Sample Customer Order

Shimco, which is known for its ability to custom manufacture quality shims, recently had the opportunity to produce a mating part in the form of a bearing retainer intended for use in a gearbox assembly. To achieve maximum efficiency, we designed and manufactured the work-holding fixture for the milling operation. We also handled the CNC milling, from the mill profile to the drilling, boring, mill ears and mill keyway as well as the heat treatment and marking.

The parts were 0.740” long with an outside diameter of 3.370” and manufactured in 4340 steel with a surface finish of 63RMS. In addition, we dipped the finished parts in rust-preventing oil. We also had magnetic particle inspection performed and dimensional inspection done on-site to ensure it met our aerospace client’s specifications. Working from customer supplied-prints and a 2D CAD drawing, we produced 300 bearing retainers in nine weeks.

For more information on this project, please see the chart below or contact us directly for more information.

Highlights of Precision CNC Milled 4340 Steel Bearing Retainer Project

Product Description This bearing retainer is used within a gearbox assembly.
Capabilities Applied/Processes Primary:
Custom Fixtures
  • Design & Manufacture Work Holding Fixture for Milling Operations
CNC Milling
  • Mill Profile
  • Drilling
  • Boring
  • Mill Ears
  • Mill Keyway
Heat Treatment
  • Quench & Temper
  • Rc 93-98
  • Engraved with Part Number
Equipment Used to Manufacture Part Bar saw
CNC Horizontal Lathe
Overall Part Dimensions Length: 0.740”
O.D.: Ø3.370”
Tightest Tolerances +0.000”/-0.010”
True Position of 0.005”
Circular Runout of 0.005”
Parallelism of 0.001”
Material Used 4340 Steel
Max Surface Finish 63RMS
Material Finish Parts Dipped in Rust Preventing Oil Per MIL-L-6085 or MIL-C-16173C Grade 3
In process testing/inspection performed Magnetic Particle Inspection Dimensional Inspection
Industry for Use Aerospace
Volume 300
Delivery/Turnaround Time 9 weeks
Delivery Location Michigan
Standards Met Customer supplied print, 2D CAD Drawing
Product Name Bearing Retainer
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