Offered for sale is an original New Old Stock Hyatt split cylindrical roller retainer assembly, preserved in military packaging since 1954.
This is not a complete bearing with races — this is the split roller cage assembly, designed to run between hardened inner and outer races in large industrial machine tools.
Stamped and packaged under:
Government Stock No: 3400-539007
Manufacturer: Hyatt
Part No: 52848
Military Spec Packaging: MIL-B-131B Class 1
Preserved: January 1954
Re-inspection: November 1959
Federal Supply Class 3400 indicates use in metalworking machinery (lathes, boring mills, milling machines, etc.).
Approximate Dimensions: Inside Diameter: ~6.5" Outside Diameter: ~8.5" Width: ~0.41" Split two-piece design Cylindrical rollers in brass cage (Please verify dimensions for your application.) Condition: True NOS (New Old Stock) Original military cosmoline preservative present No visible corrosion or pitting Stored in original MIL barrier wrap Never installed Cosmoline has protected the rollers exceptionally well.
Application: Likely used in: Large engine lathe headstock assemblies Horizontal boring mill spindle supports Rotary tables Gear cutting machinery 1940s–1960s heavy industrial equipment
This is a service replacement roller cage assembly, not a standard catalog bearing.
