CZ121 Brass Turned Parts

CZ121 Brass Turned Parts & Machined Components

CZ121 brass turned parts — also referenced as CW614N turned components, CuZn39Pb3 machined parts, IS 319 brass turned parts, C36000 brass precision components, or free-cutting brass turned parts (BS 2874 grade) — are high-precision machined components produced from CZ121 (BS 2874) free-cutting brass rod and bar. CZ121 is the traditional British Standard designation for the world’s most widely used free-cutting brass alloy: copper approximately 57–59%, zinc approximately 38–40%, and lead 2.5–3.5% for optimum machinability. Electrical Accessories India manufactures CZ121 brass turned parts on CNC lathes, multi-spindle automatic screw machines, and Swiss-type turning centres for UK, European, and global OEM customers requiring parts specified to BS or EN standards.

Product Overview

CZ121 Brass: Grade Identity and Cross-References

CZ121 is the BS 2874 grade designation for free-cutting brass rod. The full cross-reference list: CZ121 (BS 2874, UK) = CW614N (EN 12164, Europe) = CuZn39Pb3 (compositional name) = C36000 (ASTM B16, USA) = IS 319 Type 1 (BIS, India) = CuZn39Pb3 (DIN 17660, Germany) = ISO 426/1 CuZn39Pb3. This grade accounts for over 60% of all free-cutting brass bar produced globally. The lead content (2.5–3.5%) forms fine particles that act as internal chip-breakers, enabling cutting speeds up to 350 m/min, excellent surface finish, and long tool life in high-volume automatic production.

Why CZ121 is Specified by UK and Export OEMs

UK electrical equipment manufacturers — cable gland manufacturers, connector OEMs, wiring accessories producers — historically specified CZ121 to BS 2874 for all brass turned parts. European directives and harmonised standards have progressively replaced BS with EN designations, but CZ121 remains widely understood and specified in UK and Commonwealth markets. Electrical Accessories India accepts CZ121 specifications and supplies conforming CW614N material with dual BS/EN certification on the MTR. This ensures full compliance whether the OEM drawing specifies CZ121 or CW614N.

Machining Properties of CZ121

CZ121 / CW614N has a machinability index of 100 — the reference standard against which all other metals are compared. Its free-machining characteristics allow high cutting speeds (200–350 m/min), short cycle times, consistent chip formation, excellent surface finish (Ra 0.8–1.6 µm achievable as-turned without secondary polishing), long tool life (carbide inserts lasting millions of cuts), and low cutting forces that reduce machine wear. These properties translate directly into cost efficiency for high-volume CZ121 screw machine parts and turned components, making CZ121 the economically optimal choice when its corrosion resistance and strength are adequate for the application.

CZ121 Component Types and Size Range

Electrical Accessories India produces CZ121 turned components ranging from miniature M3 terminal pins (2 mm diameter × 8 mm length) to large cable gland bodies (50 mm diameter × 80 mm length). Component complexity spans simple reduced-OD pins with a single thread to multi-stepped connector bodies with 4–6 turning diameters, internal bore, external and internal threads, cross-holes, and knurl. Standard tolerances ±0.01 mm on precision features, 6g/6H threads. Custom tolerances to ±0.005 mm on ground surfaces. Length-to-diameter ratios up to 20:1 achievable on Swiss-type machines.

Applications of CZ121 Turned Parts in Electrical Industries

CZ121 turned parts are the backbone of the electrical accessory manufacturing industry. Cable gland bodies (metric and NPT, armoured and unarmoured types) are machined from CZ121 hex bar. Conduit locknuts and fittings are turned from CZ121 round bar. Terminal studs and pins in switchgear and distribution boards use CZ121. Electrical connector bodies for industrial multipin connectors use CZ121 as the shell material. Panel board fittings, earth terminal studs, and grounding hardware are frequently CZ121 turned parts with nickel or tin plating for enhanced conductivity and tarnish resistance.

