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Recommended Strut for Suspension

Review our recommended strut span guidelines for secure seismic-rated suspension installations, featuring detailed load capacities for Sasco and Unistrut models.
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Recommended Strut for Suspension

EDITION 2: APRIL 10th 2025
CONCENTRATED/POINT LOADS (TYPICALLY EQUIPMENT SUSPENSION)

Notes:

  1. Model numbers and loads are based on Sasco and Unistrut – 1-5/8” wide. If an alternative strut is used a full review may be required. Details to be provided to Capital Seismic & Engineering Ltd before installation.
  2. All strut to be 12 gauge as per models below.
  3. The tables below assumes slotted. A small increase in loading is permissible with solid strut. Contact Capital Seismic & Engineering Ltd for further information/review.
  4. Loads listed at the maximum per strut.
  5. Connections to the structure must be confirmed to be capable of the required loads.
  6. These values are a guide only and an engineering review is always recommended to prevent potential harm to occupants/equipment.

Allowable Loads per Strut (Imperial – lbs)

SASCO Unistrut Depth (“) 2ft 3ft 4ft 5ft 6ft 7ft 8ft 9ft 10ft 12ft
S9BB P5001 6-1/2 2250 2150 2150 2150 2150 1900 1700 1500 1300 1100
S1BB P5501 4-14/16 1650 1650 1650 1650 1650 1350 1150 1000 900 800
S2BB P100A 3-1/4 1100 1100 1000 800 700 550 500 400 350 300
S1 P5500 2-7/16 1400 900 700 550 450 350 300 300 250 200
S2 P1000 1-5/8 700 450 350 250 200 200 150 150 100 100
S8 P3000 1-3/8 550 350 250 200 150 150 100 100 100 50
S5 P4400 1 300 200 150 100 100 50 50 50 50 0

Allowable Loads per Strut (Metric – kg)

SASCO Unistrut Depth (mm) 0.6 0.9 1.2 1.5 1.825 2.125 2.425 2.725 3.025 3.65
S9BB P5001 165 1000 975 975 975 975 875 750 675 600 500
S1BB P5501 124 750 750 750 725 600 525 450 400 350 300
S2BB P100A 83 500 500 450 350 325 250 225 200 175 125
S1 P5500 62 625 425 300 250 200 175 150 125 100 100
S2 P1000 42 325 200 150 125 100 75 75 50 50 50
S8 P3000 35 250 150 125 75 75 50 50 50 25 25
S5 P4400 25 125 75 50 50 25 25 25 25 25 0

Contact Capital Seismic & Engineering Ltd if the application does not fit within the above parameters and we can provide a more detailed review.

Recommended Strut for Suspension

EDITION 2: APRIL 10th 2025
DISTRIBUTED LOADS (TYPICALLY PIPING/CONDUIT SUSPENSION)

Notes:

  1. Model numbers and loads are based on Sasco and Unistrut – 1-5/8” wide. If an alternative strut is used a full review may be required. Details to be provided to Capital Seismic & Engineering Ltd before installation.
  2. All strut to be 12 gauge as per models below.
  3. The tables below assumes slotted. A small increase in loading is permissible with solid strut. Contact Capital Seismic & Engineering Ltd for further information/review.
  4. Loads listed at the maximum per strut.
  5. Connections to the structure must be confirmed to be capable of the required loads.
  6. These values are a guide only and an engineering review is always recommended to prevent potential harm to occupants/equipment.

Allowable Loads per Strut (Imperial – lbs)

SASCO Unistrut Depth (“) 2ft 3ft 4ft 5ft 6ft 7ft 8ft 9ft 10ft 12ft
S9BB P5001 6-1/2 2250 2150 2150 2150 2150 1900 1700 1500 1300 1100
S1BB P5501 4-14/16 1650 1650 1650 1650 1650 1350 1150 1000 900 800
S2BB P100A 3-1/4 1100 1100 1000 800 700 550 500 400 350 300
S1 P5500 2-7/16 1400 900 700 550 450 350 300 300 250 200
S2 P1000 1-5/8 700 450 350 250 200 200 150 150 100 100
S8 P3000 1-3/8 550 350 250 200 150 150 100 100 100 50
S5 P4400 1 300 200 150 100 100 50 50 50 50 0

Allowable Loads per Strut (Metric – kg)

SASCO Unistrut Depth (mm) 0.6 0.9 1.2 1.5 1.825 2.125 2.425 2.725 3.025 3.65
S9BB P5001 165 1000 975 975 975 975 875 750 675 600 500
S1BB P5501 124 750 750 750 725 600 525 450 400 350 300
S2BB P100A 83 500 500 450 350 325 250 225 200 175 125
S1 P5500 62 625 425 300 250 200 175 150 125 100 100
S2 P1000 42 325 200 150 125 100 75 75 50 50 50
S8 P3000 35 250 150 125 75 75 50 50 50 25 25
S5 P4400 25 125 75 50 50 25 25 25 25 25 0

Contact Capital Seismic & Engineering Ltd if the application does not fit within the above parameters and we can provide a more detailed review.

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