🔌 COPPER
Copper Machining and Fabrication in Lansing, MI — EV, Electrical, and Industrial Copper Suppliers
Copper sourcing in Lansing has taken on new urgency as GM's electrification push reshapes the local supply chain. Where copper once flowed primarily through wiring harness assemblies and sensor connectors, EV powertrain components — motor windings, bus bars, cooling plates, and charging system hardware — are now driving demand for precision-machined and fabricated copper at volumes the automotive supply chain is still scaling to meet. Lansing buyers can access C101, C110, and tellurium copper from a supplier base calibrated to tight tolerances, high conductivity requirements, and the documentation standards of automotive production.
ISO 9001IATF 16949ISO 14001
C110 electrolytic tough pitch (ETP) copper is the standard electrical-grade copper for the vast majority of conductivity-critical applications. With electrical conductivity at 101% IACS and thermal conductivity of 226 BTU/hr·ft·°F, C110 is the material of choice for bus bars, motor windings, transformer components, and electrical connectors throughout the automotive and electrical manufacturing supply chain. In the Lansing EV supply context, C110 bus bars are stamped, machined, and assembled into battery modules, inverters, and charging systems. The material is readily available in strip, bar, plate, and tube from Michigan-area service centers.
C101 oxygen-free copper (OFC, 99.99% Cu minimum) is specified where freedom from hydrogen embrittlement in reducing or vacuum atmospheres is required — primarily electronic components, vacuum tubes, and applications involving high-temperature brazing or welding in reducing atmospheres. C101 has slightly higher conductivity (101% IACS) than C110 in its as-drawn condition and is specified in precision electronic applications where long-term conductivity stability under thermal cycling is important. In Lansing, C101 demand is primarily from electronics and defense-adjacent manufacturing rather than mainstream automotive production.
Tellurium copper (C145) is the machinability-optimized copper alloy, containing 0.4–0.7% tellurium to dramatically improve chip breaking and surface finish in CNC machining. Its electrical conductivity is approximately 90–93% IACS — reduced from C110 but still excellent for most connector and terminal applications. C145 is the standard specification for screw machine products, connector pins, terminals, and precision-turned copper components where machining throughput and surface finish matter. Shops in the Lansing area running large quantities of copper connectors and terminal components will prefer C145 over C110 for its predictable machining behavior.
Machining Copper in the Lansing CNC Ecosystem
Copper's machinability challenges are distinct from steel or aluminum. C110 ETP copper is notoriously gummy — it produces long, stringy chips that wrap around tools, builds up on cutting edges (BUE), and gives poor surface finish in standard machining programs designed for steel or aluminum. The solution is three-fold: use sharp, high-positive-rake tooling (polycrystalline diamond inserts are preferred for production runs), run high cutting speeds with adequate coolant, and consider the material's tendency to smear rather than cut cleanly.
Tellurium copper (C145) was developed specifically to address these challenges, and it machines dramatically better than C110 — chips break cleanly, surface finish is predictable, and tool life is significantly extended. For components where conductivity loss from 101% to 93% IACS is acceptable, specifying C145 instead of C110 for machined components reduces cost and improves quality. Lansing machine shops with copper programs typically maintain separate tooling and program libraries for copper versus steel and aluminum.
Bus bar production — cutting, bending, drilling, and plating copper bar to specified electrical and dimensional requirements — is a service available in the Lansing area from shops serving the growing EV supply chain. Bus bars in C110 ranging from 0.125" to 0.5" thickness, with tin or nickel plating for oxidation resistance at terminations, are a production item for several mid-Michigan shops. Tight flatness requirements (0.005" per foot or better for large bus bars) are achievable with proper material handling and stress-relief procedures.
EV Powertrain Copper Applications and the Lansing Supply Chain
General Motors' commitment to electric vehicles is physically reshaping the manufacturing supply chain in mid-Michigan. Factory ZERO in Detroit-Hamtramck is producing the GMC Hummer EV and Silverado EV, and the ripple effects flow through the Michigan supplier base including Lansing-area Tier-1 and Tier-2 shops. EV copper requirements are qualitatively different from ICE vehicle copper work: motor stator windings require flat copper (hairpin wire) stamped and formed to very tight dimensional tolerances; high-voltage bus bars require electrical isolation routing, plating, and assembly into modules; cooling plates for battery thermal management are often machined or extruded copper with internal passages.
The shift to EVs is generating new capability investment in Lansing-area suppliers. Shops that previously focused on stamped steel brackets or turned aluminum components are adding copper processing cells to serve EV programs. Buyers sourcing EV copper components from Lansing should ask specifically about a supplier's EV program experience and current production volume — capability acquired six months ago for a prototype program is different from a mature production cell running thousands of bus bars per week.
