Boeing Specification 7150 Aluminum Alloy Aluminum Alloy

BMS 7-306

7150 Aluminum Alloy – Extruded Bar, Rod and Shapes (QPL)

Boeing Material Specification – 7150 Aluminum Alloy, Extruded Bar, Rod and Shapes (QPL) – High-Strength Aerospace Aluminum per BMS-7-306

AS9100D / ISO 9001

Mill Test Reports

2–4 Week Delivery

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Quick Specification Facts

Spec Number BMS-7-306

Material 7150 Aluminum Alloy

Spec Type Boeing Material Specification (BMS)

Category Aluminum / 7150

Composition Al-Zn-Mg-Cu (Zn 5.9–6.9%, Mg 2.0–2.7%, Cu 1.9–2.5%)

Also Known As 7150-T6151, 7150-T61511, 7150-T6511

Product Forms Extruded Bar, Rod and Shapes

QPL Qualified Products List (QPL) required

Certification AS9100D / ISO 9001 with full MTR traceability

Specification Overview

BMS-7-306 is a Boeing Material Specification covering 7150 Aluminum Alloy in the form of extruded bar, rod, and shapes. This specification requires qualification to a Boeing Qualified Products List (QPL), ensuring that only approved producers and product forms are supplied to Boeing programs. 7150 is a high-strength aluminum alloy in the 7xxx series (Al-Zn-Mg-Cu system), designed for demanding aerospace structural applications where a combination of high strength, good corrosion resistance, and excellent fatigue performance is required.

The 7150 alloy is commonly supplied in the T6151, T61511, and T6511 tempers, which are stretch-stress-relieved conditions offering improved dimensional stability and reduced residual stress. The alloy's nominal composition—featuring zinc (5.9–6.9%), magnesium (2.0–2.7%), copper (1.9–2.5%), and a zirconium addition (0.08–0.15%) in place of chromium—provides outstanding strength-to-weight ratio and resistance to stress-corrosion cracking. BMS-7-306 extruded products are widely used in commercial and military aircraft primary structures, including wing stringers, fuselage frames, and other critical load-bearing components.

Available Product Forms

Extruded Bar

Extruded Rod

Extruded Shapes

BMS-7-306 material is supplied as Extruded Bar, Rod, and Shapes per specification requirements. Round bar, rectangular bar, and structural extrusion profiles are available in a range of sizes and cross-sections. QPL-approved product forms and tempers are maintained to ensure full specification compliance. Contact our materials specialists for non-standard dimensions or custom extrusion requirements.

Nominal Chemical Composition

Element	Symbol	Nominal %	Notes
Zinc	Zn	5.9–6.9%	Primary strengthening element; controls precipitation hardening response
Magnesium	Mg	2.0–2.7%	Forms MgZn2 precipitates; contributes to high strength
Copper	Cu	1.9–2.5%	Enhances strength and improves resistance to stress-corrosion cracking
Zirconium	Zr	0.08–0.15%	Grain refiner; replaces chromium; improves fracture toughness and SCC resistance
Manganese	Mn	0.10% max	Controlled to low levels in 7150
Silicon	Si	0.12% max	Controlled impurity; low levels maintained for toughness
Iron	Fe	0.15% max	Controlled impurity; low levels maintained for improved toughness
Titanium	Ti	0.06% max	Grain refining addition
Aluminum	Al	Balance	Base metal

Chemical composition ranges are nominal. Consult the current issue of BMS-7-306 for precise minimum/maximum requirements. Aero-Vac provides full mill test reports (MTRs) with certified chemistry for every order.

Key Properties & Specification Details

Property / Attribute	Details
Specification Number	BMS-7-306
Issuing Organization	Boeing Commercial Airplanes (Boeing Material Specification)
Material Type	7150 Aluminum Alloy – Extruded Bar, Rod and Shapes
Alloy Series	7xxx Series (Al-Zn-Mg-Cu)
QPL Required	Yes – Qualified Products List (QPL) approved sources required
Common Tempers	T6151, T61511, T6511 (stretch-stress relieved)
Nominal Composition	Zn 5.9–6.9%, Mg 2.0–2.7%, Cu 1.9–2.5%, Zr 0.08–0.15%, Al balance
Available Forms	Extruded Bar, Rod and Shapes
Tensile Strength	Very High – among the highest strength aluminum alloys; designed for primary aerospace structural applications
Fracture Toughness	Good – improved over 7075 due to zirconium addition and controlled composition
Corrosion Resistance	Good – improved SCC resistance compared to 7075 due to Cu content and zirconium grain refining
Machinability	Good – machines well using standard aluminum machining practices
Density	~2.83 g/cm³ (0.102 lb/in³)
Certification Available	AS9100D / ISO 9001, Certificate of Conformance, MTR

Typical Applications

Aerospace Primary Structures: Wing stringers, fuselage frames, longerons, and other primary load-bearing structural components on commercial and military aircraft requiring high strength-to-weight ratio.

