O (annealed)
Softest condition, used for heading complex shapes. Parts are solution treated and aged after forming to reach T6.
Heat-treatable rivet and fastener alloy
6053 T6 Aluminium Automotive Profile, Rod and Wire
6053 is a magnesium-rich 6xxx alloy with chromium, best known as the material for solid and tubular rivets and other cold-headed parts. In vehicles it is used as drawn rod, wire and small extruded sections that are headed, riveted or machined into fasteners and fittings, then aged to T6 or T61. Metline supplies 6053 rod, wire and compact profiles to drawing, with mill certificates, to automotive and transport manufacturers worldwide.
- Alloy
- 6053 (Al-Mg-Si-Cr), UNS A96053
- Tempers
- O, T4, T6, T61
- Forms
- Rod, wire, small extruded sections
- Standard
- ASTM B316 (rivet and cold-heading wire)
What is 6053 aluminium, and where does it fit in a vehicle?
6053 belongs to the same Al-Mg-Si family as 6061, but its chemistry is tuned for cold working rather than for maximum strength. Magnesium is higher (1.1 – 1.4 %), silicon is balanced against the magnesium, and iron is held lower than in 6061. The cleaner, more ductile structure lets wire and rod be upset into rivet heads and fastener shapes without cracking, then heat-treated to useful strength.
That makes 6053 a component alloy rather than a body-structure alloy. In the automotive and wider transport sector it appears where aluminium parts are riveted or headed: solid rivets in bus, coach and truck bodies, tubular rivets in trim and interior assemblies, cold-headed pins and studs, and small turned fittings. Using an aluminium rivet in an aluminium structure also avoids the galvanic couple created by steel or copper fasteners.
For large load-bearing extrusions such as crash rails, sills and battery-tray frames, engineers normally specify 6061, 6082 or 6005A, which are designed for heavy extrusion and offer higher guaranteed strength in thick sections. This page explains where 6053 is the right choice and where another alloy will serve better.
6053 chemical composition (wt %)
6053 is unusual in that its silicon limit is defined as a proportion of the magnesium actually present. This keeps the two elements close to the balanced ratio for Mg2Si, which favours ductility in cold heading. Some published tables garble this rule into an impossible percentage; the correct registered limits are below.
| Element | Limit | Comment |
|---|---|---|
| Silicon (Si) | 45 – 65 % of the Mg content | For example 0.50 – 0.72 % Si when Mg is 1.1 % |
| Iron (Fe) | 0.35 max | Lower than 6061 (0.70) for better formability |
| Copper (Cu) | 0.10 max | Kept low for corrosion resistance |
| Magnesium (Mg) | 1.1 – 1.4 | Main strengthening element |
| Chromium (Cr) | 0.15 – 0.35 | Controls grain structure and recrystallisation |
| Zinc (Zn) | 0.10 max | |
| Others, each / total | 0.05 / 0.15 | |
| Aluminium (Al) | Remainder |
Limits from the Aluminum Association registration for 6053 (UNS A96053). Every lot is certified with its actual analysis.
Mechanical and physical properties
Published data for 6053 are mainly for wire and rod. The figures below are typical values from standard handbooks; specified minimums for rivet wire are set by ASTM B316 and depend on diameter and temper. Some trade literature quotes 6053-T6 at 280 – 340 MPa tensile, which is higher than the published typical data and should not be used for design.
| Temper | Tensile strength (typical) | Yield strength (typical) | Elongation | Shear strength |
|---|---|---|---|---|
| O (annealed) | about 110 MPa | about 55 MPa | about 35 % | about 76 MPa |
| T61 (rivet wire) | about 205 MPa | — | about 12 % | about 135 MPa |
| T6 | about 255 MPa | about 220 MPa | about 13 % | about 165 MPa |
Physical properties (typical)
- Density
- 2.69 g/cm³
- Modulus of elasticity
- about 69 GPa
- Thermal conductivity
- about 160 – 170 W/m·K (T6)
- Electrical conductivity
- about 42 – 45 % IACS (T6)
- Coefficient of thermal expansion
- about 23 µm/m·°C (20 – 100 °C)
- Melting range
- about 575 – 650 °C
Choosing the right 6053 temper
T4
Solution treated and naturally aged. Rivets are sometimes driven in this condition and age further in service, or are aged after installation.
T61
The usual condition for rivet wire to ASTM B316: solution treated and artificially aged to a strength that still allows the rivet to be driven.
T6
Full artificial ageing for maximum strength in machined or headed fittings that are not upset after heat treatment.
If you are replacing a steel rivet or fastener, check the required shear load carefully. Aluminium rivets have a fraction of the shear strength of steel, so the joint usually needs more or larger rivets.
Forms and sizes we supply
Typical 6053 supply range
- Wire
- Drawn wire in coils for rivet and cold-heading machines, about 1.5 – 10 mm diameter
- Rod and bar
- Drawn or extruded rod about 6 – 50 mm diameter, straight lengths
- Small profiles
- Compact extruded sections and tubes to drawing, for fittings and tubular rivet stock
- Tempers
- O, H13-type drawn, T4, T6, T61
- Surface
- Bright drawn, lubricated for heading, or clean and dry for machining
- Tolerances
- Diameter tolerance per ASTM B316 or tighter by agreement for automatic heading
Large structural extrusions are normally made in 6061, 6082 or 6005A; ask us for a recommendation if you are unsure.
