Steel Detailing • Piece Marking • Fabrication
Structural Steel Detailing
Fabrication-ready shop and erection drawings for structural steel, detailed to reflect real workshop and site-erection practice.
Shop drawingsConnectionsPiece marksErection
Hover a member · illustrative values
From Structural Design to Every Fabricated Piece
Steel fabricators win work on turnaround and accuracy.
One element, followed from the engineer's design to its place on site. Scroll to watch it change.
01
Structural design
The engineer's drawings, calculations or model define the structure.
02
Steel model
The design becomes a coordinated 3D steel model.
03
Detailing
Each member gets plates, bolts, stiffeners and welds.
04
Fabrication documentation
Shop drawings, piece marks and schedules for the workshop.
05
Erection
The piece goes up in sequence with its neighbours.
Every Detail Has to Work Beyond the Drawing
A detailing bottleneck — whether that's a busy in-house team or a tender deadline — directly slows down quoting and fabrication. Detailing errors are worse: a missed connection detail or bolt clash found on-site is expensive to fix, both in direct rework cost and in the knock-on delay to erection sequencing and crane bookings that a single wrong piece can cause. On a project running to a fixed crane hire date, a detailing error discovered mid-erection doesn't just cost the price of re-fabrication — it can cost an entire booked crane shift sitting idle.
01
Missed connection detail
02
Drawing issue
03
Fabrication issue
04
Rework
05
Erection delay
Conceptual sequence, not a measured outcome.
Piece-by-Piece Steel Detailing
Steel detailing turns an engineer's structural design into the piece-by-piece documentation a fabrication shop actually builds from: shop drawings for individual members, connection and bolt detail, and erection drawings that sequence how the structure goes together on site.
We detail from structural engineering drawings, calculations or a coordinated 3D model, and can work in Tekla Structures or AutoCAD depending on your workflow and whether the project needs a full structural BIM model for coordination with other disciplines. The choice of platform is rarely arbitrary — a project running clash detection against services and architectural models genuinely benefits from a Tekla model, while a smaller standalone steel package may not need that overhead.
This is the fabrication-level specialisation of structural drafting.
Every Member Gets Its Own Detail
Select any column, beam or brace to see its piece mark, drawing reference and the parts detailed with it. Values are illustrative.
Click a column, beam or brace
- Piece mark
- B-104
- Member
- BEAM
- Drawing
- S-104
- Status
- For construction
Exploded · illustrative
Shop Drawings Built for the Fabrication Floor
Shop and erection drawings produced member-by-member with full connection detail, checked against realistic fabrication tolerances as detailing progresses.
The sheet below is drawn in stages: outline, dimensions, hole locations, piece mark, connection callouts, then revision information.
Where Steel Actually Comes Together
Yes, connection detailing covers whatever connection type the structural engineer's design specifies, including moment connections where the design calls for full or partial moment transfer.
Connection detail
Select a part
- Choose a part to see how it is detailed.
- Values on the diagram are illustrative.
- Member interface
- Bolt pattern
- Plate geometry
- Weld information
- Engineer reference
Detailing With Fabrication in Mind
Connection detailing on a steel package is where fabrication cost is often won or lost. Two connections that satisfy the same engineering capacity can carry very different fabrication costs depending on how many welds, cuts and copes they require — we flag options where a simpler, equally compliant connection detail could reduce fabrication time, rather than defaulting to whichever detail happens to be first to hand.
Yes, where a simpler, equally compliant connection would reduce fabrication time, we'll flag it for the engineer's consideration rather than defaulting automatically to a more complex detail.
Illustrative comparison. Detailing weighs fabrication practicality alongside the engineer's specified requirements, and simplifications go to the engineer for review.
Detailing Software That Matches the Steel Package
We detail from structural engineering drawings, calculations or a coordinated 3D model, and can work in Tekla Structures or AutoCAD depending on your workflow and whether the project needs a full structural BIM model for coordination with other disciplines. The choice of platform is rarely arbitrary — a project running clash detection against services and architectural models genuinely benefits from a Tekla model, while a smaller standalone steel package may not need that overhead.
The Drawing Set Carries the Quantities
Material take-offs and bolt lists are produced alongside the drawing set, giving fabrication and procurement teams consistent quantities to work from, rather than a separate estimate that has to be reconciled against the drawings later.
Hover a member or a schedule row: each highlights the other.