For thermal management copper — heat spreaders, cold plates, and vapor chamber components used in inverter cooling — machined C110 plate with brazed or friction-stir-welded covers provides the internal channel structures required. Friction stir welding of copper is a newer capability present at a small number of Michigan shops, producing hermetic, high-strength joints without the thermal distortion of fusion welding. Buyers needing copper cold plates should ask about both conventional machining-plus-brazing and FSW alternatives when soliciting quotes.
Frequently Asked Questions
C110 electrolytic tough pitch copper is the most widely available grade in the Lansing market for bus bar, strip, and plate applications. Regional service centers stock C110 in standard thicknesses from 0.032" to 2.0" and in bar form up to 4" diameter with short lead times. C101 oxygen-free copper is available through specialty metals distributors at somewhat longer lead times. Tellurium copper (C145) is stocked in bar and rod form for screw machine and precision machining applications. For EV-specific bus bar applications, C110 strip in tempered condition (H04 or H02) is the production standard — the temper affects springback in forming and conductivity slightly, so specify the temper required for your application. Plating (tin per ASTM B545, nickel per ASTM B689) is available through the mid-Michigan plating network.
Copper bus bar fabrication in the Lansing area typically involves saw or shear cutting to length, CNC drilling and punching of connection holes, CNC or press bending to required angles, and deburring and surface preparation. Dimensional tolerances on bus bar length are typically ±0.010", on hole locations ±0.005", and on bend angles ±1 degree. Flatness requirements — critical for low-resistance electrical joints — are typically specified at 0.005" per foot or better, achievable with proper material storage (no stacking-induced set) and stress-relief procedures. Post-fabrication plating to ASTM B545 (electrodeposited tin) provides oxidation resistance at terminations and ensures reliable bolted joint resistance over the vehicle life. Nickel plating (ASTM B689) is specified for higher-temperature applications. Plating thickness is typically 0.0003"–0.0005" for tin, 0.0002"–0.0003" for nickel on bus bar termination areas.
Yes, particularly using tellurium copper (C145) which machines predictably and holds tolerances well. For turned connector components and terminals in C145, tolerances of ±0.001" on critical diameters and ±0.002" on overall length are achievable in production. C110 ETP copper can also be machined to these tolerances, but requires more attention to tool sharpness and cutting parameters to avoid dimensional variation from built-up edge and material smearing. Swiss-type CNC screw machines are the preferred equipment for high-volume small-diameter copper connector components — several shops in the mid-Michigan region run Swiss machines producing millions of copper terminals per year for automotive connector programs. For larger precision copper components (bus bar terminal pads, motor commutator segments), vertical and horizontal CNC machining centers hold ±0.001" routinely in tellurium copper.
For electrical applications, specify conductivity in terms of percent IACS (International Annealed Copper Standard) or specify the grade designation that implies it. C110 ETP copper must meet 101% IACS minimum per ASTM B187/B152. C101 OFC copper meets the same 101% IACS standard with the additional oxygen content restriction. Tellurium copper C145 is specified at 90–93% IACS — acceptable for most connector and terminal applications but not for high-current bus bar where maximum conductivity is critical. After plating (tin or nickel), the base copper conductivity is unchanged, but verify that the plating subcontractor does not have excessive current-limiting contact resistance at termination surfaces from over-thick plating or poor adhesion. For EV high-voltage applications (400V or 800V battery systems), contact resistance at bolted bus bar joints is a reliability-critical specification — require that your supplier verify joint resistance per IEC 61439 or equivalent during first-article qualification.
C101 oxygen-free copper is available in the Lansing market through specialty metals service centers, typically with 1–3 week lead times for standard bar and plate sizes. It is specified when applications involve hydrogen atmosphere brazing or welding (where oxygen in ETP copper can cause hydrogen embrittlement), vacuum-tube or microwave components where outgassing is a concern, or precision electronic applications requiring maximum long-term conductivity stability. C101 is not required for standard bus bar, terminal, or connector applications where C110 or C145 performs equally well — specifying C101 for routine electrical components adds cost without benefit. The premium over C110 is typically 10–20% on the raw material. For brazing operations in reducing atmospheres (common in heat exchanger and cooling plate manufacturing), C101 eliminates the risk of steam explosions at grain boundaries that ETP copper can experience when hydrogen contacts copper oxide inclusions at elevated temperatures.
Last updated: July 2026
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