Architectural tie bars & building connections.
Tension rods, compression struts, building anchors and PT bars. Material, end preparation and matched fittings to your structural drawings.
Illustrative assembly · separate tension and PT routes · studies at independent scales
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View supply details ↗From member to matched accessory.
Match components to the approved assembly drawing.
Architectural members
Architectural tie rod
- Straight tension members with drawing-defined threads and end fittings.
- Tension rods with drawing-defined end preparation
- Compression struts: geometry and stability to project design
- Anchor and hold-down rods
- Adjustment and fastener bar
Connections & Anchorage
Fork & pin
- Twin fork ears straddle a central structural lug; the transverse pin transfers load.
Length adjustment
- Inline adjustment: confirm thread handedness, engagement at both limits and lock-off.
- Forks & Pins — Confirm fork gap, pin diameter, hole fit and bearing surfaces.
- Spades — Confirm plate thickness, pin interface and load-path alignment.
- Couplers — Confirm thread form, engagement, handedness and finish allowance.
- Turnbuckles — Confirm usable adjustment range, thread engagement and locking.
- Anchor Plates & Nuts — Confirm embedment, projection, bearing faces, holes and nut engagement.
Three post-tensioning bar routes
PT bar route
- A separate concrete-member application.
- Smooth, fully threaded and cold-rolled routes remain distinct.
- Smooth PT bars — smooth shaft, threaded ends
- Fully threaded PT bars — compatible continuous thread
- Cold-rolled fully threaded bars — standard, strength and test basis to be confirmed
Post-Tensioning Accessories
PT plate & nut
- The nut bears on the plate at the concrete anchorage face.
- Reinforcement follows the project design.
PT coupler
- Internally threaded sleeve connects two bar ends within the revealed concrete member.
- PT Bar Couplers — Connect adjacent bars; confirm thread compatibility and connection length.
- PT Bar Nuts — Match the bar-end threads and anchorage requirements.
- Bearing Plates — Confirm shape, hole diameter, thickness and material against drawings.
- Washers / Spherical Washers — Select to suit the fit and contact surfaces at the anchorage.
- Spherical Hex Nuts — Confirm the threads and spherical bearing interface.
- Anchorage Zone Helical Reinforcement — Confirm diameter, pitch and geometry against the project design.
- PT Bar Pocket Formers — Form space around the anchorage end; confirm dimensions against drawings.
- Pocket Former Spacer Nuts — Match the former position and end installation requirements.
- Duct Collars / Trumpets — Confirm the duct, anchorage end and grouting interfaces.
- Fiber-Reinforced Nylon End Caps — Match the end geometry, connection and protection requirements.
Grouting & Protection
- Cement Grout — Confirm material properties, installation suitability and acceptance requirements against the project specification.
- Wax, Heat-Shrink Sleeves & Corrosion Protection — Confirm material and interface compatibility with the project exposure and protection system.
Application and connection references
Tension members for roofs, facades and long-span structures.
From round bar to a precise connection.
Drawing-defined rod preparation and machined fittings keep the bar, thread and pin interfaces aligned.
Confirm finished length, fork gap, thread engagement, finish, dimensional inspection and delivery records.
Review tension-member supply ↗
Match the project component list
Confirm dimensions, threads and interfaces
Agree acceptance and delivery records
Marking, protection and shipment
Processing & inspection.
See our steel-processing and inspection operations. Acceptance criteria are agreed before production.
Project inputs to confirm
Project specifications
Confirm specifications against your drawings and order.
Geometry, adjustment & finish
Confirm member forces, tension/compression duty, pin axes, eccentricity, thread handedness, engagement, locking, corrosion category and visible-finish acceptance. Structural sizing and stability remain with the project engineer.
PT bars & anchorage
Agree bar route, strength and material standard, thread compatibility, plates and nuts, anchorage reinforcement, stressing, grouting and protection.
Technical PT route ↗Material routes & documents
42CrMo4 / 4140, 35CrMo and 40Cr are candidate material routes; cross-standard substitutions need verification. No assembly qualification follows from grade alone.
Published supply ranges ↗Send the component list, drawings, quantity and delivery destination.
