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4″ Polyolefin – Total Lock Stem Model K3A ML

$28.69

PN: K3APB4BX-ML
In Stock
Please select any add ons you require for your caster and if you are selecting multiple option types, add all of the quantity for the first choice and then make your selections for the second, third, fourth, etc… choices. (Example: 2 With Brakes and 2 Without Brakes)

Click Here To See Stem Options (Modular Stems available for variety of fastening needs)

HK1/2 | HK1/2 - Single 1/2" Bolt Hole For Your Bolt +$1.00TS21 | TS21 - Threaded Stem 1/2" - 13 x 1" LongTS22 | TS22 - Threaded Stem 1/2"- 13 x 1-1/2" LongTS23 | TS23 - 1/2"-13x2" Threaded Stem +$1.00TS61 | TS61 - Threaded Stem 3/8"-16 x 1" LongTS62 | TS62 - Threaded Stem 3/8"-16 x 1-1/2" LongTS26N | TS26N - Threaded Stem 1/2"-13 x 2-3/4" Long +$1.00TS5/8 | TS5/8 - Threaded Stem 5/8"-11 x 1-3/4" Long +$7.00TS3/4 | TS3/4 - Threaded Stem 3/4"-10 x 1-3/4" Long +$7.00TSC1 | TSC1 - Threaded Stem 1/2"-13 x 4" Long +$20.00TSC2 | TSC2 - Threaded Stem 5/8"-11 x 4" Long +$20.00TSC3 | TSC3 - Threaded Stem 3/4"-10 x 6" Long +$20.00RD3/4 | RD3/4 - 3/4"x 2" Round Metal Stem w/ 3 cross drilled holes +$8.00GR82 | GR82 – Dual Grip Ring Stem 1-1/8″ Diameter x 2-3/16″ Long +$10.00GR91 | GR91 - Grip Ring Stem 7/16" Diameter x 1-3/8" Long +$10.00GR95 | GR95 - Grip Ring Stem .846" x 2-3/16" (For 7/8" Inner Diameter "Metro" Shelving) +$10.00SQ7/8-GR | SQ7/8-GR - 7/8" Plain Square Grip Ring (To Drill Your Own Cross-Holes) +$10.00SQ3/4 | SQ3/4 - 3/4" Square-3 Cross Holes +$10.00SQ7/8 - 7/8" Square-3 Cross Holes +$10.00ER9 | ER9 - Expanding Rubber for 3/4" Inner Diameter +$10.00ER27 | ER27 - Expanding Rubber for 7/8" Inner Diameter +$10.00ER28 | ER28 - Expanding Rubber for 1" Inner Diameter +$10.00ER29 | ER29 - Expanding Rubber for 1-1/8" Inner Diameter +$10.00ER17 | ER17 - Expanding Rubber for 1-1/4" Inner Diameter +$10.00ER25 | ER25 - Expanding Rubber for 1-3/8" Inner Diameter +$10.00ER26 | ER26 - Expanding Rubber for 1-1/2" Inner Diameter +$10.00ER21 | ER21 - Expanding Rubber for 1-13/16" Inner Diameter +$10.00

Get this caster in ALL BLACK FINISH instead of zinc finish. Axle is also black.

NoneBLACK | BLACK FINISH Instead Of ZINC FINISH +$5.00
Volume Pricing on Inquiry. Call us: 800-501-3808

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Technical Specifications

4
Wheel Diameter
4
Ollie Recommends!
Caster City Recommendation
Ollie Recommends!
Yes
Non-Marking
Yes
60D ± 5
Durometer
60D ± 5
1 1/4
Wheel Width
1 1/4
Plain
Wheel Bearing
Plain
300 lbs
Maximum Capacity (lbs)
300 lbs
5"
Overall Height
5"
5
Swivel Radius
5
ER17ER21ER25ER26ER27ER28ER29ER9HK1/2TS22TS26NTS3/4TS5/8TSC1TSC2TSC3
Zinc Stem Add Ons
ER17, ER21, ER25, ER26, ER27, ER28, ER29, ER9, HK1/2, TS22, TS26N, TS3/4, TS5/8, TSC1, TSC2, TSC3
LA
Lube Axle Code
LA
Weight
Weight
2 lbs

