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7075 Aluminum", "item": "https://www.olympusmachining.com/materials/6061-vs-7075-aluminum" } ] }, { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is the main difference between 6061 and 7075 aluminum?", "acceptedAnswer": { "@type": "Answer", "text": "6061-T6 is a magnesium-silicon alloy with ~45 ksi tensile strength, excellent weldability and corrosion resistance, and lower cost. 7075-T6 is a zinc-alloyed aluminum with ~83 ksi tensile strength — nearly double 6061 — but it is not weldable in production practice, has reduced corrosion resistance, and costs roughly 2–3× more." } }, { "@type": "Question", "name": "Which is easier to machine, 6061 or 7075?", "acceptedAnswer": { "@type": "Answer", "text": "Both machine well. 7075-T6 is typically rated slightly higher on the machinability index (~70 vs ~50 for 6061-T6) because its higher hardness produces cleaner chips and better surface finishes at high speeds. 6061 is more forgiving for thin walls and tapping operations." } }, { "@type": "Question", "name": "When should I choose 7075 over 6061?", "acceptedAnswer": { "@type": "Answer", "text": "Choose 7075-T6 when strength-to-weight is critical and the part will not be welded or exposed to corrosive marine/chemical service — aerospace structural fittings, defense receivers, high-load brackets, and tooling plates. Choose 6061-T6 for weldments, fluid-handling parts, anodized housings, marine hardware, and general structural work." } } ] } ] } ] --- [Home](/) [CNC Milling](/cnc-milling) [CNC Turning](/cnc-turning) [Quality Assurance](/quality-assurance) [CNC Machining Capabilities](/capabilities) [CNC Machining Services](/cnc-machining) [Quality Program](/quality) [Contact Olympus Machining](/contact) [Prototype to Production](/prototype-to-production) [Industries Served](/industries-served) [Materials Machined](/materials-machined) [Robotics & Automation Machining](/robotics-automation-machining) [Precision CNC Machining](/precision-cnc-machining) [Compliance & Cybersecurity](/compliance) [Privacy Policy](/privacy-policy) [Blog](/blog) [Sitemap](/sitemap) [Pennsylvania CNC Machining](/areas-served/pennsylvania-cnc-machining) [Maryland CNC Machining](/areas-served/maryland-cnc-machining) [Virginia CNC Machining](/areas-served/virginia-cnc-machining) [Delaware CNC Machining](/areas-served/delaware-cnc-machining) [New Jersey CNC Machining](/areas-served/new-jersey-cnc-machining) [New York CNC Machining](/areas-served/new-york-cnc-machining) [Ohio CNC Machining](/areas-served/ohio-cnc-machining) [West Virginia CNC Machining](/areas-served/west-virginia-cnc-machining) [Washington DC CNC Machining](/areas-served/washington-dc-cnc-machining) [North Carolina CNC Machining](/areas-served/north-carolina-cnc-machining) [Aerospace Machining Tolerances Explained](/blog/aerospace-machining-tolerances-explained) [Titanium CNC Machining for Aerospace](/blog/titanium-cnc-machining-aerospace) [Aerospace CNC Machine Shop Near DC/MD](/blog/aerospace-cnc-machine-shop-near-washington-dc-maryland) [Cutting-Edge CNC Shop for Aerospace](/blog/cutting-edge-cnc-machine-shop-aerospace-industry) [Best CNC Machine Shop in Hanover, PA](/blog/best-cnc-machine-shop-hanover-pa) [QMS: Precision, Traceability, Process Control](/blog/quality-management-system-qms-precision-traceability-process-control) [Vet a CNC Shop in Pennsylvania](/blog/vet-cnc-machine-shop-pennsylvania-aerospace-defense-robotics) [CNC Shops in Rural America: Hanover, PA](/blog/cnc-machine-shop-rural-america-hanover-pa) [Aerospace CNC Machining in Pennsylvania](/blog/aerospace-cnc-machining-pennsylvania) [CNC Prototyping in PA](/blog/cnc-prototyping-pa) [CNC Machining in Pennsylvania](/blog/cnc-machining-pennsylvania) [Choosing CNC Machining Vendors](/blog/choosing-machining-vendors-cnc-machining-shop) [CNC Machining for Robotics — Guide](/blog/cnc-machining-for-robotics-automation-guide) [CNC Machining Parts for Robotics](/blog/cnc-machining-for-robotics-automation) [Prototype-to-Production CNC Machining](/blog/prototype-to-production-cnc-machining) [How OEMs Evaluate CNC Machine Shops](/blog/how-oems-evaluate-cnc-machine-shops) [CMM Inspection at Olympus Machining](/blog/cmm-inspection-enhances-quality-and-repeatability-at-olympus-machining) [ITAR & CMMC Level 1 in Precision CNC Machining](/blog/itar-cmmc-level-1-precision-cnc-machining) [Precision CNC Machining in Hanover, PA](/blog/precision-cnc-machining-hanover-pa) [AS9102 First Article Inspection Checklist](/blog/as9102-first-article-inspection-checklist) [AS9102 First Article Inspection](/as9102-first-article-inspection) [AS9102 FAI vs