Hollow Sections for Trusses · Duty-Led Selection
Hollow Sections for Trusses
A truss is usually limited by its nodes, not its members. Chord and web members meet at an angle, force has to pass through a joint that may be welded or bolted, and the wall and corner geometry there decide whether the detail can be built at all. Fix the node configuration first, then the member sections, end preparation, tolerances and the document package the fabricator needs — price, stock and timing follow only from the live enquiry.
Price on request · availability, origin and document package confirmed against the live enquiry
Define the operating requirement first
Specify Hollow Sections for Trusses around the job
Hollow Sections for Trusses should be specified from the duty backward: load path, geometry, connection or fabrication method, environment, governing design requirement and inspection package all affect the section that can be compared. Price, stock, origin, certification and delivery timing are confirmed only against the live enquiry. Start with the requirement that decides fit, then provide the missing order inputs.
Duty & load path role
A truss resolves forces through its members: chords carry the primary bending and axial demand, web members carry shear and transfer it between chords, and the connection transfers force at each node. The member's role and the governing design requirement select the section — not a familiar stock shape.
Geometry & slenderness
Span, depth, panel length and the unbraced length of each member set the geometry the design works to. Nominal dimensions with units, wall and the member's effective length are stated together, because a member's suitability depends on both its section and its length.
Connection & fabrication route
Node connections — welded, bolted or a mix — drive end preparation, fit-up, weld access and detailing. The fabrication route is decided with the section, not after it, because a connection detail the section cannot accept changes the order.
Environment, finish & inspection
Exposure condition, finish, toughness or impact-testing needs and the inspection and document scope are decisions the governing document and the service environment control. Order each only where they apply.
Draw the node before you size the member
Settle the node, then the member
In a truss, the section that carries the force is usually not the section that causes the problem — the node is. Chord and web members meet at an angle, forces have to pass through a joint that may be welded or bolted, and the wall thickness and corner geometry there decide whether the connection is buildable at all. Before fixing member sizes, check that the intended node detail can be fabricated in the shape and wall you have chosen, and note the end preparation the fabricator will need.
Node readiness checklist
Clear the node before the truss is bid
Most truss problems surface at the joint, not in the member schedule. Work through the three groups below — node geometry, weld access and end preparation, and tolerances with the fabricator's document set — and mark each line ready, still open, or genuinely not applicable. Lines flagged as blocking keep the node unbuildable until they are settled, and the panel shows how many remain. This is a coordination check for the detailer and fabricator; it does not size members or check connection capacity, which stay with the engineer.
Joint group
Node geometry & fit-up
Whether a joint can be built is decided by geometry before anything else. If the members cannot meet cleanly, no section choice rescues the detail.
Member intersection angles established
Record the angle each web makes with the chord. Shallow or steep intersection angles change how the weld sits and how the cut end meets the chord face.
Gap or overlap between members fixed
Decide whether the web ends leave a gap, butt together or overlap along the chord, and carry that dimension onto the detail.
Work point and eccentricity agreed
Confirm where the members' centrelines are intended to intersect, and record any deliberate offset rather than letting it fall out of the shop drawing.
Joint group
Weld access & end preparation
A connection the section cannot physically accept is a redesign, not a fabrication problem to solve on the floor.
Weld access at every joint confirmed
Check the welder can reach the whole joint with the process chosen, including the corner regions where a rectangular hollow section concentrates its corners.
End preparation and cut profile specified
State the profile the web ends are cut to so they seat against the chord face as the detail assumes, rather than being fitted by eye.
Corner radius implications checked
Note the corner radius of the sections meeting at the node and confirm the end treatment is compatible with it.
Joint group
Tolerances & document gate
The last lines decide whether the delivered steel lets the shop hold the assembly tolerance the job demands — and whether the fabricator has the paperwork to proceed.
Assembly and fit-up tolerance target stated
Name the assembly tolerance the truss has to achieve, so the section tolerance the supplier works to can be checked against it.
Camber / pre-set requirement identified
If the design calls for camber or a pre-set, record it with the truss geometry so it is not lost between the design and the shop drawing.
Fabricator's document set listed
Name the drawings, certifications and records the fabricator needs to release the truss, and confirm who is expected to supply each.
Node readiness
9
lines still open of 9
- Ready
- 0
- Not established
- 9
- Not applicable
- 0
What this does not do: no member size, wall thickness or connection capacity is calculated here. Those are the engineer's, taken from the governing design and the applicable connection guidance — confirm them before the section is ordered.
