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Since 2002

PNE® ES-6660 Loose Hooked-End Steel Fiber
PNE® ES-6660 loose hooked-end steel fiber for concrete reinforcement, designed to enhance crack resistance and structural durability in high-performance applications.

PNE® ES-6660

Loose Hooked-End Steel Fiber

Steel Fibers for Concrete Reinforcement

Since 2002, we have specialized in concrete crack resistance, waterproofing, and anti-corrosion technologies.

High-Performance Loose Hooked-End Steel Fiber | PIONEER®
Steel Fibre Reinforcement Solution for Durable Concrete

PIONEER® loose hooked-end steel fibres provide high-tensile reinforcement designed to improve crack control, flexural strength, and long-term durability in steel fiber reinforced concrete (SFRC), tunnel shotcrete, precast elements, and industrial flooring.
Their loose, non-glued form ensures fast, uniform dispersion, offering a cleaner, more efficient alternative to glued steel fibers.

What Is PIONEER® Loose Hooked-End Steel Fibre?

PIONEER® PNE® ES-6660 loose hooked-end steel fibers are non-glued, cold-drawn steel fibre reinforcements designed for SFRC and UHPC.
Unlike glued or bundled fibers, the loose end-hooked design delivers:

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  • Immediate dispersion during batching

  • Superior anchorage & pull-out capacity

  • Mechanical interlock through optimized hook geometry

  • Reliable crack resistance in both early and hardened stage

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This makes them ideal for:
industrial floors, tunnel shotcrete, pavements, precast segments, bridge decks, and warehouse slabs where high toughness and load transfer performance are required.

Cuts Rebar Requirements

Reduces Crack Propagation

PNE® ES-6660 hooked-end steel fiber reduces crack propagation and cuts rebar requirements in reinforced concrete structures.

International Standards Compliance for Steel Fibre Reinforced Concrete

PIONEER® steel fibres comply with global standards to ensure consistent, reliable performance in steel fibre reinforced concrete:

  • ASTM A820 – Standard Specification for Steel Fibers for Concrete Reinforcement

  • ASTM C1116 – Standard Specification for Fiber-Reinforced Concrete and Shotcrete

  • EN 14889-1:2006 – Fibres for Concrete, Part 1: Steel Fibres

All PIONEER® steel fibres—including loose hooked-end types—meet global SFRC compliance requirements, ensuring structural reliability and performance consistency in industrial, precast, and infrastructure applications.

Technical Specifications of Loose Hooked-End Steel Fibers

Discover how PIONEER® loose hooked-end steel fibers enhance SFRC and UHPC with superior durability and crack control:

  • Material: High-tensile steel

  • Type: Hooked-end, loose steel fibre

  • Specific Gravity: 7.8 g/cm³

  • Length: 50 mm, 60 mm (custom lengths available)

  • Diameter: 0.9 mm

  • Aspect Ratio: 40–60

  • Tensile Strength: 1000–1360 MPa

  • Modulus of Elasticity: 200 GPa

  • Color: Metallic gray

These technical parameters define the high mechanical performance of PIONEER® loose hooked-end steel fibers in SFRC, UHPC, precast, and industrial concrete applications.

Uniform spread of PNE® ES-6660 hooked-end steel fiber in concrete mix ensures optimal strength and consistent performance across large-scale projects.

Uniform fiber spread for optimal strength

PNE® ES-6660 steel fiber provides heavy load tolerance and long-term durability for industrial concrete surfaces in ports, warehouses, and transportation hubs.

Heavy load tolerance

Key Benefits of Using Loose Hooked-End Steel Fibre in Concrete

Unlock advanced concrete performance and cost-efficiency with PIONEER® steel fibre reinforcement:

  • Superior Crack Control: Effectively manages plastic and drying shrinkage cracking in SFRC and UHPC.

  • Enhanced Flexural Strength: Increases post-crack load capacity, impact resistance, and fatigue durability.

  • Efficient Dispersion: Loose form ensures immediate, even distribution during batching without clumping.

  • Reduces Rebar and Mesh Use: Simplifies construction workflows while saving labor and material costs.

  • Durability in Harsh Environments: Corrosion-resistant steel fibres extend service life even under aggressive conditions.

  • Compatible with High-Performance Concrete: Ideal for SFRC, UHPC, and shotcrete requiring high tensile and flexural reinforcement.

Applications of Steel Fibre Reinforced Concrete

PIONEER® loose hooked-end steel fibres are widely used in demanding SFRC applications requiring high flexural toughness, impact resistance, and structural reliability:

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  • Industrial floors & heavy-duty warehouse slabs

  • Shotcrete for tunnels, slopes, mines（loose steel fibers for tunnel shotcrete）

  • Slab-on-ground & pavements

  • Precast pipes, panels, tunnel segments

  • Jointless floors, bridge decks & overlays

  • UHPC/RPC members requiring high tensile reinforcement

Hong Kong-Zhuhai-Macao Bridge constructed with polypropylene macro fiber-reinforced shotcrete for enhanced crack resistance and durability in marine environments

Hong Kong-Zhuhai-Macao Bridge

Da Nang Pier in Vietnam built with steel fiber-reinforced concrete for superior tensile strength, impact resistance, and long-term durability in harsh marine conditions