Description

4″ Black Donut Polyolefin Wheel. Ball Bearings in the Wheel. Shown with 5″ wheel. All K3A institutional stem casters are made from stamped steel and zinc plated to resist corrosion. This institutional stem caster is assembled with a ⅜” diameter axle bolt, and this stem caster uses a ½” rivet to hold the swivel bearing together.   Stem Caster Model K3A  caster brackets have two rows of ball bearings rotating on raceways for smoother swiveling. There is a solid cover over the swivel raceways to shield them from dirt and dust.   This stem caster performs best if you limit the load to no more than 1000 lbs on a set of 4 model 3 casters. The Total Lock Stem Caster K3A will amaze you at their performance!

Polyolefin Caster Wheels are injection molded from a blend of thermoplastic polymers forming a one piece solid sanitary design. These Polyolefin wheels are especially suited for wet and corrosive applications. They are very resistant to most commonly encountered liquids. Polyolefin wheels have a lower capacity and a more limited temperature range than Nylon wheels. In a cold dry environment, such as a refrigerated store room, Polyolefin wheels may become brittle. They should not be used in a freezer or a heat application above 180°F intermittent usage, such as a rack washer.

This donut shaped wheel comes with sealed ball bearings in the wheel. It’s tread shape enables it to change directions much more easily.

*video shown is with the 5″ Wheel* For more information and help placing an order, give us a call at 800-501-3808.

Application Use for Total Locking K3A Casters

  • Material Handling and Stocking Carts
    • Moving dollies for transporting supplies in warehouses or institutional facilities.
    • Stocking carts for restocking shelves in libraries, schools, or offices.
    • Utility carts for general-purpose transport in institutional environments.
  • Medical and Laboratory Equipment
    • Medical equipment carts for transporting tools in hospitals or clinics.
    • Laboratory equipment stands in science and animal labs for secure positioning.
    • Electronic and diagnostic equipment carts for stable mobility during use.
    • Hospital bedside carts for patient care items, ensuring immobility during use.
    • Surgical carts for holding instruments, locked in place during procedures.
    • Pharmacy carts for dispensing medications in pharmaceutical settings.
  • Food Service and Kitchen Equipment
    • Food service carts for delivering meals in hospitals or cafeterias.
    • Bakery equipment carts for moving dough or baked goods in institutional kitchens.
    • Kitchen equipment stands for appliances like mixers, ensuring stability during operation.
    • Beverage carts for serving drinks in dining halls or catering setups.
    • Prep tables on wheels for food preparation, locked for safety during use.
  • Office and IT Equipment
    • Office equipment stands for printers, copiers, or scanners in institutional offices.
    • Computer equipment stands for workstations in computer labs or offices.
    • Computer room equipment carts for servers or networking devices, ensuring immobility.
    • Mobile filing cabinets for secure document storage and transport in offices.
    • AV carts for projectors or monitors in conference rooms or classrooms.
  • General Institutional Equipment
    • Hospital utility carts for linens, cleaning supplies, or medical waste.
    • School equipment carts for moving supplies like books or art materials.
    • Pharmaceutical manufacturing carts for transporting materials in cleanroom environments.
    • Maintenance carts for tools and repair supplies in institutional facilities.
    • Laundry carts in hospitals or dormitories for transporting linens.
    • Library carts for moving books or media in educational institutions.
  • Workshop and Industrial Settings
    • Worktables in workshops for holding tools or materials, locked during use.
    • Tablesaws on mobile bases for woodworking in vocational schools or workshops.
    • Tool carts for mechanics or technicians in institutional maintenance shops.
    • Assembly line carts for small-scale manufacturing in training facilities.
    • Welding carts for holding equipment in trade schools or workshops.
  • Specialized Institutional Applications
    • Janitorial carts for cleaning supplies in hospitals, schools, or offices.
    • Classroom carts for mobile teaching aids like whiteboards or projectors.
    • Mailroom carts for sorting and distributing mail in offices or universities.
    • Audio-visual carts for sound equipment in auditoriums or theaters.
    • Examination table carts in clinics for patient care setups.
    • Mobile storage units for archival materials in museums or libraries.
  • Corrosion-Resistant Environments (Model K3A Specific)
    • Marine application carts for coastal institutional facilities.
    • Wet environment carts in hospital sterilization rooms or labs.
    • Corrosive environment carts in pharmaceutical manufacturing with chemical exposure.
    • Outdoor utility carts for institutional grounds maintenance in harsh weather.