PFAI](/as9102-fai-vs-pfai) [AS9102 Balloon Drawings](/as9102-balloon-drawings) [CMM Inspection Services](/cmm-inspection-services) [Medical-Grade Alloys](/materials/medical-grade-alloys) [CMMC Level 1 Compliance](/compliance/cmmc-level-1) [Olympus vs Xometry](/comparison/olympus-vs-xometry) [Olympus vs Protolabs](/comparison/olympus-vs-protolabs) [Direct Shop vs Marketplace](/comparison/direct-shop-vs-marketplace) [Aerospace & Defense Machining](/industries/aerospace-defense) [Medical Device Machining](/industries/medical-devices) [Firearms & Suppressor Machining](/industries/firearms-suppressors) [Energy & Oil/Gas Machining](/industries/energy-oil-gas) [Philadelphia CNC Machining](/areas-served/philadelphia-cnc-machining) [Pittsburgh CNC Machining](/areas-served/pittsburgh-cnc-machining) [Baltimore CNC Machining](/areas-served/baltimore-cnc-machining) [Titanium CNC Machining](/materials/titanium-cnc-machining) [PEEK CNC Machining](/materials/peek-cnc-machining) [Inconel CNC Machining Guide](/materials/inconel-cnc-machining-guide) ![Olympus Machining LLC logo — precision CNC machining shop in Hanover, Pennsylvania](/assets/olympus-logo-DbWcTX06.webp) HomeAboutServices[Blog](/blog)Contact[Careers](/careers)[(717) 634-5094 ](tel:+17176345094)[Login](/auth)Get Quote [Back to Materials](/materials-machined) # Aluminum 6061 vs 7075: Properties, Machinability & Cost 6061-T6 and 7075-T6 are the two most commonly specified wrought aluminum alloys in CNC machined parts. This guide compares their mechanical properties, machinability, weldability, corrosion resistance, and cost from the perspective of a U.S.-based, ITAR-registered CNC machining shop in Hanover, Pennsylvania. ## Quick Reference - **6061-T6:** Mg-Si alloy. ~45 ksi tensile. Weldable, corrosion-resistant, anodizes well, low cost. AMS 4027 / ASTM B221. - **7075-T6:** Zn-Mg-Cu alloy. ~83 ksi tensile. Not weldable in production, reduced corrosion resistance, 2–3× cost. AMS 4045 / QQ-A-250/12. ## Property Comparison Table Property 6061-T6 7075-T6 Ultimate tensile strength 45 ksi (310 MPa) 83 ksi (572 MPa) Yield strength 40 ksi (276 MPa) 73 ksi (503 MPa) Elongation at break 12–17% 11% Brinell hardness 95 HB 150 HB Density 2.70 g/cm³ 2.81 g/cm³ Modulus of elasticity 10.0 Msi (68.9 GPa) 10.4 Msi (71.7 GPa) Fatigue strength (5×10⁸ cycles) 14 ksi 23 ksi Machinability rating ~50 ~70 Weldability Excellent (TIG, MIG) Poor — not recommended Corrosion resistance Excellent Fair — usually anodized or Alclad Relative cost (per lb) 1.0× (baseline) 2.0–3.0× Primary alloying elements Mg, Si Zn, Mg, Cu Values are typical for T6 temper bar/plate stock per ASM Aerospace Specification Metals data. Actual values vary by mill, lot, and certification. ## Machinability Notes Both alloys are friendly to high-speed CNC milling and turning. The practical differences show up in chip control, surface finish, and thin-wall behavior. - **6061-T6:** Softer and more ductile. Chips tend to be stringy without proper geometry — we run polished-flute, high-rake aluminum-specific tooling with through-tool coolant or mist. Built-up edge can occur at low surface speeds; we keep SFM above ~1,000 for 1/2" end mills. Excellent for tapping and thin-wall pockets where elastic deflection is a concern. - **7075-T6:** Harder and produces shorter, cleaner chips — generally rated ~70 on the machinability index versus ~50 for 6061. Higher surface speeds (1,500–4,000 SFM with carbide) are routine. Better natural surface finish, which matters for as-machined Class 2 finishes and aerospace cosmetic requirements. Slightly more sensitive to residual-stress distortion when removing large pocket volumes from plate stock — we rough, stress-relieve where required, then finish. ## Design-for-Manufacturability (DFM) Guidance - **Weldments → 6061.** 7075 is not weldable in production — the heat-affected zone cracks and loses 40–60% of its strength. Any welded assembly should be specified in 6061-T6 (welded, then T6 re-heat-treated if strength is critical) or 5083 for marine service. - **Anodized cosmetic parts → 6061.** 6061 accepts Type II (decorative) and Type III (hard-coat) anodize with consistent color. 7075's copper content produces a darker, less uniform anodize finish — Type III on 7075 is common for tooling but cosmetically variable. - **Strength-driven aerospace / defense parts → 7075.** When the load case sets the wall thickness or pocket depth, 7075-T6's ~83 ksi tensile lets us thin-wall further and reduce mass — common for aerospace structural fittings, receivers, and bracketry per AMS 4045. - **Marine / wet-service → 6061 (or 5083).