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Stromberg 21 Series Light Medium Duty Rigid Caster

21 Series Light Medium Duty Casters

Supplier: Stromberg

Volume Discounts Apply

The 21 Series offers the same great features as the 20 Series casters, plus a swivel-bearing dust cap to prolong the swivel bearing life. Ideal for stock carts, bakery racks, food service equipment, sound or music equipment and more.

  • Bright zinc finish.
  • Dust cover helps protect swivel bearings.
  • Raceways and yoke hardened for extra strength.
  • Heavily embossed, formed steel upper and lower cup.
  • Double row ball bearing swivel raceway construction.
  • Octagon top raceway is available.
  • Bolt hole spacing: 1-3/4"x2-15/16" to 2-3/8"x3-3/8".
  • Overall size: 2-3/8"x3-5/8".
  • Attaching bolt size: 5/16".


Note: Casters priced below are equipped with A1 mounting plate. More mounting options can be found in the Options tab.

FOB: West Coast Warehouse.

  • Model Info

70 models for 21 Series Light Medium Duty Casters

  • Prices subject to change without notice

Products without prices are not available for purchase through our shopping cart.

If you are interested in these products, add them to your quote list by clicking the red button below.

Model No. Style Wheel Size Type Bearing Axle Diameter Overall Height Swivel Radius Load Capacity Price Ea. Qty
S21-30-S-A1-SR Swivel 3" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 4-1/4" 2-3/4" 125 lbs. $7.03
S21-30-S-A1-SBB Swivel 3" Diameter x 1-1/4" Tread Width Soft Rubber Ball 3/8" 4-1/4" 2-3/4" 125 lbs. $9.12
S21-30-S-A1-HR Swivel 3" Diameter x 1-1/4" Tread Width Hard Rubber Nylon 3/8" 4-1/4" 2-3/4" 220 lbs. $7.03
S21-30-S-A1-HBB Swivel 3" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 4-1/4" 2-3/4" 220 lbs. $9.12
S21-30-S-A1-LP Swivel 3" Diameter x 1-1/4" Tread Width Light Duty Plastic Plain 3/8" 4-1/4" 2-3/4" 220 lbs. $6.18
S21-30-S-A1-HP Swivel 3" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 4-1/4" 2-3/4" 300 lbs. $6.68
S21-30-S-A1-PU Swivel 3" Diameter x 1-1/4" Tread Width Polyurethane Plain 3/8" 4-1/4" 2-3/4" 220 lbs. $8.99
S21-30-S-A1-PB Swivel 3" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 4-1/4" 2-3/4" 220 lbs. $10.75
S21-30-S-A1-INF Swivel 3" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 4-1/4" 2-3/4" 155 lbs. $9.68
S21-30-S-A1-SS Swivel 3" Diameter x 1-1/4" Tread Width Steel Plain 3/8" 4-1/4" 2-3/4" 250 lbs. $8.86
S21-35-S-A1-SR Swivel 3 1/2" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 4-11/16" 3-1/16" 130 lbs. $9.65
S21-35-S-A1-HR Swivel 3 1/2" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 4-11/16" 3-1/16" 225 lbs. $9.65
S21-35-S-A1-HP Swivel 3 1/2" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 4-11/16" 3-1/16" 300 lbs. $10.67
S21-35-S-A1-PB Swivel 3 1/2" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 4-11/16" 3-1/16" 260 lbs. $12.05
S21-35-S-A1-INF Swivel 3 1/2" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 4-11/16" 3-1/16" 220 lbs. $10.25
S21-35-S-A1-RA Swivel 3 1/2" Diameter x 1-1/4" Tread Width Gray Rubber or Aluminum Annular 3/8" 4-11/16" 3-1/16" 225 lbs. $10.79
S21-40-S-A1-SR Swivel 4" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 5-1/8" 3-5/16" 165 lbs. $8.52
S21-40-S-A1-SBB Swivel 4" Diameter x 1-1/4" Tread Width Soft Rubber Ball 3/8" 5-1/8" 3-5/16" 165 lbs. $10.31
S21-40-S-A1-HR Swivel 4" Diameter x 1-1/4" Tread Width Hard Rubber Nylon 3/8" 5-1/8" 3-5/16" 265 lbs. $8.52
S21-40-S-A1-HBB Swivel 4" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 5-1/8" 3-5/16" 265 lbs. $10.31
S21-40-S-A1-LP Swivel 4" Diameter x 1-1/4" Tread Width Light Duty Plastic Plain 3/8" 5-1/8" 3-5/16" 225 lbs. $6.64
S21-40-S-A1-HP Swivel 4" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 5-1/8" 3-5/16" 300 lbs. $7.92
S21-40-S-A1-PB Swivel 4" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 5-1/8" 3-5/16" 275 lbs. $12.13
S21-40-S-A1-RA Swivel 4" Diameter x 1-1/4" Tread Width Gray Rubber on Aluminum Annular 3/8" 5-1/8" 3-5/16" 265 lbs. $12.31
S21-40-S-A1-INF Swivel 4" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 5-1/8" 3-5/16" 240 lbs. $11.14
S21-40-S-A1-SS Swivel 4" Diameter x 1-1/4" Tread Width Steel Plain 3/8" 5-1/8" 3-5/16" 300 lbs. $15.78
S21-50-S-A1-SR Swivel 5" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 6-7/32" 3-31/32" 175 lbs. $10.44
S21-50-S-A1-SBB Swivel 5" Diameter x 1-1/4" Tread Width Soft Rubber Ball 3/8" 6-7/32" 3-31/32" 175 lbs. $10.67
S21-50-S-A1-HR Swivel 5" Diameter x 1-1/4" Tread Width Hard Rubber Nylon 3/8" 6-7/32" 3-31/32" 275 lbs. $10.44
