Type C Foundation Bolt – Product Introduction

The Type C Foundation Bolt is a ring-type embedded anchoring fastener defined under the GB/T 799 standard. The closed-loop ring at the shank end can be threaded with transverse rebar to form a dual pull-out anchoring system. Manufactured from carbon steel, alloy steel, or stainless steel, the ring butt weld undergoes non-destructive flaw detection to ensure zero defects. Suitable for heavy-duty engineering projects with extremely high anchoring reliability requirements, such as large equipment foundations, bridge bearings, and structural steel column bases.

I. Product Features

Closed-loop ring structure: The end is bent into a closed ring that can accommodate transverse rebar threading, offering over 30% greater pull-out capacity compared to hook-type designs.

100% weld flaw detection: The ring butt weld undergoes magnetic particle or liquid penetrant inspection, free from incomplete fusion and cracks, with strength no less than 90% of the base material.

Uniform stress distribution with no stress concentration: The ring structure transfers loads uniformly to the surrounding concrete, delivering excellent resistance to eccentric loading and fatigue.

High thread precision: Rolled threads with 6g precision, smooth nut engagement, and reliable locking.

Wide specification coverage: Diameters from M8 to M72, lengths customized as needed, ring inner diameter matched to standard specifications.

Multiple material options: Full range including carbon steel (Q235B / No. 45 steel), alloy steel (40Cr / 42CrMo), and stainless steel (304 / 316L).

II. Product Advantages

Maximum anchoring force with high safety margin: The ring-and-rebar structure provides dual protection — even if concrete cracks, sufficient anchoring margin remains.

Traceable quality assurance: Each batch comes with material certificates, flaw detection reports, and dimensional inspection records, meeting inspection and traceability requirements for high-end projects such as nuclear power and bridges.

Long anti-corrosion service life: Hot-dip galvanized carbon steel with zinc coating ≥ 85 μm offers a service life exceeding 20 years; stainless steel provides lifetime maintenance-free performance.

Precise construction positioning: The ring’s rebar-threading capability ensures accurate embedment positioning, substantially reducing on-site adjustment work.

Non-standard customization supported: Custom ring diameter, length, material, and special requirements available per customer drawings, with flexible delivery schedules.

III. Application Scope

Heavy-duty equipment foundations: Anchoring of large compressors, steam turbines, generators, rolling mills, crushers, and other vibrating equipment.

Structural steel column bases: Steel column fixation for super high-rise buildings, large-span grid structures, stadiums, and convention centers.

Bridge engineering: Embedded bearing pre-installation for highway and railway bridges, bridge pier collision protection facilities, and cross-sea bridge tower foundations.

Power and energy: Nuclear power plant equipment, main power plant buildings, wind turbine towers, and UHV transmission tower foundations.

Municipal facilities: Large water treatment tanks, elevated bridge piers, tall billboard and signage structure foundations.

Ports and marine engineering: Dock bollards, breakwater embedded components, and offshore platform equipment fixation.