5083 5383 Marine Grade Aluminium Hex Bar

Haomei Aluminum manufactures and supplies 5083 Marine Grade Aluminium Hex Bar and 5383 Marine Grade Aluminium Hex Bar for marine, offshore, transportation and industrial applications where corrosion resistance, weldability and reliable strength are required.

Made from non-heat-treatable Al-Mg alloys, 5083 and 5383 aluminium hex bars perform particularly well in saltwater, humid coastal environments and demanding structural service conditions. Compared with many conventional aluminium grades, these marine alloys offer excellent resistance to seawater corrosion while maintaining good fabrication and welding characteristics.

Our aluminium hex bars can be supplied in standard or customer-specified across-flat dimensions, lengths, tempers and surface conditions. Whether you need material for machined fittings, marine fasteners, hydraulic components, structural connectors or offshore equipment, Haomei Aluminum can provide a solution matched to your project requirements.

Haomei Aluminum is committed to providing high-quality aluminum materials for marine engineering, shipbuilding, and marine equipment. Our products feature stable performance and reliable quality, and have obtained certifications from multiple internationally recognized classification societies, ensuring the trust and recognition of customers worldwide.

We have been certified by the following international classification societies:

DNV (Det Norske Veritas)
CCS (China Classification Society)
ABS (American Bureau of Shipping)
BV (Bureau Veritas)
LR (Lloyd’s Register)
KR (Korean Register of Shipping)

5083 & 5383 Aluminium Hex Bar Specifications

Haomei Aluminum supplies extruded 5083 and 5383 aluminium hex bars for marine, transportation, machinery and fabricated-component applications. Bars can be produced to customer drawings, agreed technical specifications and project delivery requirements.

Alloy 5083 or 5383 aluminium alloy

Product Form Extruded aluminium hex bar

Available Temper O, H111, H112, H116, H321, or temper specified by the customer

Hex Size Custom across-flats dimensions, subject to extrusion feasibility and order requirements

Length Mill lengths, fixed lengths or precision cut-to-length service

Surface Condition Mill finish, brushed, polished, machined, or other agreed surface finish

Dimensional Tolerance Standard extrusion tolerance or tolerances defined in the purchase order or drawing

Packaging Protective film, kraft paper, export wooden pallets, or seaworthy packing as required

Ordering Information To confirm production suitability and quotation details, please provide the required alloy, temper, across-flats size, length, quantity, tolerance, surface requirement and applicable drawing or technical standard.

Looking for other extruded shapes? View our aluminium extrusion profiles for round, square, rectangular and custom profile options.

5083 Marine Grade Aluminium Hex Bar

5083 aluminium hex bar is one of the most widely used high-magnesium marine aluminium products. It is known for its strong resistance to seawater and industrial chemical environments, making it a preferred material for shipbuilding, offshore structures and corrosion-resistant mechanical parts.

5083 does not rely on heat treatment for strength. Instead, its mechanical properties are achieved through alloy composition and strain hardening. This makes it suitable for applications requiring dependable performance after forming or welding.

Key Benefits of 5083 Aluminium Hex Bar

Excellent corrosion resistance in seawater environments
High strength among non-heat-treatable aluminium alloys
Good weldability with appropriate filler metals
Suitable for machining, cutting and fabrication
Lower weight than steel for easier handling and assembly
Reliable performance in marine and industrial environments

Typical applications include marine hardware, vessel components, deck fittings, structural joints, offshore machinery parts, brackets, manifolds and corrosion-resistant machined components.

For plate and sheet requirements, see our 5083 marine aluminium plate range.

5383 Marine Grade Aluminium Hex Bar

5383 Marine Grade Aluminium Hex Bar is a high-strength aluminium-magnesium alloy developed for demanding marine and transportation applications. It is closely related to 5083 but is designed to provide enhanced strength potential while retaining the corrosion resistance and weldability expected from marine-grade aluminium.

5383 is often specified for projects that require improved structural performance, especially where weight reduction and long-term exposure to harsh environments are both important. It is commonly considered for marine structures, transportation equipment, offshore engineering and high-performance fabricated parts.

Why Choose 5383 Aluminium Hex Bar?

High strength-to-weight ratio
Excellent resistance to marine atmospheric and seawater corrosion
Good welding performance for fabricated assemblies
Suitable for lightweight structural and machined components
Available in custom hexagonal dimensions and cut lengths
Practical choice for demanding offshore and transport applications

Haomei Aluminum can assist customers in selecting between 5083 and 5383 based on service environment, machining requirements, welding process, dimensional tolerance and required mechanical properties.