TYPES OF STEMS FOR THIS MODEL

NO STEM:

  • HK1/2 – Single 1/2″ Hole For Your Own 1/2″ Diameter Bolt

THREADED STEMS:

  • TS61 – Threaded Stem 3/8″-16 x 1″ Long
  • TS22 – Threaded Stem 1/2″-13 x 1-1/2″ Long
  • TS26N – Threaded Stem 1/2″-13 x 2-3/4″ Long
  • TS-S1 – Threaded Stem 1/2″-13 x 4″ Long
  • TS-S2 – Threaded Stem 5/8″-11 x 4″ Long
  • TS-S3 – Threaded Stem 3/4″-10 x 6″ Long
  • TS-S7 – Threaded Stem 3/4″-10 x 4″ Long

GRIP-RING STEMS + SQUARE AND ROUND METAL STEMS: 

  • GR91 – Grip Ring Stem 7/16″ Diameter x 1-3/8″ Long
  • GR95 – Grip Ring Stem .846″ x 2-3/16″ (For 7/8″ Inner Diameter “Metro” Shelving)
  • SQ7/8-GR – 7/8″ Plain Square Grip Ring (To Drill Your Own Cross-holes)
  • RD3/4 – 3/4″ Round – 3 Cross Holes
  • SQ3/4 – 3/4″ Square – 3 Cross Holes

EXPANDING RUBBER STEMS:

  • ER9 – Expanding Rubber for 3/4″ Inner Diameter
  • ER27 – Expanding Rubber for 7/8″ Inner Diameter
  • ER28 – Expanding Rubber for 1″ Inner Diameter
  • ER29 – Expanding Rubber for 1-1/8″ Inner Diameter
  • ER17 – Expanding Rubber for 1-1/4″ Inner Diameter
  • ER25 – Expanding Rubber for 1-3/8″ Inner Diameter
  • ER26 – Expanding Rubber for 1-1/2″ Inner Diameter
  • ER21 – Expanding Rubber for 1-13/16″ Inner Diameter

Polyolefin Caster Wheels from Caster City

Polyolefin Caster Wheels are injection molded from a blend of thermoplastic polymers, forming a one-piece solid sanitary design that prioritizes durability and hygiene. These wheels are available with a plain bore, precision sealed ball bearings, roller bearings, or Delrin bearings for smooth operation across various light to medium-duty applications. As a cost-effective and lightweight option, polyolefin wheels are hard, non-marking, and non-conductive, offering superior resistance to water, chemicals, solvents, acids, grease, oils, and gasoline. Their unique composition ensures excellent abrasion resistance and impact absorption, making them a reliable choice for environments where sanitation and floor protection are essential.

Polyolefin Caster Wheels are particularly suited for wet and corrosive applications due to their outstanding resistance to most commonly encountered liquids, ensuring long-lasting performance. Their slightly crowned tread enhances rollability and maneuverability, and they do not develop flat spots when parked for extended periods. With a hardness of 65–70 Shore D, these wheels provide floor protection, low noise, and easy cleaning, while remaining impervious to sterilization processes. However, they can become brittle in cold, dry environments like refrigerated storerooms and should not be used in freezers or heat applications above 180°F during intermittent usage, such as rack washers.

Ideal for bakeries, food processing, dairies, meat packaging, laundries, supermarkets, warehouses, manufacturing plants, cleanrooms, medical facilities, and offices, these wheels excel where chemical resistance and non-marking performance are critical. Capable of handling impacts and loads up to 900 lbs per wheel depending on size, they offer economical mobility in harsh conditions. For reliable, sanitary, and floor-friendly caster solutions tailored to your needs, contact Caster City to explore custom configurations of our durable Polyolefin Caster Wheels.