Turn open items into RFQ questionsNothing entered here is stored or submitted.
Duty-to-section planner
Build a checkable enquiry
The planner works through the truss from the node outward: member role, geometry and panel lengths, connection method and end preparation, environment, governing design requirement, dimensions, quantity, inspection documents and destination. Anything you cannot answer yet is left open on purpose — it stays unresolved until the engineer, fabricator or buyer who owns it confirms it.
RFQ summary
Choose the route that fits the requirement
Write the specification so offers can be compared
Write the member duty the analysis produces, not just the section name: the governing design requirement, the member role in the truss, the panel lengths and geometry, the connection method and end preparation, and the environment the structure sits in. Add the section family and dimensions with units, quantity and unit basis, the inspection and document scope, and the destination. Anything the engineer has not yet confirmed is carried as open.
Standard, edition & grade designation
The governing standard and its edition fix the scope, the grade range available, tolerances, testing and ordering requirements. Name the standard and edition, and use the complete grade designation rather than a shortened form — the edition controls which requirements apply.
Dimensions, wall & tolerance regime
State the section family, nominal dimensions with units, wall, the member lengths or cut requirement and surface requirement together, and name the tolerance regime the governing document references. A nominal chart value is not an acceptance tolerance.
Design requirement over the standard
A governing design requirement or project specification can impose requirements beyond the standard. Both are stated explicitly, and neither is inferred from the other — the grade designation alone is not a complete purchase specification.
Route & reference
Fix the product form and verify a size before the RFQ
The product form is a separate decision from the grade: a hot finished section and a square section are different routes, and a size reference verifies a dimension before it becomes an ordering basis. A reference does not replace the contract documents for the actual order.
| Truss requirement context | Governing basis | Applies to / limitation | Keep as a separate decision | RFQ field |
|---|---|---|---|---|
| Chord member in a structural truss | Governing structural hollow section standard — applicable edition named | Applies where the governing document specifies this standard and the design requirement sets the chord demand. Confirm the edition, grade range, tolerances, testing and ordering requirements against the project requirement — the standard name alone does not complete the order. | Grade designation, delivery condition, tolerance regime, toughness / impact testing | Standard / edition + grade |
| Web / diagonal member in the same truss | Same governing standard and edition as the chord | The web carries shear between chords, so its own section, length and connection at each node are stated separately; a web member is not automatically the chord's section. | Member length, connection detail, end preparation | Geometry + connection |
| Alternative hollow-section product form | Alternative series or forming route — applicable edition named | A different scope with its own requirements. Close out the node and member inputs before anything is priced. Until then, a nearby section remains a comparison for your engineer rather than a member you have accepted. | Product form, grade, dimensions, fabrication implications | Product route + dimensions |
| Project specification beyond the standard | Governing design requirement / project specification | Where a design requirement or project specification imposes requirements beyond the standard, those requirements are ordered explicitly and confirmed against the actual supply. | Supplementary requirements, inspection scope, documents | Supplementary requirements |
This table is a decision aid only and carries no mechanical value or numerical technical value. Technical choices are conditional on the duty, the selected standard and the grade; every dimension, tolerance, condition or test figure is confirmed against the governing standard, its edition and the material certificate before quotation. Price on request.
Documents & inspection
Match documents and inspection to the order
For truss work, the documents that matter most are the ones your fabricator and checker will ask for: material certification against the standard and edition cited, dimensional or inspection records where the order calls for them, and traceability that lets a member be tied back to its heat or lot if a question is raised later. Name them in the enquiry rather than after delivery.
- Material certification and traceability for the steel supplied, per consignment
- Chemistry and mechanical test record against the governing standard, edition and grade designation
- Impact / toughness test record only where the standard and order require it
- Dimensional and inspection records where the order requires them
- Condition and surface checks against the agreed route
- Heat / lot traceability to the shipped consignment
- Commercial invoice and packing list
- Shipment / origin documents only where applicable to the consignment
- Customs declaration inputs for the destination
What is evidenced, and what stays order-specific
- Material certification and traceability are requested for the steel supplied, against the governing standard, its edition and the full grade designation — never an assumed certificate.
- Toughness and impact testing are ordered only where the governing standard and the service environment call for them, and the record is named in the enquiry.
- Availability of any certificate or approval is confirmed for the actual supply — not assumed from this page or from a nearby route.
