INTRODUCTION

b500
Schatz manufactures a broad line of aircraft ball bearings used in aircraft control, aircraft accessory, and aircraft gearbox applications. Many of our aircraft bearings are manufactured and approved to the applicable SAE and U.S. Government military standards, controlled by AS7949 (formerly MIL-B-7949). Our aircraft bearings are also approved to many OEM specifications. The following is a list of Schatz series and the corresponding MS series designation.

This table is a list of the Schatz approvals to the AS7949 series.

AS7949 Series Schatz Series Description
AS21428 MB500DD Extra Light Torque Tube, Precision
AS21443 Pulley Pulley Type
AS27640 KP Heavy Duty
AS27641 KP-A Intermediate Duty
AS27643 DSP Heavy Duty, Self-Aligning
AS27644 DPP Extra Heavy Duty, Double Row
AS27645 KSP Self-Aligning
AS27646 B500DD Extra Light Torque Tube
AS27647 DW, GDW Heavy Duty, Extra Wide, Double Row
AS27648 KP-BS Extra Light Duty, Torque Tube, Self-Aligning

 

Grease specification

Bearings with a suffix -H are packed with grease that is approved to MIL-PRF-81322. Bearings with a -L are packed with grease that is approved to MIL-PRF-23827. Additionally, many other lubricants are available. Please see the Technical Info section for an additional listing of the available lubricants.

Plating

The majority of aircraft bearing series are cadmium plated per QQ-P-416E.  Check the specification of each series for details.  For series that are plated, all exposed surfaces of the inner and outer ring bearing components are plated with the exception of the inner ring bore.
Cadmium plating is very effective at preventing corrosion, including galvanic corrosion.  Alternatives to cadmium plating such as zinc nickel plating (per ASM2417) are also available.

Bearing modifications

Many of the Schatz Aircraft Control series can be manufactured with modified designs to suit
application requirements. Examples of these modifications follow:

Corrosion-resistant materials
The aircraft ball bearings listed in this website are made using AISI 52100 steel. Schatz manufactures many of these bearing series in AISI 440C corrosion resistant stainless steel as well.

Additionally, many of these series can be manufactured utilizing Schatz specification
EMS138 which utilizes a high corrosion resistant and high fatigue resistant steel.

Learn more about Schatz Bearing material options.

Higher precision level
Many of these series are offered in compliance to higher precision levels.  Higher precision versions of these series use an “M” prefix in the part number.  For example, the precision version of KP8A is MKP8A.

Low starting torque
Schatz can modify the seal, grease, separator, and ball complement on many of the bearings to offer a lower starting torque than the standard series offers.

Angular contact bearings and duplex sets
Schatz can manufacture some of the series in angular contact versions that can be mounted as single bearings or in pairs as a duplex set for increased axial capacity and rigidity.

Refer to the Technical Info section for more details.

 

Other Applications

These series of aircraft bearings are also suitable for other applications with:

  1. Oscillatory or slow rotational speeds
  2. High loads
  3. Corrosive environments or where galvanic corrosion is a concern