Bridge tension rods.
Post-tensioning bars.
Tension rods, connection parts and post-tensioning bars for bridge and rail projects. Explore hanger connections and post-tensioning anchorage as separate assemblies.
Bridge component illustrations
Hanger / tension assembly
Separate post-tensioning assembly
Smooth PT bars with threaded ends and matching anchorage components.
View specifications ↗Bridge steel bars and accessories
Hanger and tie rod components
Specify the hanger or tie rod together with its end connections: bar, fork, pin and adjustment hardware.
Tension rods
- Confirm the bar diameter, finished length, end threads and delivery condition against the hanger or tie-rod drawing.
Fork-end connector
- Confirm the fork opening, pin diameter and mating plate thickness together at the connection.
Turnbuckle
- Specify left- and right-hand threads, adjustment range and locking arrangement as one assembly.
Post-tensioning bars and accessories
Match bars, couplers and anchorage accessories to one drawing set. Post-tensioning bar specifications ↗
PT bars
- Choose the smooth or fully threaded bar route, then confirm dimensions, end preparation and acceptance requirements.
Threaded couplers
- Check thread form, engagement length and bar-to-coupler fit against the approved connection detail.
Bearing anchorage
- Coordinate nuts, washers and bearing plates around the bar, bearing faces and anchorage drawing.
Other supply options
View fork-end assembly details
Assembly and pin details
Connections in context.
Technical specifications, material routes and inspection
Materials and technical information
PUBLISHED BAR SUPPLY RANGE
Candidate Bar Materials & Supply Ranges
Evaluate materials against section size, fatigue and fracture design inputs, machinability, delivery condition and owner specifications.
42CrMo4 / 4140
Material properties and dimensions
- Standard
- 42CrMo4 (ISO 683-2) / SAE 4140 (SAE J404)
- Supply / Processing
- Black / peeled / machined
- Delivery Condition
- Q&T or rough machined
- Possible applications
- Material to consider for highly loaded pin, rod and shaft blanks.
- Application Limits
- Fatigue and fracture acceptance remain project-specific; cross-standard substitutions require verification.
34CrNiMo6
Material properties and dimensions
- Standard
- 34CrNiMo6; any proposed SAE 4340 substitution requires verification
- Supply / Processing
- Hot rolled / forged / machined
- Delivery Condition
- Q&T or forged route
- Possible applications
- A higher-hardenability material route to evaluate for large sections with toughness requirements.
- Application Limits
- Use only where permitted by the approved material specification.
35CrMo
Material properties and dimensions
- Standard
- 35CrMo; verify any proposed SAE 4135 or 34CrMo4 substitution
- Supply / Processing
- Hot rolled / forged / machined
- Delivery Condition
- Q&T or fastener bar supply route
- Possible applications
- Candidate material for drawing-defined threaded and fastener components.
- Application Limits
- Material supply does not establish connection system compliance.
Product specifications and interfaces
Specifications to Confirm
Post-Tensioning Bars
Connecting Bridge Segments and Structural Members
Post-tensioning bars and accessories for conventional bridges, precast segmental bridges, railway bridges, viaducts and metro station connections. Confirm bar form, connection method and the delivery list against project requirements.
- Bar types
- High-strength fully threaded and smooth post-tensioning bars
- Additional Route
- CR Bar 1080 is listed as a supply route; the exact specification and performance remain subject to confirmation.
- Enquiry
- Bar diameter, length, threads, material standard, performance requirements and accessory quantities
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.
Coupling & Anchorage
Coordinating Accessories Around a Common Interface
Accessories for segment connections and end anchorage of post-tensioning bars. Check threads, bearing faces, engagement lengths and installation space against bar and anchorage drawings.
- Connection Parts
- PT bar couplers and nuts
- Anchorage Parts
- Bearing plates, washers, spherical washers and spherical hex nuts
- Enquiry
- Bar-to-accessory compatibility, interface drawings, materials and inspection requirements
Soft-Eye & FRP Bolts
For Underground Stations and TBM Breakthroughs
Cuttable Soft-Eye reinforcement and solid FRP rock bolts for metro stations and TBM launch and reception areas. Confirm materials, component lists and delivery form against retaining structure and breakthrough zone designs.
