APPLICATIONS / WIND ENERGY
Wind foundations. Anchor bars & fittings.
Anchor bars, threaded components and post-tensioning supply for wind-energy foundations and towers.
Foundation anchorage concept. Concrete is cut away to reveal the bar connections. Select a product to explore its supply route.
OUR SUPPLY
From bar to connection.
Anchor & holding-down bars
Anchor bars
- Heat-treated bar and prepared ends for the specified anchor assembly.
Raw or heat-treated bar, cut lengths and prepared threaded ends.
Bolting & connection material
Anchor nuts
- Mating threads and bearing faces coordinated with the anchor bar.
Washers & bearing parts
- Flat washers and project-specified spherical bearing options.
Bearing plates
- Drawing-defined plates and holes for the specified bearing detail.
Couplers
- Internal threads matched to the chosen bar and engagement length.
Fastener bar, shear connection bars and drawing-defined machining.
PT bars & accessories
PT end protection
- Protective end caps selected for the specified PT anchorage.
Anchorage-zone reinforcement
Duct collars / trumpets
Pocket formers
Smooth end-threaded, fully threaded and cold-rolled bar routes. Couplers, nuts, plates and washers matched to the selected system.
For concrete post-tensioning
Selected installation accessories, shown separately from the foundation anchor cage.
See the accessory range
Couplers · nuts · bearing plates · flat and spherical washers · spherical hex nuts · prepared ends · anchorage-zone reinforcement · pocket formers · spacer nuts · duct collars · end caps · grouting and protection materials.
Accessory selection follows the product route and project drawings. These are separate options, not a single universal assembly.
Shaft & pin blanks
Heat-treated, peeled or rough-machined blanks with the agreed machining allowance.
Application and processing references
IN THE FIELD
Foundation anchorage and wind-farm construction.
Foundation anchorage
Anchor-cage assembly in a foundation excavation.
Wind-farm construction
The wider installation and construction setting.
Bars on site
Prepared anchor bars laid out before assembly.
THE CORE BAR ROUTE
Long bars. Prepared for the connection.
Raw or heat-treated anchor bars, cut lengths and prepared ends.
Confirm thread, nut and bearing interfaces together.
Review anchor-bar supply ↗MATERIALS & RELATED PRODUCTS
Steel grades and related components.
42CrMo4 / 4140, 34CrNiMo6 and 35CrMo are candidate bar routes for technical review. The ordered standard, section and properties define the material choice.
Fatigue, preload & mating interfaces
Review the load spectrum, maintained preload, thread geometry, temperature and protection together. Define the inspection scope and sampling locations against the approved project specification.
Technical data & order requirements
Send your drawing, quantity and destination.
Open current technical information ↗Order and delivery sequence
Match the project list
Dimensions, threads and interfaces
Acceptance and traceability
Marking, protection and shipment
PROCESSING & EVIDENCE
From the bar to the delivery record.
Request a quote for anchor bars and fittings.
Share the drawing, product list and delivery requirements.
Material specifications, connections and inspection
Materials and technical information
PUBLISHED BAR SUPPLY RANGE
Candidate Bar Materials & Supply Ranges
Bar materials for anchors, fasteners and shafts. Select the grade for the section size, required properties, fatigue loading and approved 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 prepared blank
- Possible applications
- Common high-strength, hardenable route for load-bearing parts.
- Application Limits
- Final suitability depends on section size and project requirements; cross-standard substitutions need verification.
34CrNiMo6
Material properties and dimensions
- Standard
- 34CrNiMo6; verify any proposed SAE 4340 substitution
- Supply / Processing
- Hot rolled / forged / machined
- Delivery Condition
- QT or forged route
- Possible applications
- A higher-hardenability and toughness route for heavy sections.
- Application Limits
- Use only when the purchaser’s specification permits it.
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 thread-ready
- Possible applications
- Candidate fastener and threaded-component route.
- Application Limits
- Fastener class and assembly performance remain purchaser-defined.
Product specifications and interfaces
Specifications to Confirm
Foundation Anchor Bolts
Coordinate anchor-rod threads with the cage geometry.
