Short answer: Choose steel tape thickness from the approved cable design and applicable project requirements, then confirm the tolerance, measurement basis, coating, width and production-line fit. A nominal thickness on its own is not a complete purchase specification.
In Zhongbo's original LinkedIn post, we noted four common thickness requests: 0.20 mm, 0.30 mm, 0.50 mm and 0.80 mm. These are enquiry examples, not a universal table assigning a thickness to every cable application. The permitted construction and acceptance limits must come from the governing specification.
Confirm that steel tape is the approved armour format
Thickness selection starts after the cable designer has established the armour construction. The installation conditions, mechanical duty and other design constraints determine what the cable needs. Procurement should not substitute a different tape thickness or armour format without the required design approval.
If the decision between wire and tape is still open, use our steel wire versus steel tape guide for the broader comparison. This article addresses the dimensional and order details once steel tape is being specified.
Define what the thickness value means
Write the nominal thickness and permitted tolerance together. Ask the supplier and buyer's quality team to confirm how the governing specification defines and measures thickness, including whether the stated value applies to the steel substrate or the coated product.
Record the agreed test method and measurement conditions. If the order, drawing and inspection instruction use different definitions, resolve the difference before production. A value that looks identical in two quotations may still be based on different assumptions.
| Specification field | What to record | Who should confirm it |
|---|---|---|
| Nominal thickness | Approved value and drawing or specification revision | Cable engineering |
| Thickness tolerance | Permitted limits under the governing requirement | Engineering and quality |
| Measurement basis | Substrate or coated-product basis, method and conditions | Buyer quality team and supplier |
| Width and tolerance | Width required by the approved wrapping arrangement | Cable engineering and production |
| Coating | Specified zinc requirement and acceptance method | Engineering and quality |
| Mechanical properties | Required properties for the material and forming process | Engineering and production |
| Edges and shape | Agreed edge condition, camber and flatness requirements | Production and quality |
| Coil format | Inner and outer dimensions, unit weight and winding requirements | Production and material handling |
Review thickness with the rest of the tape specification
Thickness and width affect the material presented to the taping line. The approved wrapping arrangement also needs to account for overlap and the finished cable geometry. The cable manufacturer should confirm those relationships rather than treating a thicker strip as an automatic improvement.
Coating and mechanical properties need separate requirements. A thickness value does not establish zinc-coating acceptance, surface condition or forming behaviour. Keep those fields explicit in the technical agreement so an inspector can evaluate each requirement against its own basis.
For general coating terminology, see the zinc coating guide. Use the order's applicable standard and test method when setting acceptance limits.
Check the coil against the production line
Confirm how the coil will be loaded, paid off and guided through the line. Share the equipment's permitted coil dimensions and weight with the supplier. Include any agreed requirements for edges, shape or winding that affect handling and tracking.
Where the tape specification or supply format is new to the line, agree whether a sample or trial is needed. Record the material specification used in that trial and the criteria for approval. A successful trial is easier to apply to a bulk order when the tested material and the order documents describe the same product.
Close the order with one approved revision
Before release, bring the drawing, purchase specification and inspection instruction into agreement. Check that the quotation covers the same thickness, tolerance, coating and coil format. If a proposed alternative changes any of those fields, obtain the required technical approval and confirm its effect on the supply plan.
- Confirm the approved tape thickness and specification revision.
- Write the tolerance and measurement basis beside the nominal value.
- Complete the width, coating, mechanical and coil-format requirements.
- Resolve any sample or line-trial conditions.
- Agree inspection evidence and the process for handling deviations.
Zhongbo can review galvanized steel-strip enquiries against the buyer's dimensional, coating, mechanical and packing requirements. Send the specification and identify any fields still under review so the team can confirm manufacturability before the order is finalised.
Frequently asked questions
Can I choose between 0.20, 0.30, 0.50 and 0.80 mm from a generic application chart?
Those values are common requests cited in Zhongbo's LinkedIn post. They are not a substitute for the cable design, governing standard or project specification.
Should zinc coating be included in the thickness value?
Use the definition in the governing specification and confirm the measurement basis with the supplier. Do not leave the substrate-versus-coated-product distinction implicit.
Can a supplier change the thickness to improve availability?
A proposed change needs the required cable-design and project approval. Confirm the revised specification, production-line implications and inspection criteria before accepting it.
What should accompany a thickness enquiry?
Include the application, applicable specification, nominal thickness and tolerance, width, coating requirement, mechanical properties, coil format, quantity and inspection expectations.
Send your steel-tape specification to Zhongbo for a review of the dimensional, coating and supply requirements.
Related resources
- Steel wire or steel tape for cable armouring — the armour-format comparison.
- Galvanized steel strip for armouring — product and enquiry context.
- Test reports and inspection — evidence to agree before shipment.
Source
Adapted from Zhongbo Steel's LinkedIn post on choosing steel tape thickness by application conditions, originally published 27 February 2026. The specification worksheet above expands the original post into an order-review tool.
