Rotary Shaft Seal CORTECO® 12011129 NBR BASLX7 Oil Seal 28X40X7

Technical specifications and construction

The CORTECO 12011129 NBR BASL oil seal is precision-engineered to serve as a high-performance rotary shaft seal in demanding automotive and industrial applications. Its dimensions are 28 mm inner diameter, 40 mm outer diameter, and 7 mm width — optimized for compact housings while maintaining robust sealing. The “BASL” design refers to a single-lip oil seal equipped with an integrated dust lip, enhancing protection against contaminants and prolonging the service life of the shaft sealing ring.
Constructed from high-quality NBR (nitrile butadiene rubber), this technical seal offers excellent resistance to oils and grease, and robust performance in standard temperature and dynamic conditions typical of transmissions and drive systems. Its metal-reinforced outer case ensures stable installation and tight fitment.

Applications & benefits for B2B customers

This oil seal is widely used in manual transmissions, gearboxes, steering gears and fuel injector systems for brands such as CITROËN, DUCATI, MERCEDES-BENZ, OPEL, PEUGEOT, PIAGGIO and RENAULT TRUCKS. Typical user search queries include “shaft seal 28x40x7 NBR”, “CORTECO 12011129 BASL”, “oil seal 28x40x7 transmission”.
For procurement and maintenance departments in industrial and automotive sectors, this product delivers key advantages:

• High durability due to premium NBR material and dust-lip design.

• Strong resistance to oils and grease, reducing leakage and maintenance costs.

• Simplified logistics thanks to standardized size (28x40x7) and trusted OEM compatibility.

• Reliable in industrial applications and engine/gearbox systems where downtime must be minimized.

Installation, operation & technical guidance

Ensure the housing bore and shaft surface are clean, burr-free, and correctly dimensioned prior to installation. The outer metal case of the seal must be pressed evenly into the bore to avoid deformation of the sealing lip. Apply a thin film of compatible lubricant to the shaft surface to minimize friction during start-up.
While the NBR compound performs reliably in typical oil/seal conditions, for extremely high temperatures, aggressive fluids or heavy-duty industrial environments consider exploring elastomers like FKM. Regular inspections of lubricant quality and seal condition will help maintain peak performance and extend service life.

FAQ - Frequently Asked Questions

Q1: What distinguishes this single-lip oil seal from a double-lip version?
A1: A single-lip oil seal features one primary sealing lip (as in BASL design) and is suitable for applications with moderate contamination and standard pressure. A double-lip seal adds a secondary lip or spring, offering enhanced protection under heavy contamination or high pressure.

Q2: Why is NBR chosen as the material for this seal?
A2: NBR (nitrile rubber) offers excellent resistance to oils and grease, good wear properties and reliable performance in typical automotive and industrial environments, making it ideal for a transmission or engine shaft seal.

Q3: How to ensure correct dimension fit for this seal?
A3: Verify inner diameter (28 mm) matches the shaft, outer diameter (40 mm) fits the housing bore, and width (7 mm) suits the available axial space. Tolerances of the bore, shaft and fitment must all meet design criteria.

Q4: What are the typical applications of this shaft sealing ring?
A4: It is designed for gearboxes, manual transmissions, steering systems and injector pumps within automotive and industrial installations requiring a reliable oil seal with integrated dust lip.

Q5: Is this product available for fast delivery?
A5: 📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
🚚 24h Delivery - fast order processing for industrial B2B clients.