Commercial Aircraft Airframes: Boeing commercial aircraft programs rely on BMS-7-306 qualified 7150 extrusions for critical structural members, particularly in wing and fuselage primary structure where weight savings and high mechanical performance are paramount.

Structural Extrusions & Profiles: Complex extruded shapes, T-sections, Z-sections, and hat sections used as structural stiffeners, frames, and ribs in aerospace assemblies.

Defense & Military Aircraft: High-strength aluminum structural members for military aircraft, rotorcraft, and defense system airframes where lightweight, high-strength materials with good fatigue and corrosion performance are required.

Machined Structural Components: Bar and rod stock for precision machined brackets, fittings, and structural details in aerospace assemblies requiring tight dimensional tolerances and certified material properties.

Frequently Asked Questions – BMS-7-306

What is BMS-7-306 and what does it cover?

BMS-7-306 is a Boeing Material Specification covering 7150 Aluminum Alloy in the form of extruded bar, rod, and shapes. The specification requires that material be sourced from a Boeing Qualified Products List (QPL) approved producer, ensuring consistent quality and compliance for Boeing commercial and defense programs. 7150 is a high-strength Al-Zn-Mg-Cu aluminum alloy featuring a zirconium addition for grain refinement and improved fracture toughness. Common tempers covered include T6151, T61511, and T6511, all of which are stretch-stress-relieved conditions. BMS-7-306 extruded products are used extensively in primary aircraft structures where high strength-to-weight ratio and reliable fatigue performance are required.

What is 7150 aluminum alloy and what makes it unique?

7150 is a high-strength aluminum alloy in the 7xxx series (Al-Zn-Mg-Cu system) developed specifically for demanding aerospace structural applications. Unlike the widely used 7075 alloy, 7150 incorporates a zirconium addition (0.08–0.15%) in place of chromium, which provides finer grain structure, improved fracture toughness, and better resistance to stress-corrosion cracking (SCC). The combination of zinc (5.9–6.9%), magnesium (2.0–2.7%), and copper (1.9–2.5%) provides very high strength levels through precipitation hardening, while the controlled composition and zirconium grain refining result in improved toughness compared to earlier 7xxx alloys. 7150 is typically supplied in stretch-stress-relieved tempers (T6151, T61511, T6511) which reduce residual stresses and improve dimensional stability during machining. This alloy is widely used by Boeing for wing stringers and other primary structural extrusions.

Does Aero-Vac supply BMS-7-306 material with full mill test reports and certifications?

Yes. All BMS-7-306 material supplied by Aero-Vac is fully traceable to mill test reports (MTRs) confirming chemical composition and mechanical properties per the specification. We are AS9100D/ISO 9001 certified with a 99.6% quality rating. Every order ships with certificates of conformance, material certifications, and chemical/mechanical test reports. Material is sourced from QPL-approved producers as required by BMS-7-306. Electronic delivery of all documentation is available for fast turnaround. If your program requires additional Boeing-specific documentation or special process certifications, our quality team can coordinate as needed.

What sizes of BMS-7-306 7150 aluminum bar, rod, and shapes does Aero-Vac stock?

Aero-Vac maintains inventory of BMS-7-306 (7150 aluminum alloy) extruded bar and rod across a range of diameters and sizes. We carry standard bar diameters and rectangular extrusions and can provide custom-cut lengths from our in-house processing facility at the Port of Kalama. Extruded shapes and structural profiles are available through our global supplier network. Contact us with your specific size, temper, quantity, and required documentation and we will provide a prompt quote with availability and lead time.

What are the typical lead times for BMS-7-306 material?

In-stock BMS-7-306 material is typically available for same-day or next-day shipment. For custom-cut or specially processed orders, our standard lead time is 2–4 weeks—significantly faster than the industry average of 8–12 weeks. Specialty shapes, structural extrusions, or items requiring mill production may require 4–8 weeks depending on quantity and dimensions. We prioritize urgent aerospace and defense requirements and will always provide honest, upfront delivery estimates. Rush processing is available on select items. Contact us with your requirement and we will give you a straight answer on availability.

Can Aero-Vac provide value-added processing for BMS-7-306 7150 aluminum material?

Yes. Aero-Vac operates a complete in-house processing facility at our Port of Kalama location. For BMS-7-306 (7150 aluminum) extruded bar, rod, and shapes, we offer precision saw cutting, surface grinding, turning, and milling services. We also provide comprehensive mechanical and non-destructive testing services in-house. Having all capabilities under one roof allows for faster turnaround, tighter quality control, and reduced overall cost compared to using multiple vendors. Our team is experienced with the specific machining requirements of high-strength 7xxx series aluminum alloys. Contact us to discuss your specific processing and testing requirements for BMS-7-306 material.

Need BMS-7-306 material or a custom quote?

Our aluminum specialists can provide fast pricing, availability, and technical guidance for your BMS-7-306 / 7150 Aluminum Alloy requirements.