the difference between CZ121 and CZ112?

A: CZ121 is a free-cutting leaded brass optimized for machining speed. CZ112 (Dezincification Resistant / DZR brass) is designed for plumbing applications in potable water systems where resistance to dezincification corrosion is critical. CZ112 contains inhibitors (arsenic) to prevent zinc leaching.

Q10: Is CZ121 suitable for high-pressure applications?

A: Yes. CZ121 has excellent tensile strength (360–440 MPa) and is widely used for hydraulic fittings, valve bodies, and pneumatic components rated up to 600 psi (41 bar) depending on wall thickness and design.

Q11: Can you supply CZ121 machined parts to the US market?

A: Yes. We regularly export CZ121 brass (equivalent to C36000) machined parts to the USA. We provide all necessary documentation: Commercial Invoice, Packing List, Certificate of Origin, Material Test Report, and country-of-origin declarations for US Customs.

Q12: What is the lead time for custom CZ121 brass parts?

A: Standard stock items: 1–2 weeks. Custom machined parts: 3–5 weeks depending on complexity and quantity. Rush orders can be accommodated at a surcharge.

Q13: Do you provide material test reports for CZ121 brass?

A: Yes. We provide Mill Test Reports (MTR/MTC) confirming chemical composition and mechanical properties per BS 2874 or EN 12164. Chemical analysis by OES (Optical Emission Spectrometry) traceable to NIST standards.

Contact Cable Glands India for a competitive quote on CZ121 Brass Machined Parts. Email: sales@cableglandsindia.com. We respond within 24 business hours.

---