FAQ

What is the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel, and what’s it used for?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel is our zinc-plated institutional caster, a light duty industrial caster shipped from Texas, Ohio, or Washington, designed for manually moved applications where cargo needs to remain stationary, with a capacity of 350 lbs per caster (250 lbs for the 3” wheel). It uses 1-¼” wide “PB” Polyolefin wheels in 3”, 4”, and 5” diameters, featuring a unique nylon brake that locks the swivel bearing and wheel simultaneously when the black nylon pedal is used, recommended by Caster City for its ease of use, easy engagement and disengagement, and benefits for users engaging it with the tip of their shoe—reducing resistance, increasing usage likelihood, and minimizing shoe scratches. This total lock caster is ideal for standing loads that move infrequently, such as institutional settings like schools, hospitals, or warehouses, and is amazing for washdowns due to its sanitary design, ensuring secure footing and keeping equipment immobile, with a 5” swivel radius for all sizes and capacity ratings based on weight directly on the swivel bearing. Threaded stem options are available—contact us at sales@castercity.com or 800-501-3808 for specific sizes and recommendations. Please call us before placing more than 1000 lbs on four of these stem casters.

What’s the capacity of the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel has a capacity of 350 lbs per caster for 4” and 5” wheels, and 250 lbs for the 3” wheel, with ratings based on weight directly on the swivel bearing—contact us at sales@castercity.com or 800-501-3808 for guidance, and avoid exceeding 1000 lbs on a set of four.

What wheel sizes are available for the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel?

The Total Locking Stem Caster Model K3A uses 1-¼” wide “PB” Polyolefin wheels in 3”, 4”, and 5” diameters, with overall heights of 4-1/8” for the 3” wheel, 5-1/8” for the 4” wheel, and 6-1/4” for the 5” wheel, and a 5” swivel radius for all sizes.

What’s the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel used for?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel is ideal for standing loads that move infrequently, such as institutional settings like schools, hospitals, warehouses, or food service areas, and is amazing for washdowns, where a stem mount caster moves and keeps equipment stationary.

What brake feature does the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel have?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel features a unique nylon brake that locks the swivel bearing and wheel simultaneously when the black nylon pedal is used, recommended by Caster City for its ease of use.

Why is the nylon brake on the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel beneficial?

The nylon brake on the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel, activated by the black nylon pedal, is recommended by Caster City for its easy engagement and disengagement, reducing resistance and minimizing shoe scratches when users engage it with the tip of their shoe, increasing usage likelihood.

What material is the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel made from?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel is constructed from stamped steel with a zinc-plated frame, paired with 1-¼” wide “PB” Polyolefin wheels injection molded from a blend of thermoplastic polymers in a one-piece solid sanitary design, featuring a slightly crowned tread.

What applications are best for the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel is perfect for institutional applications like schools, hospitals, warehouses, food service areas, and wet or corrosive environments, where a stem mount caster moves and keeps equipment stationary, benefiting from its resistance to most common liquids and suitability for washdowns.

What bearing type comes with the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel comes standard with Precision Sealed Ball Bearings or plain bore options, enhanced by large oversized thread guards that also act as spanner bushings—contact us at 800-501-3808 or sales@castercity.com for additional details.

Can the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel roll on rough floors?

No, the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel is designed for smooth floors only—avoid use on rough floors, obstructions, or poor surfaces, which can damage this zinc-plated caster and shorten its life.

Are the Total Locking Stem Casters Model K3A with PB Polyolefin Wheel good for standing loads?

The Total Locking Stem Casters Model K3A with PB Polyolefin Wheel are an inexpensive, effective choice for standing loads that move infrequently—avoid overuse beyond 1000 lbs on four casters and contact us for guidance.

How do I protect the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel from damage?

