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AAR Standard Forged Railway Axle Journal Box of Bearing

AAR Standard Forged Railway Axle Journal Box of Bearing

Product No.：2024125204348
Material：high-quality carbon steel
Standard：AAR
mould charge：yes
Production time：60
weight：38
Package：Wood Box
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Forged Railway Axle Box Manufacturer | High-Strength AAR Standard Parts

Our AAR Standard Forged Railway Axle Journal Boxes are precision-engineered bearing housings designed for the wheelset assemblies of freight wagons, locomotives, and passenger coaches. Manufactured in strict compliance with AAR Specification M-101 (Heat-Treated Carbon Steel Axles), these journal boxes provide robust support for roller bearings, efficiently transfer vertical car body loads to the axles, and ensure reliable lubrication and sealing for extended bearing service life.

Key design features:

Premium forged steel construction – Manufactured from high-strength AAR M-101 Grade F carbon steel, ensuring superior strength, toughness, and fatigue resistance
Heat-treated for durability – Available in Grade F (double normalized and tempered), Grade G (quenched and tempered), and Grade H (normalized, quenched and tempered) configurations to meet diverse operational requirements
Precision machining – Axle journal bores, wheel seats, and dust collar seats are precision turned to AAR dimensional tolerances
Roller bearing compatible – Designed to accommodate standard AAR roller bearing assemblies (cylindrical and tapered roller types)
Full interchangeability – Meets AAR dimensional standards for seamless replacement across North American rail networks

Available in standard AAR classes:

Class	Journal Size (inch)	Typical Axle Load	Primary Application
Class D	5½″ × 10″	16.4 t	Light-duty freight cars
Class E	6″ × 11″	20.5 t	Standard freight cars
Class F	6½″ × 12″	24.5 t	Heavy-duty freight cars
Class G	7″ × 12″	35.7 t	Heavy-haul / high-capacity freight
Class K	6½″ × 9″	32.4 t	LWLH bogies / special applications

Every journal box undergoes rigorous quality control including dimensional inspection, ultrasonic testing, magnetic particle inspection, and hardness verification per AAR M-101 requirements. Our manufacturing facility is certified under AAR M-1003 and
ISO 9001.

Technical Specifications Table:

Parameter	Class D	Class E	Class F	Class G	Class K
Journal Size (inch)	5½″ × 10″	6″ × 11″	6½″ × 12″	7″ × 12″	6½″ × 9″
Journal Diameter (inch)	5½″	6″	6½″	7″	6½″
Journal Length (inch)	10″	11″	12″	12″	9″
Wheel Seat Diameter (inch)	7 9/16″	8 1/4″	8 3/4″	9 1/2″	8 3/4″
Dust Collar Diameter (inch)	5 7/8″	5 7/16″	7 3/8″	8″	7 3/8″
Axle Body Diameter (inch)	7 5/8″	7 5/8″	7 5/8″	7 5/8″	7 5/8″
Overall Length (inch)	86 1/8″	88″	89 5/8″	89 1/4″	87.156″

Component Breakdown Table:

Component	Function
Journal Box Housing	Main forged steel body; houses the roller bearing assembly
Axle Journal Bore	Precision-machined surface that seats onto the axle journal
Bearing Seat	Internal machined surface that accommodates the roller bearing outer ring
Dust Collar Seat	Seating surface for dust collar; prevents contaminants from entering bearing area
Wheel Seat	Machined surface where the wheel is press-fitted onto the axle
Lubrication Port	Opening for grease or oil lubrication injection
Sealing Surface	Machined surface for bearing seal installation
Identification Marking	AAR-required stamps indicating grade, class, and manufacturer

Typical Applications Table

Application Recommended Class Axle Load Rolling Stock Type

Light-duty freight cars Class D 16.4 t General freight wagons

Standard freight cars Class E 20.5 t Bulk commodity, intermodal

Heavy-duty freight cars Class F 24.5 t Heavy-haul freight wagons

High-capacity heavy-haul Class G 35.7 t Unit trains, mineral transport

LWLH bogie applications Class K 32.4 t Light-weight low-height bogies

Locomotives Class G / H 30–40 t Diesel-electric and electric locomotives

Passenger coaches Class E / F 20–25 t Conventional and high-speed passenger trains

Application	Recommended Class	Axle Load	Rolling Stock Type
Light-duty freight cars	Class D	16.4 t	General freight wagons
Standard freight cars	Class E	20.5 t	Bulk commodity, intermodal
Heavy-duty freight cars	Class F	24.5 t	Heavy-haul freight wagons
High-capacity heavy-haul	Class G	35.7 t	Unit trains, mineral transport
LWLH bogie applications	Class K	32.4 t	Light-weight low-height bogies
Locomotives	Class G / H	30–40 t	Diesel-electric and electric locomotives
Passenger coaches	Class E / F	20–25 t	Conventional and high-speed passenger trains