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Technical Standards & Grades

Certified metal specifications for Boston contractors

Sydney Sheetmetal adheres to strict ASTM material standards and SMACNA fabrication tolerances on every sheared plate, formed channel, and welded architectural assembly leaving our Dorchester floor.

+/- 0.015"

CNC brake tolerance

ASTM

certified mill reports

24/7

quote turnaround

Inventory Stock Data

Primary alloy grades ready for immediate shear & brake operations

Full mill test reports available for all commercial and municipal builds across Greater Boston.

Grade G90
Type 304 / 316
Alloy 5052-H32

Galvanized Steel

Stainless Steel

Marine Aluminum

Hot-dip galvanized sheet stocked from 26 gauge up to 7 gauge. High corrosion resistance for structural cladding and heavy-duty HVAC ducting.

Precision finished stainless sheet plates with mill or brushed finish. Engineered for architectural flashing, cleanroom panels, and food service assemblies.

High strength-to-weight marine grade aluminum stock. Excellent formability and salt-water corrosion resistance for exterior architectural metalwork.

Dimensional Compliance

Numerical tolerance bounds for engineering review

+/- 0.5 deg

press brake angularity

0.010"

shear kerf precision

1/16"

diagonal squareness limit

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Have non-standard gauge or specialty alloy requirements?

Send us your CAD files or hand-drawn field dimensions. Our Dorchester estimating team prices exact prints the same afternoon.