Brass Supply & CNC Machining Oshkosh WI

Karl Gillihan

🟡 BRASS

Brass Fittings, Bar Stock, and CNC Machining in Oshkosh, WI — C360, C260, and Naval Brass

Ask any machinist in the Fox Valley what material they prefer to cut and the answer is almost always the same: brass. C360 free-cutting brass machines at a machinability rating of 100 — the reference against which all other materials are measured — producing short chips, excellent surface finish, and consistent dimensions at the highest sustainable spindle speeds. In Oshkosh's industrial market, that machinability translates directly to business value: fire apparatus pump body components, defense vehicle fuel system fittings, hydraulic valve bodies, and access equipment pneumatic components are all high-volume turned and milled parts where brass's machining efficiency and corrosion resistance justify its cost over stainless alternatives. ManufacturingBase maps the Fox Valley brass suppliers and machining shops with the specific alloy inventory and process credentials that Oshkosh OEM programs require.

ISO 9001AS9100ISO 14001

Fire apparatus pump systems represent one of the most demanding brass applications in Oshkosh's industrial market. NFPA 1901 requires fire pumps to deliver rated flow at rated pressure without exceeding temperature rise limits, and the bronze and brass valve bodies, discharge gates, pressure relief valves, and gated wye fittings that populate a modern custom apparatus involve precise internal geometry to ensure correct flow characteristics. While bronze (covered separately) is common for wet-side pump housings, brass C360 is the standard for machined valve bodies, stem packing glands, and threaded connection components on the dry side of the pump circuit. The combination of C360's excellent thread-forming characteristics (threads cut cleanly without tearing, producing gas-tight joints with standard thread tolerances) and corrosion resistance in water service makes it the natural material for threaded fittings in fire pump manifold assemblies. Defense vehicle fuel system components represent a second high-volume brass application in the Oshkosh market. Fuel filter housings, petcock valves, fuel line fittings, and primer pump bodies in military diesel applications are commonly machined from C360 brass bar stock. Brass's resistance to corrosion from diesel fuel, biodiesel blends, and JP-8 jet fuel (the military's universal fuel) over the 20-year vehicle service life eliminates the galvanic corrosion and fitting seizure problems that zinc die-cast fittings develop in vehicles stored in field conditions with moisture infiltration. Military programs typically specify brass fittings to MIL-DTL-20168 or reference NPT thread standards with documented material certifications. Access equipment from Oshkosh Corporation's JLG brand includes pneumatic and hydraulic control valve assemblies that use machined brass valve bodies, flow control cartridges, and manifold plates. The precision required in these components — bore concentricity within 0.002 in, port geometry controlling flow area to ±2% — reflects the performance sensitivity of the hydraulic control circuits governing boom extension and platform leveling. Fox Valley machine shops supporting JLG supply chain work maintain tooling programs optimized for high-volume brass turning that consistently produce these components at competitive cycle times.

