🟡 BRASS
Brass Machining and Sourcing in Terre Haute, IN: C360, C260, and Naval Brass
Brass occupies a consistent niche in Terre Haute's industrial manufacturing output — free-machining C360 turns faster and cleaner than almost any other metal, making it the preferred material for high-volume valve bodies, fittings, and precision components wherever cost-effective machining and moderate corrosion resistance matter. C260 cartridge brass handles the formed and deep-drawn hardware that goes into industrial packaging and equipment assemblies. Naval brass bridges the gap for components needing both formability and dezincification resistance in aqueous service. ManufacturingBase maps the regional brass machining and fabrication capacity so buyers in western Indiana can source efficiently.
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Grade Comparison: C360, C260, and Naval Brass C464
C360 free-machining brass (61.5% Cu, 35.5% Zn, 3% Pb) holds the benchmark machinability rating of 100% — every other metal is rated against it. The lead addition creates discrete inclusions that act as chip breakers, allowing cutting speeds of 700–1,000 SFM in turning with HSS tooling and over 1,500 SFM with carbide. Surface finish is excellent — Ra 16 is achievable as a standard turned finish, Ra 8 or better with a finishing pass. Yield strength is modest at 18–25 ksi depending on temper, but corrosion resistance in fresh water, mild chemical environments, and atmospheric exposure is good. C360 is specified for valve bodies, fittings, coupling nuts, hydraulic manifold components, and precision turned parts throughout Terre Haute's industrial equipment and chemical plant supply chains. If a buyer needs a machined brass part and doesn't have a specific corrosion requirement that mandates another grade, C360 is almost always the correct starting specification.
C260 cartridge brass (70% Cu, 30% Zn) is optimized for cold working, not machining. Its high copper content and uniform structure allow severe cold deformation — deep drawing, spinning, blanking, and forming without intermediate annealing at reductions that would crack higher-zinc alloys. Machinability drops to 30% compared to C360's 100%, meaning machining costs are approximately 3x higher for equivalent features. C260 is specified for formed and drawn components — industrial packaging hardware, eyelet and spring components, and sheet metal formed parts in assembly machinery. Terre Haute fabricators working on packaging equipment and assembly tooling regularly work with C260 sheet for formed components.
Naval brass C464 (60% Cu, 39.25% Zn, 0.75% Sn) adds tin to the basic 60/40 brass to improve dezincification resistance — the electrochemical selective corrosion of zinc from the brass matrix that leaves behind a porous, weak copper sponge. Standard brasses (C360, C260) are susceptible to dezincification in slow-moving or stagnant potable water systems, certain industrial cooling water systems, and warm mildly acidic aqueous environments. C464 naval brass is the solution: tin inhibits the dezincification mechanism. It machines at 30–40% machinability rating — more difficult than C360, less difficult than copper or stainless. Applications include valve bodies in water service, heat exchanger tube sheets, and marine fittings in industrial cooling systems.
High-Volume CNC Turning of C360 Brass in Terre Haute Machine Shops
C360 brass on a CNC lathe is the closest thing manufacturing has to a fast food order — it's quick, predictable, and the economics work. Shops in the Terre Haute area running CNC Swiss-type lathes or multi-spindle screw machines on C360 bar stock produce valve components, fitting bodies, and precision turned parts at rates that make the per-piece cost of machined brass parts surprisingly low compared to other metals. A simple threaded fitting body that takes 4 minutes in 316L stainless takes under 60 seconds in C360 with equivalent tolerances.
The machining parameters reflect the material's properties: turning at 600–1,000 SFM with HSS or carbide tooling, chip loads of 0.004"–0.012" per rev depending on depth of cut, and generally no coolant required for lighter cuts (air blast is sufficient for chip clearing). For precision bore work, a light flood of water-soluble coolant improves size consistency as the part heats over a production run. Tolerances of ±0.001" on turned diameters are standard production quality on C360; ±0.0005" is achievable with tooling management and process monitoring on Swiss-type equipment.
Thread production in C360 — cut taps for NPT pipe threads and unified threads, single-point threading for fine-pitch Acme or machine threads — produces clean, burr-free threads that gauge correctly without reworking. Cross-drilling and milling of valve body features in secondary operations (on mill-turn centers or in VMC fixtures) completes the part to final configuration. C360 chips cleanly in these secondary operations too, making it practical to combine turning and milling on a single part setup.
Joining, Plating, and Surface Treatment of Brass Components
Brass joins readily by silver brazing (BAg-7 and BAg-28 are common fillers for brass-to-brass and brass-to-copper joints), soft soldering (electrical and plumbing applications), and threading. Fusion welding is generally not specified for brass because zinc vaporizes at welding temperatures, creating toxic fumes, porosity in the weld, and degraded corrosion resistance in the HAZ. Torch brazing with flux and BAg-28 (silver-copper-zinc-tin) at 1295–1550°F is the standard for C360 and C260 assemblies requiring hermetic joints. Post-braze flux removal in hot water with wire brushing is required to prevent corrosion at the joint interface.
Surface treatments for brass components in Terre Haute industrial applications cover a range: clear lacquer for atmospheric corrosion protection while maintaining the decorative appearance, electroplated nickel for improved corrosion and wear resistance on components in mild chemical environments, chrome plate for wear surfaces, and tin plate for electrical contact applications. For plumbing and potable water fittings, NSF 61 listing (which requires lead-free or low-lead brass) is a procurement requirement — C360's 3% lead content disqualifies it for new potable water applications in states that have adopted the 2011 Safe Drinking Water Act amendments. C69300 eco-brass (silicon-containing, lead-free, 0.25% Pb max) is the replacement grade for those applications, though at higher cost and reduced machinability.
