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Product Description
As a premier manufacturer and direct supplier of heavy-duty infrastructure components, we introduce the L-Shape Screw M16/M20, engineered specifically for securing steel deck panels to transoms. This specialized fastener delivers uncompromising structural integrity without the need for destructive drilling or welding.
Directly sourced from the manufacturer for optimized procurement efficiency
Innovative top-side installation eliminates under-deck access requirements
Perfectly suited for securing thick steel deck panels (≥12 mm)
Forged from high-strength steel with advanced anti-rust surface treatments
The L-Shape Screw represents a paradigm shift in structural fastening, specifically engineered to seamlessly secure steel bridge deck panels to underlying I-beam transoms. When handling these fasteners, the substantial weight and smooth, anti-rust coated finish immediately communicate industrial-grade durability and meticulous craftsmanship. Unlike traditional U-bolts that demand cumbersome under-deck access and time-consuming manual adjustments, this specialized 90-degree hook fastener is designed entirely for intuitive top-down operation. The hot-forged medium carbon and alloy steel composition delivers exceptional tensile strength, while the localized quenching at the hook ensures it grips the bottom flange of the transom with unyielding rigidity. By eliminating the necessity for drilling or welding, it preserves the absolute structural integrity of the transom, preventing any section weakening or dangerous stress concentrations. Whether deployed in emergency rescue bridges, military floating structures, or heavy temporary trestles, the tactile engagement of rotating the screw 90 degrees to lock it into place, followed by the firm resistance of tightening the nylon lock nut to a precise 300 N·m torque, provides engineers with immediate assurance of a rock-solid, vibration-resistant connection. In steel grating decks, the sleek profile allows the screw to pass cleanly through grating gaps without interfering with the walking surface, ensuring a flush, hazard-free pedestrian or vehicular experience.
Product Name | L-Shape Screw / L-Shape Hook Screw |
|---|---|
Thread Size | M16 / M20 |
Head Shape | 90° L-shaped hook |
Main Material | Medium carbon or alloy steel |
Production Process | Hot-forged + overall heat treatment (local quenching at the hook) |
Surface Treatment | Anti-rust coating |
Applicable Deck Thickness | ≥12 mm |
Recommended Installation Torque | ≈ 300 N·m (for M20) |
Supporting Fasteners | Flat washer, spring washer, nylon lock nut (for vibration environments) |
Contact Surface Design | Hook contact surface can be customized with serrations (anti-slip design) |
Installation Method | Single-side (top) installation on the deck, 90° rotation lock |
Installation Features | No drilling, no welding, supports low-temperature environment operations |
Our L-Shape Screws are engineered to resolve the most persistent challenges faced by structural engineers and construction crews during bridge assembly and maintenance. By focusing on operational fluidity and long-term resilience, these fasteners transform complex installations into streamlined, predictable processes.
Zero-Drilling Preservation: Completely eliminates the need to drill holes into the transom, safeguarding the structural cross-section from weakening and preventing localized stress fractures.
Rapid Top-Side Deployment: All installation steps are executed from above the bridge deck, drastically reducing labor hours and eliminating the need for dangerous under-bridge scaffolding.
Vibration-Resistant Locking: Paired with flat washers, spring washers, and specialized nylon lock nuts, the assembly maintains its clamping force even under the relentless high-frequency vibrations of heavy traffic.
All-Weather Reliability: Since the installation process requires zero welding, these fasteners can be reliably deployed in extreme sub-zero temperatures where traditional welding would fail or be strictly prohibited.
Unobtrusive Profile: Designed to integrate flawlessly with steel grating, the threaded shaft passes through standard gaps without protruding dangerously above the walking or driving surface.
The foundation of any reliable structural connection lies in its metallurgical integrity and manufacturing precision. We utilize premium-grade medium carbon or alloy steel, subjecting each piece to a rigorous hot-forging process that aligns the grain structure of the metal to follow the crucial 90-degree bend of the hook. This meticulous craftsmanship ensures the fastener can withstand immense axial loads without deformation.
Targeted Quenching: The hook portion undergoes a specialized localized quenching heat treatment, drastically amplifying its wear resistance and anti-bending capabilities where it contacts the transom flange.
Advanced Anti-Rust Coating: Every screw is enveloped in a resilient anti-rust layer, providing a formidable barrier against moisture, road salts, and harsh outdoor climates, thereby guaranteeing an extended operational lifespan.
Customizable Grip: For environments demanding maximum security, the contact surface of the hook can be precision-machined with serrations, creating an aggressive anti-slip bite against the steel beam.
Installation Method Recommendation
Time is a critical metric in infrastructure deployment, particularly for temporary trestles, emergency rescue pathways, and military assault bridges. The L-Shape Screw completely disrupts the traditional, labor-intensive methods associated with U-bolts, offering a streamlined workflow that empowers a single operator to achieve rapid, secure fastening.
Single-Operator Feasibility: The intuitive design allows one worker to drop the screw through the deck hole, rotate it exactly 90 degrees to engage the bottom flange, and torque it down—all without requiring a second pair of hands below the deck.
Accelerated Dismantling: For construction trestles that move concurrently with excavation faces, the ability to quickly loosen the top nut and disengage the hook makes frequent deck removal and replacement highly efficient.
Independent Panel Replacement: Facilitates localized repair of damaged steel deck panels. Crews can unfasten and lift a single panel independently without disturbing adjacent sections or the underlying framework.
