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 LifeDesign 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

6U9412303,4B0512131N,6N0412303A,6Q0412301,1K0412303B,1K0511353P,3C0511359,3B7412377A,1H0412303B,1J0512131,96494604,377412131

BMW/BENZ/Opel/Volvo/Porsche/Citroen

31331140140,31360451,9140067,30635296,31336771352,31302290313,31331096298,33506757368,31336764086,1293230744,2463210206,2053211606

Honda/Toyoda/Lexus/Mazda/ Mitsubishi

52722-S9A-014,48341-32052,PW-861069,PW922931,48331-33032,48331-28050,48331-52100,48331-33030,51722-SWA-A02,KR11-28-111

Chevrolet/Fiat/Jeep/Chrysler/Dodge

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