C360, C260, and Naval Brass — Grade Characteristics and Oshkosh Application Fit

C360 free-cutting brass (61.5% copper, 35.5% zinc, 3% lead) is the gold standard for CNC-machined brass components. The lead additions form finely dispersed particles in the brass matrix that act as built-in chip breakers, producing short, easily evacuated chips at all cutting speeds and feed combinations. Machinability rating of 100 means it is the fastest-machining standard alloy available — a turning operation that takes 60 seconds in aluminum might take 45 seconds in C360 due to the ability to run higher surface speeds with aggressive feed rates and maintain tool life. Minimum tensile strength of 58 ksi in the half-hard condition and yield of 45 ksi are adequate for most fittings, valve bodies, and threaded components where the loading is primarily pressure differential rather than structural bending or impact. The lead content in C360 creates a significant environmental and regulatory consideration that buyers must address for certain programs. California Proposition 65 and the NSF 61 standard for drinking water contact both restrict lead content in plumbing fittings used in potable water systems. For fire apparatus components in water systems serving as potable water back-up supplies, C360 is not acceptable — buyers must specify C69300 eco-brass or C87850 silicon bronze as lead-free alternatives. For non-potable water applications, fuel systems, hydraulic systems, and structural components, C360's lead content presents no regulatory restriction. Buyers sourcing brass for Oshkosh defense and heavy-equipment programs should confirm application requirements before defaulting to C360. C260 cartridge brass (70% copper, 30% zinc) is the forming and deep-drawing grade. Its higher copper-to-zinc ratio produces greater ductility — elongation of 40–50% versus 25–30% for C360 — enabling deep-drawn shell cases, formed tube shapes, and stampings that would crack in C360. The name 'cartridge brass' reflects its historical use in ammunition cartridge cases, which require deep drawing of a thick-walled cup into a thin-walled cylindrical case. In Oshkosh's industrial market, C260 appears in formed tube and duct components, electrical connectors and terminals formed from strip, and stamped brackets where the combination of electrical conductivity and formability is required. Naval brass (C464, 60% copper, 39.2% zinc, 0.8% tin) adds tin to the zinc-copper base to suppress dezincification — the selective leaching of zinc that occurs in stagnant water conditions — making it the standard for seawater and marine-environment fittings, and for propeller shafts and marine hardware where dezincification resistance is the governing material requirement.

Sourcing Brass Bar Stock and Fittings in the Oshkosh Region

C360 brass round bar in diameters from 0.250 to 4.0 in is stocked at Fox Valley and Milwaukee-area metal service centers in 12-ft standard lengths. Hex bar in standard wrench-flat sizes is also commonly stocked for nut and fitting production. Most regional distributors can cut to length for a small cutting charge, enabling near-net blanks that reduce CNC setup waste material and machine cycle time. C260 sheet and strip in standard gauges (0.010–0.125 in) is available from brass mills and distributors with 1–2 week lead times in standard widths. Naval brass C464 is a specialty item — not stocked at general distributors but available from marine-industry specialists and brass mill distributors in 2–4 weeks for standard bar and plate sizes. For high-volume production programs, direct mill purchasing of C360 bar in custom diameters or hex sizes can reduce material cost by 15–25% compared to distribution pricing, typically with minimum orders of 1,000–2,000 lbs and 4–6 week lead times from domestic brass mills. Buyers should confirm RoHS compliance and REACH restriction documentation for any brass destined for products sold in the European market, as lead content in C360 requires specific RoHS exemption documentation (currently exempt for machining applications but with ongoing regulatory review). ManufacturingBase supplier listings for Oshkosh-area brass suppliers include grade availability, minimum order quantities, and certification capabilities so buyers can match sourcing approach to program volume and schedule.

Precision Machining of Brass Components in the Fox Valley Market

The Fox Valley's machining infrastructure is well-equipped to handle brass work efficiently. CNC turning centers running C360 bar stock can produce complete turned and cross-drilled fittings in cycle times that make brass components highly competitive per piece even at relatively small production volumes. Swiss-turn CNC machines — capable of turning parts up to 1.25 in diameter complete in a single setup from bar stock — are available in several Fox Valley shops and are particularly suited to high-volume brass fitting production where the standard complexity involves threaded ODs, drilled and tapped cross-ports, and internal counterbores, all achievable in a single Swiss-turn cycle without part transfer. Four-axis and five-axis CNC milling of brass manifold plates — flat or contoured bodies with arrays of drilled and tapped ports, cross-drilled passages, and O-ring groove features — is standard capability in the Oshkosh region. Brass manifold plates for hydraulic control systems in access equipment typically involve 20–50 features per part on multiple faces, with port position tolerances of ±0.005 in and O-ring groove dimensions of ±0.002 in critical to leak-free performance. Shops running Haas, Mazak, or Okuma multi-axis machining centers with 4th-axis rotary indexing can machine these features in 2–3 setups, achieving repeatability that supports 100% dimensional inspection on production lots. Surface finishing of brass components for defense and fire apparatus programs often includes electroless nickel plating (for corrosion resistance and hardness in wear-surface areas), chrome plating (for decorative finish on apparatus hardware visible in the completed vehicle), or selective passivation. Nickel-plated brass achieves surface hardness of 48–50 HRC on the deposit layer, significantly improving wear resistance on soft-seated valve components. Local and regional plating shops in the Fox Valley and Milwaukee area support these finishing requirements, and shops coordinating machining-plus-plating supply chains can offer turnkey finished-part delivery that simplifies procurement for Oshkosh OEM programs.

