Ningbo XiaYi Electromechanical Technology Co.,Ltd.
| Surface roughness | Rz0.2~0.4 / Ra0.1max |
| Delivery Time | 15-25days after PO confirmed |
| HRC | > 48 |
| Payment Terms | L/C,T/T, |
| Total Length | 390MM |
| Material | S 45 C |
| OD of one end | M8 X 1.25 |
| OD of another end | M10 X 1.25 |
| Supply Ability | 500 sets per day |
| Outer Diameter | 12.5MM |
| Salt spray | 48hrs - 120hours(Chromed) |
| Packaging Details | 10-50 PCS in one carton or plastic blister tray, outside wooden pallet or wooden box. |
| Model Number | K25-50-1226 |
| Brand Name | XIAYI |
| Certification | IATF16949:2016 |
| Place of Origin | NINGBO,CHINA |
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Product Specification
| Surface roughness | Rz0.2~0.4 / Ra0.1max | Delivery Time | 15-25days after PO confirmed |
| HRC | > 48 | Payment Terms | L/C,T/T, |
| Total Length | 390MM | Material | S 45 C |
| OD of one end | M8 X 1.25 | OD of another end | M10 X 1.25 |
| Supply Ability | 500 sets per day | Outer Diameter | 12.5MM |
| Salt spray | 48hrs - 120hours(Chromed) | Packaging Details | 10-50 PCS in one carton or plastic blister tray, outside wooden pallet or wooden box. |
| Model Number | K25-50-1226 | Brand Name | XIAYI |
| Certification | IATF16949:2016 | Place of Origin | NINGBO,CHINA |
| High Light | mirror finished shock absorber piston rod ，shock absorber piston rod with enhanced sealing ，high performance shock absorber piston rod | ||
The surface quality of a piston rod directly determines the life of the shock absorber seal. Our Mirror Finished Piston Rod achieves an ultra-smooth Ra 0.1 μm (max) finish through superfinish polishing after hard chrome plating, creating an exceptionally low-friction interface that minimizes seal wear, prevents micro-leakage, and ensures consistent damping performance across the full service life of the shock absorber. With ISO f7 diameter tolerance and chrome hardness reaching 950 HV minimum, this rod is engineered for the most demanding OEM applications where sealing reliability is non-negotiable.
What the Mirror Finish Means for Your ApplicationSuperior Seal Longevity: Surface roughness as low as Ra 0.1 μm reduces the coefficient of friction at the seal-rod interface by up to 40% compared to conventional finishes, effectively extending seal replacement intervals and reducing field service costs.
Leak-Proof Performance: The mirror-grade surface combined with ISO f7 diameter tolerance (±0.02 mm on Ø12.5 mm) ensures a perfectly uniform oil film distribution, preventing both dry-running seal damage and bypass leakage under high-frequency cycling.
Validated Corrosion Resistance: Salt spray resistance rated at 48–120 hours (chromed) per independent testing, ensuring reliable performance in coastal regions, winter road conditions, and high-humidity environments where ordinary rods degrade prematurely.
Material Flexibility with Full Traceability: Available in CK45, ST52, 20MnV6, 42CrMo4, 40Cr, bearing steel, and stainless steel grades — each with documented chemical composition and mechanical property certificates. Choose the optimal grade for your strength, fatigue, and cost requirements.
| Product Type | Shock Absorber Hollow Piston Rod |
|---|---|
| Material Options | Stainless Steel, Steel Alloy, Copper, Brass, Titanium Steel |
| Machining Methods | Turning, Milling, Drilling, Threading, Stamping, Punching |
| Surface Finish Options | Polishing, Chrome Plating, Zinc Plating, Blackening, Nickel Plating, Electrophoresis, Anodization, Oxidation |
| Color | Metal colors available |
| OEM & ODM | Available |
| ROHS Compliance | Available |
| Outer Diameter | Ø12.5 (-0.01/-0.03) mm |
|---|---|
| Total Length | 270 mm |
| Steel Material | CK45 / ST52 / 20MnV6 / 42CrMo4 / 40Cr / Bearing Steel / Stainless Steel |
| Diameter Tolerance | ISO f7 |
| Chrome Thickness | 20 ~ 30 μm |
| Chrome Layer Hardness | 950 HV Minimum |
| Surface Roughness | Ra 0.1 μm (Max) — Mirror Grade |
| Straightness | ≤ 0.2 mm / 1000 mm |
| Yield Strength | ≥ 350 MPa (CK45 normalized) |
| Tensile Strength | ≥ 580 MPa (CK45 normalized) |
| Elongation | ≥ 15% |
| Salt Spray Resistance | 48 – 120 hours (Chromed) |
| Material | C% | Mn% | Si% | S% | P% | V% | Cr% |
|---|---|---|---|---|---|---|---|
| CK45 | 0.42–0.50 | 0.50–0.80 | 0.17–0.37 | ≤0.035 | ≤0.035 | — | ≤0.25 |
| ST52 | ≤0.22 | ≤1.60 | ≤0.55 | ≤0.040 | ≤0.040 | 0.02–0.15 | — |
