Over the past 50 years, fully threaded, high-strength threaded bar and multi-strand anchor systems with corrosion protection have developed into the most accepted and highly reliable ground anchorages available. As the leading steel supplier in the United States’ foundation industry, Nucor Skyline manufactures the most extensive selection of cold rolled and hot rolled, high-strength, fully threaded bars at multiple locations throughout the United States.
Threaded bars are offered in both 80 ksi and 150 ksi steel grades, in sizes ranging from #14 to #32 (cold rolled), and in Grade 80 with sizes ranging from #6-#20 (hot rolled). Cold rolled, high-strength Grade 150 ksi bars are offered in diameters of 1 ¼ to 3 inches. Bars are manufactured to a maximum single length of up to 60 feet.
The fully-threaded bar can be cut and coupled in the field at any point to allow for job site flexibility. The bars are suitable for many applications that work well with other foundation products. Tie-rods and soil anchors can be utilized in conjunction with sheet pile and other retaining walls. Threaded bar cages are used with casing to make high-capacity drilled shafts. Threaded bars are also used as the main reinforcement component in micropiles.
Our broad range of threaded bar accessories, which can be customized to fit your needs, was designed to perfectly complement our threaded bars and facilitate installation. Couplers, both tap-through and stop-type, are available for all bar sizes and grades. Full load nuts and jam nuts are available in either a hex or a round "collar" style with flats machined onto the outer diameter. All hardware has been designed and tested to exceed the minimum ultimate tensile strength of the bar.
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Threaded Bar Accessories
- Couplers (Tap-through & Stop-type)
- Transition Couplers
- Hex Nuts (Full Load & Jam Nuts)
- Hardened Washers
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- Beveled Washers
- Bearing Plates
- Clevises
- Lifting Eye
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- Ducts, End Caps, Centralizers
- PTI-rated Corrosion Inhibiting Compound
- Grout tube
- Post Grout Systems
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The following additional corrosion protection options are available for all threaded bars:
- Temporary Corrosion Protection (PTI Class II)
- Permanent Corrosion Protection (PTI Class I)
- Grout Encapsulation
- Grease Encapsulation
- Epoxy Coating
- Galvanizing
- Petroleum Wrap Taping
Oversized accessories are provided to accommodate galvanized and coated bars.
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Understanding Threaded Bars: Types, Components, and Materials
Thread Specifications and Standards
As North America's premier steel foundation supplier, Nucor Skyline's threaded bars are manufactured to precise specifications:
- Our cold-rolled and hot-rolled threaded bars are manufactured to meet ASTM A615 Grade 80 ksi standards
- High-strength threaded bars are manufactured to Grade 150 ksi standards
- Threading is precision-engineered for optimal durability and load distribution
- Available in right-hand and left-hand thread configurations to accommodate project requirements
High-Performance Materials
Nucor Skyline offers threaded bars made from high-quality steel formulations to meet diverse project requirements:
- Cold-Rolled High-Strength Steel: Manufactured in diameters from #14 to #32, providing ultimate tensile strength up to 100 ksi
- Hot-Rolled Reinforcing Steel: Available in diameters from #6 to #20, combining excellent workability with high strength also up to 100 ksi ultimate tensile
- High-Strength Alloy Steel: Offered in diameters from 1 ¼ inch to 3 inches, with ultimate tensile strength of 150 ksi
- Corrosion-Protected Options: Available with galvanization, epoxy coating, or specialized encapsulation systems for aggressive environments and permanent applications
All bars undergo rigorous quality control to ensure they meet Nucor Skyline's exacting standards for structural applications in the most demanding environments.
Applications of Threaded Bar Systems
Construction and Structural Support Solutions
Nucor Skyline's threaded bars are important components in foundation and structural applications:
- Foundation Reinforcement: Our threaded bars provide reinforcement for concrete foundations, offering superior tensile strength in drilled shafts, augercast piles, and micropiles
- Retaining Wall Construction: When paired with our steel sheet piling, threaded bars create tie-back and deadman systems for superior lateral support
- Bridge and Infrastructure Support: Engineered to connect and stabilize infrastructure components while maintaining structural integrity under extreme loads
- Seismic Retrofitting: Providing tension reinforcement for structures requiring improved earthquake resistance
Industrial and Heavy Civil Applications
Nucor Skyline's threaded bar systems offer versatile solutions for industrial construction and engineering projects:
- Equipment Anchoring: Secure mounting of heavy machinery and industrial equipment to concrete foundations
- Combined Wall Systems: Grade 80 tie-rod systems in marine structures and bulkheads, capable of withstanding extreme tension forces and offering superior ductile properties
- Earth Retention: Stabilizing excavations and slopes through soil nail and rock anchor configurations, with hollow bars available for specialized simultaneous drilling and grouting applications
- Tower and Mast Foundations: Providing anchoring for wind turbines, transmission towers and elevated structures
Threaded Bars: Engineered Foundation Components
Nucor Skyline's threaded bars represent state-of-the-art foundation technology, serving as versatile connectors and reinforcement elements in demanding construction environments. As your true project partner, we manufacture these precision-engineered components for a wide range of structural applications.