- 3D structural model
- Model elements
- Material take-off
- Bolt list
Material take-off
Illustrative
| Piece mark | Member | Qty | Material | Length |
|---|---|---|---|---|
| C-01 | Column | 6 | S355 | 8 000 |
| B-101 | Beam | 7 | S355 | 8 000 |
| B-201 | Beam | 7 | S355 | 8 000 |
| BR-01 | Brace | 4 | S275 | — |
Bolt list
| Mark | Size | Qty | Connection |
|---|---|---|---|
| M20 | M20 8.8 | 48 | Beam to column |
| M16 | M16 8.8 | 16 | Bracing gusset |
| M24 | M24 8.8 | 24 | Base plate |
Piece Marking That Keeps the Fabrication Floor Organized
Piece marking is treated as a first-class part of the detailing output, not an administrative afterthought. A consistent, logical piece-mark system makes the difference between a workshop floor that can track hundreds of individual members through cutting, drilling and welding without confusion, and one where two similarly-marked pieces get swapped and only discovered during erection.
For fabricators working across multiple simultaneous jobs, keeping piece mark numbering consistent across projects — rather than reusing the same mark scheme in a way that could cause confusion between concurrent jobs on the same shop floor — is a small detail that avoids a surprisingly common and easily preventable mix-up.
- Piece mark
- B-102
- Drawing
- S-102
- Fabrication
- Ready
Job A · separate numbering
- A-001
- A-002
- A-003
- A-004
Job B · separate numbering
- B-001
- B-002
- B-003
- B-004
Distinct mark schemes keep concurrent jobs on one shop floor from being mixed up. Marks shown are illustrative.
One Steel Frame → Every Fabricated Piece
Scroll to take the structure apart: each member, connection and group generates its own documentation, then everything returns as one package.
01
Assembled frame
The engineer's structure as one model.
02
Every member marked
Each piece gets its own mark.
03
Connection details
Each connection gets its own detail.
04
Shop drawings
Groups of pieces become shop drawings.
05
Material take-off
Quantities follow the same model.
06
Erection sequence
Pieces go back together in order.
07
Fabrication package
One organised, revision-controlled set.
Detailing That Follows the Erection Sequence
Erection sequencing is coordinated with the fabrication programme where that information is available — there's little point detailing a perfectly correct structure if the drawing set doesn't reflect the order pieces actually need to arrive on site and go up, particularly on projects with limited laydown area or a tight crane schedule.
- Erection zone
- Crane window
- Member delivery
- Assembly sequence
The zone and crane window are conceptual markers, not crane engineering.
From Shop Floor to Site
Yes, where individual pieces need to stay under a specific transport or crane lifting limit, we detail member splits and connections to respect that constraint rather than producing pieces that can't actually be moved to site.
What You Get
A fabrication package, one sheet type at a time.
Included in this sheet type
- Shop drawings (individual member detail)
- Revision-controlled for-construction drawing sets
Where Steel Detailing Fits
Fabrication shop
Structural steel fabrication shops
Warehouse
Industrial sheds and warehouses
Platform & walkway
Platforms, walkways and mezzanines
Mining / processing
Mining and processing plant structures
Commercial building
Commercial building structural steel packages
Multi-storey frame
Multi-storey steel-framed buildings
How Steel Detailing Moves to Fabrication
01
Design input
Structural drawings, calculations or model, plus fabrication standard and bolt/weld preferences, along with any site access or crane constraints affecting sequencing.
02
Scope & quote
Drawing set, software (Tekla or AutoCAD) and turnaround confirmed before starting, based on the actual size and complexity of the steel package.
03
Detailing
Shop and erection drawings produced member-by-member with full connection detail, checked against realistic fabrication tolerances as detailing progresses.
04
Checking
Drawings checked against structural design intent and fabrication practicality, with any ambiguity in the source design flagged back to the engineer rather than guessed at.
05
Delivery
For-construction drawing set issued with material take-offs and piece mark schedules ready for the fabrication shop floor.
Detailing Checks Before It Reaches the Shop Floor
Drawings checked against structural design intent and fabrication practicality, with any ambiguity in the source design flagged back to the engineer rather than guessed at.
