4 Wheel Trolley Assembly Rollers.Bearing Trolley Assembly.The top of The Trolley has Room for Set Screws, Allowing The use of a 1-5/8" high Strut Channel or Higher Metal Strut Channel.

1：Trolley material: Q235 alloy steel (after carburizing process, hardness 30±3HRC super wear resistance, while the internal still maintain a high toughness)2：Bearing type:SKF6200-RS1 (using first-class rubber ring sealed bearings, load-bearing capacity and life is more than 1.5 times that of steel ring bearings, the price is twice that of steel ring bearings) 3： The pin shaft for mounting the bearing: pin shaft is solid alloy steel pin shaft. 50 tons of press to pin shaft extrusion into the bearing inside, and bearing perfect combination, very strong, you do not need to worry about it will fall off (refused to use no safety hollow iron pin) after each pin shaft and bearing combination we will check it, to ensure that it is comfortable.To ensure smooth rolling of the bearing4: surface treatment process: cold galvanizing (to protect the steel from corrosion, anti-corrosion more effective and thorough;)5：You can use three strut channe and four Roller Trolley in conjunction to achieve the movement of the electric hoist in any direction.6:Don't worry about the Strut Channels mounting screws affecting the Roller Trolley's sliding back and forth .Roller Trolley Has a Height of 7mm(0.2756in) in the Center Space, so You can Choose a set Screw of 7mm(0.2756in) or Less When Installing the Strut Channel, Which Will not Obstruct the Back and Forth Sliding of the Trolley.

• Quantity: 2PCS.Maximum Load ：900lbs/1PCS
• Hoist Roller Trolley leaves a 7mm space at the top, the fixing screw can be installed inside the strut channel and will not affect the trolley sliding back and forth. No higher strut channel and Track Hanger Bracket are needed, saving the cost of the whole system.
• Trolley assembly for use With P1000, P1001 , P5000, P5001, P5500, P5501 and All 1-5/8" or Taller Strut Channel
• Quality of unistrut rollers: made of Q235 alloy steel, galvanized process. Adopt rubber ring seal bearing, with good sealing and long service life. Solid steel pin, with super load bearing capacity, safe and reliable.
• The B-4Wheel Trolley is available in one-piece, two-piece and four-piece packages. Go to the store for more styles of strut channel trolley