M2-M25 304 Stainless Steel J-Bolts Concrete Anchors

J Bolts, or Hook Bolts, are typically used for roofing applications. They host a hooked bottom which is designed to hook onto rebar embedded in concrete and threading on the top of the fastener. They are a very common and durable fastener used by construction workers when erecting a new building.

Product Overview

The M2-M25 304 Stainless Steel J-Bolts Concrete Anchors stand as a cornerstone in permanent fastening solutions, engineered to deliver unwavering stability in concrete, masonry, and steel structures. Forged from 304 stainless steel—a premium alloy containing 18% chromium and 8% nickel—these J-bolts excel in environments where corrosion resistance and tensile strength are non-negotiable. Unlike carbon steel alternatives, their composition forms a naturally occurring passive oxide layer that self-heals when scratched, making them ideal for outdoor, marine, and industrial settings prone to moisture, salt, or chemical exposure.

Compliant with ASTM F1554 (Grade 36)—a critical standard for anchor bolts in structural applications—these J-bolts undergo rigorous testing to ensure consistent load-bearing capacity and long-term performance. Whether securing static loads like machinery bases or dynamic loads such as vibrating equipment, their design prioritizes reliability, making them a trusted choice for engineers and contractors across construction, marine, and renewable energy sectors.

Product Specifications

Features

Superior Corrosion Resistance:

The 304 stainless steel composition is the foundation of their durability. Chromium in the alloy reacts with oxygen to form a protective oxide layer, preventing rust and corrosion even in humid or coastal environments. Post-manufacturing, a passivation process removes free iron from the surface, enhancing this protective layer and ensuring the bolts withstand 1,000+ hours of salt spray testing without red rust formation. This makes them indispensable in chemical plants, coastal construction, and wastewater treatment facilities.

High Strength and Reliability:

With a tensile strength of 515 MPa and yield strength of 205 MPa, these J-bolts easily handle heavy loads without deformation. Their signature J-shaped bend is precision-engineered with a 2.5× bolt diameter bend radius—a design that distributes stress evenly across the anchor, minimizing the risk of cracking or failure under dynamic forces. This structural integrity is validated by ASTM F1554 testing, which ensures consistent performance across all size ranges.

Wide Temperature Compatibility:

Operating seamlessly from -50°C to +300°C, these J-bolts thrive in extreme environments. In cold storage facilities, they resist brittleness caused by sub-zero temperatures, while in industrial furnaces or power plants, they maintain strength despite high heat exposure. This versatility eliminates the need for application-specific fasteners, simplifying inventory management for contractors.

Easy Installation:

The fully threaded shank allows for quick integration with nuts and washers using standard tools, reducing installation time. The J-shaped bend creates a mechanical interlock with concrete when embedded, eliminating reliance on adhesives or expansion mechanisms. This design ensures a secure fit even in porous or low-strength masonry, making them suitable for retrofitting projects and new construction alike.

Safety-Compliant:

CE certification guarantees adherence to EU safety regulations, while the 2.5:1 safety factor provides a critical buffer against unexpected overloads—such as seismic activity or equipment malfunctions. Each bolt is visually inspected and load-tested during production to ensure compliance with industry standards, giving end-users confidence in high-risk applications.

Applications

Construction: In high-rise projects, these J-bolts secure steel beams to concrete foundations, ensuring structural stability during earthquakes or high winds. They also anchor precast concrete panels in commercial buildings, streamlining assembly without compromising safety.

Marine Industry: Docks and piers rely on their corrosion resistance to secure pilings and mooring hardware, withstanding constant saltwater immersion and tidal fluctuations. Offshore platforms use them to fasten equipment racks, enduring harsh marine conditions for decades.

Industrial Machinery: Manufacturing plants mount CNC machines, hydraulic presses, and conveyor systems using these J-bolts, preventing vibration-induced movement that could compromise precision. Food processing facilities value their rust resistance, avoiding contamination risks in hygiene-critical areas.

Renewable Energy: Solar farms use them to anchor panel mounting systems to concrete slabs, ensuring stability against wind uplift. Wind turbine foundations rely on their strength to secure tower bases, withstanding rotational forces generated by turbine blades.

Transportation: Railway tracks are anchored to concrete sleepers using these J-bolts, maintaining alignment despite heavy train loads. Highway guardrails use them to attach to concrete barriers, absorbing impact energy during collisions.

In a coastal bridge renovation project, these J-bolts replaced corroded carbon steel anchors, reducing maintenance costs by an estimated 40% over five years. Their resistance to salt spray ensured the bridge’s steel girders remained securely fastened, even after repeated exposure to ocean mist.