Commercial inputs
Commercial inputs that remain quotation-dependent
A truss order is priced on the members and the joints together, so the supplier needs the member roles, the node and connection details, the sections, the dimensions with units, the member lengths, the quantity and unit basis, the documents, the destination and the named Incoterms place. Availability, freight and delivery timing follow the live shipment.
Packing
Sections bundled, strapped, tagged and marked by shape, nominal size, wall, grade, heat and lot, matched to the declared route. Packing expectations are confirmed in the enquiry.
Delivery point & schedule
Name the consignee or importer, the port or inland delivery point and the required-on-site date. Timing is checked for the live shipment and stated on the quotation.
Incoterms rule & named place
State the Incoterms rule and the named place so packing, transport and document obligations are explicit, and name the party responsible for each action.
Carry the enquiry into the commercial department
Turn the member roles, node and connection details, sections, dimensions, member lengths, standard and edition, grade, documents, quantity, destination and Incoterms named place into one copyable summary. The commercial department checks the node details against the sections offered before quoting, so a joint that cannot be fabricated in the chosen wall is caught early.
Price on request — freight, duty, availability and delivery timing are confirmed with your quotation.
Related routes worth comparing
Open a related page to resolve one decision
This page is bounded to truss work and the node conditions it brings. For columns, machinery frames or exposed architectural members the sibling application pages are the right route; the structural steel family is a wider comparison rather than a drop-in alternative.
Structural steel products
If the truss geometry is not yet fixed, an open profile is a genuine alternative worth weighing at the design stage. Structural steel is linked for that comparison; it is a different family with different node behaviour, so the choice belongs with the engineer rather than the buyer.
Compare the structural steel formGCC markets & destination planning
Plan the GCC destination separately from the steel specification
Keep product compliance separate from destination planning. Confirm consignee/importer details, named port or inland delivery point, Incoterms rule and named place, shipment documents, any permit/conformity steps required for the actual goods, and the party responsible for each action. No country card implies a local office, warehouse or stock position.
United Arab Emirates
Destination & importer inputs
Move from truss section selection to the exact UAE procurement route: carry the standard edition, grade, section shape, nominal dimensions, tolerance regime, quantity and destination emirate so the quotation and document set match the import.
United Arab Emirates hollow-section procurement
Saudi Arabia
Project specification & import inputs
Confirm the standard and edition, grade, shape, nominal dimensions, tolerance regime, quantity and required-on-site date so the estimate and logistics stay aligned to the governing project specification.
Saudi Arabia hollow-section procurement
Bahrain
Industrial supply inputs
Coordinate the standard edition, grade, tolerance and inspection requirements, document list and delivery point to the Bahrain requirement so the truss section and its document set stay aligned.
Bahrain hollow-section procurement
Kuwait
Contractor procurement inputs
Link truss section selection and any cutting or processing to the fabrication and inspection needs, with the delivery point and Incoterms named place agreed against the requirement.
Kuwait hollow-section procurement
Oman
Port-oriented supply inputs
Confirm the specification, nominal dimensions, quantity, document package, port and Incoterms rule so the Oman quotation and logistics stay aligned to the order.
Oman hollow-section procurement
Qatar
Specification & delivery inputs
State the standard and edition, grade, shape, nominal dimensions, delivery condition, documents and delivery location so the Qatar quotation is fixed on a verified basis.
Qatar hollow-section procurementTechnical reference
Confirm the source scope, then compare it with the requirement
Use the connection design guidance to frame the questions your node detail raises, then take those questions to the engineer of record. Design guidance supports the conversation; it does not confirm the adequacy of your member or replace the contract documents.
American Institute of Steel Construction — Design Guide 24, HSS Connections
Published connection design guidance · reviewed for scope and terminology
Design Guide 24 addresses connections to hollow structural sections — the node condition that shapes a truss member's end preparation, fit-up and detailing. Use it to confirm its own published scope and terminology, then compare that scope with the project requirement for the actual order. Connection design remains the responsibility of the engineer of record.
What this means for your order: the reference helps fix the questions that must be answered in the RFQ — the standard and edition, the full grade designation, the section shape, the nominal dimensions with units, the member lengths and the connection method. Conformity, certification and commercial outcomes remain separate, verification-dependent steps after the technical product description is complete.
What it does not cover: the reference does not prove Noor Deira Steel inventory, price, certification, local presence or project approval, and it does not replace the contract documents for the actual order. Verify the purchase order and the current licensed edition, because a governing design requirement can impose requirements beyond the referenced guidance.
