Diamond (lentil)
The classic tread pattern with raised diamond-shaped lugs about 1 mm high. Good all-direction grip; the standard for tanker walkways in many markets.
Tanker body components
3003 Aluminium Tread (Checkered) Plate for Oil Tankers
3003 tread plate is the usual choice for the non-pressure parts of road fuel and oil tankers: top walkways, ladder treads, side steps, mudguards and toolbox lids. It gives a slip-resistant raised pattern, resists fuel spills and road salt, and weighs about a third as much as steel checker plate. The tank shell itself is made from stronger 5xxx alloys; this guide covers the tread plate.
- Alloy
- 3003 (EN AW-3003)
- Tempers
- H114, H234, H194
- Base thickness
- about 1.0 – 5 mm
- Patterns
- Diamond, 5-bar, 3-bar, lentil
Where tread plate is used on a tanker
A fuel tanker body combines a welded 5xxx-alloy tank with many secondary parts that the driver walks on, climbs or opens every day. These parts need grip, low weight and corrosion resistance more than high strength.
3003 aluminium tread plate fits that brief. It is an aluminium-manganese alloy with good formability, so it can be bent into steps, mudguard shapes and box lids without cracking, and it welds and rivets easily to the tank's mounting brackets. Because it is non-heat-treatable, welding does not leave a weak, over-aged zone as it can with 6061-T6 tread plate.
Tanker shells for petrol, diesel and chemicals are made from 5083, 5454, 5182 or 5754 sheet to tank-vehicle design codes such as EN 13094 under ADR. The tread plate parts are attached to that shell, so material compatibility matters: 3003 and 5xxx alloys sit close together electrochemically and can be welded together with 5xxx or 4043 filler.
3003 tread plate composition (wt %)
| Element | Limit |
|---|---|
| Manganese (Mn) | 1.0 – 1.5 |
| Copper (Cu) | 0.05 – 0.20 |
| Iron (Fe) | ≤ 0.70 |
| Silicon (Si) | ≤ 0.60 |
| Zinc (Zn) | ≤ 0.10 |
| Others each / total | 0.05 / 0.15 |
| Aluminium | Remainder |
Some suppliers publish a table with 4 – 5 % magnesium for "3003 tread plate"; that is the composition of 5083, not 3003. If your project needs higher strength, order 5052 or 5083 tread plate by name.
Tread plate tempers and mechanical properties
Patterned plate has its own temper codes under ANSI H35.1 and EN 515. The last digit 4 means the pattern was rolled into sheet of the temper indicated by the preceding digits, so H114 is patterned from annealed stock, H234 from H22 stock and H194 from full-hard H18 stock.
| Temper | Base condition | Typical minimum tensile strength | Character |
|---|---|---|---|
| H114 | Patterned from O | about 110 – 120 MPa | Softest; easiest to bend into steps and mudguards |
| H234 | Patterned from H22 | about 120 MPa | Slightly stiffer; good general tread plate |
| H194 | Patterned from H18 | about 140 MPa | Hardest and most dent-resistant; limited bend radius |
These are commonly specified minimum values for patterned 3003; exact limits depend on the standard and thickness and are shown on the mill certificate. As a guide, plan inside bend radii of at least 1 – 2 × thickness for H114 and H234 and larger for H194, and bend with the pattern facing out.
Choosing a tread pattern
Five-bar
Five parallel bars in each group, rotated in alternate blocks. Grips well, drains water and fuel, and is easier to clean than diamond.
Three-bar
Fewer, wider bars; a lighter-looking pattern used for steps and covers.
Crescent / pointer
A finer pattern used on thinner sheet for lids, kick plates and trim.
Pattern height is typically 0.3 – 1.0 mm depending on the design and base thickness. For walkways where fuel or diesel can spill, choose a deeper pattern and consider adding a grit-coated walkway strip where the client's safety standard requires a tested slip rating.
