687.55 flange yoke with a 180 mm cross-serrated face for 2055-series 57×152 mm universal joints. Four-bolt arrangement, 150 mm PCD and 100 mm nominal flange-face-to-bearing-centreline dimension.
687.55 Flange Yoke – 180 mm Cross-Serrated, 4-Bolt | 2055 Series
Description
687.55 Flange Yoke Product Overview
The 687.55 flange yoke connects a 2055-series 57×152 mm universal joint to a matching serrated companion flange. This version uses a nominal 180 mm flange outside diameter, four mounting positions on a 150 mm pitch-circle diameter and a cross-serrated contact face.
The serrated interface is a torque-transmitting locating feature. It must be matched by tooth form and contact geometry as well as by flange diameter and bolt pattern. A plain 180 mm flange yoke is not an automatic substitute.
Cross-Serrated Flange Interface
Radial tooth groups on the flange face interlock with the mating flange and help resist relative movement under torque. Correct engagement depends on compatible serration pitch, tooth angle, radial position and face condition. Inspect the mating face for damaged or flattened teeth before installation.
Technical Specifications
| Product type | Cross-serrated flange yoke |
|---|---|
| Series | 687.55 / 2055 |
| Nominal U-joint size | 57×152 mm |
| Flange outside diameter | 180 mm |
| Mounting arrangement | 4-bolt |
| Pitch-circle diameter | 150 mm |
| Flange face to bearing centreline | 100 mm nominal |
| Face style | Cross-serrated / face-tooth |
| Construction | Forged steel with machined bores, mounting faces and serrations |
What Must Be Verified
When replacing a 687.55 flange yoke, confirm the bearing diameter and joint span, flange OD, bolt count, PCD, hole or thread form, pilot geometry, flange-face-to-bearing-centreline dimension and serration pattern. Matching only the 180 mm outside diameter can produce an incorrect connection.
The 687.55 and 2055 designations identify the universal-joint family. Different flange patterns and face geometries can exist within a series, so the old flange, drawing or mating companion flange remains the final approval reference.
Machining and Quality Checks
Each 687.55 flange yoke should be checked for bearing-bore alignment, flange-face runout, PCD position, mounting-hole condition and serration contact. The machined bearing seats and flange features must remain aligned with the forged yoke body to avoid joint preload or driveshaft runout.
Series References and Identification
Useful search descriptions include 687.55 flange yoke, 68755 serrated flange yoke, 2055 series flange yoke and 180 mm cross-serrated flange yoke. Reference wording varies by market. Treat all catalogue numbers as identification leads and verify the listed dimensions before ordering.
687.55 Series Matching Components
| Component | Primary identifier |
|---|---|
| Slip assembly | 57×152 mm joint, 120 mm sleeve |
| Weld yoke | For 120×6 mm tube |
| Cross-serrated flange yoke | 180 mm, 4-bolt, 150 mm PCD |
| Universal joint | 57×152 mm |
Ordering Checklist
When ordering a 687.55 flange yoke, provide the required quantity, flange OD, bolt count, PCD, mounting-hole specification, face-to-centre measurement and clear photographs of the serrated face. A photograph taken square to the flange face is especially useful for checking the tooth groups and hole arrangement.
Frequently Asked Questions
Is this 687.55 flange yoke the same as a smooth-face 180 mm flange yoke?
No. This version uses a cross-serrated contact face and requires a compatible mating flange.
Are all models in this product family four-bolt?
No. Flange diameter and hole patterns can vary within the wider product family. Verify the complete pattern.
Why is the 100 mm face-to-centre dimension important?
It affects the assembled driveshaft length and joint position. A flange with a different offset can change shaft geometry even when the bolt pattern matches.
Contact MR Driveline for 687.55 flange yoke dimensional review, drawing-based production and export quotation.
Additional information
| Brand | MR Driveline |
|---|---|
| Series | 687.55 / 2055 |
| U-Joint Size | 57×152 mm |
| Flange Outside Diameter | 180 mm |
| Mounting | 4-bolt, 150 mm PCD, cross-serrated |
