Centre Flange – Spicer 2040 Series (MSL Type), Serrated + 63 mm Oil Seal
📌 Product Overview
This component is a centre flange / centre coupling used in Spicer 2040 series commercial driveshafts. It connects sections of the driveshaft or mates the driveshaft to a companion flange/drive unit, transmitting torque while accommodating angular movement and driveline alignment. The serrated face (cross-serration per ISO standards) provides positive mechanical grip to the mating flange or yoke, helping ensure smooth torque transfer and vibration resistance.
⚙️ Key Specifications
Series: Spicer 2040 – part of the Compact™ commercial driveshaft series. This series is rated for approximately 14 kNm functional torque and uses standardized flange and serration types.
Type: MSL (Mid-Slip / Centre Splined) Type – a centre section coupling variant with slip or mid-spline capability suitable for longer shafts or those with centre bearings.
Connection Style: Serrated / Cross-serrated (XS) per ISO serration standards — provides enhanced torque transmission and reduced backlash.
Height / Flange Thickness: ≈ 80 mm – overall height of the flange component (for axial and mechanical engagement).
Oil Seal Size: 63 mm seal bore – refers to the inner diameter of the oil seal installed with the flange assembly to retain lubrication inside the driveline and prevent external contamination.
Material: High-strength forged/machined steel alloy typical for heavy-duty drivetrain couplings.
🛠️ Design & Functional Features
✔ Serrated (Cross-Serrated) Surface
The serrated pattern on the flange face interlocks with the mating component — improving mechanical grip and distributing load over multiple teeth. This reduces fretting and micro-slip under heavy torque and vibration.
✔ Integrated Oil Seal (63 mm)
A dedicated 63 mm oil seal installed in or with the flange prevents lubricant leakage and keeps dust, grit and moisture out of internal driveline bearings and joints.
Proper sealing extends service life and improves reliability in demanding truck applications.
✔ Spicer 2040 Series Compatibility
Fits with other 2040 series components (flange yokes, companion flanges, driveshaft tubes) with standardized interfaces and bolt/spline patterns.
The Spicer Compact™ series often uses ISO-standard cross serrations making it easier to match flanges and yokes from compatible manufacturers.
🚛 Typical Applications
Commercial vehicle driveshaft centre coupling / mid-shaft connection — commonly used on trucks and buses where a long shaft needs a centre joint or mid-support flange.
Connects sections of a centre-bearing driveshaft or links the driveshaft to transmission/differential companion flanges.