Bushings

Bushings - Urethane, Rubber, Bronze

Bushings are what hold everything else in place. When bushings and torque rods begin to show wear, the overall suspension can no longer perform as it should. Atro's polyurethane bushings (also known as "poly" or "urethane" bushings) should be the first place you look for slowing down the aging process and reducing wear. Urethane is now being copied for bushings made by other suppliers but Atro is leading the way by using more than one urethane formulation and has expanded the use of polyurethane to more truck components than any other supplier.

Plaza also stocks bronze and rubber bushings by Dayton Parts for special applications or when you do not need the long life of polyurethane. Note some minor differences in terminology. Dayton Parts produces a broad range of bushings and includes metal bushings when referring to “bushings”. Dayton Parts also uses the term “cartridge” occasionally when Atro refers to the same part as a bushing.

Click on the Video at the right to hear why Atro bushings help you to keep your truck in service and eliminate the more frequent replacement of rubber bushings.

How Atro Has Engineered Bushings

Atro has made two breakthroughs in solving many problems inherent in the use of rubber for torque rod bushings. Not only are they using polyurethane in place of the rubber, but they have re-engineered how the bushing is attached.

The difference in design is that the Atro bushing surrounds a freely rotating pin so that no tension is put on the bushing when the torque rod is installed. The benefit is that an Atro bushing is free from the twisting and tearing action found in other bushings.

The difference in wear resistance is that the bushing material is not only resistant to solvents such as oil and grease, but the hardness of the polyurethane in Atro products is engineered to optimize the wear resistance and performance of the part in specific applications. For example, on a scale of 1 to 100 the hardness of a rubber tire tread ranges from 50 to 70. An Atro torque rod bushing may measure 90 on the same scale. An Atro motor mount may be 85 and an Atro pad or load cushion may measure 68. Follow this link to see the variety of components that Atro has improved with engineered polyurethane.

Atro pn PL1146 straddle type torque rod bushing

Hendrickson 47691 straddle mount torgue rod bushing made by Atro (also referred to as a 'cartridge')

Styles of Torque Rod Bushings: Hollow Sleeve, Straddle Mount, Straddle Mount - offset, Taper Stud

The original Atro bushings are already a good product but they have not stopped improving on them. They recognized that severe duty also requires resistance to metal corrosion and so they have begun to add a zinc coating. If you have a Hendrickson walking beam suspension you can take advantage of this feature for the bar pin beam end bushings. See Atro’s flyer announcing their ULTRABUSHING for Hendrickson, Kenworth, Peterbilt, and Freightliner applications.

Urethane works for autos

Polyurethane bushings, not surprisingly, are recommended for higher performance in an automobile chassis. Read more from an automotive guy who says “Because rubber is a biodegradable product it is affected by ozone and will over time rot and degrade, while urethane will keep going and going.”

Other uses for polyurethane - motor mounts, load pads, springs

Mack - 204SX389 Urethane Motor Mounts- Atro pn KT62-62389

Mack Upper Insulator or load pad pn 10QK370

Hendrickson Auxiliary Spring in Polyurethane

Hendrickson 60314-000 Auxiliary Spring Atro pn LP50-24974

Below are some of the most popular Atro and Dayton Parts BUSHINGS in our stock now. If the bushing you need is not on this list please call so that we can help to cross-reference an aftermarket part to your original equipment number.

Atro Bushings
EB50-21013	Hendrickson pn 34013-87,88 urethane bar pin end ultrabushing kit
CB38011	Hendrickson pn 22282 urethane center beam bushing Kit
EB38000	Hendrickson pn 45900 urethane beam end bushing 5 3/4''Lg.
PL1146	Hendrickson pn 47691 urethane straddlemount bushing 5/8' bolts
AK38200	Hendrickson pn 21140-34, adapter kit for beam end bushing
TS38000	Mack, Hendrickson pn 44695, 227720 urethane straddle bushing 5/8' bolts
MA10000	Mack pn 10QK276 urethane 8 3/4' trunnion bushing
TT38000	Navistar, Kenworth pn 44697, 1693066C1, 229610 torque rod bushing
PL1046	Chalmers PN 800010 urethane bushing

Dayton Parts Bushings
334-830	Hendrickson pn 34013-87 rubber bar-pin bushing kit non shim
321-126	Hendrickson pn 45900 Rubber Beam End Bushing 5 3/4''Lg.
322-102	Hendrickson pn 30437 Bushing Kit, Bronze Center
321-123	Hendrickson pn 22282 Rubber Center Bushing loose plug included
321-122	Hendrickson pn 5919 Rubber Center Bushing welded-in plug
321-118	Hendrickson pn 22279 Rubber Center Bushing loose plug included
321-117	Hendrickson pn 6664 Rubber Center Bushing welded-in plug
321-223	Hendrickson pn 47691 rubber straddlemount bushing 5/8' bolts
322-101	Hendrickson pn 30057-8 4' lg spring eye bushing
321-120	Hendrickson pn 6969 Rubber Beam End Bushing 5 1/4''Lg
321-132	Mack or Hendrickson PNs 44695, 227720 rubber straddle bushing 5/8' bolts
321-131	Mack PN 1688-227710 rubber straddle mount TR bushing 5/8' bolts
322-114	Mack pn 10QK157 bronze bushing 3 1/2''ID x 3 3/4''OD x 3 7/16''Lg
322-113	Mack pn 10QK158A bronze bushing 4''ID x 4 1/4''OD x 4 1/4''Lg.
321-133	Navistar, Kenworth pn 44697, 1693066C1, 229610 taper-pin rubber bushing
321-276	Chalmers PN 800010 rubber bushing
321-265	Peterbilt PN 227723 rubber straddlemount bushing 3/4' bolts

Complete Atro Interchange

If you need to find out whether Atro has a polyurethane version of your current part number try this cross reference of Atro part numbers to their competitors.