Modul Drum Brake Axle Type B (ET120)

The square spring drum axle with outer Saj (Type B) is one of the powerful and high-quality products of RST Axles, designed for trailers and heavy-duty trucks. With a load capacity of 9,000 kilograms and a drum brake system with a 420 mm diameter, this axle ensures a high level of safety and reliability under harsh working conditions. The square design combined with the outer Saj increases the axle’s durability and strength, contributing to better performance on long-distance routes and under heavy loads.

In terms of technical specifications, this axle is available under product codes 81500120002 and 81500120013. Its BM distance is 2040 and 2090 mm, and the kingpin distance (SP) is 1300 mm. It features a 10-bolt wheel pattern (M22×1.5), and the recommended tire size is 385/65 R 22.5, which is widely used in the heavy transport industry.

محور کاسه ای فنر چهار گوش ساج بیرون طرح B کد 258

Axle Technical Data Table

Product code Axle Load Brake system GM BM FM SP OH/K Tyres Recommended
81500120002 9000kg Drum Brake Ø420 470 1240 1300 2040 280/335
10Bolts M22 x 1.5		 385/65R 22.5
81500120013 525 2090

Suspension System Specifications

E C F D G Empty without air X(mm) Loaded without air X(mm) Air Spring Bracket(mm) ST FH
255 130 35 83 87 285 270 - 268 365
315 300 50 395

Axle Technical Data Table

Product code
81500120002
81500120013
Axle Load
9000kg
-
Brake system
Drum Brake Ø420
-
GM
470
525
BM
1240
-
FM
1300
-
SP
2040
2090
OH/K
280/335 10 Bolts M22 x 1.5
-
Tyres Recommended
385/65 R 22.5
-

Suspension System Specifications

E
255
255
C
130
130
F
35
35
D
83
83
D
87
87
Empty without air X
285
315
Loaded without air X
270
300
Air Spring Bracket
-
50
ST
268
268
FH
365
395
محور کاسه ای فنری چهارگوش ساج بیرون طرح b

The suspension system of this axle is designed to maintain complete balance and stability in both unloaded and loaded conditions. Precise adjustments for the spring bracket, X distance, and ST and FH dimensions enable an even distribution of forces and prevent excessive stress on the chassis components.

The main advantages of the square spring drum axle with outer Saj (Type B) include the high durability of the drum brake system, strong resistance to harsh road conditions, easy maintenance, and compatibility with trailers and heavy-duty trucks. These features make it an ideal choice for transportation companies and trailer manufacturers seeking a high-quality, safe, and high-performance product.