Certification and Dual-Standard Compliance

Electrical Accessories India sources CZ121 / CW614N rod from ISO-accredited primary brass mills in India (Jamnagar-based rod producers) and European suppliers. Each incoming batch carries a 3.1 or 2.2 Mill Test Certificate showing full chemical composition and mechanical properties per EN 10204. Our quality documentation team can issue dual-standard certificates referencing both BS 2874 CZ121 and EN 12164 CW614N designations. RoHS declarations (noting the Annex II 6(c) exemption for lead in brass alloys for plumbing and electrical use) and REACH SVHC declarations are standard documentation with every shipment.

Key Features

• CZ121 (BS 2874) = CW614N (EN 12164) = CuZn39Pb3 = IS 319 Type 1 = C36000 — all designations accepted
• Machinability index 100 — optimal for high-volume screw machine and CNC turning
• Dual BS/EN certification on material test reports available
• Component sizes: 2–50 mm OD; M3–M64 threads; lengths to 200 mm
• Tolerances: ±0.01 mm precision; 6g/6H threads; Ra 0.8–3.2 µm surface finish
• Plating: bright nickel, electroless nickel, tin, chrome, passivation
• ISO 9001:2015 certified; EN 10204 3.1 MTRs on request
• Volumes from 1,000 to 10 million+ pieces per year
• UK, European, and global export experience with full documentation
• RoHS Annex II 6(c) and REACH SVHC declarations with each shipment

Material Grades and International Equivalents

Technical Specifications

Product Types and Variants

CZ121 turned parts from Electrical Accessories India include: Cable gland bodies (M16–M63, NPT 1/2″–2″) machined from CZ121 hex bar; Conduit locknuts and entry adaptors in metric and imperial sizes; Electrical terminal pins and contact pins for switchgear (M3–M12); Connector bodies for industrial multipin and circular connectors; Panel board fittings — brass studs, standoffs, and earth tags; Brass inserts for injection moulded housings (knurled OD, various drive types); Custom CZ121 turned components to UK, EU, or Indian standard drawings for any OEM application.

Applications in Industry

CZ121 brass turned parts are central to UK and global electrical manufacturing. Cable gland manufacturers in the UK specify CZ121 for compliance with BS EN 62444 and BS EN 50262. Wiring accessories OEMs use CZ121 terminal pins and studs in MK, Crabtree, and equivalent switchgear. Panel board and distribution board builders use CZ121 busbar connectors and earth fittings. Industrial automation and control panel manufacturers use CZ121 turned inserts in DIN rail components. Plumbing OEMs in the UK use CZ121 for compression fitting bodies and valve stems per BS 864. Instrumentation suppliers use CZ121 for compression fitting bodies and thermowell adapters.

Manufacturing Process

1. Material Receipt: CZ121 / CW614N bar received with EN 10204 3.1 MTR; OD, straightness, and surface quality verified; heat number logged.
2. Setup: Machine tooling, collet, and barfeed configured; CNC program or cam profiles set to drawing.
3. First Article: Trial component produced; all drawing dimensions checked; FAI report generated.
4. Production: Continuous auto-feed production with in-process gauging at defined intervals.
5. Secondary Ops: Tapping, cross-drilling, milling, knurling as required.
6. Deburring: Vibratory or manual deburring; 100% visual for burrs on threaded parts.
7. Plating/Finishing: Nickel, tin, chrome, or passivation per specification.
8. Final Inspection: AQL sampling; CMM check on precision features; thread gauging.
9. Packing: Moisture-barrier export packing; MTR, CoC, and documentation included.

Quality Standards and Certifications

CZ121 brass turned parts conform to: ISO 9001:2015 QMS; BS 2874 (CZ121 rod); EN 12164 CW614N (free-cutting brass rod, European equivalent); ASTM B16 (C36000 free-cutting brass); IS 319 (Indian standard); ISO 965 (thread tolerances); ISO 286 (dimensional tolerances); RoHS Directive 2011/65/EU Annex II 6(c) exemption (lead in brass fittings); REACH Regulation SVHC compliance. Dual BS/EN MTRs available on request.

