Steel Sheet · Technical Reference
The thickness requirement is not a number that travels between orders — it belongs to a document. Which document applies is decided by the product form, the rolled or coated condition, the nominal thickness and the width it is ordered at. Name those four and the source stops being a matter of opinion; get one of them wrong and a defensible figure is read against a document that does not govern the material.
Limits withheld until the scope is fixed Measurement conditions stated, not assumed Documents matched to the order
No numerical thickness limit is published on this page. A tolerance band is only meaningful once the governing document, its edition, the ordered thickness, the width range and the measurement basis are all known — and those are fixed by your order, not by a general reference. Review the steel sheet specifications to see which product form your requirement falls under.
Selecting the source
A tolerance figure is only as good as the document it was read from. The common failure is not an arithmetic one — it is reading a defensible figure off a document that governs a different product form, a different condition of supply or a different nominal size band than the sheet actually ordered. The register below shows what each form is read against, without reproducing any limit.
| Product form | What governs the thickness requirement | Measurement basis named by the document | What to confirm with the order |
|---|---|---|---|
| Cold-reduced (CR) sheet & strip | Product standard + general requirements | Distance in from the edge, and a separate check inside the body | Dimension schedules are split by thickness range and by width, and the width break points decide which row applies. |
| Hot-rolled (HR) sheet & strip | Product standard + general requirements | Stated per ordered range; edge and body readings differ | Pickled and oiled, as-rolled and annealed deliveries are read under the same dimensional rules as the form, not a separate regime. |
| Hot-dip metallic coated sheet | Coated-sheet standard + general requirements | Rule set by the coated document and the coating designation | The coating class or designated mass is part of the product identification, so it is stated with the dimensional requirement. See how that document is applied |
| Prepainted / organic coated sheet | Coated-sheet standard, then coating the paint system | Substrate rules, with the finished thickness stated as ordered | The paint system is covered separately from the metallic coating, so both requirements travel on the enquiry. |
| Stainless steel sheet | Stainless product standard + general requirements | As written in the governing document for the ordered width | The alloy class and finish designation are confirmed alongside the thickness requirement, because the class belongs to the order. See how that document is applied |
| Perforated & profiled sheet | Substrate requirement, plus the fabrication document | Pattern and forming documents govern where they apply | Hole pattern, pitch and forming profile carry their own documents, which a base-metal thickness figure does not cover. |
Two layers, not one
A sheet requirement usually sits across a product standard and a separate general-requirements document. The product standard identifies the material and the dimension schedule; the general requirements document defines how thickness is measured and accepted. Citing one without the other leaves the acceptance question open.
Systems divide responsibility differently
European, American and Japanese descriptions do not split the same duties between the product standard, the general requirements and the ranges. This is why a figure cannot be carried from one system into another without being re-stated in the terms of the document that will actually govern.
The edition is part of the requirement
Ordering to the right document but an unspecified edition is still an incomplete requirement. State the edition, and confirm which revision governs when a project specification references one of its own.
Method
Two inspectors can measure the same sheet correctly and report different numbers, because the documents describe more than one basis. The basis in use has to be fixed in advance — otherwise every out-of-specification argument is really an argument about procedure.
1Fixed distance in from the edge
The requirement is written at a stated position. Readings taken elsewhere are outside the defined basis.
2Any point across the body, edge zone excluded
The requirement applies across the main area of the sheet, with an edge band outside its scope.
3A minimum, checked at a named location
Documents sometimes pair a distribution requirement with a separate lower bound that has to be verified.
Conditions that have to be bounded
Thickness verification is a procedure: the reading, its position and the instrument are recorded together.
Worked comparisons
These are comparisons an estimator or QA engineer meets in practice. Each one shows the reasoning and the consequence; none of them supplies a numerical limit, because the limit is a property of the document and the ordered size.
The enquiry says hot-rolled but the sheet is ordered coated. The dimensional requirement is read from the coated-product document and its general requirements, not from the hot-rolled document the substrate was rolled under. Carrying the hot-rolled thickness rule across means the coating basis and the ordered thickness basis have never been reconciled.
Consequence: the acceptance question cannot be answered until the coated document is named.
Both are described as cold-reduced sheet of the same nominal thickness, so a single figure from the delivery-conditioned product is applied to both. The temper designation is part of the product identification, and the dimension schedule is read by that identification — a comparable-looking pair is not a comparable requirement.
Consequence: a full-hard order quoted against a delivery-condition figure is not a like-for-like comparison.
One inspector checks at the point the order names; another spots the sheet inside the body. Sections rolled near the limit return different numbers at the two positions. Neither reading is wrong — the difference is that only one of them is at the position the governing document defines.
Consequence: settle the basis in writing before the inspection, not during the dispute.
A 4 × 8 ft sheet is a physical size, not a tolerance class
The most common mix-up is treating the ordered size as if it settled the tolerance. It does not. A 4 × 8 ft sheet can be cold rolled, hot rolled, coated or prepainted, in several delivery conditions, and the thickness requirement is read from the document that matches that combination — the physical size only tells you the width and length the requirement will be applied at. Set the form and condition first; the size comes after.
Where the nominal thickness itself is in question — for example when an order is written in gauge numbers rather than millimetres — the size and gauge charts give the nominal size reference, while the tolerance question stays a question about the governing document.
Writing the requirement
A requirement assembled in the right order eliminates most of the back-and-forth that follows an order. Work down the fields — and where one is genuinely undecided, leave it out of the technical summary and raise it as an open question rather than filling it with an assumption.
Tolerance lookup
This tool does not estimate, interpolate or convert between systems. It collects the conditions that decide which document governs, and it either confirms that a quoted band can be read against a named document and size — or it tells you exactly which document or data you still need. That is the honest answer more often than a number is.