Key Advantages of Nucor Skyline Threaded Bars:
- Superior Load Capacity: Engineered to resist extreme tension forces, with options reaching over 1,250 kips ultimate strength in our largest diameters
- Field Adaptability: Fully threaded design allows for cutting and coupling at any point, maximizing installation flexibility
- Size Range: Available in diameters from 3/4" to 4", supporting diverse project requirements
- Enhanced Corrosion Protection: Multiple protection systems available, including galvanization, epoxy coating, and encapsulation for extended service life
- Domestic Manufacturing: Produced at multiple Nucor Skyline facilities throughout the United States, ensuring consistent quality and reliable availability
Superior Performance in Critical Applications:
- Deep foundation anchoring systems requiring maximum tensile capacity
- High-load tieback systems for major bridge abutments and approach structures
- Primary reinforcement in large-diameter drilled shafts and high-capacity pile foundations
- Permanent ground anchors in dam rehabilitation and major infrastructure projects
High-Tensile Threaded Bars for Demanding Applications
Nucor Skyline manufactures high-strength Grade 150 ksi threaded bars specifically engineered for projects requiring exceptional load capacity and structural performance in ground anchoring. These bars deliver superior tensile strength with ultimate capacities reaching over 1,050 kips in our largest diameters, making them ideal for the most demanding geotechnical and heavy construction challenges.
Geotechnical Solutions with Threaded Bar Systems
As your true project partner, Nucor Skyline provides threaded bar systems that form the backbone of modern geotechnical engineering solutions. Our specialists work with owners, engineers, and contractors to develop optimized threaded bar applications for challenging soil and rock conditions.
Engineered Geotechnical Applications:
- Micropiles: High-capacity foundation elements using threaded bars as primary reinforcement, ideal for low-headroom and limited access sites
- Soil Nail Walls: Cost-effective earth retention systems utilizing our threaded bars with shotcrete facing for slope stabilization
- Rock Anchors: Permanent and temporary rock stabilization systems for tunnels, mines, and rock face protection
- Ground Anchors: Versatile tieback systems with PTI Class I and Class II corrosion protection for temporary or permanent retaining wall applications
Construction Fastening and Anchoring Systems
Nucor Skyline's threaded bars offer unmatched versatility as construction fasteners, providing connections that can be precisely adjusted and secured on-site. Their continuous threading allows for field modifications without compromising structural integrity.
Advanced Fastening Solutions:
- Precision anchoring of steel structures to concrete foundations
- Connections between precast concrete elements in accelerated construction projects
- Field-adjustable bracing and shoring systems for temporary support of excavations
- Custom anchor bolt assemblies for specialized industrial equipment foundations
Structural Reinforcement and Seismic Retrofit
With nationwide manufacturing capabilities, Nucor Skyline delivers threaded bar solutions that enhance structural performance and provide reinforcement in both new construction and rehabilitation projects. Our engineering team works with designers to optimize threaded bar applications for challenging structural conditions.
Strategic Structural Applications:
- Post-tensioned reinforcement systems for concrete structures requiring additional load capacity
- Seismic retrofit anchors providing tension resistance during earthquake events
- Through-bolt reinforcement in historic structure preservation and adaptive reuse projects
- High-capacity Grade 80 tie-rod systems for complex industrial equipment platforms and machine foundations
Frequently Asked Questions
Why are rolled threads important in threaded bar applications?
Nucor Skyline's manufacturing process creates rolled threads rather than cut threads, producing a stronger profile with better fatigue resistance. Rolled threading maintains the material's grain structure and actually work-hardens the steel, increasing its tensile strength. This process eliminates stress concentrations that could lead to failure under cyclic loading conditions.
What is the difference between a threaded rod and a bolt?
A threaded rod is a fully threaded metal bar without a head, designed for tension applications across extended lengths. Bolts have heads on one end and typically shorter threads, requiring nuts for fastening. Unlike bolts, threaded rods can be cut to length and coupled as needed for custom applications.
What materials are Nucor Skyline's threaded bars made of?
Nucor Skyline manufactures threaded bars from high-quality steel conforming to ASTM A615 Grade 80 ksi for standard applications and specialized alloy steel for our Grade 150 ksi high-strength bars. Our domestic manufacturing facilities ensure consistent quality and material traceability across our entire product range.