S21-50-S-A1-HBB Swivel 5" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 6-7/32" 3-31/32" 300 lbs. $11.98
S21-50-S-A1-LP Swivel 5" Diameter x 1-1/4" Tread Width Light Duty Plastic Plain 3/8" 6-7/32" 3-31/32" 230 lbs. $7.79
S21-50-S-A1-HP Swivel 5" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 6-7/32" 3-31/32" 320 lbs. $8.83
S21-50-S-A1-PB Swivel 5" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 6-7/32" 3-31/32" 240 lbs. $10.73
S21-50-S-A1-INF Swivel 5" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 6-7/32" 3-31/32" 240 lbs. $12.54
S21-50-S-A1-RA Swivel 5" Diameter x 1-1/4" Tread Width Gray Rubber on Aluminum Annular 3/8" 6-7/32" 3-31/32" 265 lbs. $16.54
S21-30-R-A1-SR Rigid 3" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 4-1/4" 2-3/4" 125 lbs. $5.18
S21-30-R-A1-SBB Rigid 3" Diameter x 1-1/4" Tread Width Soft Rubber Ball 3/8" 4-1/4" 2-3/4" 125 lbs. $7.07
S21-30-R-A1-HR Rigid 3" Diameter x 1-1/4" Tread Width Hard Rubber Nylon 3/8" 4-1/4" 2-3/4" 220 lbs. $5.18
S21-30-R-A1-HBB Rigid 3" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 4-1/4" 2-3/4" 220 lbs. $7.07
S21-30-R-A1-LP Rigid 3" Diameter x 1-1/4" Tread Width Light Duty Plastic Plain 3/8" 4-1/4" 2-3/4" 220 lbs. $4.19
S21-30-R-A1-HP Rigid 3" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 4-1/4" 2-3/4" 300 lbs. $4.62
S21-30-R-A1-PU Rigid 3" Diameter x 1-1/4" Tread Width Polyurethane Plain 3/8" 4-1/4" 2-3/4" 220 lbs. $6.95
S21-30-R-A1-PB Rigid 3" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 4-1/4" 2-3/4" 220 lbs. $8.66
S21-30-R-A1-INF Rigid 3" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 4-1/4" 2-3/4" 155 lbs. $7.64
S21-30-R-A1-SS Rigid 3" Diameter x 1-1/4" Tread Width Steel Plain 3/8" 4-1/4" 2-3/4" 2250 lbs. $6.86
S21-35-R-A1-SR Rigid 3 1/2" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 4-11/16" 3-1/16" 130 lbs. $7.97
S21-35-R-A1-HR Rigid 3 1/2" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 4-11/16" 3-1/16" 225 lbs. $7.97
S21-35-R-A1-HP Rigid 3 1/2" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 4-11/16" 3-1/16" 300 lbs. $8.74
S21-35-R-A1-PB Rigid 3 1/2" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 4-11/16" 3-1/16" 260 lbs. $9.32
S21-35-R-A1-INF Rigid 3 1/2" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 4-11/16" 3-1/16" 220 lbs. $8.33
S21-35-R-A1-RA Rigid 3 1/2" Diameter x 1-1/4" Tread Width Gray Rubber on Aluminum Annular 3/8" 4-11/16" 3-1/16" 225 lbs. $8.39
S21-40-R-A1-SR Rigid 4" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 5-1/8" 3-5/16" 165 lbs. $6.78
S21-40-R-A1-SBB Rigid 4" Diameter x 1-1/4" Tread Width Soft Rubber Ball 3/8" 5-1/8" 3-5/16" 165 lbs. $8.52
S21-40-R-A1-HR Rigid 4" Diameter x 1-1/4" Tread Width Hard Rubber Nylon 3/8" 5-1/8" 3-5/16" 265 lbs. $6.78
S21-40-R-A1-HBB Rigid 4" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 5-1/8" 3-5/16" 265 lbs. $8.52
S21-40-R-A1-LP Rigid 4" Diameter x 1-1/4" Tread Width Light Duty Plastic Plain 3/8" 5-1/8" 3-5/16" 225 lbs. $4.91
S21-40-R-A1-HP Rigid 4" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 5-1/8" 3-5/16" 300 lbs. $6.18
S21-40-R-A1-PB Rigid 4" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 5-1/8" 3-5/16" 275 lbs. $10.08
S21-40-R-A1-RA Rigid 4" Diameter x 1-1/4" Tread Width Gray Rubber on Aluminum Annular 3/8" 5-1/8" 3-5/16" 265 lbs. $11.41
S21-40-R-A1-INF Rigid 4" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 5-1/8" 3-5/16" 240 lbs. $7.97
S21-40-R-A1-SS Rigid 4" Diameter x 1-1/4" Tread Width Steel Plain 3/8" 5-1/8" 3-5/16" 300 lbs. $14.03
S21-50-R-A1-SR Rigid 5" Diameter x 1-1/4" Tread Width Soft Rubber Nylon 3/8" 6-7/32" 3-31/32" 175 lbs. $8.41
S21-50-R-A1-SBB Rigid 5" Diameter x 1-1/4" Tread Width Soft Rubber Ball 3/8" 6-7/32" 3-31/32" 175 lbs. $9.98
S21-50-R-A1-HR Rigid 5" Diameter x 1-1/4" Tread Width Hard Rubber Nylon 3/8" 6-7/32" 3-31/32" 275 lbs. $8.41
S21-50-R-A1-HBB Rigid 5" Diameter x 1-1/4" Tread Width Hard Rubber Ball 3/8" 6-7/32" 3-31/32" 300 lbs. $9.98
S21-50-R-A1-LP Rigid 5" Diameter x 1-1/4" Tread Width Light Duty Plastic Plain 3/8" 6-7/32" 3-31/32" 230 lbs. $5.81
S21-50-R-A1-HP Rigid 5" Diameter x 1-1/4" Tread Width Heavy Duty Plastic Plain 3/8" 6-7/32" 3-31/32" 320 lbs. $6.84
S21-50-R-A1-PB Rigid 5" Diameter x 1-1/4" Tread Width Polyurethane Ball / Delrin 3/8" 6-7/32" 3-31/32" 240 lbs. $8.71
S21-50-R-A1-INF Rigid 5" Diameter x 1-1/4" Tread Width Infiniti Annular / Delrin 3/8" 6-7/32" 3-31/32" 240 lbs. $10.55
S21-50-R-A1-RA Rigid 5" Diameter x 1-1/4" Tread Width Gray Rubber on Aluminum Annular 3/8" 6-7/32" 3-31/32" 265 lbs. $14.52
Difference between Cart and Quote

