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

4G0412131,8J0511353F,4F0512131C,8K0412131F,3C0412303C5N0511359B,2K0511153B,2Q0511351B,3C0511359A,5Q0511357P,5Q0511357M

BMW/BENZ/Opel/Volvo/Porsche/Citroen

31336776390,31340308,31336771892,31336855440,0424764,5033.26, 31336776389, 33526776399, 33526776557, 31336770529, A2043230044

Honda/Toyoda/Lexus/Mazda/ Mitsubishi

20371-FG000,51722-SMG-E04,48331-42030,48331-21030,MR418018,MR961000,

D651-34-111,BR5G-34-111A,BBM234111,20321-AG010

Chevrolet/Fiat/Jeep/Chrysler/Dodge

23968094,24519397,T11-2901027,T11-2911033,4013004400,2905104AKZ16A,2915107XKY00A,2905106XSZ08A,10094336,10094348