What a complete enquiry improves
A complete enquiry makes three things easier
Truss enquiries are most useful when the node is described as carefully as the member. Saying how the chords and webs meet, what end preparation the joint needs and what tolerance the assembly is built to means the sections offered can actually be fabricated into the truss on the drawing.
Buyer concern
Section chosen from a familiar shape
Evidence-led answer
Every value is forced against the duty and load role, the governing design requirement, the standard and edition, the grade designation, geometry, connections and exposure — never assumed from a stock shape or a similar-looking truss.
A truss section whose basis is an auditable, order-driving input set.
Buyer concern
Automatic substitution between nearby grades
Evidence-led answer
The enquiry keeps the standard, edition, grade, product form, delivery condition, dimensions, tolerance regime and testing as separate decisions, so a nearby grade is only a comparison until the engineer or project requirement accepts it.
A truss section that matches the governing document rather than a similar-sounding grade line.
Buyer concern
Geometry and tolerance ambiguity
Evidence-led answer
Span, panel and member lengths, nominal dimensions with units, wall and the tolerance regime referenced by the governing specification are carried together, with any cut or length requirement.
A member a fabricator can cut, weld and re-check against the governing document.
Buyer concern
Connection and fabrication surprises
Evidence-led answer
The connection method, end preparation, weld access and finish are explicit inputs, decided with the section rather than after it.
A section the connection detail can actually accept.
Buyer concern
Undocumented testing or traceability
Evidence-led answer
Testing, inspection and document needs are named explicitly, with the expected issuer, before any value is quoted — and only where the standard and order require them.
An evidence set that matches the steel actually shipped, not an assumed certificate.
From requirement to quotation
Every step names its owner, input and open item
Seven steps take a truss requirement to a delivered consignment. The node and connection details are settled at the second step, while the geometry can still change, rather than after the sections are ordered.
Requirement
Buyer + engineer
In: Service and load role, governing design requirement, standard and edition, grade or material route, shape, nominal dimensions with units, quantity and unit basis.
Out: Service and governing document defined; route identified.
No standard or edition named.
Next: Name the standard and edition.
Geometry & connections
Buyer + fabricator
In: Span, depth, panel and member lengths, connection method, end preparation, finish and exposure.
Out: Condition, tolerance and fabrication basis stated.
Connection detail left implicit.
Next: Fix connection and tolerance inputs.
Tests & documents
Technical / inspection
In: Testing and inspection scope, required document list with expected issuer.
Out: Evidence and document package named.
Documents assumed, not requested.
Next: Confirm the document checklist.
Destination & importer
Buyer + commercial
In: Consignee / importer details, port or inland delivery point, Incoterms rule and named place.
Out: Destination and clearance owner explicit.
Importer or named place not confirmed.
Next: Add importer and named place.
Quotation
Commercial
In: Quantity and unit basis, processing scope, packing, documents and required-on-site date.
Out: Availability, commercial terms and document package confirmed for the live enquiry.
Open items carried into the offer.
Next: Receive the confirmed offer.
Packing & shipping
Supplier / forwarder
In: Strapping, tagging, marking, Incoterms rule, port.
Out: Coordinated to the named delivery point.
Document delay.
Next: Track to the delivery point.
Delivery & follow-up
Commercial
In: Site handover, closed-out documents.
Out: Handed to site with the document set.
Open claims.
Next: Close out.
Review unresolved items before quotation
The load role, standard and edition, grade designation, product form, geometry, condition, connection and fabrication inputs, quantity, destination and commercial terms enter the enquiry together so the specification, the evidence and the delivery terms stay aligned.
Request a QuoteBuyer FAQ
Questions to settle before ordering
What usually limits a truss section, which decisions come first, and how the tolerance basis for the assembly belongs in the enquiry.
What usually limits a truss section?
Which sections should be fixed first?
What tolerance does the assembly need?
What belongs in the RFQ?
Qualified RFQ
Request a qualified Hollow Sections for Trusses quotation
Send the governing standard/edition, grade or material route, section shape and dimensions with units, quantity/unit basis, intended service, fabrication or connection notes, tests/inspection, required documents, destination and named delivery place. If an item is still undecided, mark it open rather than guessing. The quotation will confirm availability, commercial terms and the supply-specific document package.
Price on request · availability and commercial terms confirmed against the live enquiry