Keep the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel free from shock, overloading beyond 350 lbs per caster (250 lbs for 3” wheel), abuse, obstructions, poor floors, impact, and exposure to excessive heat or chemicals beyond its limited temperature range, which can affect the caster’s performance and the zinc-plated construction, especially noting its unsuitability for high temperatures due to the nylon pedal.

Do the Total Locking Stem Casters Model K3A with PB Polyolefin Wheel leave marks on floors?

No, the 1-¼” wide “PB” Polyolefin wheels are non-marking, designed to protect floor surfaces in institutional settings.

Why is the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel good for institutional use?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel is good for institutional use because its total locking mechanism provides a secure footing and keeps cargo stationary, with the polyolefin offering resistance to wet and corrosive conditions and suitability for washdowns.

How does the nylon brake work on the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel?

The nylon brake on the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel locks the swivel bearing and wheel at the same time when the black nylon pedal is depressed, immobilizing the caster for stationary applications.

Why is the total locking mechanism on the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel important for safety?

The total locking mechanism on the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel prevents all caster movement when the black nylon pedal is used, ensuring safety during tasks where people lean against the worktable in institutional settings.

What makes the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel a trusted safety feature?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel’s total lock braking mechanism, activated by the black nylon pedal, immobilizes the swivel bearing and wheel, providing a trusted safety feature for stationary applications.

How does the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel enhance stability?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel enhances stability by locking the caster wheel and swivel bearing with the one-step black nylon pedal, keeping equipment firmly in place for standing loads.

What options are available for the Total Locking Stem Caster Model K3A with PB Polyolefin Wheel?

The Total Locking Stem Caster Model K3A with PB Polyolefin Wheel offers options including a LA – lube axle for certain wheels, a high volume item for Caster City—contact us for details.

Key Features

Construction: Stamped steel with zinc-plated frame
Weight Capacity: 350 lbs per caster for 4” and 5” wheels, 250 lbs for 3” wheel, recommended only for manually moved applications with standing loads that move infrequently, not to exceed 1000 lbs on a set of four
Wheel Sizes: 1-¼” wide “PB” Polyolefin wheels in 3”, 4”, and 5” diameters
Bearings: Precision Sealed Ball Bearings or plain bore (standard) with large oversized thread guards acting as spanner bushings
Brake Options: Total locking brake with black nylon pedal
Fastener Type: Threaded stem options (TST1: 3/8-16 x 1-1/8”, TS82: 3/8-16 x 1-1/2”, TS22: 1/2-13 x 1-1/2”, TS26N: 1/2-13 x 2-3/4”, TS5/8: 5/8-11 x 1-3/4”, TS3/4: 5/8-11 x 4”, TSC1: 3/4-10 x 1-3/4”, TSC2: 3/4-10 x 2-3/4”, TSC3: 3/4-10 x 6”), with LA – lube axle option for certain wheels
Overall Heights: 4-1/8” (3” wheel), 5-1/8” (4” wheel), 6-1/4” (5” wheel)
Swivel Radius: 5” for all sizes with total locking brake
Applications: Schools, hospitals, warehouses, food service areas

Our #1 goal is to help you find the best caster and wheels for your needs. If you need help finding the right casters, contact our team of professionals. You can also customize many of our casters with a variety of options such as swivel locks, wheel brakes and zerk fittings. We ship our products from assembly plants in Georgia, Pennsylvania, Virginia, Texas, Nevada and Canada. Whether you’re a one-man shop or a global giant, we can provide you with: We specialize in Business to Business, however, consumer orders are gladly accepted and we can provide you with:

  • Fastest Lead Time in the Industry
  • Caster performance data.
  • Comparative data.
  • Customized caster solutions.
  • Help with caster solutions.
  • Case studies by industry or application.
  • Manufacturer and Distributor of over $25 million dollars in Finished Component Parts 
  • Majority of Orders Processed and Shipped in 2 Days or Less
Call us during the design phase of your project, we can help you avoid costly modifications once fabrication has started. We guarantee what we recommend.Industrial & Heavy Duty Casters | Caster City

If you have any questions about your measurements, please call 800-501-3808