Restore critical axle alignment and eliminate tracking shift on your heavy-duty suspension with the ATRO PL1146 Premium Polyurethane Torque Rod Bushing. Proudly Made in the USA, this heavy-duty straddle-mount bushing is engineered specifically to replace short-lived rubber components on rigorous vocational fleets, highway tractors, and commercial trailers.
Standard rubber bushings quickly twist, soften, and break down under intense torsional loads and constant exposure to chassis grease, motor oils, road salts, and hydraulic fluids. ATRO’s proprietary high-durometer polyurethane formula is chemically engineered to remain completely immune to these contaminants while offering unmatched tear strength. The PL1146 features a non-rotating straddle design engineered with a strict 4-3/8" bolt hole center-to-center measurement, providing maximum structural tracking control for Hendrickson, Freightliner FAS II, Mack, and Internationalsuspension networks.
Application Note: This bushing does NOT rotate. For an alternative premium option, see part number TS50-22691.
Non-Rotating Straddle Layout: Engineered to lock firmly into its structural orientation without internal rotational slippage, securing your suspension's true alignment.
Premium Polyurethane Chemistry: Outlasts traditional rubber replacements by resisting dry rot, ozone cracking, grease saturation, and high-load crushing.
Broad Vocational Coverage: Direct application compatibility across massive Class 8 vehicle platforms including Freightliner FAS II Airliner, Hendrickson HAS/HFS, and Mack suspensions.
Proudly Made in the USA: Manufactured to precise commercial tolerances for dependable, heavy-duty fleet reliability.
| Specification | Details |
|---|---|
| Manufacturer | ATRO Engineered Systems |
| ATRO Part Number | PL1146 |
| Industry Cross Ref | 321-223U / 321-223 / 95039 |
| UPC Code | 751354030860 |
| Material | Heavy-Duty Polyurethane |
| Design Feature | Straddle Mount / Does NOT Rotate |
| Bolt Hole Center-to-Center (C-C) | 4-3/8" |
| Outside Diameter (OD Ref) | 1.91" |
| Bolt Hole Size | 11/16" (Fits 5/8" Bolt) |
| Recommended Install Tool | ATRO PT00-52000 |
| Country of Manufacture | United States (USA) |
| Category | Suspension / Torque Rod Components |
| Quantity Per Vehicle | 2 per Torque Rod |
| Shipping Weight | 2.025 lbs |
This premium polyurethane straddle-mount bushing is engineered to fit the following heavy-duty suspension configurations:
Freightliner: FH36-40 (3" Spring), Four Spring Suspension, and FAS II Airliner setups.
Hendrickson: E4 340-400, HFS 360-460, HAS 360-460, HA 180-460 Series, and AL-40 suspensions.
This premium polyurethane component serves as a high-performance cross-reference or interchange for the following OEM and aftermarket part numbers:
Gaff: GAFF13521 (Exact Direct Cross Match)
Hendrickson: 47691-000L, 47691000E4, 47691, 47691000
Dayton Parts: 321-223U, 321-223, 95039 (Near Crosses)
Freightliner: A16-119448, HDR 47691 000L
Mack: 4000-47691000L, 85107110, 47691
International/Navistar: H47691000L, HUD47691000L, HD47691000L
Autocar: 47691000L-HR, 47691-000L
Automann: TRB6185, TRB6185UB
Dyco: DT1101, D405, DT1600
Euclid: E-5275
Flagg: HS44
BATCO: 14489
Application Tip: This item is sold individually. A standard layout requires 2 bushings per torque rod to complete a full service refresh. For a clean, damage-free press installation into your torque rod eyelet, it is highly recommended to use the official ATRO installation tool part number PT00-52000. Verify your bolt spacing parameters before ordering.
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