SDA HOLLOW ANCHOR BARS – R25, R32 & R38

Product Overview

Engineered for demanding geotechnical and underground construction applications, Self-Drilling Anchor (SDA) Bars manufactured by SSK ENGINEERING feature a heavy-duty, continuously threaded hollow steel profile designed for ground reinforcement and anchoring applications.

Unlike conventional solid anchor bars that generally require a separate drilling arrangement, an SDA system uses a hollow threaded bar that can function as both the drilling element and the permanent reinforcement component. When equipped with a compatible sacrificial drill bit and connected to the appropriate drilling and grouting equipment, the system enables drilling and grout injection in a single operation.

The hollow core facilitates the passage of drilling fluid or grout, depending on the installation method, helping improve grout distribution and ground consolidation. Once installed and grouted as specified, the anchor system helps transfer loads between the supported structure and the surrounding ground.

SSK ENGINEERING offers SDA Hollow Anchor Bars in R25, R32 and R38 configurations, with customised lengths and technical specifications available subject to manufacturing feasibility and customer requirements.

Available Product Range

1. R25 SDA Hollow Anchor Bar

• Designed for compatible R25 self-drilling anchor systems.

• Suitable for specified ground-reinforcement and anchoring applications.

• Compatible with matching R25 coupler sleeves, drill bits, nuts and plates.

• Suitable for projects requiring a compact anchor-system configuration, subject to engineering design.

2. R32 SDA Hollow Anchor Bar

• Designed for compatible R32 self-drilling anchor systems.

• Used in ground stabilisation, excavation support and geotechnical anchoring applications where specified.

• Compatible with matching R32 coupler sleeves, anchor nuts, dome nuts, plates and drill bits.

• Suitable for project-specific anchoring systems with appropriate design and verification.

3. R38 SDA Hollow Anchor Bar

• Designed for compatible R38 self-drilling anchor systems.

• Suitable for specified tunnelling, mining, slope-stabilisation and ground-reinforcement applications.

• Compatible with matching R38 coupler sleeves, nuts, plates and drill bits.

• Available for project-specific requirements, subject to the approved technical specification.

Important: R25, R32 and R38 identify anchor-system sizes. Exact outside dimensions, internal diameter, thread profile, pitch, tensile capacity and other mechanical properties must be confirmed against the relevant manufacturer's specification or approved drawing.

Key Features and Functional Benefits

• Continuously threaded profile: Supports connection and adjustment using compatible threaded system components.

• Hollow-core construction: Allows drilling fluid or grout to pass through the bar as required by the installation system.

• Combined drilling and anchoring system: The bar can serve as both the drilling element and permanent reinforcement when used with compatible equipment and accessories.

• Modular connection: Compatible coupler sleeves allow bar sections to be joined to achieve the required anchor length.

• Grouting capability: Supports grout injection through the hollow core to help bond the anchor to the surrounding ground.

• Adaptability: Can be specified for different ground conditions, anchor lengths and project requirements through appropriate engineering design.

• Accessory compatibility: Can be supplied as part of a complete SDA system with matching couplers, drill bits, anchor nuts and plates.

Applications and Industries

Tunnelling and Underground Infrastructure
Used in specified ground-support systems for tunnel excavation, underground access works, caverns and other underground construction applications.

Mining and Rock Reinforcement
Applied in compatible rock-bolting and ground-support systems to reinforce rock masses and help stabilise underground excavations.

Slope Stabilisation and Rockfall Protection
Used in engineered anchoring arrangements for stabilising rock slopes, cuttings and potentially unstable ground.

Hydropower and Dam Projects
Suitable for specified anchoring and ground-reinforcement applications associated with underground powerhouses, access tunnels, caverns and dam infrastructure.

Soil Nailing and Excavation Support
Can be incorporated into compatible ground-reinforcement systems for retaining structures, excavations and soil-stabilisation projects.

Foundation Micropiling and Ground Improvement
May be used in engineered micropile or foundation systems where the selected hollow bar, grout, connection and installation method meet the project's design requirements.

Material and Customisation Options

Material grade and mechanical properties should be selected according to the project's design requirements and applicable specifications. Steel grade, strength class and heat-treatment condition should be confirmed before ordering.

SSK ENGINEERING can review requirements for:

• R25, R32 and R38 anchor-system configurations.

• Custom bar lengths and cut-to-length requirements.

• Compatible thread profiles and accessories.

• Project-specific material and mechanical-property requirements.

• Matching coupler sleeves, sacrificial drill bits, anchor nuts and plates.

• Bulk orders and customised manufacturing against approved drawings.

Why Choose SSK ENGINEERING?

• Precision-focused manufacturing.

• Competitive, value-driven commercial proposals.

• Product configurations tailored to approved customer specifications.

• Coordinated supply of compatible SDA system components.

• Support for bulk requirements and project-based orders.

• A long-term partnership approach focused on consistent quality and dependable supply.

Technical Information Required for Quotation

To evaluate your requirement accurately, please share:

1. Required anchor size: R25, R32 or R38.

2. Bar length and required quantity.

3. Thread profile and dimensional specification.

4. Required steel grade and mechanical properties.

5. Drill-bit type and ground conditions, where known.

6. Grouting and installation requirements.

7. Required couplers, nuts, plates and other accessories.

8. Inspection, testing and documentation requirements.

SSK ENGINEERING
Ludhiana, Punjab, India

Precision manufacturing for tunnelling, mining, geotechnical engineering and ground-support applications.