Brass Machined Parts Suppliers Tupelo, MS

Karl Gillihan

🟡 BRASS

Brass Machining and Fabrication in Tupelo, MS

Among all commonly machined metals, brass offers the most favorable combination of machinability, corrosion resistance, and cost-effectiveness for small to medium precision parts. Tupelo's CNC turning shops — many of which got their start on furniture hardware and moved into automotive and industrial components — can machine C360 free-cutting brass at surface speeds above 400 surface feet per minute, producing valve bodies, fittings, connector inserts, and sensor housings in quantities from prototype through tens of thousands of pieces. If your design is running in brass or could be converted to brass, northeast Mississippi has the supplier capability to produce it.

ISO 9001IATF 16949ISO 14001

C360 (UNS C36000) contains 61.5 percent copper, 35.5 percent zinc, and 3 percent lead. The lead addition acts as a built-in chip breaker, producing short discontinuous chips and a machinability index of 100 — the reference standard against which all other metals are measured. Tupelo CNC screw machine and turning shops can run C360 at spindle speeds that would destroy tooling in stainless steel, producing tight-tolerance parts with excellent surface finish and minimal tool wear per piece. Typical applications for C360 in Tupelo's supplier network include valve stems and bodies for fluid-handling systems, electrical connector inserts, fitting bodies for pneumatic and hydraulic systems, and decorative hardware for commercial and automotive trim applications. Tolerances of plus or minus 0.001 inch on turned diameters and plus or minus 0.002 inch on machined features are routinely held. Surface finish of 63 Ra microinch is standard; 32 Ra and better is achievable with a light finish pass and sharp tooling. The material's low tool wear rates make it economical for high-volume production where tooling cost is a significant fraction of part cost on harder materials.

C260 Cartridge Brass for Forming and Deep Draw Applications

C260 (UNS C26000) is the 70-30 copper-zinc alloy, containing 70 percent copper and 30 percent zinc. It is not a free-machining alloy — its machinability index is roughly 30, compared to 100 for C360 — but it offers far superior formability, with elongation values above 65 percent in the annealed condition. This makes C260 the sheet alloy of choice for stampings, deep-drawn shells, formed brackets, and any application where severe cold working is part of the manufacturing process. Tupelo press and stamping shops use C260 sheet and coil for switch contact stampings, terminal clips, relay springs, and decorative formed parts. The high ductility allows draw ratios up to 3:1 in a single draw operation on a properly designed tool. Spring temper C260 (H08 condition, approximately 120,000 psi tensile) is specified for contact springs and clip components where elastic recovery is critical to maintaining contact force over service life. Regional spring and stamping suppliers work C260 in gauges from 0.005 inch up to 0.125 inch on progressive die tooling.

Finishing, Plating, and Post-Processing for Brass Parts

Brass parts from Tupelo suppliers are typically delivered in one of four surface conditions: as-machined (natural brass color), tumble-deburred and bright, electroplated, or lacquered. Bright tumble finishing in vibratory media is standard for most automotive and industrial parts, removing burrs and providing a uniform satin appearance. Electroplating options available regionally include tin, nickel, chrome, and gold through specialty plating vendors within a one-day shipping radius. Nickel plating at 0.0002 to 0.0005 inch is commonly applied to brass connector bodies and valve stems where a harder, more corrosion-resistant surface is needed than bare brass provides. Chrome plating on decorative brass hardware follows a nickel strike layer for adhesion. For RoHS-compliant automotive programs, lead-free plating processes are required — this matters when specifying C360 brass, which contains 3 percent lead and can be a regulatory consideration in some end-use applications. Buyers should address RoHS compliance in the purchase order and confirm the plating vendor's process credentials.

