Southwark Metal ST90528 Straight Elbow Adjustable 0 to 90 Degree 5 Inches 28 Gauge Galvanized Steel Round Duct Fitting

Product Description

The Southwark Metal ST90528 is a round galvanized steel straight elbow designed for use in residential and commercial HVAC ductwork systems. This fitting starts as a straight connector and adjusts to form a full 90 degree elbow, giving installers the flexibility to route duct runs without needing multiple fixed-angle fittings on the job. The ST90528 is sized at 5 inches in diameter and fabricated from 28 gauge hot dipped galvanized steel that meets ASTM A653 CS Type B standards. That coating provides reliable corrosion resistance, making this fitting well suited for both supply and return air applications in forced air systems. HVAC technicians and sheet metal contractors rely on fittings like this to make clean, airtight connections in tight spaces where fixed elbows are impractical. The male end features a crimp and bead connection with a 1 inch crimp length for a secure friction fit into standard round duct. The straight female end accepts the next duct section and includes a 1/2 inch overlap designed for riveting using 1/8 inch rivets. The RL-2 rivet seam construction supports pressure ratings of plus or minus 4 inches water gauge at the seam and plus or minus 2 inches water gauge overall, meeting standard low pressure duct system requirements. The 4 piece assembly format is used for 3 inch through 20 inch diameter sizes, making the ST90528 part of a consistent product family for round duct installations. Sold as a single unit, this fitting is a reliable choice for trunk line changes, branch duct routing, and equipment connections across a wide range of residential and light commercial HVAC jobs. Made in the USA.

• Adjustable from straight to 90 degrees for flexible duct routing on the job
• Crimp and bead male end with 1 inch crimp length and straight female end with 1/2 inch rivet overlap
• Hot dipped galvanized steel per ASTM A653 CS Type B rated for plus or minus 2 inches water gauge overall pressure

Product Highlights

The Southwark Metal ST90528 delivers field-adjustable 0 to 90 degree duct routing in a durable 28 gauge galvanized steel construction, built to standard low pressure duct system specifications for reliable HVAC installations.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ST90528

Technical Specifications

• Diameter: 5 inches
• Gauge: 28 GA
• Shape: Round
• Material: Galvanized Steel
• Coating: Hot Dipped Galvanized per ASTM A653 CS Type B
• Bend Angle Range: 0 to 90 Degrees
• Crimp Length: 1 inch
• Rivet Overlap: 1/2 inch
• Rivet Size: 1/8 inch
• Seam Type: RL-2 Rivet Seam
• Pressure Rating (Seam): Plus or Minus 4 inches Water Gauge
• Pressure Rating (Overall): Plus or Minus 2 inches Water Gauge
• Assembly: 4 Piece (3 inches through 20 inches diameter)
• Adjustable: Yes
• Weight: 0.76 pounds
• Country of Origin: USA
• Unit of Measure: Each
• Prop 65: Yes