** 7075 is susceptible to stress-corrosion cracking in the short-transverse direction unless specified in -T73 or -T7351 temper. Default to 6061-T6 for fluid-handling and marine hardware. - **Tooling plates and fixtures → 7075 or MIC-6.** 7075-T651 plate (stress-relieved) holds tolerance through heavy stock removal. For dimensional stability without strength requirements, cast tooling plate (MIC-6) is a lower-cost alternative. - **Cost-sensitive volume parts → 6061.** 6061 raw stock typically runs $3–5/lb versus $8–12/lb for 7075. For production runs where the design isn't strength-driven, the alloy choice is the single largest material cost lever. ## Common Applications We Machine 6061-T6 - • Anodized enclosures and housings - • Welded weldments and frames - • Fluid-handling manifolds - • Marine and outdoor hardware - • Optical and laser-mount baseplates - • General-purpose machined brackets 7075-T6 / T651 - • Aerospace structural fittings (AMS 4045) - • Defense receivers and chassis - • High-load brackets and clevises - • Plastic injection-mold tooling plates - • Drone and UAV airframe components - • High-stress motorsport hardware ## How Olympus Machines Both Alloys Both 6061-T6 and 7075-T6 are routine production materials at our Hanover, PA shop. We process them on 3-axis, 4-axis, and live-tool turning platforms (Chien Wei CWB-450-CNC) with aluminum-specific high-helix carbide tooling and through-spindle coolant. Material certifications (mill certs) are retained for every lot, and heat/lot traceability is included on Certificates of Conformance for aerospace and defense customers. CMM inspection on our Haas HMM 430 supports AS9102 first article inspection packages — see our [CMM inspection services](/cmm-inspection-services) page. ## Frequently Asked Questions Is 7075 worth the extra cost over 6061? Only when the load case or weight target requires it. For strength-driven aerospace and defense parts, the 80%+ strength gain justifies the 2–3× material premium because it lets the design thin-wall further. For general structural, fluid-handling, or anodized cosmetic parts, 6061-T6 is the correct default. Can 7075 be anodized? Yes — typically Type III (hard-coat) for tooling and military hardware. Type II decorative anodize on 7075 produces a darker, less uniform color than on 6061 due to the copper content, so it is not preferred for cosmetic parts. What about 2024 aluminum? 2024-T3 is a copper-alloy aluminum with strength between 6061 and 7075 (~68 ksi tensile) and good fatigue performance — common in aircraft skin panels. It shares 7075's corrosion limitations and is not weldable. Ask us if 2024 is the right choice for your part. ## Need a Quote on 6061 or 7075 Parts? Send drawings and we'll return a quote with material recommendation, lead time, and tolerance review. [Start a Quote](/#submission) ## Related - • [All Materials Machined](/materials-machined) - • [Titanium CNC Machining](/materials/titanium-cnc-machining) - • [PEEK CNC Machining](/materials/peek-cnc-machining) - • [CNC Milling Services](/cnc-milling) - • [CNC Turning Services](/cnc-turning) - • [Aerospace & Defense Machining](/industries/aerospace-defense) - • [Precision CNC Machining](/precision-cnc-machining) Last reviewed: May 12, 2026 [CNC Milling](/cnc-milling) [CNC Turning](/cnc-turning) [Quality Assurance](/quality-assurance) [Prototype to Production](/prototype-to-production) [Industries Served](/industries-served) [Materials Machined](/materials-machined) [Robotics & Automation Machining](/robotics-automation-machining) [Precision CNC Machining](/precision-cnc-machining) [Careers](/careers) [ITAR CNC Machining for Mid-Atlantic Aerospace OEMs](/itar-cnc-machining-mid-atlantic-aerospace) [CNC Tolerances & GD&T Guide](/resources/cnc-machining-tolerances-gdt-guide) [Reducing CNC Machining Costs](/resources/reducing-cnc-machining-costs) [6061 vs 7075 Aluminum](/materials/6061-vs-7075-aluminum) [Brass vs Bronze Machining](/materials/brass-vs-bronze-machining) [![Olympus Machining LLC logo — CNC machining shop Hanover, PA](/assets/olympus-logo-DbWcTX06.webp)](/) Olympus Machining LLC is a precision CNC machining shop in Hanover, Pennsylvania, providing CNC milling and turning services for OEMs and manufacturers nationwide. Olympus Machining LLC · 639 Frederick St, Suite 1 · Hanover, PA 17331 · [(717) 634-5094](tel:+17176345094) Explore all [areas served, industries, and capabilities →](/sitemap) © 2026 All rights reserved.[Admin](/auth) [Compliance & Cybersecurity](/compliance)[Privacy Policy](/privacy-policy)[Sitemap](/sitemap) ITAR-aligned internal controls. Cybersecurity practices aligned with CMMC Level 1 (FAR 52.204-21). [Call (717) 634-5094 ](tel:+17176345094)