Wind turbine foundation anchor bolts and prepared anchor-rod material are supplied for purchaser-designed foundation assemblies. Cyclic tension, maintained preload, thread-root geometry and transition details take priority over a static strength value alone.
- Supply
- Raw or heat-treated bar, thread-ready preparation, cut lengths and identity marking; complete cage design remains purchaser-defined.
- Interfaces
- Thread system, nuts and couplers, foundation template geometry, straightness, erection tolerance and protection zones.
- Acceptance
- Load spectrum, preload and fatigue requirements; heat identity, mechanical results, thread and dimensional records, and specified NDT.
Holding-Down Bars
Align the embedded and exposed lengths.
Structural anchor bars and high-strength holding-down bars form part of the foundation anchorage range. Confirm the approved material, finished geometry and end interfaces for the project rather than treating an anchor-bar family as a completed foundation system.
- Geometry
- Overall length, embedment, projection, thread length and end transitions.
- Connections
- Nut and bearing interfaces, template fit, installation space and dimensional tolerances.
- Order basis
- Material and target properties, coating route, identification, tests and delivery quantities.
Shear Connection Bars
Confirm the connection from its drawing.
Shear key bars and shear connection bars are available within structural anchor and foundation products. Supply follows the specified bar shape, dimensions, material and connection detail; the engineer defines the shear-transfer mechanism and acceptance requirements.
- Scope
- Shear key bars / shear connection bars to the purchaser’s drawing; no standard connection capacity is implied.
- Geometry
- Diameter or section, finished length, end preparation, embedment and installation interfaces.
- Inputs
- Design connection, material specification, tolerances, protection, inspection and quantity.
High-Strength Fastener Bar
Specify the installed pretension.
Alloy-steel bar routes support purchaser-specified bolting and stud manufacture. Property class, thread manufacture, nut pairing, coating friction and installation method must achieve the specified preload while controlling relaxation.
- Supply
- QT or peeled bar and machining allowance; fastener properties follow the full manufacturing and assembly specification.
- Inputs
- Property class, nut pairing, thread route, coating or lubricant condition and installation method.
- Records
- Delivery condition and mechanical results, thread-gauge records, identity marking and ordered finish checks.
Shaft & Pin Blanks
Check toughness through the controlling section.
Heat-treated, peeled or rough-machined shaft and pin blanks are supplied for heavy rotating or articulated parts. The controlling section, service temperature, impact requirement and internal-soundness acceptance govern the material route.
- Supply
- Forged or rolled route, QT condition, machining allowance and UT when specified.
- Inputs
- Finished geometry, heat-treatment section, minimum temperature, load duty, test location and NDT acceptance.
- Records
- Heat-treatment lot identity, section-relevant mechanical results, dimensional report and specified UT record.
Couplers, Nuts & Ends
Maintain full mating-thread engagement.
Drawing-defined couplers, nuts and prepared ends are supplied to agreed dimensions and acceptance criteria. Thread form, class, handedness, engagement length and protective finish must remain compatible across all mating components.
- Supply
- Machining, the agreed thread route and protective finish when specified.
- Inputs
- Thread standard, size, class, handedness, minimum engagement, mating geometry and finish allowance.
- Records
- Gauge plan, dimensional and engagement records, component marking and finish inspection.
Post-Tensioning Bars
Post-tensioning for wind-energy concrete structures
We supply smooth, fully threaded and cold-rolled fully threaded steel bars with anchorage, installation, grouting and protection accessories for wind-energy concrete structures. 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 and operating conditions
SUPPLY SCOPE
Anchor-bar supply and
engineering responsibilities
JOTAIN supplies foundation anchor bars and bolts, structural connection bars, bolting material, processed fittings, shaft and pin blanks, and PT products against the purchaser’s project requirements.
- Our scope
- Confirmed bar and component supply, material condition, end preparation, dimensions, specified protection, inspection, traceability and delivery records.
- Engineering team
- Foundation and tower design, fatigue spectrum, target preload, member and connection capacities, template and erection geometry, installation method and final acceptance.