- Products
- Cuttable Soft-Eye reinforcement and solid FRP rock bolts
- Application Area
- Underground station retaining structures, TBM breakthrough walls and reception structures
- Enquiry
- Zone drawings, component dimensions, material properties, connections and acceptance requirements
Tunnel Support
Products Matched to Ground and Support Designs
Rock bolts, forepoling umbrella pipes and lattice girders for immediate and permanent tunnel support. The project design determines the support system; product specifications, interfaces and accessories are then confirmed individually.
- Rock Bolt Routes
- Self-drilling hollow bolts, expandable friction bolts, mechanical rock bolts and anchor head accessories
- Additional Products
- Solid and hollow FRP bolts, steel or FRP combination bolts, tunnel lattice girders and forepoling umbrella pipes
- Enquiry
- Support drawings, bar and tube specifications, accessories, protection and inspection requirements
Hangers & Tie Bars
Fatigue Resistance at Threads and Ends
High-strength bar material for repeated loading, with ends machined to drawings. Repeated loads concentrate demand at thread roots, end transitions and connection details; the fatigue design basis must govern the supply route.
- Supply
- Heat-treated bar, thread or end machining and dimensional inspection
- Fatigue & Fracture
- Cyclic loading details cannot be defined by static strength targets alone.
- Inputs
- Fatigue category, load spectrum, fracture toughness and service temperature
Anchor & Threaded Rods
Durability in Loaded Anchorage Zones
Bar and prepared threaded material for buyer-designed infrastructure anchorage. Protection of exposed threads and transitions, drainage, inspection access and replacement strategy determine lifecycle reliability.
- Supply
- Specified grade, cut lengths and protection as required.
- Lifecycle
- Inspection access and corrosion protection influence the supply route.
- Inputs
- NDT scope, protection system, inspection access and replacement strategy
Bearing Pins & Shafts
Pin-to-Bore Fit and Contact Integrity
Tough, machinable blanks for articulated and rotating interfaces. Diameter, roundness, surface condition, core toughness and internal quality must support the specified bearing and articulation interfaces.
- Supply
- Q&T bar, rough machining and UT as specified.
- Connections
- Bolt and pin interfaces depend on installation and fit.
- Inputs
- Preload or slip-resistance design intent, pin and bore tolerances, surface and assembly condition
Supply scope and operating conditions
SUPPLY SCOPE
Component supply and
engineering responsibilities
JOTAIN coordinates bars, accessories and related products for post-tensioning, structural connections and tunnel support against the project procurement list.
- Our scope
- Product specification, material and dimensions, accessory interfaces, protection, inspection basis, identification and delivery records.
- Engineering team
- System design, load and fatigue calculations, stressing parameters, support layout and final engineering acceptance requirements.
ENGINEERING REQUIREMENTS
Loads, connection geometry and protection
The following information applies to relevant bridge steel components and candidate round bar routes, subject to project drawings and acceptance requirements.
Loads
Repeated loading, fatigue and occasional impact
Structural Integrity
Fracture toughness and specified NDT
Connections
Preload, slip, bearing and geometry
Protection
Exposure, coatings, inspection and replacement
Product specifications
Related Steel Component Requirements
Translate project requirements into specific products and supply stages.
High-Strength Fastener Bar
Consistent Installation Preload
Alloy bar for buyer-specified structural fasteners. Property class, thread manufacture, coating friction, assembly surfaces and installation procedures should meet the connection's intended clamping force requirements.
- Inputs
- Preload and slip-resistance design intent, bolt and pin interfaces, pin-to-bore tolerances and installation fits.
- Supply
- Material route → heat treatment → machining allowance confirmation.
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 production route
- 02
Heat Treatment
- 03
Peeling or rough machining
- 04
Thread or pin machining
- 05
Specified NDT and dimensional checks
- 06
Protection and packing
INSPECTION & RECORDS
Confirm Inspection
Before Production.