Standards and designations
| System | Designation / standard | Comment |
|---|---|---|
| Aluminum Association | 6053 | Registered wrought alloy |
| UNS | A96053 | |
| ASTM | B316 / B316M | Aluminium and aluminium-alloy rivet and cold-heading wire and rods |
| Temper designations | ANSI H35.1 / EN 515 | Definitions of O, T4, T6, T61 |
| Quality system | IATF 16949 at the part maker | Automotive fastener makers usually require PPAP-style documentation |
6053 is not widely registered in European or Japanese wrought standards. For EN-based projects, 6082 or 6061 rivet stock is sometimes substituted; agree the alternative with the design authority first.
Heading, riveting, machining and finishing
- Cold heading: head in O or T4 condition with a light lubricant; upset ratios are good, but very deep upsets should be trialled before production
- Riveting: drive rivets promptly after solution treatment, or use T61 stock within the driving range given by the rivet standard
- Machining: machines well in T6; use sharp, polished tools to avoid built-up edge on the softer tempers
- Welding: weldable by TIG and MIG with 4043 or 5356 filler, though 6053 is rarely chosen for welded parts
- Anodising: responds well to clear and coloured anodising, useful for visible trim rivets
- Corrosion: low copper gives good resistance in road-salt environments, especially when anodised
Automotive and transport applications
| Application | Typical form | Why 6053 |
|---|---|---|
| Solid rivets in bus, coach and truck bodies | Wire, T61 | Strong, drivable rivets that match aluminium panels galvanically |
| Tubular and semi-tubular rivets for trim and interiors | Wire or tube | Good heading and flaring behaviour |
| Cold-headed pins, studs and spacers | Wire or rod | Formable before ageing, strong after |
| Small machined fittings and connectors | Rod, T6 | Clean machining and good anodising response |
| Trailer and caravan assembly | Rivets and rod | Corrosion-resistant fastening of aluminium skins |
Suspension arms, sub-frames, door frames and roof rails are not typical 6053 parts. Those components use forged 6082 or 6061, or extruded 6061, 6082 and 6005A.
6053 compared with 6061, 2117 and 5056 rivet alloys
| Property | 6053-T61 | 6061-T6 | 2117-T4 | 5056-H32 |
|---|---|---|---|---|
| Shear strength (typical) | about 135 MPa | about 207 MPa | about 195 MPa | about 170 – 185 MPa |
| Heading behaviour | Very good | Good | Very good (drive as received) | Good |
| Corrosion resistance | Good | Good | Fair | Very good |
| Heat treatment | Yes | Yes | Yes | No (cold worked) |
| Typical use | General and trim rivets | Higher-strength rivets and fittings | Aircraft-type solid rivets | Rivets for magnesium and marine parts |
Choose 6053 for general-purpose aluminium rivets where corrosion resistance matters more than maximum shear strength. Move to 6061 rivet wire when you need higher shear load, or to 2117 for aerospace-type solid rivets that are driven as received.
How to order 6053 from Metline
- SpecifyAlloy and temper (e.g. 6053-T61), form (wire, rod or profile), diameter or drawing, coil weight or length, and quantity.
- Confirm the standardASTM B316 for rivet and cold-heading wire, or your own fastener specification with tolerance and surface requirements.
- QuoteWe confirm availability, tolerances, certification and delivery terms (EXW, FOB, CIF or DAP) for your plant or port.
- Process and inspectWire coils and rod bundles are checked for diameter, surface and mechanical properties before packing.
- Document and shipEach lot ships with an EN 10204 3.1 mill test certificate, lot traceability and a packing list, in seaworthy export packing. Third-party inspection can be arranged on request.
References and standards
- The Aluminum Association – International Alloy Designations and Chemical Composition Limits (Teal Sheets)
- ASTM B316 / B316M – Aluminum and Aluminum-Alloy Rivet and Cold-Heading Wire and Rods
- ANSI H35.1 – American National Standard Alloy and Temper Designation Systems for Aluminum
- ASM International – Alloy Digest Al-131: Aluminum 6053
- IATF 16949 – Quality management system requirements for automotive production and relevant service parts organisations
6053 aluminium (aluminum): frequently asked questions
What is 6053 aluminium used for?
Mainly solid and tubular rivets, cold-headed fasteners and small fittings. Its lower iron and balanced Mg-Si chemistry give better cold-heading behaviour than 6061, at slightly lower strength.
Is 6053 suitable for structural automotive extrusions?
It is not the usual choice. Large structural profiles such as crash rails and battery frames are made in 6061, 6082 or 6005A, which are designed for heavy extrusion and have higher guaranteed strength.
Why is the silicon limit for 6053 given as a percentage of magnesium?
The registration ties silicon to 45 – 65 % of the actual magnesium content so the alloy stays close to the balanced Mg2Si ratio. That limits free silicon and helps ductility during cold heading.
What is the difference between 6053-T6 and T61?
Both are solution treated and artificially aged. T61 is aged to a condition suited to rivet wire under ASTM B316, while T6 is aged for maximum strength in parts that will not be upset after heat treatment.
Which standard covers 6053 rivet wire?
ASTM B316 / B316M, the specification for aluminium and aluminium-alloy rivet and cold-heading wire and rods.
Can Metline supply 6053 outside India?
Yes. We ship rod and wire worldwide with mill certificates and export packing on EXW, FOB, CIF or DAP terms.
Need 6053 rivet or heading stock?
Send the diameter, temper, coil or length and quantity. Our team will confirm availability, certification and delivered terms.
