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CNC Plungers & Push Rods Technical Specifications
| Shaft Types | Guide Shafts, Drive Shafts, Spindle Shafts, Pump Impeller Shafts, Motor Shafts |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, CNC Cylindrical Grinders, Machining Centers |
| Length-to-Diameter Ratio | Up to 15:1 (Without deflection during machining) |
| Dimensional & Geometric Tolerances | Diameter: ±0.002mm; Straightness: 0.005mm/100mm; Cylindricity: 0.003mm |
| Common Materials | SUJ2, 42CrMo, 40Cr, SUS440C, SUS304, SUS316L |
| Heat Treatment | Quenching & Tempering, Induction Hardening (HRC 55-62 on journals) |
| Surface Roughness (Ra) | Ground Bearing Journals: Ra 0.2 - Ra 0.4; Turned Surfaces: Ra 0.8 |
| Machining Features | Cross-drilled Holes, Keyways, Micro-Threads, Custom Tapers, Relieve Grooves |
| Inspection Equipment | Japanese/German Roundness Testers, CMM, Hardness Testers, Profilometers |
CNC Plungers & Push Rods for Demanding Industrial Applications
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium CNC Plungers & Push Rods for the automotive, medical, and industrial machinery sectors. Slender shafts—characterized by their high length-to-diameter ratios—are critical drive and guiding components that demand extreme straightness, superior surface finishes, and impeccable fatigue resistance. In precision applications, even a microscopic deviation in cylindricity or straightness can lead to excessive vibration, bearing wear, and system failure.
To achieve flawless results, our production facility is equipped with Japanese imported Star CNC Swiss-type lathes and advanced precision cylindrical grinders. The guide bushing technology on our Swiss lathes provides continuous support to the bar stock, completely eliminating deflection when machining long, slender geometries. This specialized equipment allows us to turn, drill, and thread complex features in a single continuous setup, ensuring absolute concentricity between the bearing journals and the shaft body.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as SUJ2 bearing steel, 42CrMo, and SUS440C stainless steel. To guarantee reliable product performance, we apply strict quality inspection protocols utilizing a complete set of testing instruments imported directly from Japan and Germany. We keep innovating to maintain sound business development and warmly welcome domestic and overseas clients to visit our factory and explore custom OEM/ODM cooperation opportunities.
Core Advantages of Xierge CNC Plungers & Push Rods
- Zero-Deflection Swiss Machining: Our Japanese Star CNC Swiss-type lathes utilize continuous guide bushing support, enabling the machining of long, slender shafts (up to 15:1 L/D ratio) without bending or vibration.
- Extreme Straightness Control: By optimizing cutting parameters and utilizing rigid tooling, we maintain exceptional straightness tolerances (0.005mm/100mm), critical for high-speed rotating applications.
- Advanced Precision Grinding: Equipped with high-precision CNC cylindrical grinders, we achieve mirror-like finishes (Ra 0.2) on bearing journals, extending bearing lifespan and reducing friction heat.
- Thermal Deformation Correction: For hardened slender shafts, we meticulously manage heat treatment and utilize grinding post-treatment to correct any micro-warping, restoring exact geometric tolerances.
- Complex Single-Setup Machining: Multi-axis live tooling allows us to turn, drill cross-holes, and mill keyways in one continuous operation, maintaining absolute concentricity across all features.
- World-Class Metrology Assurance: Our quality lab utilizes imported Japanese and German roundness testers and CMMs to precisely map straightness, cylindricity, and coaxiality on every batch.
- 3-Decade OEM/ODM Expertise: Since 1990, we have continuously innovated, providing DFM (Design for Manufacturing) optimization for custom slender shaft designs, seamlessly scaling from prototyping to mass production.
Payment Methods & Global Logistics Solutions
Secure International Payment Terms:
To facilitate smooth B2B international trade, we offer flexible and secure payment options. For mass production orders of CNC Plungers & Push Rods, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale automotive or industrial supply contracts, we are fully capable of processing Irrevocable Letters of Credit (L/C) at sight. For initial prototyping, sample orders, or custom tooling fees, PayPal and Western Union are also available to expedite the process.
Global Logistics & Protective Packaging:
We provide comprehensive end-to-end shipping solutions under FOB, CIF, and DAP Incoterms. For urgent prototypes or small batches, we utilize expedited international couriers such as DHL, FedEx, and UPS. For bulk mass production, we offer highly competitive sea freight (LCL/FCL) and air cargo rates through our trusted global forwarder network. Recognizing that slender shafts are highly susceptible to bending and surface damage during transit, we utilize specialized packaging: each shaft is individually wrapped in VCI (Volatile Corrosion Inhibitor) anti-rust paper, suspended in custom rigid cardboard tubes or EPE foam slots to prevent any point contact, and packed in sturdy export-grade wooden cases to ensure zero deformation during international transit.
FAQ
We utilize Japanese Star CNC Swiss-type lathes equipped with guide bushings. The guide bushing provides continuous, close-fitting support to the bar stock right at the cutting point. This completely eliminates the deflection that traditional lathes experience when machining long, slender components, allowing us to maintain strict straightness and cylindricity tolerances.
Long shafts naturally warp during induction hardening or quenching. We solve this by leaving a specific grinding allowance before heat treatment. Post-treatment, we utilize precision CNC cylindrical grinders to systematically remove the allowance and correct the micro-deformation. This restores the shaft's straightness and bearing journal dimensions to exact micro-tolerances.
Yes. Our Swiss-type lathes are equipped with live tooling and Y-axis capabilities. This allows us to perform radial drilling, milling of flats, and cutting keyways directly on the machine in a single setup. Because the part is not transferred to secondary machines, we maintain perfect concentricity between the bearing journals and the machined features.
Standard hand tools cannot measure these geometric tolerances accurately. We utilize imported Japanese and German Coordinate Measuring Machines (CMM) and precision roundness testers. The shaft is supported on V-blocks or centers, and the machine traces multiple points along the length and circumference to map straightness, cylindricity, and coaxiality.
For high-speed applications requiring excellent wear resistance and fatigue strength, we highly recommend SUJ2 bearing steel or 42CrMo alloy steel. After proper induction hardening, these materials provide a hard, wear-resistant surface (HRC 58+) while maintaining a tough, fracture-resistant core to absorb dynamic loads.
Slender shafts are highly vulnerable to bending under their own weight or external impact. We package them in custom rigid cardboard tubes or specialized wooden crates with closely spaced EPE foam slots. The shafts are fully supported along their entire length, preventing any sagging or point-loading, and sealed in VCI anti-rust paper to prevent oxidation during ocean transit.