Da Nang Pier, Vietnam

Hangzhou Olympic Center constructed with polypropylene microfiber-reinforced concrete to prevent plastic shrinkage cracking and ensure smooth architectural surfaces

Hangzhou Olympic Stadium

Usage Guidelines for Optimal Fibre Reinforcement

To achieve optimal performance in SFRC and UHPC, follow these guidelines:

  • Dosage: 15–45 kg/m³ depending on required toughness and design loading

  • Mixing: Add fibres after aggregates; mix 3–5 minutes for full dispersion

  • Placement: Suitable for pumping, casting, spraying

  • Finishing: Standard tools can be used; visible fibre tips do not affect performance

Custom Steel Fiber Packaging Options

PIONEER® provides multiple packaging options to support efficient construction workflows:

  • Water-soluble paper bags (5，10 kg) — direct addition into mixers

  • Carton boxes — easy site handling

  • Bulk packaging — for large-scale industrial or precast operations

Learn more about Micro Synthetic Fibers

Discover How PIONEER® Can Strengthen Your Concrete Projects >>

Why Choose PIONEER® as Your Concrete Fiber Supplier

Partner with a direct manufacturer with over 22 years of expertise in synthetic fiber reinforcement for concrete and mortar.

22 Years of Expertise in Fiber Reinforcement

PIONEER® provides consistent, high-performance fibers that ensure long-term success in concrete slabs, precast elements, industrial floors, and critical infrastructure projects, making us a trusted supplier in the global market.

1,000+ Projects in 20+ Countries

Our fibers are applied in major projects, including the Hong Kong-Zhuhai-Macao Bridge, Bangladesh Subsea Tunnel, Walmart Superstores, and metro systems, demonstrating our proven capability in fiber-reinforced concrete and mortar applications.

Direct Manufacturer, One-Stop Service

We provide complete technical support, including dosage optimization, mix design consultation, and on-site application guidance to ensure your projects succeed with fiber-reinforced concrete and mortar.

PIONEER® factory office building in Nanjing showcasing the company's headquarters and administrative facilities.

PIONEER® Headquarters

Aerial view of PIONEER® production facility in Nanjing, showcasing the company's modern factory and large-scale concrete fiber manufacturing capabilities.

26,500m² production base

Synthetic fibers manufacturing production line for fiber reinforced concrete, producing concrete fibers and fiber mesh reinforcement to reduce cracks and improve durability.

Advanced fiber dispersibility

Concrete fibers production line manufacturing reinforcement fiber for concrete and improving fiber reinforced concrete performance.

Exceptional tensile strength

Read Our Expert Insights，Discover More in Our Blog >>

FAQ

  • The hooked-end geometry provides strong mechanical anchorage, allowing the fibers to effectively bridge microcracks as they form. This restricts crack width, increases flexural toughness, enhances residual strength, and helps the concrete maintain load-bearing capacity even after initial cracking.

  • Yes. Loose hooked-end steel fibers can be used as a complementary reinforcement system alongside welded wire mesh or rebar. When combined, the fibers provide distributed micro-crack control while the traditional reinforcement handles major structural loads. This hybrid system is common in slabs-on-ground, pavements, and tunnel linings to achieve improved toughness and reduced shrinkage cracking.

  • Loose steel fibers slightly reduce the slump of fresh concrete, but the effect is manageable by adjusting water-reducing admixtures. Because the fibers are not glued, they disperse quickly and do not significantly increase mixing resistance. Using a well-graded aggregate and a proper superplasticizer ensures smooth placement and finishing.

  • Distribution quality can be inspected through core sampling, section cutting, or CT scanning (for UHPC applications). A uniform fiber orientation and concentration indicate proper mixing.

  • Loose steel fibers are fully compatible with both pumping and spraying. Their free-dispersion nature minimizes clogging in pipelines and helps maintain steady flow during shotcrete application.

HPM® PP

Why Choose Us?

Proven Expertise & Greater Savings

22 years of focus

on fiber reinforcement solutions.

5,000 tons yearly

from advanced manufacturing.

20+ countries served

with global product distribution.

1,000 projects proven

 in diverse applications worldwide.

Looking for a Quote or More Information about Our Fibers?

At PIONEER, we’re committed to delivering the best and most relevant information to support your needs. Reach out to us for more details and discover the benefits we offer:

  • Factory-Direct Pricing

  • Expert Guidance on Fiber Applications

  • Customized Solutions for Your Project

  • Fiber Samples Available for Testing

Privacy Assurance: We respect your privacy and will never share your information. 

PIONEER® engineers provide technical guidance at the construction site

Have Any Questions?
Get in Touch with Us Now!

Contact Us

For product inquiries, OEM/ODM partnerships, or becoming a distributor: Sales@pioneerfibre.com

For technical support and application guidance: Support@pioneerfibre.com

Regional WhatsApp Support

​We typically respond within 24 hours, ensuring your project continues without delays.

  • Americas: +1 (702) 307-8327

  • Europe: +86 151 6240 5106

  • Middle East & Africa：+1 (949) 317-7180

  • Asia-Pacific：+86 190 1543 5408

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