Naval Brass for Corrosion-Resistant Structural Applications

Naval brass (C46400, UNS C46400) is a 60-40 copper-zinc alloy with 0.75 to 1.0 percent tin added to improve dezincification resistance in marine and mildly corrosive environments. Its tensile strength of 55,000 psi minimum and yield of 25,000 psi in the annealed condition give it more structural integrity than C360 while retaining adequate machinability at roughly 40 percent of C360's index. In northeast Mississippi's industrial market, Naval brass is specified for valve components, pump shafts, marine hardware, and structural fittings used in water treatment and agricultural irrigation systems. The dezincification resistance that the tin addition provides prevents the selective leaching of zinc that causes stress-corrosion cracking in standard 70-30 brasses exposed to slow-moving or stagnant freshwater — a relevant failure mode for irrigation fittings in Mississippi's agricultural sector. Tupelo shops machining Naval brass use carbide tooling at moderate speeds, similar to machining 316L stainless but with better chip control.

Frequently Asked Questions

C360 free-cutting brass achieves a machinability index of 100 — the baseline against which all other metals are scored — because its 3 percent lead content creates fine discontinuous chips that clear the cutting zone cleanly, even at high spindle speeds. This translates directly into faster cycle times, better surface finish, longer tool life, and lower cost per part compared to machining pure copper C110 (machinability index roughly 20) or Naval brass (index around 40). For CNC turning shops in Tupelo running 500 to 5,000 pieces of a valve body or connector insert, C360 is the clear economic choice when the application can tolerate its moderate corrosion resistance and the lead content is not a regulatory concern. When RoHS compliance rules out leaded brass, bismuth-bearing free-cutting brass C36000-equivalent grades are available as a substitute.

C360 brass is one of the most dimensionally predictable materials to machine, and Tupelo CNC shops hold plus or minus 0.001 inch on turned diameters as a standard production tolerance. Critical sealing diameters on valve stems can be held to plus or minus 0.0005 inch with a dedicated finishing pass on a stable spindle. Threaded features in brass are extremely clean and dimensionally consistent because the material cuts without the tearing or smearing that occurs in soft pure copper. Tapped holes in C360 achieve 6H thread tolerances with standard tooling and minimal tap wear. For complex milled features in C260 sheet stampings, plus or minus 0.005 inch on formed dimensions is typical, with tighter tolerances achievable on machined features in the blank before forming.

Standard C360 brass is acceptable for many underhood fluid fittings — coolant, oil, transmission fluid — in temperature ranges up to roughly 150 degrees Celsius continuous. Its corrosion resistance against these fluids is good, and its machinability keeps fitting production cost low. However, brass is not recommended for contact with ammonia-bearing fluids or atmospheres (common in some industrial environments) because ammonia causes stress-corrosion cracking. For fittings exposed to ethanol-blended fuels at elevated pressure, dezincification can be a concern with standard 60-40 brass; Naval brass or DZR (dezincification-resistant) rated brass is the proper specification. Buyers should review the fluid compatibility table for their specific brass grade and service condition before final specification.

Brass chips have significant scrap value — typically 60 to 80 percent of new material cost depending on copper commodity pricing — so reputable Tupelo machine shops segregate brass chips by alloy grade rather than mixing with steel or aluminum. C360 chips are collected in dedicated bins and sold to regional scrap dealers who resell to brass mill recyclers. Shops that run multiple brass alloys keep separate bins for C360, C260, and Naval brass to maximize scrap value and avoid downgrading mixed loads. For buyers on blanket orders with significant monthly volumes, some shops will pass a portion of scrap credit back through lower piece pricing on renegotiated agreements. It is worth asking about this on programs above 500 pounds of brass per month.

Yes. Press shops in the Tupelo area with progressive die tooling can produce C260 brass stampings with plus or minus 0.010 inch on critical formed dimensions and plus or minus 0.005 inch on punched hole locations. Spring-back in annealed C260 is moderate and predictable, so die tooling is designed with a compensating overbend of typically 2 to 5 degrees to achieve the specified angle after release. In H04 or H08 temper C260 used for contact springs, spring-back is larger and must be carefully accounted for in tool design — typically requiring a prototype tool validation run before production tooling is finalized. First article inspection with a checking fixture or CMM report is standard for automotive stamping programs.

Last updated: July 2026

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