ZF 634306328 – Screw‑In Dipstick O‑Ring Ø38 × 4 mm for Marine Transmissions

ID 1232593

$ 7.17

1-2 weeks delivery time

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ZF 634306328 – O‑Ring 38×4 mm is a precision sealing ring made of NBR (70 Shore A) for ZF marine transmissions. With a 38 mm inner diameter and 4 mm thickness, it resists oils, fuels, saltwater, and temperatures from –40 °C to +120 °C. Designed for up to 30 bar pressure, it ensures leak-free performance in harsh marine environments.

Description
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ZF 634306328 – Screw‑In Dipstick O‑Ring Ø38 × 4 mm for Marine Transmissions

The ZF 634306328 O‑Ring is a radial, circular cross‑section sealing component designed for secure and reliable sealing in threaded/screw‑in dipstick installations for ZF marine transmissions. Molded from durable Nitrile Butadiene Rubber (NBR) at 70 Shore A hardness, it ensures consistent sealing under vibration, fluid exposure, and large temperature swings typical in marine propulsion systems. This O‑ring prevents fluid leakage and blocks external contaminants from entering the transmission housing, preserving lubrication integrity and extending component lifespan.

Key Features:

Threaded/screw‑in dipstick fitment for marine transmissions
Material: NBR (Nitrile Butadiene Rubber), 70 Shore A hardness
Highly resistant to transmission oils, fuels, lubricants, moisture, and saltwater
Reduces leakage risk and prevents system contamination
Elastic, vibration‑resistant design for durable compression sealing
Direct service replacement for ZF dipstick sealing points
Supports both recreational and commercial vessel applications

Specifications:

Property	Value
Part Number	ZF 634306328
Material	Nitrile Butadiene Rubber (NBR)
Hardness	70 Shore A
Inner Diameter	38 mm
Outer Diameter	46 mm
Cross‑Section Thickness	4 mm
Operating Temperature Range	-40°C to +120°C
Max Operating Pressure	30 bar (435 psi)
Compression Set	< 25% @ 70°C for 22 hours
Elongation at Break	≥ 200% (ASTM D412)
Tensile Strength	≥ 10 MPa (ASTM D412)
Fluid Resistance	Transmission oil, fuels, mineral & synthetic lubricants
Environment Resistance	Saltwater, humidity, chemical & oil exposure
Color	Black
Service Type	Continuous marine duty, minimal maintenance

Compatibility & Application:

The ZF 634306328 O‑Ring is purposed for threaded/screw‑in dipstick sealing points in ZF marine transmissions used in yachts and commercial vessels, where leak prevention and contamination protection are critical for sustained low‑maintenance gearbox operation.

Benefits:

Leak‑proof dipstick sealing protecting internal transmission lubrication
Blocks contaminant ingress, preserving system cleanliness
Extends service life of surrounding transmission components
Effective in extreme temperature and pressure marine conditions
Quick, cost‑efficient and precise service replacement
Reduces overall maintenance costs and vessel downtime