“Aircraft aluminum” is one of the most over-used phrases in optic-mount sourcing. For distributors and OEM/ODM partners building a line of precision optic accessories, the phrase hides a real decision: which aluminum grade, and at what cost. The two grades that matter for tactical mounting systems are 6061-T6 and 7075-T6. This guide gives procurement-ready numbers so your team can name the exact alloy on every bill of materials instead of trusting a vague “aircraft aluminum” claim.
Why Alloy Grade Outranks the Word “Aluminum”
Aluminum is a family, not a specification. Two mounts can both be “aluminum” and sit at opposite ends of the strength and price ladder. For outdoor optics that must hold zero through repeated recoil and field handling, the temper and grade decide whether a mount is a value part or a liability. Specifying the grade is the first step in building a coherent, defensible product tier.
6061-T6 — The Mainstream Workhorse
6061-T6 is the default for the majority of commercial scope rings and mounts. Its typical tensile strength sits near 276 MPa (40 ksi), with good corrosion resistance and excellent machinability. It anodizes cleanly, welds reasonably, and costs noticeably less than the high-strength grade. For general-purpose 3–9x lines and light shooting sports equipment, 6061-T6 delivers the strength margin most SKUs ever need while keeping the landed cost competitive.
7075-T6 — The High-Stress Tier
7075-T6 roughly doubles the tensile strength to about 572 MPa (83 ksi) and resists deformation under heavy, repeated load. It is the right call for one-piece mounts, QD repeatable-zero platforms, and any assembly that sees hard use on high-magnification or heavy-tube optics. The trade-offs are cost and slightly poorer corrosion resistance, both of which are manageable with proper anodizing and finishing. See our steel vs aluminum comparison for where a third material enters the decision.
Side-by-Side for the Sourcing Sheet
| Property | 6061-T6 | 7075-T6 |
|---|---|---|
| Tensile strength (approx.) | 276 MPa / 40 ksi | 572 MPa / 83 ksi |
| Machinability | Excellent | Good |
| Corrosion resistance | Very good | Good (needs finish) |
| Relative cost | Lower | Higher |
| Best fit | General-purpose lines | One-piece / QD / heavy-use |
How to Spec the Grade on a Bill of Materials
Ask suppliers to write the exact grade and temper on the BOM — “6061-T6” or “7075-T6” — never just “aluminum.” Pair the choice with a torque plan from our scope mount torque specification guide and a ring-height check against our scope ring height and return-to-zero guide. When you mix grades across a line, keep the logic transparent: reserve 7075-T6 for the parts that carry the real load, and use 6061-T6 everywhere else to protect margin.
Common Sourcing Mistakes
The first mistake is accepting “aircraft aluminum” with no grade named — you cannot verify what you did not specify. The second is over-specifying 7075-T6 on every SKU, which inflates cost with no performance gain on light parts. A third is forgetting finish: 7075-T6 needs a sound anodized layer, or its weaker corrosion resistance becomes a field failure. Our carbon-fiber vs aircraft-aluminum guide and one-piece vs two-piece mount guide cover the wider material and structure choices.
A B2B Procurement Checklist
- Write the exact grade and temper (6061-T6 / 7075-T6) on every BOM line.
- Match the grade to the load path — 7075-T6 for one-piece and QD parts, 6061-T6 elsewhere.
- Specify anodizing class and thickness so corrosion resistance is locked in.
- Request mill certificates or a material declaration for the high-stress tier.
- Confirm the grade against the torque and ring-height plan before locking the catalog.
Talk to Our Sourcing Team
KRS supplies OEM/ODM precision optic accessories and tactical mounting systems to distributors in 30+ countries. Send your alloy-grade and finishing requirements and we will return a matched specification sheet.
WhatsApp: +86 183 0007 6352 | Request a quote: Start an RFQ