INTRODUCTION
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:
- Oscillatory or slow rotational speeds
- High loads
- Corrosive environments or where galvanic corrosion is a concern
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