Product Summary

Longze Heavy-Duty L-Shaped Anchor Bolts are essential fasteners for securing structural steel columns, light poles, and heavy industrial machinery to concrete foundations. Manufactured in

Yongnian, China, our foundation bolts feature a precision-bent 90-degree leg that provides superior pull-out resistance by mechanical anchorage within the cured concrete.

• ✔ Engineering Standards: Fully compliant with ASTM F1554 (Grades 36, 55, 105) and DIN 529 (Type AL).

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• ✔ High-Tension Performance: Designed to transfer structural loads safely from the column base to the footing.

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• ✔ Precision Threading: Extended thread lengths available to accommodate various base plate thicknesses and leveling nuts.

• Standards: ASTM F1554, DIN 529, ISO 898-1.

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• Diameter Range: M10 to M64 | 3/8" to 2-1/2".

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• Length Range: 150mm to 1500mm (6" to 60").

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• Material Grade: Low Carbon Steel (Grade 36), High Strength (Grade 55/105), Class 4.6 to 8.8.

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• Surface Finish: Plain Steel, Zinc Plated, Hot Dip Galvanized (HDG).

Mechanical Properties & Grade Comparison

• Selecting the correct steel grade for light-duty to heavy-duty structural anchoring.

• Grade / Property Class	Tensile Strength	Yield Strength	Hardness Range	Best Applications
  ASTM F1554 Gr. 36	58 to 80 ksi	36 ksi	70 to 95 HRB	Standard Steel Columns
  ASTM F1554 Gr. 55	75 to 95 ksi	55 ksi	80 to 100 HRB	High-Wind Light Poles
  ASTM F1554 Gr. 105	125 to 150 ksi	105 ksi	26 to 35 HRC	Heavy Machinery / Cranes
  Class 4.6 (DIN 529)	400 MPa	240 MPa	67 to 95 HRB	Residential Construction

L-Bolt Dimensions & Embedment Reference

• Precise sizing of the 90-degree hook (L) and thread length (T) for secure foundation anchoring.

• Thread Size (D)	Hook Length (L)	Thread Length (T)	Min. Embedment	Match Nut Grade
  M16 (5/8")	50mm to 75mm	75mm to 100mm	250 to 300 mm	ASTM A563 Grade A
  M20 (3/4")	75mm to 100mm	100mm to 125mm	350 to 400 mm	ASTM A563 Grade A
  M24 (1")	100mm to 125mm	125mm to 150mm	450 to 500 mm	ASTM A194 2H
  M30 (1-1/8")	125mm to 150mm	150mm to 200mm	550 to 650 mm	ASTM A194 2H

Coating Selection & Thread Protection

• Ensuring the exposed thread remains corrosion-free before and after the concrete pour.

• Surface Treatment	Coating Thickness	Protection Level	Best Environment
  Plain Steel (Oiled)	N/A	Basic	Indoor / Immediate Pour
  Zinc Plated	5 to 12 μm	Moderate	Temporary Exposure
  Hot Dip Galvanized	≥ 55 μm	Excellent	Outdoor / Coastal / Wet
  Thread Waxed / Taped	N/A	High	Protection during Pouring

 

Avoid Pitfalls:

• Bending Radius Integrity: We prevent "stress risers" at the 90-degree bend by using controlled-radius bending tools. This ensures the L-hook doesn't become a weak point during seismic or high-load events.

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• Nut Seizing Prevention: For HDG (Hot Dip Galvanized) anchor bolts, we perform precision over-tapping on the nuts to ensure they spin freely even with a thick 55μm+ zinc layer.

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• Thread Damage Protection: We understand that foundation bolts take a beating on-site. Every Longze anchor bolt shipment includes options for plastic thread protectors to ensure the threads stay clean and sharp during the concrete pour.

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Perfect Fit Assembly:

• Complete Hardware Kits: Every L-bolt can be supplied as a "Fastener Kit," including Heavy Hex Nuts, Oversized Plate Washers, и Leveling Nuts for precise column alignment.

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• Custom Hook Geometries: Whether you need a standard 90-degree L-bolt or a specific J-bolt configuration, our Yongnian factory can customize the hook length to meet your blueprint specs.

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Quality Control & Logistics:

• ISO 9001 Certified: 5-step QC including chemical analysis of the steel rod, tensile testing, and 100% thread gauge verification.

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• Sea-Worthy Packaging: Threaded sections are protected with industrial-grade wrap; bolts are bundled and shipped in reinforced wooden crates or heavy-duty steel-strapped pallets for safe transit.

• Q: Do you offer ASTM F1554 Grade 55 with S1 supplementary requirements? A: Yes, we can provide Grade 55 with S1 weldability requirements for applications where the bolt must be welded to a rebar cage.

• Q: What is the lead time for large diameter foundation bolts (M36 to M64)? A: For heavy diameters, our production cycle is typically 12 to 18 days, including heat treatment and galvanizing.

• Email:eric@lzfastener.com  What'sApp:+86 15350500528 WeChat:+86 18830006928 or 15350500528