Engineering anatomy: Dextra Architectural Bar Systems PDS-019 Rev.06, pp. 8–15 and 19–20. Generic illustration; no Dextra capacity or certification is claimed for JOTAIN.
Component specifications, materials and inspection
Materials and technical information
PUBLISHED BAR SUPPLY RANGE
Candidate Bar Materials & Supply Ranges
Bar materials for tension members, anchors and connection parts. Select the grade to meet the structural specification.
42CrMo4 / 4140
Material properties and dimensions
- Standard
- 42CrMo4 (ISO 683-2) / SAE 4140 (SAE J404)
- Supply / Processing
- Black / peeled / machined
- Delivery Condition
- QT or thread-ready
- Possible applications
- Candidate high-strength route for tension and connection components.
- Application Limits
- Confirm approved forces, connection geometry and section size; cross-standard substitutions require verification.
35CrMo
Material properties and dimensions
- Standard
- 35CrMo; verify any proposed SAE 4135 or 34CrMo4 substitution
- Supply / Processing
- Hot rolled / forged / machined
- Delivery Condition
- QT or fastener route
- Possible applications
- Candidate route for threaded and adjustment components.
- Application Limits
- Final assembly properties depend on the complete drawing and process route.
40Cr
Material properties and dimensions
- Standard
- 40Cr; verify any proposed 41Cr4 or SCr440 substitution
- Supply / Processing
- Hot rolled / forged / machined
- Delivery Condition
- Heat-treated or machined blank
- Possible applications
- Candidate route for general connection components.
- Application Limits
- Use depends on target properties, geometry and exposure.
Product specifications and accessories
Specifications to Confirm
Architectural Tie Rods
Keep the tie rod and end fittings aligned.
Architectural tension rods and hangers provide the bar and end-connection route for purchaser-designed roofs, facades, suspended members and long-span structures. Finished length, straightness, eccentricity, rod-end geometry and pin alignment must keep the tension path concentric.
- Supply
- Heat-treated bar, threads or prepared ends, and finish protection to the order.
- Geometry
- Design tension, preload and eccentricity; fork gap, pin diameter, hole fit and effective thread engagement.
- Erection
- Length tolerance, adjustment range, transport limits and installation sequence; visible finish and damage protection.
Compression Struts
Coordinate the strut and its end connections.
Compression struts carry compression in roofs, facades and long-span structures. We supply the member and end connections to the purchaser’s drawing, with the specified effective length, restraints, connection geometry and finish. The project engineer retains system sizing and stability verification.
- Scope
- Compression members and their drawing-defined end connections; supply form and manufacturing route are confirmed for each order.
- Geometry
- Member section, pin-to-pin length, end restraint, fork and pin geometry, tolerances and any permitted adjustment.
- Inputs
- Design compression, buckling requirements, material specification, inspection, finish and installation conditions.
Anchor & Hold-Down Rods
Match setting-out to the erection sequence.
We supply bar and prepared threaded material for drawing-defined building anchorage. Projection, embedment, thread length, bearing plate and nut interfaces, and installation tolerance must match the foundation layout and erection sequence.
- Supply
- Specified bar, cut lengths, prepared threads, identity marking and protected packing.
- Interfaces
- Finished length and straightness, embedded and exposed lengths, plate holes, nut engagement and adjustment allowance.
- Inputs
- Structural drawing, material and property requirements, quantity, corrosion category and inspection basis.
Connection Fittings
Preserve concentric force transfer.
Machined forks, spades and couplers are matched to the approved rod and pin geometry. Pin diameter, hole fit, fork gap, spade thickness, coupler engagement and finish allowance must preserve the connection alignment.
- Supply
- Drawing-defined machining, dimensional inspection and protective finish when specified.
- Interfaces
- Rod-end threads, pin and hole fit, fork gap, spade thickness and minimum coupler engagement.
- Acceptance
- Approved tolerances, gauging and fit checks; inspect the visible finish and protect mating surfaces in transit.
Adjustment & Fastener Bar
Keep engagement throughout the adjustment.
We supply adjustment components and bar material for purchaser-specified connections. Left- and right-hand threads, usable adjustment, lock-off, the method of verifying thread engagement and the erection sequence must be defined together.