Frequently Asked Questions

C360 free-cutting brass achieves a machinability rating of 100 — the reference standard against which all other metals are measured. Its 3% lead content creates finely dispersed particles that break chips into short segments at all cutting speeds, preventing the long, stringy chips that clog cutting zones and cause dimensional inconsistency in pure copper and other metals. At surface speeds of 300–500 SFM with carbide tooling, C360 produces surface finish below Ra 63 µin consistently, enabling precision-turned fitting bodies to be produced complete in single setups with minimal tool changes. The combination of fast cycle times, long tool life, and consistent dimensional control makes C360 the most cost-effective material for high-volume turned components in fire apparatus fittings, fuel system hardware, and hydraulic valve bodies across Oshkosh's OEM supply chain.

Naval brass C464 (60% copper, 39.2% zinc, 0.8% tin) should be specified for components exposed to stagnant or slow-moving fresh or salt water where dezincification is a risk. Dezincification is the selective leaching of zinc from alpha-beta brass alloys in certain water chemistries, particularly soft or slightly acidic water with low chloride, leaving a porous copper-rich structure that has lost its original strength and pressure integrity. C360 with its high zinc content is susceptible to dezincification — a fitting that looks intact externally may have a severely weakened wall internally. Naval brass's tin content significantly inhibits this mechanism, making C464 the appropriate specification for fire apparatus suction fittings and intake valves exposed to pond, lake, or river water sources, marine fittings, and condensate drain components in equipment stored in humid environments. The machinability of C464 is approximately 30 versus 100 for C360, so machining costs are higher.

Yes. For applications that must comply with NSF 61 (drinking water system components) or California Proposition 65 lead restrictions — such as fire apparatus fittings connected to potable water supply systems or water treatment equipment — several lead-free brass alternatives are available. C69300 eco-brass (bismuth-silicon-lead-free alloy) achieves machinability approximately 70–80% of C360 and is certified for NSF 61 applications. C87850 silicon bronze and C69100 low-lead brass are additional options with varying machinability and mechanical property profiles. These alloys are available from specialty brass distributors and some regional service centers, typically at 2–4 week lead time. Machining shops working with lead-free brass should expect slightly longer cycle times and higher tooling consumption than with C360 — factor this into RFQ pricing expectations.

Fox Valley CNC shops turning brass routinely produce NPT, NPTF, UN, UNF, BSPP, and metric threads in brass to 6g/6H tolerance class as a standard production capability. Single-point thread turning on CNC lathes produces threads with pitch diameter tolerances within ±0.001 in at standard production rates. Thread milling, used for internal threads in blind holes where tap breakage risk is a concern, is available at shops with full tooling programs for brass. For NPT pipe threads requiring pressure-tight makeup, thread form quality is critical — the taper angle (1/16 in/in, or 1°47') must be held accurately for proper thread engagement. Tapping of internal threads in brass at high production volume is typically done with HSS or carbide spiral-flute taps running with cutting oil lubricant; shops achieving consistent thread quality measure several pieces per lot with thread gauges per ASME B1.20.1 to verify compliance.

For brass bar stock entering defense vehicle programs, request certification to ASTM B16 (C360 free-cutting brass rod, bar, and shapes) or ASTM B36 for C260 sheet and strip. The certification should include: copper and zinc chemistry as percentages on the actual production heat, lead content for C360 (should be 2.5–3.7%), mechanical properties (UTS and yield) from lot testing, and the originating mill's name and heat number. For DFARS applicability, brass falls under specialty metals provisions when incorporated into defense articles — confirm domestic melt sourcing if your contract includes DFARS 252.225-7009. For RoHS-compliant programs, request a declaration of conformance to RoHS Directive 2011/65/EU including the applicable lead exemption documentation. Require certifications to accompany each shipment and retain them as part of your production lot traceability records.

Last updated: July 2026

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