Roy Manufacturing LLC | Portland, OR

Technical Information

Roy Manufacturing is committed to providing a quality product with quick deliveries. In business since 1958, Roy has grown and developed into one of the northwest’s largest supplier of perforated metals. Roy Manufacturing production capabilities include everything from small precision perforated pieces to heavy screen plates. Materials include mild steel, aluminum, brass, copper, stainless steel, titanium, zirconium and plastics. We have one of the largest variety of stock perforated sheets in the northwest available for immediate shipping from our Portland warehouse.

Guide to Ordering Custom Parts

Please click here to download a PDF form.

Open Area Calculators

Calculate open area, given hole diameter and spacing — or calculate spacing, given hole diameter and open area.

Round - 60° Staggered Center - Hole Diameter (D) - Spacing (S) - Open Area (OA) - Holes per Square Inch (HPSI)	Round - Straight Center - Hole Diameter (D) - Spacing (S)) - Open Area (OA) - Holes per Square Inch (HPSI)
Square - Straight or 45° Staggered Center - Hole Diameter (D) - Spacing (S) - Open Area (OA) - Holes per Square Inch (HPSI)	Round End Slot - Staggered Center - Width of Slot (W) - Length of Slot (L) - Side Center (B) - End Center (A) - Open Area (OA) - Holes per Square Inch (HPSI)
Round End Slot - Straight Center - Width of Slot (W) - Length of Slot (L) - Side Center (B) - End Center (A) - Open Area (OA) - Holes per Square Inch (HPSI)	Square End Slot - Staggered or Straight Centers - Width of Slot (W) - Length of Slot (L) - Side Center (B) - End Center (A) - Open Area (OA) - Holes per Square Inch (HPSI)
Hexagon - Hole Diameter (D) - Spacing (S) - Open Area (OA) - Holes per Square Inch (HPSI)	Round 45° Staggered Center - Hole Diameter (D) - Spacing (S) - Open Area (OA) - Holes per Square Inch (HPSI)