Dimensional Tolerances of 5083 5383 Aluminum Hexagon Bar

Across Flats Tolerance

For hex bars with across flats ≤ 50mm, the standard tolerance is ±0.50mm, while the precision grade tolerance can reach ±0.40mm.
For hex bars with across flats in the range of 50–220mm, the tolerance increases with size.

Length Tolerance

For hex bars with a length ≤ 6m, the length tolerance is ±5mm.
When the length > 6m, the tolerance increases by ±1mm for each additional meter, but does not exceed ±20mm in total.

5083 vs. 5383 Marine Grade Aluminium Hex Bar

Property	5083 Aluminium Hex Bar	5383 Aluminium Hex Bar
Alloy Family	Al-Mg marine alloy	Al-Mg marine alloy
Corrosion Resistance	Excellent, especially in seawater	Excellent, suitable for marine environments
Strength Level	High	Generally selected where higher strength potential is needed
Weldability	Very good	Very good
Typical Applications	Shipbuilding, marine fittings, offshore parts	Marine structures, transport equipment, high-strength fabricated parts
Heat Treatability	Non-heat-treatable	Non-heat-treatable

The final alloy selection should be based on the part design, required temper, operating environment, welding process and applicable project specification. Haomei Aluminum can provide material recommendations before production or procurement.

General Marine Environment: For standard ship structures and marine applications, 5083-H116 aluminum hex bars are a cost-effective choice.
Harsh Marine Environment: For deep-sea environments, high salinity areas, or structures submerged in seawater for long periods, 5383-H116 aluminum hex bars are recommended.
Low-Temperature Environment: In low-temperature conditions (e.g., LNG storage tanks), both alloys perform well, but 5083 offers slightly better low-temperature toughness.
High Lightweight Requirements: For applications with strict weight limitations, 5383 aluminum hex bars offer an advantage due to their higher strength-to-weight ratio.

Chemical composition of marine grade 5083 5383 aluminum hexagon bar

Elements	Composition / %
Elements	5083	5383
Si	0-0.4	0-0.25
Fe	0-0.4	0-0.25
Cu	0-0.1	0-0.2
Mn	0.40-1.00	0.70-1.00
Mg	4.00-4.90	4.0-5.20
Cr	0.05-0.25	0-0.25
Zr	-	0-0.2
Zn	0-0.25	0-0.4
Ti	0-0.15	0-0.15
Al	Remainder	Remainder

Mechanical properties of marine grade 5083 5383 aluminum hex bar

Alloy	Temper	Inscribed circle diameter /mm	Tensile strength /(N/mm2)	Specified non-proportional tensile strength /(N/mm2)	Elongation after break /%
					A	A50 mm
			not less than
5083	O	≤12.50	270-350	110	-	14
		>12.50-200.00	270		12	-
	H112	≤12.50	270	125	-	12
		>12.50-200.00			12	-
5383	O	≤12.50	290	145	-	17
		>12.50-50.00			17	-
	H112	≤12.50	310	190	-	13
		>12.50-50.00			13	-

Applications of Marine Grade Aluminium Hex Bar

Thanks to their corrosion resistance and mechanical performance, 5083 and 5383 aluminium hex bars are used across a wide range of industries.

Marine and Shipbuilding

Marine fittings and connectors
Deck hardware
Ship structural accessories
Boat equipment components
Marine pumps and valve parts
Seawater handling systems

Offshore Engineering

Offshore platform accessories
Corrosion-resistant brackets
Structural fasteners and connectors
Hydraulic system components
Equipment housings and support parts

Transportation

Rail vehicle components
Truck and trailer fittings
Lightweight structural hardware
Corrosion-resistant mechanical parts

Industrial Fabrication

Machined hex fittings
Fluid-control components
Instrumentation parts
Chemical-processing equipment
High-strength connectors and custom fasteners

If your project also requires corrosion-resistant sheet products, Haomei Aluminum offers marine grade aluminium sheets and plates in several commonly used alloys.

Manufacturing Quality Control for 5083 & 5383 Marine Aluminum Hex Bars

Haomei Aluminum supplies 5083 and 5383 marine-grade aluminum hex bars with controlled alloy composition, consistent dimensions and reliable production traceability. Our manufacturing and inspection procedures are designed to support marine, offshore, shipbuilding and other demanding engineering applications.

From raw material selection to final packing, each order can be checked against the agreed technical requirements, including alloy grade, temper, across-flat size, straightness, tolerance, testing standard and documentation requirements.

