R38 SDA (Self Drilling Anchor Bolt) Self Drilling Anchor (SDA)
HEAVY-DUTY R38 HOLLOW ANCHOR BOLT

R38 SDA (Self Drilling Anchor Bolt)

The R38 SDA (Self Drilling Anchor Bolt) is a high-capacity continuous-thread hollow steel rock anchor engineered for demanding tunneling portals, heavy slope stabilization, railway cuts, and deep foundation tiebacks. The R38 bar delivers an ultimate tensile load of 500 kN and a yield load of 400 kN, offering 40% higher tensile strength than standard R32 anchors.

500 kN Ultimate Load
Provides 40% higher load capacity than standard R32 anchors
22mm Flush Core
Large internal bore ensures unobstructed high-pressure cement grouting
Single-Pass Installation
Eliminates casing requirements in collapsing sands, gravels, and fractured rock
Full-Length Rope Thread
Allows cutting, coupling, or trimming at any position on site
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

Certified engineering tolerances, metallurgical grades, and load metrics for heavy geotechnical installations.

R38 SDA (Self Drilling Anchor Bolt) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
Thread Profile
ISO 10208 Continuous Rope Thread (R38)
02
Outside Diameter (OD)
38.0 mm
03
Internal Diameter (ID)
22.0 mm
04
Cross-Sectional Area
597 mm²
05
Ultimate Tensile Load (Ft)
500 kN
06
Yield Load (Fy)
400 kN
07
Unit Weight
4.50 kg/m
08
Material Grade
EN 10083-1 High Tensile Micro-Alloy Steel
09
Thread Direction
Left-hand (standard) or Right-hand
10
Standard Lengths
1m, 2m, 3m, 4m, 6m (Custom up to 10m)
11
Surface Treatment
Hot-Dipped Galvanization (ISO 1461), Bare Steel, Epoxy Coated
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
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Verified Technical Reference

R38 SDA System Engineering Overview

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The R38 SDA system is the optimal engineering choice when ground reinforcement requires higher tensile resistance without significantly increasing drill rig torque requirements. Manufactured from micro-alloy structural steel with ISO 10208 continuous rope threading.
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