SDA Anchor Plate (Domed Bearing Plate) Self Drilling Anchor (SDA)
STRUCTURAL DOMED BEARING PLATES

SDA Anchor Plate (Domed Bearing Plate)

Heavy-duty structural steel domed bearing plates engineered to distribute rock anchor pre-stressing and working loads uniformly into rock surfaces, shotcrete facings, or wire mesh. The central dome allows angular misalignment up to 5–7 degrees when paired with spherical hexagonal anchor nuts, eliminating eccentric bending moments.

Angular Compensation
5° to 7° spherical seat absorbs irregular rock faces
Uniform Load Dispersion
Prevents punching failure through shotcrete or soil face
High Bearing Capacity
Tested to exceed bar yield load in direct compression
Weathering Durability
Heavy galvanized finish protects against tunnel moisture
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

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

SDA Anchor Plate (Domed Bearing Plate) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
Plate Type
Domed Bearing Plate (Square Structural Steel)
02
Compatible Bar Sizes
R25, R32L/N/S, R38N, R51L/N, T76N/S
03
Dimensions
150×150 mm (R25), 200×200 mm (R32 & R38), 250×250 mm (R51 & T76)
04
Thickness
8 mm (R25), 10 mm (R32L/N), 12 mm (R32S/R38N), 30–40 mm (R51/T76)
05
Center Hole Diameter
30 mm (R25), 35 mm (R32), 41 mm (R38), 60 mm (R51), 80 mm (T76)
06
Weight
1.40 kg to 18.0 kg per plate
07
Steel Grade
Structural Carbon Steel S235 / S355
08
Surface Coating
Hot-Dipped Galvanization (ISO 1461) / Black Bare
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
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Engineered to deliver uniform bearing stress against structural mesh or shotcrete linings. Full dimensions and thicknesses across R25 to T76 series are listed below from our official technical specifications:

Domed Anchor Bearing Plates Dimensions & Thickness

Specification Unit R 25N R 32L R 32N R 32S R 38N R 51L R 51N T 76N T 76S
Plate Size mm 150×150 200×200 200×200 200×200 200×200 200×200 250×250 250×250 250×250
Thickness mm 8 10 10 12 12 30 40 40 40
Hole Diameter mm 30 35 35 35 41 60 60 80 80
Unit Weight kg 1.40 1.40 1.40 3.40 3.40 14.0 18.0 18.0 18.0
Anti-Corrosion - ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG ISO 1461 HDG
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