P3820 - 45° Seismic Retrofit Brace Fitting (for Strut)

The P3820 is a 45° fixed angle retrofit fitting for use primarily with seismic braces. This fitting can be used to attach a strut brace to a trapeze or other strut connection.

As a retrofit fitting, this product can be used to attach a seismic brace to an existing support without the need to disassemble that support.

The P3860 platform is not included in this assembly and is sold separately.

This fitting is pre-approved for the below seismic loads on page 5c.2 of Unistrut's OPM-0295-13.
Part No. Finish Product Weight / Piece (lbs)
P3820 EG 1.1

    Seismic Design Loads

    P3820 - Image 03
    1. Seismic Design Loads only apply to UNISTRUT brand products. Look for "UNISTRUT" on the part.
    2. Seismic Design Loads are based on FM1950-10 dynamic testing with 12 ga. channel and a safety factor of 1.5.
    3. 1/2" Unistrut Channel Nut and Cap Screw torqued to 50 ft-lbs required for installation.
    4.  Reference page 5c.1 of Unistrut OPM-0295-13.

    General Specifications

    Standard Dimensions:

    • 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

    Materials & Finishes

    Materials & Finishes:

    • Electrogalvanized (EG):  Conforms to ASTM B633, Type III SC1 or SC3

    Related Resources


    Technical Documents