- Scope
- Turnbuckles and fastener bar material, with the material route, thread compatibility and assembly checks agreed for the order.
- Adjustment
- Confirm minimum engagement at both adjustment limits, thread handedness, locking and finished-length tolerance.
- Finish
- Confirm coating or plating allowance, visible acceptance and protection during transport and installation.
Post-Tensioning Bars
Post-tensioning for building concrete and precast connections
We supply smooth, fully threaded and cold-rolled fully threaded steel bars with anchorage, installation, grouting and protection accessories for building concrete and precast connections. Bar properties, connection details and stressing requirements follow the purchaser's approved design.
- Bar types
- Three separate bar routes: smooth bars, fully threaded PT bars and cold-rolled fully threaded bars.
- Interfaces
- Confirm threads, couplers, nuts, bearing plates, washers, anchorage-zone reinforcement and installation accessories together.
- Order basis
- For the cold-rolled route, confirm the actual strength class, material standard, dimensions and testing. A route name is not a finished-product performance rating.
Smooth PT Bars
- Bar & Thread Form
- Smooth round bar with threads at the ends; finished geometry follows the approved drawing.
- Accessories
- Couplers, nuts, bearing plates and washers matched to the end connections.
- Specifications to Confirm
- Material standard, diameter, overall length, end threads, strength requirements, surface protection and inspection documents.
Fully Threaded PT Bars
- Bar & Thread Form
- Continuous threads along the bar; thread form, pitch and connection positions are confirmed for the project.
- Accessories
- Compatible couplers, nuts, bearing plates and spherical washers.
- Specifications to Confirm
- Diameter, thread form, cut length, mechanical properties, coupler fit and test requirements.
Cold-Rolled PT Bars
- Bar & Thread Form
- A fully threaded steel bar route; threads and finished dimensions follow the confirmed technical specification.
- Accessories
- Couplers, nuts and anchorage accessories matched to the bar threads and project requirements.
- Specifications to Confirm
- Bar standard, strength class, diameter, pitch, length and acceptance basis must be confirmed with the enquiry.
Supply scope, geometry and installation
SUPPLY SCOPE
Component supply and
engineering responsibilities
JOTAIN supplies architectural tension and compression members, anchorage, connection and adjustment components, and PT products to the purchaser’s approved drawings and specifications.
- Our scope
- Material and product lists, finished dimensions, threads and end preparation, finish, inspection, marking and delivery records.
- Engineering team
- Member forces, tension and compression design, stability, eccentricity, connection geometry, erection sequence, fire-design and durability requirements.
ENGINEERING REQUIREMENTS
Geometry, Adjustment & Visible Finish
Load path, member geometry, finish and erection interfaces govern building-component procurement.
Load Path
Tension, compression, preload and eccentricity
Adjustment
Length tolerance, engagement and erection
Appearance
Visible finish and damage protection
Durability
Corrosion, fire interface and replacement
Product specifications
Building Conditions & Interfaces
Keep force transfer, assembly and the finished appearance aligned.
Geometry
Align rods, struts and end fittings
Finished length, straightness, eccentricity and rod-end geometry affect alignment and force transfer. Compression-member effective length and restraint follow the structural design.
- Interfaces
- Fork gap, pin diameter, hole fit, spade thickness and thread engagement.
- Inputs
- Approved member forces, geometry, tolerances and the complete connection drawing.
Adjustment & Erection
Allow assembly without losing engagement
Confirm finished-length tolerance, usable adjustment, lock-off and the erection sequence. Check minimum thread engagement throughout the permitted adjustment range.
- Interfaces
- Left- and right-hand threads, turnbuckles, couplers and thread-engagement verification.
- Delivery
- Transport limits, site assembly, protected threads and installation access.
Finish & Durability
Treat appearance as an acceptance requirement
Confirm corrosion category, coating or plating, visual acceptance and protection during packing. The project defines the fire-design and replacement interfaces.
- Inputs
- Exposure, desired finish, visible surface acceptance and maintenance requirements.
- Checks
- Coating allowance at mating threads, final geometry and protection against handling damage.
CONNECTION & INSTALLATION
From Member Geometry to Erection
Coordinate structural members, end fittings, adjustment and protective finishes before production.
