4757NP21/4757 N P21 Contitech Truck Air Suspension A9423204321 Mercedes Benz Shock Absorbers

4757NP21/4757 N P21 Contitech Truck Air Suspension A9423204321 Mercedes Benz Shock Absorbers

Product Description

Truck air springs are key upgrade components for modern commercial vehicle suspension systems. They significantly improve ride comfort, protect cargo safety, extend chassis life, and optimize vehicle handling stability by providing superior cushioning, highly precise adjustment capabilities, and excellent load adaptability. Their intelligent, efficient, and durable features are increasingly becoming the core technology for improving truck transportation efficiency and user experience, and represent the future trend of commercial vehicle suspension systems continuing to develop toward intelligence and comfort.

Item Name: Truck Air Suspension Spring

Model Number: 1T4757

Brand: GUOMAT

Application: For Truck

Maximum Working Pressure: 7 BAR
Bellows Material: Natural Rubber
Piston/Base Design: Steel Piston
(Mounting Type): Top bolt mounting, bottom pressure plate mounting

GUOMAT No.: 1T4757

Contitech: 4757NP21 / 4757 NP21 / 4757 NP 21 / 4757 N P21

Airtech: 34757-21K

Airfren: 20.4757.1CM

DT: 4.80374

Peautomotive: 084.111-15A

Peautomotive: 084.111-75A

Templin: 04.010.6100.960

Mercedes Benz: A9423204321 

Mercedes Benz: A 9423204321

Mercedes Benz: A 942 320 4321

Mercedes Benz: A 942  320 43 21

Mercedes Benz: 9423204321

Mercedes Benz: 942 320 4321

Mercedes Benz: 942 320 43 21

Mercedes Benz: A9423200117

Mercedes Benz: A 9423200117

Mercedes Benz: A 942 320 0117

Mercedes Benz: A 942 320 01 17

Mercedes Benz: 9423200117

Mercedes Benz: 942 320 0117

Mercedes Benz: 942 320 01 17

Selection of Air Springs for Truck Suspensions

1. Determine core parameters
Load range: Select the load capacity of the spring according to the vehicle's unloaded and fully loaded weight (including axle load distribution), and reserve a safety margin of 10%-15%.

Stroke requirements: Ensure that the spring stroke matches (such as ±75mm, ±100mm) based on the minimum to maximum compression distance of the suspension design.

Installation space: Measure the available space (diameter, height) and select the appropriate spring type (such as sleeve, corrugated or membrane).

2. Spring type selection
Sleeve air spring: suitable for high loads and large strokes (such as heavy truck rear suspensions), good durability but large size.

Corrugated air spring: lightweight design, suitable for medium loads (such as trailer suspensions), low cost.

Membranous air spring: compact and flexible, commonly found in passenger cars or light trucks, but requires high installation accuracy.

3. Key performance considerations
Stiffness characteristics: nonlinear stiffness can be achieved by adjusting the number of airbags or adding air chambers to optimize the shock absorption effect.

Durability: high-strength rubber composite materials (such as EPDM + nylon cord) are selected, and attention should be paid to anti-aging and oil resistance.

Environmental adaptability: low-temperature elastic materials (such as silicone rubber) are required in cold areas, and dust cover design is required in dusty environments.

4. Verification and adaptation
Bench test: simulate dynamic loads (such as 5 million cycle tests) to verify fatigue life.

Real vehicle matching: check the interference with shock absorbers and guide mechanisms to ensure motion compatibility.

The Real Pictures of 1T4757 Air Spring