Specification Brand : Service Caster BulletPoint1 : These Service Caster Series #20 Polyurethane casters offer various wheel sizes and mounting heights: 3” Wheel: 4-1/8” mounting height; 3-1/2” wheel: 4-5/8” mounting height; 4” wheel: 5-1/8” mounting height; 5” wheel: 6-1/8” mounting height; 6” wheel: 7-1/8” mounting height. Wheels are offered in five different colors – Gray, Blue, Black, Maroon, and Red. BulletPoint2 : Weight Capacity: 3" and 3.5": 300 lbs Capacity/Caster; 4", 5", and 6": 350 lbs Capacity/Caster BulletPoint3 : All casters feature an expanding stem that is 2-11/16” in length. The expanding stem comes in 10 different diameters: (3/4”, 7/8”, 1”, 1-1/8”, 1-1/4”, 1-3/8”, 1-1/2”, 1-5/8”, 1-3/4”, and 1-7/8”). Before ordering, Service Caster recommends measuring the inside diameter of your tubing- this measurement will determine the corresponding expanding stem diameter needed. Not sure how to measure or don't see the size you need? Call us or send us a message. BulletPoint4 : Brake options include a top lock brake (TLB), a total lock brake (TTL), or a posi lock brake (PLB). The top lock brake (TLB) and the posi lock brake (PLB) places a positive locking force against the wheel tread locking the wheel only. The total lock brake (TTL) also places a positive locking force against the wheel tread, but the total lock brake (TTL) simultaneously locks the wheel and the swivel for a complete stationary position. BulletPoint5 : Find other wheel materials, sizes and all Service Caster products at our Amazon Storefront. Click on the “by Service Caster” link above the main title on any Service Caster page listing. Color : 4 Swivel - 2 w/Posi Lock Brakes - 1" Stem CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier1 : 0734005168501 ExternallyAssignedProductIdentifier2 : 734005168501 Hazmat : auto-grounding IncludedComponents : 5*3/8"-16 Threaded Screw Inserts ItemName : Polyurethane Swivel Expanding Stem Caster Set of 4 with 3.5 Inch Gray Wheels and 1" Stems - Includes 2 with Posi Locking Brakes - 1200 lbs Total Capacity - Service Caster Brand ItemPackageDimensions_Height : 20.701 centimeters ItemPackageDimensions_Length : 10.6934 centimeters ItemPackageDimensions_Width : 13.208 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : stem-casters LoadCapacity : 650.00 pounds LoadIndex : 88.25 Manufacturer : Service Caster Material : Polyurethane Tread on Polyolefin Core ModelName : Series #20 ModelNumber : Series #20 MountingType : Stem Mount NumberOfItems : 4 PackageLevel : unit PartNumber : SCC-EX20S3514-PPUB-2-PLB-2-1 PitchCircleDiameter : 127 millimeters ProductDescription : When searching for a reliable and durable solution to your caster needs, look no further than the Service Caster Series 20 expanding stem gray polyurethane wheel casters. The Series #20 features an innovative expanding stem that can easily adapt to the inside diameter of the opening, allowing for a secure fit in round or square tubes. Simply tighten the topmost knurled nut to compress the rubber for a snug fit. For added security, further compress the rubber with a wrench via the nut under the swivel raceway. Finely crafted with a bright zinc plated finish, heat-treated ball bearing raceway, and a gray polyurethane wheel, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward. Service Caster ProductSiteLaunchDate : 2024-02-12T17:38:54.682Z Size : 3.5" Wheel Style : 3/8" Threaded Stem(English Unit) SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable SurfaceRecommendation : Multi-Surface UnitCount : 5 WebsiteShippingWeight : 7.4 pounds