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RB Tool & Manufacturing Company

Steel Cylinder Block

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RB Tool & Manufacturing Company has a proven reputation for delivering high quality components that meet the exacting demands of the aerospace industry. We are adept at working with a variety of materials, and have modern, multi-axis equipment that enables us to efficiently machine complex geometries from a single setup.

The cylinder block pictured here was designed for use in a hydraulic pump application. It was fabricated from AISI E 52100 steel per MIL-S-7420 specifications, which we used to rough turn the blanks. We utilize our horizontal 5-axis mill capabilites to create the holes and multiple cross-hole patterns. Parts were then hard turned and honed to dimensions of 3.374" in diameter, and 2.788" in length. These advanced CNC machining processes enabled us to meet the demanding .0000"/.0005" tolerance requirements, and leave a 13 RMS surface finish.

After deburring we heat treated the component to give it the corrosion resistance, high hardness, toughness, and strength to resist wear under rolling contact. CMM inspections ensured dimensional integrity, while a fluorescent penetrant inspection assured there were no surface defects that would compromise part performance.

Our in-depth knowledge of the aerospace industry and flexible, versatile processes enabled us to complete this job in a short 4 week turnaround. We continue to manufacture the part in quantities of 200-500/year. To learn more about this project or our expert aerospace machining capabilities, Contact us today.

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Highlights of CNC Machining this Steel Cylinder Block

Product Description
Hydraulic Pumps
CNC Machining Capabilities Applied/Processes
CNC Turning
  • Rough Turn Blank
  • Hard Turn
CNC Milling
Heat Treating
Equipment Used to Manufacture Part
Vertical Mill
CNC Lathe
Overall Part Dimensions
Length: 2.788"
Diameter: Ø 3.3745"
Tightest Tolerances
Ø 0.000" / Ø 0.0005"
Material Used
AISI E 52100 Steel per MIL-S-7420
Material Finish
13 RMS Surface Finish
In process testing/inspection performed
Fluorescent Penetrant Inspection (FPI)
Dimensional Inspection, Visual Inspection
Industry for Use
200 - 500 pcs/year
Delivery/Turnaround Time
4 - 6 Weeks
Delivery Location
FOB Origin
Standards Met
ISO 9001:2008
Customer Specifications, 2D CAD Drawing
Product Name
Cylinder Block