In heavy-duty load-bearing applications, the certainty of your fastening system is non-negotiable. Our L-Shape Screws are meticulously engineered to deliver unwavering clamping force, pulling the thick steel deck panels downward against the transom with immense axial pressure to create a unified, rigid structure.
High Torque Capacity: Designed to comfortably handle a specified tightening torque of approximately 300 N·m (for the M20 variant), ensuring the deck remains firmly anchored under extreme dynamic loads.
Dynamic Load Resilience: The integration of nylon lock nuts specifically addresses the threat of fastener back-off caused by the continuous, heavy vibrations of commercial or military vehicles traversing the deck.
Flange Protection: By hooking under the bottom flange rather than piercing it, the fastener distributes the clamping force evenly, preventing the micro-cracking often associated with drilled or welded joints.
Infrastructure projects often present unique environmental and spatial constraints. The L-Shape Screw is a highly adaptable solution, engineered to perform flawlessly across a diverse spectrum of challenging scenarios where conventional fastening methods fall short.
Heavy-Duty Compatibility: Specifically optimized for thick deck panels (≥12 mm), steel chequer plates, and heavy steel grating decks utilized in rapid-erection temporary bridges.
Restricted Clearance Solutions: Serves as the perfect alternative to traditional U-bolts in situations where limited deck height or tight clearances make standard hardware impossible to install.
Galvanized Structure Safe: The ideal fastening method for securing panels to galvanized transoms, where welding is strictly prohibited due to the destruction of the zinc coating and the release of toxic fumes.
Experimental & Adjustable: Frequently utilized in experimental bridge setups where engineers require the ability to easily and repeatedly adjust the deck clamping preload for testing purposes.
Procuring critical structural components demands absolute confidence in the source. Operating directly from our expansive production base in Zhenjiang, Jiangsu, we specialize exclusively in the manufacturing of bailey bridges and comprehensive steel structural components. Our facility is a testament to industrial precision and rigorous quality assurance.
Certified Excellence: Our entire manufacturing ecosystem operates under strict ISO9001 certification, ensuring every production phase meets rigorous international quality management standards.
Traceable Materials: We maintain absolute transparency. Every batch of L-Shape Screws can be supplied with comprehensive material certificates, detailed test reports, and official quality certificates.
National Standard Compliance: All products are meticulously engineered and tested to meet or exceed demanding national standards for structural steel fasteners, ensuring reliable performance in the field.
We recognize that supplying premium hardware is only one facet of a successful infrastructure project. We partner with our clients to provide an end-to-end engineering ecosystem, ensuring that from the initial blueprint to the final torque application, your team is fully supported by seasoned structural experts.
Customized Design Services: Our engineering department provides complimentary structural calculations, detailed CAD drawings, and bespoke customization to ensure the fasteners perfectly match your specific transom and deck profiles.
Comprehensive Documentation: Every order is backed by exhaustive installation guides, detailed operational manuals, and clear instructional videos to guarantee flawless execution by your construction teams.
On-Site & Remote Guidance: We offer 24-hour responsive after-sales service and, for complex erections, can deploy experienced supervisors for on-site installation guidance to ensure absolute structural integrity.
Selecting the right partner for structural components dictates the safety, speed, and financial efficiency of your entire project. We bridge the gap between premium manufacturing and dedicated project support, delivering solutions that empower your engineering teams to build with absolute confidence.
Unmatched Production Focus: Unlike general fastener suppliers, our production lines are entirely dedicated to bridge and heavy structural components, granting us unparalleled domain expertise.
Streamlined Supply Chain: By eliminating intermediaries, we provide direct access to our manufacturing floor, ensuring rapid lead times, transparent communication, and highly competitive procurement economics.
Holistic Project Partnership: We do not just ship components; we study your erection site drawings and surrounding areas to recommend the most efficient, safe, and logical installation procedures for your specific environment.
Are you a manufacturing facility or a trading entity?
We are a direct manufacturer headquartered in Zhenjiang, Jiangsu. We own and operate our own dedicated production base and specialized manufacturing lines focused entirely on bailey bridges and heavy structural parts, ensuring direct quality control and efficient supply.
What encompass your primary product lines?
Our core manufacturing capabilities cover the SJ-200 Steel Bridge, SJ-321 Bailey Bridge, bailey panels, chords, frames, heavy-duty deck panels, specialized pins, high-strength bolts (including the L-Shape Screw), and a full suite of steel structural components.
Do you have the capability to supply customized structural designs?
Absolutely. We maintain an in-house engineering team that provides complimentary structure calculations, detailed technical drawings, and full customization services to ensure our components integrate perfectly with your specific project requirements.
What specific certifications and quality documentation do you provide?
Our facility has achieved full ISO9001 certification, and all our products strictly adhere to national structural standards. Upon request, we provide comprehensive material certificates, rigorous laboratory test reports, and official quality assurance certificates for every shipment.
How do you support the actual erection and installation process?
We provide extensive installation support, including detailed technical drawings, step-by-step manuals, and instructional videos. For complex projects, we offer on-site supervision services. Furthermore, we mandate that an experienced construction team undertakes the erection. Based on site drawings, we recommend a precise, multi-step installation procedure—from assembling bilateral bailey panels and bridge bearings with a lorry-mounted crane, to installing transoms, sway bracing, and decking in a calculated sequence to maximize structural stability during construction.