Tension & Compression
Confirm tension rods and compression struts against their respective forces, member geometry, end restraints and installation tolerances. Structural sizing and stability checks remain with the project engineer.
Add to Project EnquiryConnection & Adjustment
Agree forks, spades, pins, couplers and turnbuckles with the rod geometry. Check left- and right-hand threads, engagement at adjustment limits, lock-off and erection sequence.
Add to Project EnquiryAnchorage & Protection
Coordinate hold-down geometry and PT anchorage with concrete and precast interfaces. Confirm corrosion category, visible finish, fire-design interface and protection during packing.
Add to Project Enquiry- Project Drawings
- Product Selection
- Accessory List
- Inspection Review
- Packing & Delivery
Processing, inspection and delivery
PROCESSING & DELIVERY
From Approved Material to Delivery
A process route for steel bars and machined components. The exact steps depend on the product and order.
- 01
Approved Bar Route
- 02
Heat Treatment
- 03
Straightening & Preparation
- 04
Threads & Ends
- 05
Specified Finish
- 06
Geometry & Packing
INSPECTION & RECORDS
Confirm Inspection
Before Production.
Before production, agree the test scope, sampling locations, inspection stages, acceptance criteria, marking and delivery-release records against the project specification.
Inspection items
Material
Confirm heat identity, mechanical properties and delivery condition against the accepted order.
Connection Geometry
Check finished length, straightness, thread engagement, and fork, pin, spade and coupler dimensions.
Visible Finish
Record surface acceptance, coating or plating checks, and protection during packing.
Order standards and documents
REFERENCE & ORDER BASIS
Standards for Your Order
Use the approved drawings, project specification, inspection plan and stated editions of the standards.
RCSC High-Strength Bolted Joints
Structural-joint design, installation and inspection context when applicable.
Open ReferenceISO 12944-8
Protective-paint specification context for the relevant building exposure and durability requirements.
Open Reference
ACCESSORIES
Connection and anchorage accessories
Connection, anchorage, installation and protection components matched to your project list.
Match bar ends, mating parts and installation geometry against the same approved drawings.
01Forks & Pins
ROD-END CONNECTIONS
Confirm fork gap, pin diameter, hole fit and bearing surfaces.
Spades
PINNED END FITTINGS
Confirm plate thickness, pin interface and load-path alignment.
Couplers
THREADED CONNECTIONS
Confirm thread form, engagement, handedness and finish allowance.
Turnbuckles
LENGTH ADJUSTMENT
Confirm usable adjustment range, thread engagement and locking.
Anchor Plates & Nuts
BUILDING ANCHORAGE
Confirm embedment, projection, bearing faces, holes and nut engagement.
For project-specified post-tensioning applications, matched to the selected bar specification.
PT Bar Couplers
BAR CONNECTION
Connect adjacent bars; confirm thread compatibility and connection length.
PT Bar Nuts
THREADED ANCHORAGE
Match the bar-end threads and anchorage requirements.
Bearing Plates
ANCHORAGE BEARING
Confirm shape, hole diameter, thickness and material against drawings.
Washers / Spherical Washers
BEARING INTERFACES
Select to suit the fit and contact surfaces at the anchorage.
Spherical Hex Nuts
SPHERICAL BEARING
Confirm the threads and spherical bearing interface.
Anchorage Zone Helical Reinforcement
LOCAL REINFORCEMENT
Confirm diameter, pitch and geometry against the project design.
PT Bar Pocket Formers
ANCHORAGE RECESSES
Form space around the anchorage end; confirm dimensions against drawings.
Pocket Former Spacer Nuts
FORMER POSITIONING
Match the former position and end installation requirements.
Duct Collars / Trumpets
DUCT & GROUT INTERFACES
Confirm the duct, anchorage end and grouting interfaces.
Fibre-Reinforced Nylon End Caps
END PROTECTION
Match the end geometry, connection and protection requirements.
Confirm grouting and protective materials against the project protection system.
Cement Grout
GROUTING MATERIAL
Confirm material properties, installation suitability and acceptance requirements against the project specification.
Wax, Heat-Shrink Sleeves & Corrosion Protection
PROTECTIVE MATERIALS
Confirm material and interface compatibility with the project exposure and protection system.
Discuss your project
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