Table of Contents
- 6061 vs 7075 Aluminum Overview
- 6061 Aluminum: The All-Rounder
- 7075 Aluminum: The High-Strength Choice
- Head-to-Head Comparison
- When to Choose Which
- Frequently Asked Questions
- Get Your Quote
Aluminum 6061 and 7075 are the two most popular alloys for CNC machining — but they serve very different purposes. Choosing the wrong grade can lead to either overpaying for unnecessary strength or under-specifying for a demanding application.
6061 Aluminum: The All-Rounder
6061-T6 is the most widely used aluminum alloy for CNC machining. It offers an excellent balance of strength, machinability, weldability, and cost.
Key specs:
- Tensile strength: 310 MPa (45,000 psi)
- Yield strength: 276 MPa (40,000 psi)
- Hardness: 95 Brinell
- Machinability rating: Good
- Corrosion resistance: Excellent
- Weldability: Excellent
- Anodizing quality: Good
Best applications: Structural components, automation brackets, food machinery parts, general mechanical parts
7075 Aluminum: The High-Strength Choice
7075-T6 is an aerospace-grade alloy with zinc as its primary alloying element. It is significantly stronger than 6061 — approaching the strength of some steels.
Key specs:
- Tensile strength: 572 MPa (83,000 psi)
- Yield strength: 503 MPa (73,000 psi)
- Hardness: 150 Brinell
- Machinability rating: Fair (harder on tooling)
- Corrosion resistance: Good (but less than 6061)
- Weldability: Poor
- Anodizing quality: Very good
Best applications: Aerospace components, optical mounts, high-stress mechanical parts, semiconductor equipment
Head-to-Head Comparison
| Property | 6061-T6 | 7075-T6 |
|---|---|---|
| Strength (Tensile) | 310 MPa | 572 MPa |
| Strength (Yield) | 276 MPa | 503 MPa |
| Hardness | 95 HB | 150 HB |
| Machinability | Excellent | Good |
| Weldability | Excellent | Poor |
| Corrosion Resistance | Excellent | Good |
| Cost per kg | $$ | $$$ |
When to Choose Which
Choose 6061 when:
- You need a cost-effective solution for most applications
- Parts will be welded or assembled
- Corrosion resistance is important
Choose 7075 when:
- Maximum strength-to-weight ratio is critical
- The part is under high stress or cyclic loading
- Thin wall sections require high strength material
Frequently Asked Questions
Q: Is 7075 always better than 6061?
A: No. 7075 is stronger but harder to machine, more expensive, and cannot be welded.
Q: Which alloy is better for thin-walled parts?
A: 7075. Its higher strength allows thinner walls while maintaining structural integrity.
Q: Do you stock both alloys?
A: Yes, we maintain inventory of both 6061-T6 and 7075-T6 in various bar, plate, and billet sizes.
Need CNC Machined Aluminum Parts?
Contact us with your design and material requirements. We will recommend the optimal alloy and provide a quote within 24 hours.