Before production, agree the test scope, sampling locations, inspection stages, acceptance criteria, marking and release records.
Inspection items
Material & Properties
Bar heat number or product batch, material properties and project-specified tests. Confirm heat identification, mechanical properties and impact testing where specified.
Internal & Surface Quality
Confirm surface checks, specified testing and acceptance by product type, including UT or other specified NDT against the criteria stated in the order.
Dimensions & Records
Bar diameter, length, threads, accessory interfaces and delivery records. Check diameter, straightness, thread or pin dimensions and machining allowances.
Order standards and documentation
REFERENCE & ORDER BASIS
Standards for Your Order
Use the approved drawings, project specification, inspection plan and stated editions of the standards.
EN 1993 Bridge Fatigue Context
Steel bridge and fatigue design context; owner specifications govern procurement.
Open ReferenceRCSC High-Strength Bolted Joints
Structural joint design, installation and inspection context for high-strength bolts.
Open ReferenceFHWA Steel Bridges
US bridge references for fatigue, fracture, fasteners, inspection and quality.
Open Reference
ACCESSORIES
Connection and anchorage accessories
Connection, anchorage, installation and protection components matched to your project list.
Coordinate bar connections and end anchorage around one set of interface requirements.
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.
Confirm accessories for end recesses, positioning and protection.
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.
Fibre-Reinforced Nylon End Caps
Match the end geometry, connection and protection requirements.
Confirm grouting and protective materials against the project protection system.
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.
Installation, protection and delivery checklist
End Installation Accessories
PT bar pocket formers, pocket former spacer nuts, duct collars and trumpets.
Add to Project EnquiryAnchorage Zone Accessories
Anchorage zone helical reinforcement and fibre-reinforced nylon end caps. Confirm dimensions and installation interfaces against project drawings.
Add to Project EnquiryGrouting & Corrosion Protection
Cement grout, wax, heat-shrink sleeves and corrosion protection materials. Confirm compatible accessories for the service environment.
Add to Project Enquiry- Project Drawings
- Product Selection
- Accessory List
- Inspection Review
- Packing & Delivery
Application and processing references
Define the supplied parts
Specify the grade and delivery condition, bar dimensions, threads and mating parts. Agree inspection, identification, protection and packing for the order.
Explore bar options ↗ Connection parts ↗Context image credits: Laurel Fork bridge construction, NPS Photo (public domain; cropped). Binondo–Intramuros Bridge, Ranieljosecastaneda, CC BY-SA 4.0 (cropped and resized; this adapted photo remains under the same license). Rail context and actual sleeve photograph retained from JOTAIN’s existing application assets.
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Bridge component purchasing questions
How do bridge hanger rods differ from post-tensioning bars?
Hanger and tension rods connect exposed structural members through their end fittings. Post-tensioning bars are specified with their own couplers and anchorage details. Treat them as separate component families and identify the required route in the enquiry.
Can bars and matching connection parts be ordered together?
The listed supply routes include bars and connection or anchorage parts. Provide the mating drawings so thread form, pin and fork dimensions, engagement lengths and bearing faces can be reviewed together. Compatibility with an existing proprietary system requires specific confirmation.
What should I include in an initial enquiry?
Send the component list and quantities, drawing reference and revision, key dimensions, material and delivery condition, required inspection records and delivery destination. For threaded or pinned connections, include the mating-part dimensions.
Which inspection and traceability records should be agreed?
Agree the applicable material specification, dimensional checks, any required NDT, certificate type and batch identification before production. Specify which records must link the supplied bar or component to its heat and processing batch.
Do published bar ranges qualify a complete bridge or PT system?
No. Published round-bar ranges describe material supply routes. Component acceptance, fatigue requirements and approval of the complete connection or post-tensioning system remain governed by the project specification.
Discuss your project
Send your requirements directly to JOTAIN. We will reply to your email.
Drawing reference and revision, component list and quantities. Bar diameter and length; thread form, pitch and mating dimensions. Grade, delivery condition, protection and required inspection records. Delivery destination, requested schedule and packing requirements.