How brass parts are made in Jamnagar and elsewhere
Brass parts start as extruded rod, hollow bar or hexagon bar, often extruded from remelted brass scrap. Turned parts are machined on cam-operated automats, CNC lathes and sliding-head machines; small parts come off in thousands per shift. Hot-forged parts, such as valve and fitting bodies, are stamped from heated slugs in closed dies and then machined. Parts are then tumbled or deburred, cleaned, and often nickel or chrome plated, or tinned for electrical use.
Lead is added to brass to make it cut cleanly, which is why free-machining grades such as CW614N carry a few per cent of it. That is also why the alloy matters so much to export buyers: a part that is fine in a European connector may be illegal in an American drinking-water fitting. When scrap is the feedstock, the actual chemistry can drift from the grade named on the invoice.
The Gujarat Industries Commissionerate lists Jamnagar's "Brass Parts" cluster. IANS reported on 18 February 2026 that the city has nearly 8,000 units making brass components and supplies sectors from Indian Railways to defence. India's export headings for brass are spread across many product lines; for scale, TradeStat shows HS 7415 copper-alloy fasteners at US$64.4 million and HS 741220 copper-alloy pipe fittings at US$73.6 million in FY2025-26 (provisional), which covers only part of the trade.
What we check on brass parts
| Check | How it is checked | What fails |
|---|---|---|
| Alloy and lead | Handheld XRF analysis on parts we select from each lot, run by the factory or a PMI specialist in our presence; readings compared with the grade and the lead limit you set | Lead above your limit; leaded brass where lead-free was ordered; grade mixed between lots |
| Thread form and fit | Thread type confirmed (BSP parallel to ISO 228-1, BSP taper to ISO 7-1, NPT, or metric) and gauged with the matching go and no-go or step gauges; gauge calibration checked | NPT supplied for BSP or the reverse; taper gauge out of the step band |
| Turned dimensions | Diameters, lengths, chamfers, hexagon across flats and knurl measured on sampled parts against the drawing and its ISO 2768 class | Critical diameters out of tolerance; eccentric bores |
| Burrs and swarf | Bores, cross-drillings and threads inspected under good light and magnification; parts shaken over white paper | Loose chips in bores; burrs at cross-holes that can break off in service |
| Plating | Thickness by the factory's XRF or coating gauge; adhesion by the agreed bend or file test, witnessed; appearance in daylight | Thin or blistered plating; peeling at edges |
| Forging quality | Forged bodies checked for laps, cracks and porosity on machined faces; the factory's air or water leak test witnessed where specified | Porosity that leaks under pressure |
| Cleanliness and tarnish | Oil, coolant residue and staining checked; packing for tarnish protection | Stained or oily parts where clean parts were ordered |
XRF is a screen, not a certificate: it reliably separates leaded from low-lead brass and catches grade mix-ups, but disputes over lead near a limit, dezincification resistance (ISO 6509-1) or residual stress go to an accredited lab through lab testing coordination.
Lead limits: RoHS, US drinking water and Prop 65
| Market and rule | What it says about lead in brass | What to order |
|---|---|---|
| EU RoHS (electrical and electronic equipment) | Exemption 6(c) allows copper alloy containing up to 4% lead by weight. Delegated Directive (EU) 2025/2364 set its expiry at 30 June 2027 for all categories, applying from 1 July 2026 | For parts going into electrical equipment, confirm the exemption still covers your shipment dates, or order a low-lead grade. See RoHS and WEEE |
| US Safe Drinking Water Act | "Lead free" pipes, fittings and fixtures: a weighted average of 0.25% lead across wetted surfaces; certification required for manufacturers and importers since 1 September 2023 (EPA) | Lead-free alloy for every wetted part, with third-party certification such as NSF/ANSI 372 |
| California Prop 65 | Lead is a listed chemical; consumer products that expose users need a clear warning unless exposure is below the safe-harbor level | Decide alloy or warning before production. See Prop 65 |
| UK potable water | In England and Wales, fittings must meet the Water Supply (Water Fittings) Regulations 1999; WRAS approval is the usual evidence | DZR or approved alloy and the approval certificate for the exact part |
Copper alloys are not among the goods covered by the EU Carbon Border Adjustment Mechanism, unlike steel fasteners and fittings.
Common defects in brass parts
| Defect | Why it matters | Class |
|---|---|---|
| Leaded brass in a part ordered lead-free for drinking water | Illegal to sell for that use; recall risk | Critical |
| Porosity leaking in a gas or water fitting | Leak in service; safety risk for gas | Critical |
| Wrong thread form (NPT vs BSP) | Joint seems to tighten but leaks or strips | Major |
| Swarf or burrs inside bores | Blocks valves and jets; loose metal in electrical parts | Major |
| Cracks at forged or crimped sections | Season cracking can follow in service | Major |
| Plating peeling or thin | Corrosion and appearance complaints | Major |
| Tarnish, tool marks on visible faces | Appearance | Minor |
Packing, transit and your purchase order
Brass tarnishes in humid air and small parts are easily mixed. Ask for parts in sealed polythene bags with a desiccant or anti-tarnish paper, labelled by part number, alloy and lot, inside strong cartons on pallets. Plated or polished parts need separators so faces do not rub. The inspector checks bag labels and counts, carton weights, and that lots are not mixed between cartons.
Put these in your purchase order:
- Drawing and revision, with tolerances and the ISO 2768 class.
- Alloy designation and maximum lead content, and which market rule applies.
- Thread form and class for every thread (BSP parallel or taper, NPT, metric).
- Plating type, thickness and adhesion test; cleanliness and burr requirements.
- Leak test pressure and medium for fittings and valve bodies.
- Certificates: EN 10204 3.1 for the rod or forging stock, and third-party approvals where needed.
- Bagging, labelling and anti-tarnish packing.
Book an inspection in Jamnagar or anywhere in India.
Sources
- Industries Commissionerate, Government of Gujarat: cluster development (Jamnagar, Brass Parts)
- IANS: Jamnagar emerges as global brass manufacturing hub with MSME support (18 Feb 2026)
- Commission Delegated Directive (EU) 2025/2364 on lead as an alloying element in steel, aluminium and copper (EUR-Lex)
- US EPA: Use of lead free pipes, fittings, fixtures, solder and flux for drinking water
- ISO 6509-1:2014, Corrosion of metals and alloys: determination of dezincification resistance (Standard Norge listing)
- Department of Commerce, TradeStat: commodity-wise exports (HS 7415, 741220; FY2025-26 provisional)