State the conditions
Every field below changes which document governs. Choose the closest honest answer — “not yet decided” is a valid one.
Nothing to report yet
Answer the questions on the left and the lookup will tell you whether a quoted thickness band can be read against a document and size you have named. It will not guess, and it will not carry a figure across standards.
Checking a delivery
A thickness check that is not tied to a document is an opinion. These are the points that decide whether a delivery defect claim can be stood behind — the same points that decide whether a quotation can be compared with another one.
The ordered thickness and width
The row a band is read from depends on the product identification and the width range, so both are recorded before the band is used.
The measurement position and condition
Where the reading was taken, on which basis, and under which stated conditions — recorded at the time, not reconstructed later.
The documents supplied
The certificate and any inspection record the order requires, checked against the grade, the heat or lot identification and the declared dimensions.
The boundary itself
What the document does not cover — coating against base metal, edge against body, and any fabrication operation performed after delivery.
Where the acceptance chain breaks
The inspection record is only as strong as the basis it was taken to. Record the position with the reading.
Adjacent reading
These answer a real specification question. Adjacent material is context for a decision — it is never evidence that two product forms, grades or standards can be used interchangeably.
Where a project allows an alternative product form or grade, treat it as a comparison path rather than a substitution. Confirm the alternative meets the design requirement on chemistry, mechanical properties, ordered dimensions and the applicable tolerance basis before the two are treated as equivalent.
GCC procurement
Across the Gulf the document, edition and measurement basis stay exactly as ordered. What changes with the destination is the import path, the evidence set and the point the material is delivered to — so the thickness clause is written once and the delivery basis is settled per route.
United Arab EmiratesDelivery basisSheet reaching Jebel Ali, Khalifa Port, Sharjah or an inland free zone carries a different final-leg assumption for the same tolerance requirement.Sheet supply for United Arab Emirates
Saudi ArabiaEvidence setThe conformity evidence set for the consignment is settled alongside the dimensional requirement, not after it.Sheet supply for Saudi Arabia
QatarProject documentProject-driven demand often carries its own thickness and tolerance requirements, which are reconciled against the ordered dimensions before ordering.Sheet supply for Qatar
KuwaitWeight basisThe declared weight basis sits underneath the thickness requirement and decides whether two offers are genuinely comparable.Sheet supply for Kuwait
BahrainOrder quantityShorter ocean legs make the ordered quantity interact with how the material is shipped, which is settled with the dimension schedule.Sheet supply for Bahrain
OmanInland legSohar, Muscat and the southern free zones are reached by different inland legs, so the delivery point is named before the schedule is fixed.Sheet supply for OmanCustoms treatment, conformity requirements and duty are confirmed for the actual shipment. They are not inferred from the destination country alone, and no approval, registration or certification status is asserted by this page.
Questions buyers ask
Each of these is settled against your own specification and order conditions. Where a question can only be answered from your documents, the answer says so rather than offering a general figure.
The coated condition governs. Once a hot-rolled substrate carries a metallic coating, the dimensional requirements follow the coated-product document — a general-requirements document for zinc-coated sheet, or the coated-sheet standard the order names — not the hot-rolled document the substrate began under. State the coated document, its edition and the coating designation together, because a thickness requirement read off the uncoated document will not describe what is delivered.
It depends on how the thickness was ordered, and the two answers are not interchangeable. Where a coated-product document defines the basis and the coating designation is stated, the requirement is read as that document sets it out. Where the enquiry names only a base-metal thickness, the coating requirement is a separate line item and the finished thickness is not controlled by the base-metal figure. Say which of the two you mean when you write the enquiry rather than leaving it to be assumed.
No. The two systems divide responsibility differently between the product standard, the general requirements document and the thickness ranges, and they use different measurement rules. A figure taken from one and applied to the other describes something the other document does not define. Keep each requirement under the document and edition it came from, and if you genuinely need an alternative, ask for it to be stated in its own terms rather than converted by assumption.
The governing document states it, and the two common bases are not the same measurement. Requirements are written either at a point at a set distance in from the edge, or at any point across the body excluding a defined edge zone, and some documents add a minimum check at a specified location. Because an edge-adjacent reading and a mid-body reading can return different numbers on the same sheet, the acceptance question is which basis applies — not which reading is correct.
No. The temper designation is what identifies the product, and a full-hard order is not simply a harder version of a delivery condition that carries a temper designation. The product description, thickness range and dimension-schedule entry all follow from that identification, so the designation has to be stated before the dimensional requirement can be read against the right row of the document.
The document and edition, the ruling thickness with the width it belongs to, the condition of supply including any coating requirement and thickness basis, and the physical size the sheet is ordered to. Reading, drying, storage and instrument details belong in the inspection record rather than the commercial enquiry. Everything else — destination, quantity basis, delivery term and documentation set — is confirmed on the enquiry against current company data.
Contact Commercial Department
Give the document and edition, the product form and condition, the nominal thickness and width, the thickness basis and the measurement basis — then the commercial details that make the offer firm: quantity, destination, delivery term and the documents you need.
What happens after you send it
Price on request. Availability, origin, certification, lead time and freight are confirmed on quotation against current company data — nothing on this page should be read as a stock, price or certification statement.
Monday – Saturday, 8.00 AM – 6.00 PM · Sunday closed
Coated sheet carries an additional document layer — state the coating with the thickness basis, not after it.
Still deciding which document governs your sheet?
Compare the standards sheet is commonly ordered to, or send the requirement and let the technical review tell you what is still open.
Noor Deira Steel Trading L.L.C. · Office 3303, Churchill Executive Tower, Business Bay, Dubai, United Arab Emirates
