Precision Machined Components for Fluid Power & Hydraulics
Resolute Precision Manufacturing is a direct-from-manufacturer source for precision CNC machined components used in fluid power systems, including hydraulic valves, spool valves, manifolds, cylinders, fittings, and hydraulic honing. Our Fluid Power CNC Machining Services use Swiss CNC machines to produce complex small-diameter valve components with the tight tolerances that fluid power performance requires. We also offer hydraulic cylinder bore honing as a value-added service. Direct pricing. 24-hour quote response. Request a QuoteWhy Fluid Power Components Demand Precision Machining
Hydraulic and pneumatic systems operate on pressure differentials, and leakage across spool-to-bore clearances, piston-to-cylinder interfaces, and threaded port connections can directly affect system efficiency and performance. A spool valve that is 0.002 inch undersized on its diameter can leak across the bore and reduce actuator performance. A cross-drilled port that is off-center by 0.005 inch can unbalance flow and create additional pressure drop.
Fluid power components require tolerances measured in ten-thousandths of an inch, including tight OD-to-bore clearances on precision spool valves, thread forms that seal under high pressure, and surface finishes that help ensure long service life without wear-induced leakage. Resolute Precision’s Swiss CNC machines and multi-axis lathes provide the capabilities required for this class of component.
Fluid Power CNC Machining Services
Resolute Precision provides Fluid Power CNC Machining Services for manufacturers requiring precision-turned and milled components for hydraulic and pneumatic systems. Our capabilities include Swiss CNC turning, multi-axis mill/turn machining, horizontal and vertical milling, cross-drilling, precision boring, threading, and hydraulic cylinder bore honing.
From prototypes and low-volume production to high-volume manufacturing, we machine components to customer drawings and specifications using materials commonly required for hydraulic and fluid power applications.
Honing for Hydraulic Cylinder Bores
Beyond machined components, Resolute Precision offers hydraulic cylinder bore honing, providing precision finishing of hydraulic cylinder and valve body bores to the diameter, roundness, and surface finish specifications required for reliable sealing and long seal life.
Our honing services cover bores from 0.157 inch to 10 inches in diameter in gray iron, ductile iron, steel, stainless steel, and Nikasil-coated bores.
Specifications
| Turning | Swiss CNC (20mm–38mm); Y-axis dual spindle; 9-axis mill/turn—ideal for spool valves and fittings |
| Milling | Horizontal 4th-axis machining for manifold blocks; vertical 3, 4, and 5-axis milling for housings and bodies |
| Honing | ID honing from 0.157″ to 10″ bore diameter for gray iron, ductile iron, steel, stainless steel, and Nikasil-coated components |
| Tolerances | Spool-to-bore clearance: ±0.0002″; thread sealing surfaces machined to drawing specifications; O-ring grooves conform to AS568A |
| Thread Forms | NPT, BSPP, BSPT, SAE ORB, JIC, and ORFS; all standard hydraulic thread and sealing forms |
| Materials | Steel (4140/4340), stainless steel (303/304/316), brass (360/385), and aluminum (6061); all standard hydraulic alloys |
| Volume | Prototype through high-volume production |
| Certifications | ISO 9001:2015 |
Fluid Power Component Types We Produce
Resolute Precision produces a range of precision machined fluid power components, including:
Spool valves and control valves — precision-turned spools with cross-drilled metering ports
Valve bodies and manifold blocks — milled from steel or aluminum with precision-bored port patterns
Hydraulic cylinder components — rods, pistons, end caps, and gland components
Hydraulic fittings — NPT, BSPP, ORFS, JIC, and SAE ORB threaded bodies in steel and brass
Accumulator and reservoir components — precision-turned and milled enclosure components
Pump and motor components — precision-turned shafts, pistons, and valve plates
Frequently Asked Questions
Q: What spool-to-bore clearance can RPM hold on hydraulic valves?
A: We routinely hold spool OD to ±0.0002″ tolerance on our Swiss CNC and turning centers. Bore diameter is held to ±0.0003″ on our turning centers. This produces spool-to-bore diametral clearances in the 0.0003″–0.0006″ range typical for directional control valves.
Q: Can RPM machine hydraulic manifold blocks?
A: Yes. Hydraulic manifold blocks — multi-passage aluminum or steel blocks with intersecting drilled passages and multiple port connections — are produced on our horizontal machining centers with 4th-axis indexing. Complex passage patterns requiring precision port location are within our capability.
Q: Does RPM hone hydraulic cylinder bores?
A: Yes. We offer hydraulic cylinder bore honing through our honing services. We hone bores from 0.157″ to 10″ in diameter in steel, stainless, and Nikasil-coated aluminum cylinders to specified diameter, roundness, and surface finish. See our honing services pages for full specifications.
Q: What thread forms are used in hydraulic systems and can RPM produce all of them?
A: Yes. We produce all standard hydraulic thread forms — NPT (National Pipe Taper), BSPP and BSPT (British Standard Pipe), SAE ORB (O-Ring Boss), JIC 37-degree flare, ORFS (O-Ring Face Seal), and metric thread forms. Thread form and sealing requirement are specified on your drawing.