Verification of raw materials and chemical composition
Controlled extrusion process for stable hex bar dimensions
Inspection of across-flat size, length, straightness and tolerances
Visual inspection for surface condition and workmanship
Mechanical property testing based on the requested temper or specification
Ultrasonic testing and other non-destructive testing when specified
Material Test Certificates (MTC) available upon request
Traceable identification and customized export packing
Protective packaging suitable for sea freight and long-distance transportation

Marine aluminum hex bars are frequently used in corrosion-sensitive, structural and long-service environments. To ensure the material is suitable for the intended application, please confirm the required alloy, temper, hex bar size, dimensional tolerance, applicable standard, inspection method and certification requirements before placing an order.

Custom 5083 and 5383 Aluminium Hex Bar Service

Not every marine component can use a standard-size bar. Haomei Aluminum provides customized supply options for customers needing special hexagonal dimensions, short cut pieces, long-length bars or project-specific tolerances.

Our custom service may include:

Non-standard hex bar sizes
Cut-to-length service
Small-batch and bulk supply options
Customized tolerances
Surface treatment coordination
Material marking and export packaging
Technical support for alloy and temper selection

Information Required for a Quotation

To receive a quotation, please provide the following information:

Alloy required: 5083 or 5383
Temper required
Hex bar across-flat size
Length and quantity
Tolerance requirement
Application or service environment
Required standard and certification

Why Purchase Marine Aluminium Hex Bar from Haomei Aluminum?

Choosing Haomei Aluminum means working directly with the source factory and receiving aluminium material produced under controlled manufacturing processes.

100% Melt and Batch Traceability Every batch of 5083 and 5383 aluminium hex bar is controlled from aluminium ingot melting through production. Material Test Certificates (MTCs) can be supplied with shipments, showing chemical composition test results.
Accurate Dimensional Tolerances Our extrusion and drawing processes are designed to control across-flat size tolerances. For CNC automatic feeding systems, stable bar dimensions can help reduce feeding issues and improve machining efficiency.
Marine Classification Support Materials can be supplied to meet applicable marine certification requirements, including DNV, ABS, CCS, and Lloyd's Register (LR), subject to order requirements and certification arrangements.

Documentation & Certification Support

For projects requiring inspection records, traceability, or shipbuilding approval documentation, our sales and technical teams can help confirm the applicable requirements before production.

MTC Available
DNV Support
ABS Support
CCS Support
LR Support
Custom Cutting

FAQ – 5083 & 5383 Aluminum Hex Bar

Is 5083 aluminium suitable for seawater use?

Yes. 5083 is widely recognized as a marine-grade aluminium alloy because of its excellent resistance to seawater corrosion. It is commonly used in shipbuilding, offshore structures, and coastal engineering applications.

What is the difference between 5083 and 5383 aluminium hex bar?

Both 5083 and 5383 aluminium hex bars are aluminium-magnesium alloys designed for marine and corrosion-resistant applications. 5383 is often selected where higher strength potential is required, while 5083 remains a well-established choice for marine fabrication and shipbuilding. The best option depends on the application, temper, and project specifications.

Can 5083 and 5383 aluminium hex bars be welded?

Yes. Both alloys offer good weldability when suitable welding procedures and filler materials are used. Welding requirements should be evaluated based on joint design, material temper, and applicable engineering standards.

Can Haomei Aluminum provide cut-to-length hex bars?

Yes. Haomei Aluminum can supply standard lengths or cut 5083 and 5383 aluminium hex bars to customer-specified lengths, subject to size, quantity, and tolerance requirements.

Do you provide material certificates for aluminium hex bars?

Yes. Material test certificates can be supplied according to order requirements. Customers can confirm required standards, inspection items, and certificate types when sending inquiries.

Can 5383 aluminium hex bar completely replace 5083?

In many marine applications, 5383 can be an alternative to 5083. It maintains the excellent corrosion resistance characteristics associated with 5083 while offering higher yield strength. Final alloy selection should be based on component design, working environment, certification requirements, and engineering evaluation.

Can Haomei Aluminum provide pre-cut short aluminium hex bar lengths?

Yes. Haomei Aluminum provides custom cutting services using automated sawing equipment. Long hex bars can be cut and packed to specified lengths according to CNC loading requirements, helping reduce preparation time before machining.

What information is needed to request a quote for aluminium hex bar?

Please provide the required alloy grade (5083 or 5383), temper, across-flat size, required length or cutting length, quantity, destination port or delivery location, and any certification or inspection requirements. Our team can prepare an EXW or FOB factory quotation based on your project needs.

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