Boeing BMS Specification 7075-T7352 Aluminum Aluminum Forgings

BMS 7-186

7075-T7352 Aluminum Alloy – Boeing Specification Forgings

Aluminum Alloy Forgings (7075-T7352)
Block & Die Forgings (7075 only) | DIE BLOCK 2014 Alum Stock | Block or Die Forging

AS9100D / ISO 9001

Mill Test Reports

2–4 Week Delivery

877-237-6822

Quick Specification Facts

Spec Number BMS 7-186

Material 7075-T7352 Aluminum Alloy

Spec Type BMS (Boeing Material Specification)

Category 7075 Aluminum Alloy / Aluminum Forgings

Composition Zn-Mg-Cu Aluminum Alloy

Condition T7352 (Solution Heat Treated, Stress Relieved, Overaged)

Product Forms Block Forgings, Die Forgings

Certification AS9100D / ISO 9001 with full MTR traceability

Specification Overview

BMS 7-186 is a Boeing Material Specification covering aluminum alloy forgings in the 7075-T7352 temper condition. This specification defines requirements for block and die forgings produced from 7075 aluminum alloy, as well as die block stock from 2014 aluminum alloy. It is widely used throughout Boeing commercial and defense aircraft programs for high-strength structural forgings requiring excellent fatigue life and stress corrosion resistance.

The 7075 aluminum alloy is one of the highest-strength aluminum alloys available, with its Zn-Mg-Cu composition delivering outstanding mechanical performance. The T7352 temper—solution heat treated, stress relieved by controlled stretching, and then artificially overaged—provides superior resistance to stress corrosion cracking compared to the T6 temper, making BMS 7-186 forgings ideal for demanding aerospace structural applications where both strength and corrosion resistance are critical.

Available Product Forms

Block Forgings

Die Forgings

Die Block Stock

All product forms are supplied in the T7352 condition per BMS 7-186 requirements. The specification covers block and die forgings from 7075 aluminum alloy, and die block stock from 2014 aluminum alloy. Custom sizes, rough machined, and pre-machined forms are available upon request. Contact our materials specialists for non-standard dimensions and quantities.

Nominal Chemical Composition – 7075 Aluminum Alloy

Element	Symbol	Range %	Notes
Zinc	Zn	5.1–6.1%	Primary strengthening element
Magnesium	Mg	2.1–2.9%	Strength and hardness contributor
Copper	Cu	1.2–2.0%	Enhances strength and fatigue resistance
Chromium	Cr	0.18–0.28%	Improves stress corrosion resistance
Iron	Fe	0.50% max	Controlled impurity
Silicon	Si	0.40% max	Controlled impurity
Manganese	Mn	0.30% max	Controlled impurity
Aluminum	Al	Balance	Base metal

Chemical composition ranges are nominal for 7075 aluminum alloy. Consult the current issue of BMS 7-186 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 7-186
Issuing Organization	The Boeing Company (Boeing Material Specification)
Material Type	Aluminum Alloy Forgings
Alloy Grade	7075 Aluminum Alloy (also 2014 for die block stock)
Temper / Condition	T7352 (Solution Heat Treated, Stress Relieved by Stretching, Overaged)
Available Forms	Block Forgings, Die Forgings (7075); Die Block Stock (2014)
Density	0.102 lb/in³ (2.82 g/cm³)
Tensile Strength (typical)	68,000–73,000 psi (469–503 MPa) – T7352 temper
Yield Strength (typical)	58,000–63,000 psi (400–434 MPa) – T7352 temper
Stress Corrosion Resistance	Excellent – T7352 overaged temper provides superior SCC resistance vs. T6
Machinability	Excellent – rates among the best for aluminum alloys
Certification Available	AS9100D / ISO 9001, Certificate of Conformance, MTR

Typical Applications

Aerospace Structural Components: Airframe bulkheads, wing spars, ribs, fittings, and brackets where high strength-to-weight ratio and stress corrosion resistance are critical requirements.

Defense & Military Aircraft: Structural forgings for military platforms requiring Boeing BMS compliance, including fuselage frames, landing gear components, and weapon system mounts.

Commercial Aviation: Boeing commercial aircraft structural forgings, door surrounds, floor beam fittings, and other high-load structural applications requiring BMS 7-186 certification.

Tooling & Die Blocks: Die block applications requiring precision aluminum forgings with consistent mechanical properties, particularly for aerospace tooling and fixture applications.

Space & Launch Vehicles: High-strength aluminum forged components for launch vehicle structures and spacecraft assemblies where weight savings and material traceability are paramount.

Frequently Asked Questions – BMS 7-186

What is BMS 7-186 and what does it cover?

BMS 7-186 is a Boeing Material Specification covering aluminum alloy forgings, specifically 7075-T7352 aluminum alloy in the form of block and die forgings, as well as die block stock from 2014 aluminum alloy. The T7352 temper designation indicates that the material has been solution heat treated, stress relieved by controlled stretching, and artificially overaged—providing an excellent combination of high strength and superior resistance to stress corrosion cracking. BMS 7-186 is widely used in Boeing commercial and military aircraft structural applications.

What is the difference between 7075-T6 and 7075-T7352 per BMS 7-186?

The primary difference lies in the temper condition and the resulting balance of properties. 7075-T6 is peak-aged to achieve maximum strength, whereas 7075-T7352 (as covered by BMS 7-186) is deliberately overaged beyond peak strength. This overaging reduces tensile and yield strength by approximately 10–15% compared to T6, but dramatically improves resistance to stress corrosion cracking (SCC) and exfoliation corrosion. The T7352 temper also includes stress relieving by controlled stretching, which reduces residual stresses from quenching. For aerospace structural applications where SCC resistance is critical—especially in thick sections—the T7352 temper per BMS 7-186 is strongly preferred.

Does Aero-Vac supply BMS 7-186 material with full mill test reports and certifications?

Yes. All BMS 7-186 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. Electronic delivery of all documentation is available for fast turnaround. If your Boeing program requires additional special process certifications or Boeing-approved source documentation, our quality team can coordinate as needed.

What forms and sizes of BMS 7-186 does Aero-Vac stock?

Aero-Vac maintains inventory of BMS 7-186 material including 7075-T7352 block forgings and die forgings in a variety of sizes. We carry standard stock and can provide custom-cut pieces, rough-machined blanks, and precision-sawed sections from our in-house processing facility at the Port of Kalama. For non-standard dimensions or large quantity requirements, our team can source from our global supplier network. Contact us with your specific size, weight, and configuration requirements and we will provide a prompt quote with availability and lead time.

What are the typical lead times for BMS 7-186 material?

In-stock BMS 7-186 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 forgings or items requiring mill production may require 4–8 weeks depending on quantity, size, and configuration. We prioritize urgent aerospace and defense requirements and will always provide honest, upfront delivery estimates. Rush processing is available on select items. Contact us to discuss your specific timeline.

Can Aero-Vac provide value-added processing for BMS 7-186 material?

Yes. Aero-Vac operates a complete in-house processing facility at our Port of Kalama location. For BMS 7-186 aluminum forgings, we offer precision saw cutting (including disc and block cutting), surface grinding, trepanning, turning, milling, and heat treatment services. We also provide comprehensive mechanical and non-destructive testing in-house. Having all capabilities under one roof allows for faster turnaround, tighter quality control, and reduced overall cost compared to using multiple vendors. Contact us to discuss your specific processing and machining requirements for BMS 7-186 material.

Need BMS 7-186 material or a custom quote?

Our aluminum forging specialists can provide fast pricing, availability, and technical guidance for your BMS 7-186 requirements.