Jounce Bumper (also known as Bump Stop, Bump Rubber, Rubber Buffer or Strut Bumper) is an elastic component typically made of high-elasticity polyurethane (MDI/NDI), installed on the piston rod of a shock absorber to provide progressive auxiliary stiffness at the end of the suspension compression stroke.

Functions

· Provides auxiliary stiffness at end of compression stroke, limits travel, prevents bottoming out.

· Absorbs impact energy, reduces noise and load from metal-to-metal contact.

· Improves ride comfort under large impacts.

Temperature Range -40°C to +90°C (meets standard passenger car requirements; material can be adjusted for special conditions).

Service Life Design life ≥80,000 km or 2 years under normal use – no cracking, excessive permanent deformation, or stiffness loss.

Warranty & Quality

· Quality Standard: IATF 16949. Inspects static stiffness curve, compression set, hardness, appearance.

· Warranty: Typically 1–2 years or 50,000–100,000 km.

OE/OEM Numbers:

Volkswagen/Audi/Skoda/Seat

8D0412131E,8D0512131,5Q0412303,1S0412303,1S0412303A,5Q0511357F,7L6412303,7L0512131B,6Q0512131B,6X0512131A, 5Q0511357N

BMW/BENZ/Opel/Volvo/Porsche/Citroen

0344418,0344412,0344409,33531135624,33531136395,1683230844,90112571 ,93310506,0344402,770044,33531138109,2013232044,31331124449

Honda/Toyoda/Lexus/Mazda/ Mitsubishi

51722-SWE-T01, 48331-12210, 48341-47010, 51722-SS0-004, 52722-SDA-A01, 52722-SM4-013, 51722-TF0-014, GJ6A-34-111C,GJ6A-34-111C,51722-SNA-904,51722-SNA-003

Chevrolet/Fiat/Jeep/Chrysler/Dodge:

96549925,96403109, 93BB5K570AC, 84153144, 96859128, 523065, 51941991, 1780533, 51939952, 68063781AE, 1307842