Sizes and tolerances
Typical supply range
- Base thickness
- about 1.0 – 5 mm (thickness measured excluding the pattern)
- Width
- about 1000 – 1600 mm; 1220 and 1250 mm are common
- Length
- about 2000 – 6000 mm; longer cut lengths and coil for some patterns
- Finish
- Mill, bright-rolled or with protective film
- Standards
- ASTM B632 (rolled tread plate), EN 1386 (tread plates), GB/T 3618 (patterned sheet)
| Base thickness (mm) | Typical thickness tolerance (mm) |
|---|---|
| 1.0 – 1.6 | 0 to +0.2 |
| > 1.6 – 2.5 | 0 to +0.3 |
| > 2.5 – 4.0 | 0 to +0.4 |
| > 4.0 – 5.0 | 0 to +0.5 |
Indicative plus-only tolerances on base thickness; width and length are usually held to about ±5 mm with a diagonal difference of roughly 10 – 12 mm on long sheets. The governing tolerance is the one in the standard named on your order.
Which alloy for which tanker part
| Part | Typical material | Why |
|---|---|---|
| Tank shell and heads | 5083, 5454, 5182, 5754 sheet | Strength and weldability under tank codes |
| Top walkway | 3003 or 5052 tread plate, 2 – 3 mm | Grip, low weight; 5052 for heavier traffic |
| Ladder treads and side steps | 3003-H114 / H234 tread plate | Easy to bend into channel shapes |
| Mudguards / fenders | 3003 tread plate, 1.5 – 2.5 mm | Formable, resists road salt |
| Toolbox and cabinet lids | 3003 tread plate, 1.5 – 2 mm | Appearance and dent resistance |
| Handrails and frames | 6061 or 6063 tube and extrusions | Stiffness and easy assembly |
What to check when buying and receiving
- Name the alloy, temper and standardFor example 3003-H234 to ASTM B632 or EN 1386, with base thickness, pattern and size.
- Confirm pattern directionPattern orientation relative to sheet length affects grip direction and appearance on long walkways.
- Specify surface protectionPVC film or interleaving paper prevents scratches during fabrication and transport.
- Inspect on arrivalCheck base thickness with a pattern-clearing micrometer, pattern height and uniformity, flatness, edges and marking against the certificate.
- Keep it dryStore indoors; water trapped between sheets causes white staining that is hard to remove from patterned surfaces.
References and standards
- ASTM B632/B632M – Aluminum-Alloy Rolled Tread Plate
- EN 1386 – Aluminium and aluminium alloys: tread plate, specifications
- ANSI H35.1 – American National Standard Alloy and Temper Designation Systems for Aluminum
- EN 13094 – Tanks for the transport of dangerous goods: metallic tanks with a working pressure not exceeding 0.5 bar
- EN 573-3 – Chemical composition and form of wrought products
3003 tread plate for tankers: frequently asked questions
Can 3003 tread plate be used for the tank shell?
No. Tank shells are designed to tank codes using stronger 5xxx alloys such as 5083, 5454 or 5182. 3003 tread plate is for walkways, steps, mudguards and lids.
What does H114 mean on tread plate?
It is a temper for patterned sheet rolled from annealed (O) stock. H234 is patterned from H22 stock and H194 from H18 stock, giving progressively harder plate.
Is 3003 or 5052 tread plate better for a tanker walkway?
5052 is stronger and more dent resistant; 3003 is cheaper and easier to form. Many builders use 5052 on heavily used walkways and 3003 for steps, mudguards and boxes.
How is tread plate thickness measured?
By base thickness, excluding the raised pattern. Pattern height is specified separately.
Can 3003 tread plate be welded to a 5083 tank?
Yes, typically with ER5356 or ER5183 filler for brackets on the tank, or ER4043 where crack resistance matters more than strength.
Does it need painting?
Usually not. Mill-finish aluminium tread plate resists fuel, water and road salt; it can be polished for a bright finish.
Building tanker bodies?
Send the pattern, temper, thickness, sheet sizes and quantities. We will confirm availability and a delivered price.