ENGINEERING REQUIREMENTS
Specify Fatigue, Preload & Interfaces
Wind-foundation procurement follows the purchaser’s load spectrum, service environment and approved connection details.
Loading
Cyclic tension, preload and relaxation
Environment
Service temperature and exposure
Material Route
QT requirements for the section size, and thread preparation
Verification
Heat identity, properties, geometry and NDT
Product specifications
Wind Foundation Conditions
Review the threaded load path and the actual controlling section together.
Loading & Preload
Thread-root fatigue needs explicit inputs
The purchaser’s fatigue and preload model defines the material review. Cyclic tension, maintained preload, thread roots and transition details must be considered beyond static strength alone.
- Inputs
- Design load spectrum, target preload, preload loss or relaxation criteria, thread-root detail and connection stiffness.
- Checks
- Material condition, thread manufacture, nut pairing, coating friction, installation method and ordered test results.
Temperature & Protection
Match toughness and finish to service
Minimum service temperature and exposure affect impact toughness and protection. Section size and the heat-treatment route influence mechanical acceptance.
- Inputs
- Minimum service temperature, corrosion category, controlling section and impact-test requirements.
- Process
- Confirm coating-related hydrogen risk, post-process controls, protective finish and packing.
Mating Interfaces
Coordinate threads, template geometry and erection tolerances
Thread, nut, coupler and foundation template geometry must be compatible. Finish allowance must retain minimum engagement and assembly fit.
- Interfaces
- Thread standard, size, class and handedness; nut and coupler engagement.
- Acceptance
- Straightness, finished length, template and erection tolerances, gauge plan and component identification.
Processing, inspection and delivery
PROCESSING & DELIVERY
From Approved Material to Delivery
Processing follows the selected bar or machined component.
- 01
Bar or Forging Route
- 02
Heat Treatment
- 03
Peeling & Rough Machining
- 04
Thread Preparation
- 05
Specified Protection
- 06
Inspection & Packing
INSPECTION & RECORDS
Confirm Inspection
Before Production.
Before production, agree sampling, tests, inspection stages, acceptance, marking and release records.
Inspection items
Material Identity
Heat-number traceability, chemical analysis and delivery-condition records.
Mechanical Acceptance
Tensile and hardness tests, impact testing when specified, and test locations defined by the order.
Geometry & Integrity
Thread and dimensional inspection, straightness, and UT or other NDT when specified.
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.
IEC 61400-6
Tower and foundation design context; purchaser and OEM requirements control material procurement.
Open ReferenceISO 898-1
Fastener-property context within the standard’s stated dimensional and temperature scope.
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.
Foundation Nuts & Bearing Plates
ANCHOR-END INTERFACES
Confirm thread fit, bearing surfaces, holes and installation geometry.
Couplers
THREADED CONNECTIONS
Confirm standard, class, handedness and minimum engagement.
Prepared Ends
BAR-END PROCESSING
Confirm threads, transitions, finish allowance and end protection.
Shear Key Bars / Shear Connection Bars
STRUCTURAL CONNECTIONS
Confirm the specified geometry and shear-transfer interface against the project drawing.
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.
Installation, protection and delivery checks
INSTALLATION & PROTECTION
From Anchor Cage to Installed Preload
Coordinate the material, thread system, template and surface protection with the purchaser’s foundation design.
Foundation Geometry
Confirm anchor-rod lengths, embedment, projection, thread lengths and the foundation template. Include holding-down and specified shear-connection details, straightness and erection tolerance.
Add to Project EnquiryBolting & Mating Parts
Confirm thread standard and class, nut and coupler engagement, property class, coating friction or lubricant and installation method. The project defines target preload and relaxation limits.
Add to Project EnquiryProtection & Concrete Interfaces
Review minimum service temperature, exposure, coating-related hydrogen risk and protective packing. For PT supply, confirm anchorage, grouting and protection compatibility with the design.
Add to Project Enquiry- Project Drawings
- Product Selection
- Accessory List
- Inspection Review
- Packing & Delivery
Discuss your project
Send your requirements directly to JOTAIN. We will reply to your email.