| 20MnV6 | 0.17–0.24 | 1.30–1.70 | 0.10–0.50 | ≤0.035 | ≤0.035 | 0.10–0.20 | ≤0.30 |
| 42CrMo4 | 0.38–0.45 | 0.50–0.80 | 0.17–0.37 | ≤0.035 | ≤0.035 | 0.07–0.12 | 0.90–1.20 |
| 40Cr | 0.37–0.45 | 0.50–0.80 | 0.17–0.37 | ≤0.035 | ≤0.035 | — | 0.80–1.10 |
| Material | Tensile Strength (N/mm²) | Yield Strength (N/mm²) | Elongation % (Min) | Charpy Impact | Condition |
|---|---|---|---|---|---|
| CK45 | 610 | 355 | 15 | >41 J | Normalized |
| CK45 | 800 | 630 | 20 | >41 J | Q + T |
| ST52 | 500 | 355 | 22 | — | Normalized |
| 20MnV6 | 750 | 590 | 12 | >40 J | Normalized |
| 42CrMo4 | 980 | 850 | 14 | >47 J | Q + T |
| 40Cr | 1000 | 800 | 10 | — | Q + T |
| Quality System | IATF 16949:2016 Certified / SGS / TÜV |
|---|---|
| Surface Treatments | Blackening, Polishing, Anodize, Chrome Plating, Zinc Plating, Nickel Plating, Grinding |
| Drawing Formats | SolidWorks, Pro/Engineer, AutoCAD, UG, PDF |
| Core Equipment | Japan TSUGAMI B-038T 5-Axis CNC Turning, Japan GAMA DMN-650 4-Axis Machining Center, Cylindrical Bore Grinders, Wire EDM, Magnetic Grinding & Vibration Machining, Oven, Ultrasonic Cleaning, Vacuum Packing |
| Inspection Instruments | VMS 2.5D Measuring Machine, Mitutoyo Tool Microscope, Mitutoyo Digimatic Micrometer, Mitutoyo Hardness Tester, Mitutoyo Calipers, Mitutoyo Dial Indicator, Mitutoyo Height Gauge, Mitutoyo Tubular Inside Micrometer, Marble Platform, Go/No-Go Gauges, Electronic Digital Caliper, Ring Gauges |
| Industry Applications | Precision Instruments, Surgical Equipment, Automotive Parts, Optical Products, LED Flashlights, Electronics Parts, Precision Tools |
Q1: What makes the mirror finish different from your standard chrome plated rod?
The mirror finish undergoes an additional superfinish polishing step after chrome plating, achieving surface roughness as low as Ra 0.1 μm compared to Ra 0.2 μm on standard rods. This 50% smoother surface significantly reduces seal friction and extends seal life, making it the preferred choice for premium OEM shock absorbers where warranty claims from oil leakage must be minimized.
Q2: Are you a manufacturer or trading company?
We are a direct manufacturer with over 15 years in precision CNC machining. Our IATF 16949:2016 certified facility in Ningbo, China is open for customer audits at any time.
Q3: How do I select the right steel grade for my application?
The choice depends on your strength and fatigue requirements. CK45 is our most economical general-purpose grade. 42CrMo4 offers the highest strength (980 MPa tensile, 850 MPa yield in Q+T condition) for heavy-duty applications. For corrosive environments, stainless steel is recommended. Our engineering team can review your specifications and recommend the optimal grade — simply send us your drawing.
Q4: What is your typical production lead time?
5 working days for in-stock standard sizes; 15–45 days for mass production orders depending on quantity, material, and surface treatment complexity.
Q5: What payment terms do you accept?
We accept T/T, L/C at sight, and . Standard terms are 30% deposit upon order confirmation and 70% balance before shipment.
Q6: Can you provide salt spray test reports for each batch?
Yes. Salt spray testing per ASTM B117 or ISO 9227 is available upon request. Our chromed rods typically achieve 48–120 hours of neutral salt spray resistance. Test certificates are included with shipment for traceability.
Q7: Do you accept small trial orders for testing before mass production?
Yes, we welcome small quantity orders for prototype evaluation and new project validation. Our standard MOQ is 150 sets for production runs, but we can accommodate smaller trial quantities — contact our sales team with your requirements.
Company Details
Business Type:
Manufacturer
Year Established:
2006
Total Annual:
1500000-5000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Founded in 2006 and headquartered in the strategic port city of Ningbo, China, XIAYI is a premier high-tech manufacturer specializing in the research, development, and production of precision shock absorber components and automated assembly equipment. With nearly two decades of indust... Founded in 2006 and headquartered in the strategic port city of Ningbo, China, XIAYI is a premier high-tech manufacturer specializing in the research, development, and production of precision shock absorber components and automated assembly equipment. With nearly two decades of indust...
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