Strut Services Group, Inc.

Unistrut Alabama



P1180W / P1280W / P2280W / P3280W / P4280W / P5280W / P5580W 
End Cap (1-5/8″ Series)

Part No. Finish Product Weight / Piece (lbs)
P1180W EG 0.12
P1280W EG 0.11
P1280W ZD 0.11
P2280W EG 0.11
P3280W EG 0.15
P4280W EG 0.05
P5280W EG 0.3
P5580W EG 0.18

Standard Dimensions (Unless Shown Otherwise on Drawing):

  • Hole Diameter:  9/16”  (14mm)
  • Hole Spacing (From End):  13/16”  (21mm)
  • Hole Spacing (On-Center):  1 7/8”  (48mm)
  • Width:  1 5/8”  (41mm)
  • Thickness:
    • 1/4”  (6.4mm) with steel meeting or exceeding ASTM A1011 SS GR 33, or
    • 0.220″ (5.6mm) with steel meeting or exceeding ASTM A1011 HSLAS GR 45


  • When used for mechanical supports, load capacities of brackets and fittings should be in compliance with the American Standard Code for Pressure Piping.

Electrical Fittings:


  • Unistrut fittings, unless noted, are made from hot-rolled, pickled and oiled steel plates, strip, bar or coil, and conform to one or more of the following specifications: ASTM A575, A576, A635, A1011 SS GR 33, A1011 HSLAS GR 45 or A36. The fitting steel also meets or exceeds the physical requirements of ASTM A1011 SS GR 33.
  • Cable saddles are fiberglass-reinforced polyester.

Channel Raceways:

  • The Unistrut Metal Framing System includes an exclusive combination of channel, fittings and hardware listed under new UL classification 5B. This classification covers strut-type channel raceways and fittings for use in accordance with Article 384 of the National Electrical Code, NFPA 70. Included are metal strut-type channel raceways at least .071 inch (1.81mm) thick and metal or non-metal closure strips at least .040 inch (1.02mm) thick.
  • The Unistrut system requires no welding, drilling or other complex fabrication techniques. This means faster, easier solutions for virtually any electrical support problem.
  • Unistrut channel offers structural and spanning capabilities not available with conventional surface raceway products and is available in continuous lengths of up to 20 feet. Just as important, it is part of an integrated system that can be used for raceways, trapeze hangers, cable-tray supports, lighting grids, fluorescent-fixture supports and countless other electrical applications.

Channel Compatibility:

  • All of the electrical components in this section are intended for use with any of the 1-5/8″ wide channel.
  • They are not intended for use with 1-1/4″ or 13/16″ framing systems.

Design Load:

  • Design load data, where shown, is based on the ultimate strength of the connection with a safety factor of 2.5, unless otherwise noted.


Note: Many Unistrut Metal Framing components, when used with appropriate closures, are UL® listed, and CSA approved.

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.

Electrical Technical Data


  • Cold-formed inserts are manufactured from standard 12 gauge (2.7 mm) Unistrut channel sections conforming to ASTM A1011 SS GR 33 or ASTM A653 GR 33, unless otherwise noted.
  • To inhibit concrete, all inserts (except spot inserts) are provided with closure strips and end caps or foam filler, unless otherwise requested.
  • Most concrete inserts are available in stainless steel on special order. Consult factory for ordering information.


  • A wide range of heavy-duty to light-duty “continuous” and “spot” concrete inserts are available for use in pre-cast, pre-stressed or poured-in-place concrete floors, walls or ceilings.


  • Imperial dimensions are illustrated in inches. Metric dimensions are shown in parenthesis or as noted. Unless noted, all metric dimensions are in millimeters.
    Custom-designed inserts are available on special order. Consult factory for ordering information.

Design Load:

  • Design loads, where shown, are based on 3,000 PSI concrete, unless noted.

Standard Lengths:

  • Insert lengths range from 3 inches (76 mm) to 20 feet (6.10m) with a tolerance of ±1/4-inch (6.4mm).
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