J Type Anchor Bolts 8.8 Grade Carbon Steel Zinc Plated DIN 529 Foundation Anchor Custom Available

J Type anchor bolts are heavy-duty fasteners with a curved J-shaped hook at one end, designed for embedment in concrete. The hook provides mechanical interlock, resisting pullout forces by bearing directly against the surrounding concrete. Common reference standards include ASTM F1554 and DIN 529.

Materials

• Carbon Steel Grade 2: 60,000 psi minimum tensile strength; economical for light-duty indoor applications with protective coating.

• Carbon Steel Grade 5: 105,000 psi minimum tensile strength; heat-treated for medium-duty equipment mounting.

• Carbon Steel Grade 8: 150,000 psi minimum tensile strength; heat-treated for extreme loads and vibration resistance.

• Stainless Steel 304 (A2-70): 70,000 psi tensile strength; general corrosion resistance for food processing and cleanrooms.

• Stainless Steel 316 (A4-80): 80,000 psi tensile strength; enhanced chloride resistance for marine and chemical environments.

Surface Finishes

• Zinc Plated: 48+ hours salt spray protection; standard for indoor general industrial use.

• Hot-Dip Galvanized: Thick zinc coating for outdoor foundations exposed to weather.

• Mechanical Galvanizing: Hydrogen embrittlement-safe coating for high-strength steel.

• Plain (Oiled): As-manufactured with rust preventive oil; suitable for grout encapsulation.

• Passivated: Removes surface contaminants from stainless steel; maximizes corrosion resistance.

Specifications

• Diameter: M6 to M48 metric; 1/4-inch to 2-inch imperial.

• Length: 100mm to 1200mm metric; 4-inch to 48-inch imperial.

• Hook Length: Typically 3x to 4x bolt diameter for optimal pullout resistance.

• Thread Length: Full or partial thread options per customer requirements.

• Thread Type: Coarse thread (UNC/ISO) standard; fine thread available for vibration-sensitive applications.

Key Application Areas

• Column Base Plates: Anchoring structural steel columns to concrete foundations, resisting uplift from wind or seismic events.

• Equipment Foundations: Securing compressors, pumps, and heavy machinery against dynamic loads and continuous vibration.

• Highway Sign Structures: Embedding in drilled shafts to anchor overhead sign supports against wind loads.

• Transmission Towers: Guy wire attachments for utility poles and communication towers, preventing displacement during high winds.

Customer Case

Situation: A petrochemical facility installed new vertical vessels requiring anchorage against wind and seismic loads. Initial straight bolt specifications risked pullout failure under design conditions.

Task: Engineering required anchor bolts with verified pullout resistance and corrosion protection for the industrial chemical environment.

Action: Supplied 1-1/4-inch diameter x 30-inch J Type anchor bolts, Grade 55 carbon steel, hot-dip galvanized. The J-hook configuration provided 3.5x diameter embedment depth. Grade 55 delivered 55,000 psi minimum yield. Hot-dip galvanizing protected against chemical exposure.

Result: Independent pullout tests confirmed J Type anchor bolts exceeded design requirements by 25%. The facility reported zero foundation issues through five years of operation. Engineering now specifies J Type anchor bolts for all critical vessel foundations.