Electropolishing of brass components for appearance-critical applications (instrument panels, decorative hardware, consumer-facing equipment components) produces a bright, reflective finish without mechanical polishing labor. Regional finishing subcontractors serving the Terre Haute area offer electropolishing as part of a brass component finishing package.
Frequently Asked Questions
C360 achieves its 100% machinability rating through a combination of its 60-40 copper-zinc base alloy composition and a 3% lead addition. The lead exists as discrete globular inclusions distributed through the brass matrix — these inclusions have virtually no strength and act as built-in chip breakers that cause the material to fracture into short chips at the cutting zone rather than forming long stringy chips like pure copper or many other metals. The result is clean chip formation at high cutting speeds, low cutting forces (because the chips break quickly rather than requiring large chip-curl energy), and excellent surface finish because the chip-breaking mechanism produces a fresh, un-smeared cut surface. The 60-40 alpha-beta two-phase brass structure also contributes — the harder beta phase provides additional chip-breaking tendency. Cutting speeds of 700-1,000 SFM in turning are routinely achieved with HSS tooling, going above 1,500 SFM with coated carbide. Compare this to 316L stainless at 60-100 SFM with carbide, or even 6061 aluminum at 400-800 SFM, and the productivity advantage of C360 for high-volume turned part production becomes clear.
Naval brass C464 is required when the brass component will be in long-term contact with water — particularly stagnant or slow-moving water, potable water systems, cooling water systems, and warm mildly acidic aqueous environments — where dezincification is a service failure risk. Dezincification is a selective corrosion process where zinc is leached from the brass matrix, leaving behind a weak, porous copper sponge that retains the original part dimensions but has essentially no mechanical strength. A valve body that has dezincified looks intact but will fracture under normal operating loads. Standard C360 and C260 brasses with 35-40% zinc are susceptible to this mechanism in the right conditions. C464 Naval brass with its 0.75% tin addition inhibits dezincification by stabilizing the brass matrix against selective zinc dissolution. Machinability drops to 30-40% versus C360's 100%, so the decision to specify Naval brass should be based on a real dezincification risk assessment — specifying it unnecessarily just adds machining cost without benefit. Key indicators that C464 is warranted: water service application, chlorinated cooling water or potable water contact, temperatures above 60°F (15°C), and water chemistry with low chloride-to-bicarbonate ratio (which promotes dezincification).
The 2014 changes to the Safe Drinking Water Act (effective January 2014) reduced the allowable weighted average lead content for plumbing fittings and fixtures in contact with potable water to 0.25% — effectively eliminating C360 (3% Pb) from new potable water applications. The lead-free brass alternatives used in the fittings and valve industry include: C69300 (eco-brass, silicon bismuth brass, typically 0.25% Pb max, 0.5-0.9% Si), which achieves machinability of 70-80% — significantly better than other lead-free options while meeting lead-free requirements; C89550 and C87600 silicon bronze/brass compositions; and bismuth-selenium brasses that use bismuth and selenium to replace lead's chip-breaking function. Of these, C69300 eco-brass has gained the most adoption in the fitting and valve industry because its machinability is close enough to C360 that existing tooling and programs can be adapted with modest adjustment. Cost is 20-35% higher than C360, and availability is narrower — fewer distributors stock it in the full range of rod sizes. Shops in the Terre Haute area that supply fittings to the plumbing trade have already transitioned to eco-brass for potable water work.
C260 cartridge brass (70% Cu, 30% Zn) is one of the most formable commercial metals available. Its alpha-phase microstructure (single-phase at 70/30 Cu/Zn ratio) is highly ductile and work-hardens moderately during cold working, allowing severe deformation without fracture. Drawing ratios (blank diameter to punch diameter) of 2.0 to 2.2 are achievable in a single draw pass, versus 1.8-1.9 for mild carbon steel. Multiple-pass deep drawing with intermediate annealing allows total area reductions of 60-70% or more from the starting blank thickness. These properties make C260 the standard for cartridge cases (hence the name), deep-drawn housings, and formed hardware components in packaging and assembly machinery. Terre Haute fabricators working on packaging equipment often spec C260 for parts with complex formed geometries that would require expensive casting or machining in other materials. Annealing between drawing passes is done at 600-700°F (315-370°C) for stress relief, or 700-1,100°F (370-595°C) for full recrystallization anneal to restore maximum ductility. Final temper after forming affects spring-back behavior and should be specified based on the application's dimensional requirements.
Brass is one of the fastest-turn machined materials in the Terre Haute market because C360 is broadly stocked, machines rapidly, and is a staple production material for most CNC machine shops. Raw material (C360 rod, typically in 0.250" through 3.000" diameter) is available from Indianapolis and regional service centers in 1-3 business days. Simple turned parts (fittings, coupling bodies, bushing stock) from CNC lathe shops: 5-10 business days for 25-100 piece quantities, 2-3 weeks for 250-1,000 pieces. Complex machined parts with multiple setups, cross-holes, and threading: 2-3 weeks for prototypes and short runs. Swiss-type CNC shops running high-volume production on C360 bar fed stock can quote 1-2 week turns on production quantities of 500-5,000 pieces for parts under 1" diameter. C260 formed parts have longer lead times because press tooling setup and progressive die work are involved — prototype stamping tools 6-10 weeks, production runs from existing tooling 2-4 weeks. Naval brass C464 machined parts run 1-2 weeks longer than equivalent C360 parts due to slower cutting speeds and the need to source C464 rod, which is not as broadly stocked.
Last updated: July 2026
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