Our 40 series casters have been used in a wide variety of applications for many years and are the backbone of the material handling industry. The load ratings fit a wide variety of manufacturing and warehousing uses. Nearly every warehouse, freight terminal, manufacturing plant and industrial business uses these types of casters in their operations. The 40 series caster is the same as our standard 46 series casters except for 1-1/2" wide wheels. The rivet hydraulically compressed kingpin to increase strength of swivel section as compared to staking. Cold formed top plate, yoke and button are all heat treated to prevent brinelling, improve swivel action and increase service life. Load and thrust bearings are hardened and ground and rotate on hardened raceways. Top plate and legs are 1/4" steel. Legs are formed for increased strength and continuously welded to yoke. All swivel sections are equipped with a lubrication fitting for field maintenance. RWM lubricates all swivel sections prior to shipment. Notched yokes are standard. 1-1/2" tread wheel. This medium duty caster series is designed for use on scrap bins, parts boxes, dollies and racks. 1/2" Diameter drilled axle with lubrication fitting provided on all casters to improve ease of lubrication. Mounting plate size is 4" x 4-1/2" x 1/4".