Strut Services Group, Inc.

Unistrut Alabama



P4003 – 1-5/8″ x 2 7/16″, 16 Gage, Triple Combination

Unistrut’s P4003 (triple combination) is welded with three channel for additional strength. This channel is ideal for supporting large loads across long spans, offers versatility with connection points at both ends, and avoids welding on the jobsite.

This channel is commonly used for applications with heavy load requirements such as healthcare supports, lab supports with specialized HVAC systems, and general commercial structures where P4001 material has insufficient load capacities.

Product dimensions are 1 5/8″ wide x 2 7/16″ tall x 16 ga. thick; triple combination of our P4000 channel.

Our P4003 is available in the following finishes: Pre-Galvanized (PG), Plain (PL), and Hot-Dip Galvanized (HG), Green (GR), and Stainless Steel (SS).


Part No. Length (ft) Finish Product Weight / Ft (lbs/ft)
P4003 20 PG 2.48
P4003 10 PG 2.48
P4003 20 HG 2.61
P4003 10 GR 2.48
P4003 20 GR 2.48
P4003 20 PL 2.48
P4003 10 PL 2.48
Elements of Section – P4003
Area of Section 0.731 in2 (4.7 cm2)
Axis 1-1 Axix 2-2
Moment of Inertia (I) 0.424 in4 (17.6 cm4) 0.195 in4 (8.1 cm4)
Section Modulus (S) 0.342 in3 (5.6 cm3) 0.240 in3 (3.9 cm3)
Radius of Gyration (r) 0.761 in (1.9 cm) 0.517 in (1.3 cm)
Standard Lengths:
  • 10 feet: 10′ or 10’ 1/8” (3.05m) ± 1/8″ (3 mm)
  • 20 feet: 20′ or 20’ 3/8” (6.11m) ± 1/8″ (3 mm)
Special Lengths:
  • Available with a tolerance of ±1/8″ (3 mm). Request quote.
Curved Channel:
  • Many Unistrut channel sections can be supplied with a curve. Contact us for our ordering form, specifications, and instructions.
Load Data:
  • All beam and column load data pertains to carbon steel and stainless steel channels.
  • Load tables apply only to UNISTRUT brand channel. Look for “UNISTRUT” on the product.
  • Load tables and charts are constructed to be in accordance with the SPECIFICATION FOR THE DESIGN OF COLD-FORMED STEEL STRUCTURAL MEMBERS 2007 EDITION published by the AMERICAN IRON AND STEEL INSTITUTE USING ASD METHOD.
  • Loads are based on 33 ksi steel cold formed to 42 ksi.
  • Safety Factor to Yield Strength is 1.67 for Beam Loads and 1.80 for Column Loads.
  • Beam loads are based on a simple beam and are given as a total uniform load (W) in pounds. For proper calculation procedures, refer to our Beam Load Calculation Guide.
  • For bearing loads, reference our bearing loads page.
  • Welded channels are spot welded 2″ (51 mm) or 3″ (76 mm) on-center.

Materials & Finishes – Standard:

  • Pregalvanized (PG):  Conforms to ASTM A653 SS GR 33, G90.
  • Unistrut Defender (DF):  Conforms to ASTM A1046 SS GR 33
  • Hot Dip Galvanized (HG):  Steel conforms to ASTM A1011 SS GR 33, Finish conforms to ASTM A123
  • Perma-Green (GR):  Steel conforms to ASTM A1011 SS GR 33, E-Coat finish
  • Perma-Gold (ZD):  Steel conforms to ASTM A1011 SS GR 33, Finish conforms to ASTM B633, Type II SC3
  • Plain (PL):  Conforms to ASTM A1011 SS GR 33

Materials & Finishes – Special Metals:

  • Stainless Steel, Type 304 (SS):  ASTM A240, Type 304 *
  • Stainless Steel, Type 316 (ST):  ASTM A240, Type 316 *
  • Aluminum (EA):  ASTM B221, Type 6063-T6 (Extruded) *

* These materials have different physical properties and performance characteristics. Please contact us for design support.

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