- Inspection checklist
- Design intent
- Member detail
- Connection
- Fabrication practicality
- Piece mark
- Revision
- Flag for engineer review where the source design is unclear
Built for Projects That Change
Yes, detailing stable, confirmed portions of a design while later stages are still being finalised is a common approach on fast-track projects, with clear flagging of which areas remain subject to change.
| Revision | Description | Status |
|---|---|---|
| ISSUE A | Primary frame and first-level beams for pricing. | Issued |
| ISSUE B | Second-level beams added as the design develops. | Viewing |
| ISSUE C | Bracing added to the front bay; connection reviewed. | Issued |
| ISSUE D | Upper bracing added; one edge beam removed. | Current |
Every Document Traces Back to the Model
Choose a document to see which members of the model it describes.
Steel Detailing Across Industrial Environments
Related Steel Detailing Projects
Illustrative examples, marked as such. They will give way to verified case studies as client work is cleared for publication.
Steel Detailing FAQs
Structural drafting is the broader service covering general arrangements, structural documentation and BIM. Steel detailing specifically refers to the fabrication-level shop and erection drawings used to build structural steel — the piece-by-piece detail a workshop actually cuts and welds from.
Yes, Tekla is one of our standard structural steel detailing platforms alongside AutoCAD, depending on project needs and whether coordination with other discipline models is required.
Yes, these are typically delivered alongside the shop and erection drawing set, generated from the same detailed model so quantities stay consistent with what's actually drawn.
Yes — where the project is running in a shared BIM environment, structural steel detailing can be coordinated for clash detection against architectural and MEP models before fabrication starts.
We apply a consistent, logical piece-mark convention that scales with project size, agreed with your fabrication team upfront so it matches how your shop floor tracks work in progress.
Yes, detailing that accounts for a specific installation sequence or access constraint is a common requirement on brownfield and plant modification projects.
Yes, where a simpler, equally compliant connection would reduce fabrication time, we'll flag it for the engineer's consideration rather than defaulting automatically to a more complex detail.
We coordinate piece mark schemes to avoid overlap with other concurrent jobs on the same shop floor where this information is available, since reusing similar mark numbers across simultaneous projects is a preventable source of mix-ups.
Yes, cutting lists derived from the same detailed model as the shop drawings are a standard part of this service, keeping quantities consistent with what's actually detailed.
Yes, connection detailing covers whatever connection type the structural engineer's design specifies, including moment connections where the design calls for full or partial moment transfer.
Where this information is relevant to the project and supplied or discussed with the erection contractor, we can reflect practical rigging and pick-point considerations in the erection sequence drawings.
We can adjust bolt, weld and connection preferences to match a new fabricator's shop capability, since these preferences are usually confirmed and applied at the detailing stage rather than baked irreversibly into the structural design itself.
We can begin detailing from a structural engineer's preliminary design, though final for-construction issue should reflect the certified design to avoid detailing against information that may still change.
Yes, weld symbols are shown to reflect the specified weld type and size, with cross-references to relevant welding procedure specifications where these are supplied by the fabricator or engineer.
Yes, detailing stable, confirmed portions of a design while later stages are still being finalised is a common approach on fast-track projects, with clear flagging of which areas remain subject to change.
Yes, paint and coating call-outs are included where specified by the engineer or project specification, cross-referenced against the relevant coating system.
Yes, connection detail is adapted to a fabricator's standard bolt grades and sizes where these preferences are supplied, provided they still satisfy the engineer's specified capacity.
Complex or irregular geometry is usually where a full 3D structural model earns its keep over 2D-only detailing, since it lets member and connection geometry be checked visually for interferences that are hard to spot on a 2D drawing alone.
Yes, splitting a detailed drawing set to align with how a project has actually been packaged for fabrication and delivery is a common coordination task, checked so piece marks and interfaces stay consistent across packages.
Yes, for larger jobs we can provide a sheet-by-sheet issue schedule so the fabricator can plan procurement and shop capacity against a predictable drawing release sequence rather than waiting for the whole set at once.
Yes, where the engineer's design anticipates future extension, connection detail can be prepared to suit that future work explicitly, rather than only the current structure in isolation.
Yes, coordinating piece marking and interface detail so members fabricated by different workshops still fit together correctly on site is a common requirement on larger or split-package jobs.
Yes, where individual pieces need to stay under a specific transport or crane lifting limit, we detail member splits and connections to respect that constraint rather than producing pieces that can't actually be moved to site.
Yes, secondary steel detailing is included as part of a complete shop and erection drawing package where the project scope calls for it.
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