Why Choose Electrical Accessories India

Electrical Accessories India has supplied CZ121 / CW614N turned parts to UK and European OEMs for over two decades. We understand the requirements of BS and EN standards, issue dual-standard documentation, and maintain the export compliance processes required for UK and EU import. Our Jamnagar facility gives access to the world’s most competitive brass supply chain, allowing CZ121 turned parts to be supplied at prices that domestic UK or European machining cannot match while maintaining the same quality standards. Single-source procurement for complete brass component families — turned, forged, cast — reduces your supplier management overhead.

Frequently Asked Questions (FAQ)

Is CZ121 the same as CW614N?

Yes. CZ121 (BS 2874) and CW614N (EN 12164) are different standard designations for the same alloy: CuZn39Pb3 free-cutting brass. They are chemically and mechanically equivalent. Electrical Accessories India stocks this alloy and can issue certificates referencing either or both designations depending on the customer’s drawing requirements.

Does CZ121 comply with RoHS?

CZ121 contains lead (2.5–3.5%) which is covered by RoHS Directive 2011/65/EU Annex II Exemption 6(c): “Lead as an alloying element in brass used for fittings, components and parts of plumbing and electrical fitting installations.” This exemption allows leaded brass in these specific applications. For applications outside this exemption, Electrical Accessories India offers CW602N (DZR) or bismuth-brass alternatives.

Can you supply CZ121 parts with a BS 2874 certificate?

Yes. We source CZ121/CW614N rod from mills that issue BS 2874 or dual BS/EN material test reports. On request, we can provide a EN 10204 3.1 certificate with both BS 2874 and EN 12164 references. This is standard practice for UK export customers.

What is the machinability advantage of CZ121 over other metals?

CZ121 has a machinability index of 100 — the highest of any commonly used metal. By comparison, mild steel is 50–60, aluminium is 60–70, and stainless steel is 40–50. This means CZ121 can be machined approximately twice as fast as steel at the same tool life, directly reducing cycle time and per-part cost in high-volume production.

What thread forms do you produce in CZ121?

Metric (ISO, M series), BSP/BSPT (British Standard Pipe), NPT/NPTF (American pipe thread), UN (Unified, UNC/UNF), and BA (British Association) threads all machined in CZ121. Thread gauging (6g Go/No-Go, or BSP/NPT gauges) performed 100% on every threaded part.

What is your typical delivery for CZ121 turned parts?

Standard production: 3–5 weeks from approved drawing. Repeat orders from stock: 1–2 weeks. Prototype samples: 1–2 weeks. Air freight available for urgent orders to UK/Europe with standard export documentation.

Do you have UK or EU quality approvals?

Electrical Accessories India is ISO 9001:2015 certified (3rd-party audit by accredited certification body). Our products are CE marked where applicable (e.g., cable glands to EN 62444). We have supplied to UK-registered companies subject to BS EN and UKCA marking requirements.

Can you supply CZ121 parts with tin plating to UK electrical standards?

Yes. Tin-plated CZ121 brass parts are supplied with tin layer per BS EN 60999-1 (connection of aluminium conductors) or to customer specification. Tin plating (5–15 µm electrolytic) improves surface conductivity and reduces contact resistance — standard for electrical terminal applications.

Equivalent Terms – Multilingual Reference

Related Products and Linked Terms

• Brass Parts – Brass CNC Machined Parts
• Brass Turned Parts – Brass Turned Components
• CW614N Brass Components and Parts
• CuZn39Pb3 Brass Parts and Components
• Brass Screw Machine Parts
• Brass Forging Parts – Brass Forged Components

Request a Quote

Supply your drawing, sample, or specification and receive a detailed technical and commercial proposal within 24 hours. Electrical Accessories India engineers are available to advise on CZ121/CW614N alloy suitability, machining process, tolerances, and surface finish for your specific application. We export to the UK, Europe, and 30+ countries with full shipping documentation.

Contact us: Send your RFQ with quantity, grade (CZ121 or CW614N), drawing (PDF/DXF/STEP), and delivery requirement. We respond within 24 business hours.

Indicative Pricing

Brass Items: US$ 11.50 per kilogram, CIF US Port

Prices are indicative and subject to change based on quantity, specification, alloy grade, and market conditions. Contact us with your RFQ for a firm quotation.