Aerospace Bearings

Airframe Control

Airframe Control Bearings are the broadest category of products that NPB offers. This Ball Bearing product is really the go-to part for oscillation in the bearing world. Due to their versatility and variety they are used for inserts for larger assemblies & pulleys, slight mis-alignment, or any application requiring slow rotation or oscillating motion. They are utilized across many non-aircraft industries due to their precision, radial and axial positioning, and excellence in oscillatory motion.

The most common industry standard for the airframe control bearings is the Society of Automotive Engineers (SAE) AS7949. This was formerly Mil-B-7949.

Some examples of airframe control bearing basic part numbers are(:)
MS27640 ..... KP_ .................. Heavy Duty Ball Bearing
MS27641 .... KP_A ................ Intermediate Duty Ball Bearing
MS27645 .... KSP_, KSP_A ... Light & Heavy Duty Self Aligning Ball Bearing
MS27646 ..... B5__DD ............ Light Duty Torque Tube
MS27644 ..... DPP_ ................ Double Row Ball Bearing

Most of this product is produced in SAE 52100 chrome steel with cadmium or zinc plating with MILPRF- 81322 grease. Alternatively, 440C stainless steel and Mil-Prf-23827 grease is also available for this product.

For more information on Airframe control Bearings and your specific needs please contact us.

Airframe Control Bearing Interchange

Ball Bearings - Governing Spec AS7949
Part Number
RFQ per item
New Hampshire
Ball Bearing
RBC Aircraft Schatz
MS27640-3A KP3L KP3L FS464 KP3L-H
MS27640-3 KP3 KP3 FS464 KP3-H
MS27640-4 KP4 KP4 FS464 KP4-H
MS27640-5 KP5 KP5 FS464 KP5-H
MS27640-6 KP6 KP6 FS464 KP6-H
MS27640-8 KP8 KP8 FS464 KP8-H
MS27640-10 KP10 KP10 FS464 KP10-H
Part Number
RFQ per item
New Hampshire
Ball Bearing
RBC Aircraft Schatz
  KP3AL KP3AL FS464  
MS27641-3 KP3A KP3A FS464 KP3A-H
MS27641-4 KP4A KP4A FS464 KP4A-H
MS27641-5 KP5A KP5A FS464 KP5A-H
MS27641-6 KP6A KP6A FS464 KP6A-H
MS27641-8 KP8A KP8A FS464 KP8A-H
MS27641-10 KP10A KP10A FS464 KP10A-H
MS27641-12 KP12A KP12A FS464 KP12A-H
MS27641-16 KP16A KP16A FS464 KP16A-H
MS27641-20 KP20A KP20A FS464 KP20A-H
Part Number
RFQ per item
New Hampshire
Ball Bearing
RBC Aircraft Schatz
MS27645-3A KSP3L KSP3L FS464 KSP3L-H
MS27645-4A KSP4A KSP4A FS464 KSP4A-H
MS27645-5A KSP5A KSP5A FS464 KSP5A-H
MS27645-6A KSP6A KSP6A FS464 KSP6A-H
MS27645-3 KSP3 KSP3 FS464 KSP3-H
MS27645-4 KSP4 KSP4 FS464 KSP4-H
MS27645-5 KSP5 KSP5 FS464 KSP5-H
MS27645-6 KSP6 KSP6 FS464 KSP6-H
MS27645-8 KSP8 KSP8 FS464 KSP8-H
MS27645-10 KSP10 KSP10 FS464 KSP10-H
Torque Tubes - Governing Spec AS7949
Part Number
RFQ per item
New Hampshire
Ball Bearing
RBC Aircraft Schatz
B538 B538 FS464 B538
B539 B539 FS464 B539
B540 B540 FS464 B540
B541 B541 FS464 B541
B542 B542 FS464 B542
B543 B543 FS464 B543
B544 B544 FS464 B544
B545 B545 FS464 B545
B546 B546 FS464 B546
Part Number
RFQ per item
New Hampshire
Ball Bearing
RBC Aircraft Schatz
MS27646-38 B538DD B538DD FS464 B538DD-H
MS27646-39 B539DD B539DD FS464 B539DD-H
MS27646-40 B540DD B540DD FS464 B540DD-H
MS27646-41 B541DD B541DD FS464 B541DD-H
MS27646-42 B542DD B542DD FS464 B542DD-H
MS27646-43 B543DD B543DD FS464 B543DD-H
MS27646-44 B544DD B544DD FS464 B544DD-H
MS27646-45 B545DD B545DD FS464 B545DD-H
MS27646-46 B546DD B546DD FS464 B546DD-H
Part Number
RFQ per item
New Hampshire
Ball Bearing
RBC Aircraft Schatz
MS21428-38 MB538DD MB538DD FS464 MB538DD-H
MS21428-39 MB539DD MB539DD FS464 MB539DD-H
MS21428-40 MB540DD MB540DD FS464 MB540DD-H
MS21428-41 MB541DD MB541DD FS464 MB541DD-H
MS21428-42 MB542DD MB542DD FS464 MB542DD-H
MS21428-43 MB543DD MB543DD FS464 MB543DD-H
MS21428-44 MB544DD MB544DD FS464 MB544DD-H
MS21428-45 MB545DD MB545DD FS464 MB545DD-H
MS21428-46 MB546DD MB546DD FS464 MB546DD-H