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

Guangzhou Guomat Air Spring Co., Ltd. is located in Guangzhou, about 15min’s drive from Baiyun Airport. Our mainly products are air spring, rubber bellows, air suspension spring, air suspension compressor and refitted suspension system. They are widely used in bus, truck, cabin, vehicles’ seat, luxurious car and industrial machine field.

GUOMAT Factory gate：

Established in 2008, Our company covers 20,000㎡ and is located in Taihe Town Baiyun District. With the rapid development of our company, we are equipped with modernized workshop and advanced rubber air springs equipments now. We are the first company who started air spring business and has become one of the largest air spring manufacturing bases in China.

In 2017, we launched a collaboration with High Tech of US customers to customize the products of our customers and the logo of our customers. Every year, there are about 10,000 orders. In continuous cooperation, the products meet the international inspection standard ISO/TS16949:2009, and the customers are very satisfied with the products produced. This is our high recognition from American customers and also gives us Great motivation.

In 2018, we started cooperation with German GmbH, mainly industrial air springs, which are suitable for industrial equipment. We have successfully developed and produced the natural air-seal of the skin to reach the 700mm flanged air spring, the customer's annual demand is a few hundred.

With the development of business and demand for customers, our company introduced business with TomLog Corporation in 2010, our strategic cooperative partner in Taiwan. Then we developed air compressor program and air spring related business, in 2015, America Goodyear Corporation met with the transfer of shares in the North American plant, our company was granted with sale agent for air springs in China, providing more choice for our customers. Our company adopts the most advanced domestic air spring processing equipment and international production technology. Combined with unique production process, our company strictly execute international standards for production and spare no efforts to create the world-class products. We will endeavor to make air spring widely used at home and abroad, and let more and more customers to enjoy the best damping effect.