KOCKS-Type Rod Mill Stand Bearing Replacement Case
A custom bearing arrangement for a KOCKS-type rod mill stand housing, supplied for maintenance replacement with technical review, improved material selection, controlled surface finish and long-term repeat supply.
Custom Bearing Set for Mill Stand Housing
Double row cylindrical roller bearings and a matched angular contact ball bearing set with spacer.
Custom Bearing Set for KOCKS-Type Rod Mill Stand Housing
TEDIN supplied a complete replacement bearing set for rolling mill bearings used in rod mill stand housing maintenance. The set included two double row cylindrical roller bearings and one matched angular contact ball bearing set with spacer, and has been repeatedly supplied for the customer’s maintenance program over the past 7–8 years.
Application Background
The bearing set was used for a KOCKS-type rod mill stand housing, where scheduled maintenance required a compatible replacement arrangement for the existing installation structure.
Supplied Bearing Set
The supply scope included two double row cylindrical roller bearings and one matched angular contact ball bearing set with spacer for radial support and axial positioning.
Long-Term Supply Record
TEDIN has supported repeat supply for this application for 7–8 years, with verified operating records reaching approximately 7,500 hours.
Early Contact Fatigue Observed at 2,700 Operating Hours
For the customer’s rod mill maintenance team, bearing life stability was a key concern because unexpected replacement could directly affect mill availability and maintenance planning.
The replacement project required more than matching bearing dimensions. TEDIN reviewed the bearing arrangement as a complete set, including contact surface quality, internal fit and repeatable supply for future maintenance cycles.
Customer-provided inspection photos: reference images used for the replacement bearing review.
Inspection Summary
Service Time
2,700 hours Previous operating record before replacement review.
Observed Area
Roller surface and raceway contact surface.
Main Concern
Early contact fatigue marks appeared before the expected maintenance target.
Replacement Focus
Complete bearing arrangement, material control, raceway finish and repeatable supply.
From Inspection Findings to Corrective Measures
Based on the customer’s inspection photos and the previous 2,700-hour operating record, TEDIN reviewed the likely factors behind the early contact fatigue and defined corresponding controls for the replacement bearing set.
Contact Surface Fatigue
Problem Review
Fatigue marks appeared on both roller and raceway contact surfaces, indicating that the replacement needed to focus on contact stability, not only bearing dimensions.
TEDIN Measure
TEDIN reviewed the load-bearing contact areas and treated the rolling contact condition as a key point for the replacement bearing set.
Bearing Material Quality
Problem Review
The rod mill stand works under repeated rolling contact stress, where bearing steel cleanliness and material consistency directly affect fatigue resistance.
TEDIN Measure
TEDIN used high-purity bearing steel to improve material cleanliness and strengthen the fatigue resistance of the bearing components.
Roller Surface Profile
Problem Review
Under heavy rolling mill loads, local edge stress or uneven contact pressure on the roller surface may accelerate fatigue on the rolling contact path.
TEDIN Measure
For the double row cylindrical roller bearings, TEDIN optimized the roller surface profile with a logarithmic curve to improve contact stress distribution and extend bearing service life.
Complete Set Matching
Problem Review
Replacing bearings individually may create uncertainty in fit, internal matching and load distribution inside the stand housing.
TEDIN Measure
TEDIN supplied the bearings as a matched replacement set for the KOCKS-type rod mill stand housing to reduce installation risk.
Replacement Bearings Prepared for the KOCKS Stand Layout
TEDIN supplied double row cylindrical roller bearings for the radial load positions in the customer’s KOCKS stand. The replacement bearings were prepared according to the existing housing arrangement and confirmed with the required precision and clearance specification.
KOCKS stand layout: double row cylindrical roller bearings are positioned at the radial load support locations.
Supply Summary
- Application KOCKS Stand
- Bearing Type Double row cylindrical roller bearing
- Precision P5
- Clearance C3
- Size Range ID 108.9–126.3 / OD 170–200 / H 90–130 mm
Supplied Bearing Products
Product photos show the supplied bearing type, roller arrangement and finished condition before delivery.
More Than a Dimensional Match
In this case, TEDIN did not treat the rolling mill bearing application as a simple size replacement. The earlier fatigue record, KOCKS stand arrangement and replacement details were reviewed together before preparing the bearing set.
Failure record
Operating hours, failed bearing photos and damage location helped define what needed to be checked before replacement.
Stand arrangement
The bearing set had to match the existing housing, radial load position and mounting condition of the KOCKS stand.
Replacement details
Precision grade, internal clearance, roller profile and material condition were considered as part of the replacement set.
Need a Replacement Bearing for a Rolling Mill Stand?
If your rolling mill stand is experiencing early bearing fatigue, short service life or repeated bearing replacement, send us the bearing information for review. TEDIN can check the application condition before preparing a suitable replacement proposal.
Information to Send
- 01 Bearing drawing or current bearing model
- 02 Failed bearing photos and damage location
- 03 Operating hours before replacement or failure
- 04 Stand type, mounting position and working condition
- 05 Lubrication condition and any previous replacement record