5 Options Available for 21 Series Light Medium Duty Casters

21 Series Light Medium Duty Casters Option Image

Top Plate for Stromberg S21 Light Medium Duty Casters

Model No. Overall Size Bolt Hole Spacing Attaching Bolt Size Price Ea. Qty
A1-S21 2 1/2" x 3 5/8" 1 3/4" x 2 7/8 to 3" 5/16" Call for Pricing
A2-S21 3 1/8" x 4 1/8" 1 3/4" x 3" to 2 3/8" x 3 3/8" 3/8" $0.47
A3-S21 3 15/17" x 4 1/2" 2 5/8" x 3 5/8" to 3" x 3" 3/8" $0.90
A4-S21 3 1/2" x 3 1/2" 2 7/16" x 2 7/16" 1/4" $0.90

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21 Series Light Medium Duty Casters Option Image

Threaded Stem for Stromberg S21 Light Medium Duty Casters

Model No. Specification Price Ea. Qty
B1-S21 1/2" x UNC13 x 1 1/2" $0.20
B2-S21 1/2" x UNC13 x 2 3/4" can be used with EXP applicator $0.58

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21 Series Light Medium Duty Casters Option Image

Square Stem for Stromberg S21 Light Medium Duty Casters

Model No. Specification Price Ea. Qty
C1-S21 7/8" x 2" 1/4" hole up 1 from top of the upper caster. $0.20
C2-S21 7/8" x 2 1/2" 1/4" hole up 1/8 from top of the upper caster. $0.58

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21 Series Light Medium Duty Casters Option Image

Grip Ring Stem for Stromberg S21 Light Medium Duty Casters

Model No. Specification Price Ea. Qty
D1-S21 7/8" x 2 7/16" $0.76
D2-S21 27/32" x 2 1/2" $0.76
D4-S21 27/32" x 2 1/2" $1.26

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Accessories and Options for S21 Series Casters

Model No. Description Price Ea. Qty
TB-S21 Top Lock Brake $1.44
TG-S21 Thread Guard $0.40
ZA-S21 Zerk Axle Call for Pricing
SL-S21 Sealed Swivel Call for Pricing
EP-S21 Expanded Applicator Call for Pricing
CP-S21 Chrome Plating Call for Pricing
NI-S21 Nickel Plating Call for Pricing

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