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Mirror Finished Shock Absorber Piston Rod for Enhanced Sealing Performance
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Mirror Finished Shock Absorber Piston Rod for Enhanced Sealing Performance
  • name
  • name
  • name

Mirror Finished Shock Absorber Piston Rod for Enhanced Sealing Performance

MOQ: 150 sets
Price: Can be disscussed
Standard Packaging: 10-50 PCS in one carton or plastic blister tray, outside wooden pallet or wooden box.
Delivery Period: 15-25days after PO confirmed
Payment Method: L/C,T/T,Western Union
Supply Capacity: 500 sets per day
Detail Information
Product Description
Detail Information
Place of Origin
NINGBO,CHINA
Brand Name
XIAYI
Certification
IATF16949:2016
Model Number
K25-50-1226
Outer Diameter:
12.5MM
Total Length:
390MM
OD Of One End:
M8 X 1.25
OD Of Another End:
M10 X 1.25
Material:
S 45 C
HRC:
> 48
Surface Roughness:
Rz0.2~0.4 / Ra0.1max
Salt Spray:
48hrs - 120hours(Chromed)
Product Description
Mirror Finished Shock Absorber Piston Rod — Precision Surface for Ultimate Seal Integrity

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 Application

Superior 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 Overview
Product TypeShock Absorber Hollow Piston Rod
Material OptionsStainless Steel, Steel Alloy, Copper, Brass, Titanium Steel
Machining MethodsTurning, Milling, Drilling, Threading, Stamping, Punching
Surface Finish OptionsPolishing, Chrome Plating, Zinc Plating, Blackening, Nickel Plating, Electrophoresis, Anodization, Oxidation
ColorMetal colors available
OEM & ODMAvailable
ROHS ComplianceAvailable
Dimensional & Surface Specifications
Outer DiameterØ12.5 (-0.01/-0.03) mm
Total Length270 mm
Steel MaterialCK45 / ST52 / 20MnV6 / 42CrMo4 / 40Cr / Bearing Steel / Stainless Steel
Diameter ToleranceISO f7
Chrome Thickness20 ~ 30 μm
Chrome Layer Hardness950 HV Minimum
Surface RoughnessRa 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 Resistance48 – 120 hours (Chromed)
Supply Condition Options
  • Hard Chrome Plated
  • Induction Hardened
  • Quenched & Tempered (Q&T)
  • Induction Hardened with Q&T
Chemical Composition by Material Grade
MaterialC%Mn%Si%S%P%V%Cr%
CK450.42–0.500.50–0.800.17–0.37≤0.035≤0.035—≤0.25
ST52≤0.22≤1.60≤0.55≤0.040≤0.0400.02–0.15—
20MnV60.17–0.241.30–1.700.10–0.50≤0.035≤0.0350.10–0.20≤0.30
42CrMo40.38–0.450.50–0.800.17–0.37≤0.035≤0.0350.07–0.120.90–1.20
40Cr0.37–0.450.50–0.800.17–0.37≤0.035≤0.035—0.80–1.10
Mechanical Properties by Material & Condition
MaterialTensile Strength (N/mm²)Yield Strength (N/mm²)Elongation % (Min)Charpy ImpactCondition
CK4561035515>41 JNormalized
CK4580063020>41 JQ + T
ST5250035522—Normalized
20MnV675059012>40 JNormalized
42CrMo498085014>47 JQ + T
40Cr100080010—Q + T
Manufacturing Process Flow
  1. Hydraulic Steel Raw Material Cutting
  2. CNC Machining with Broaching & Milling Operations
  3. Induction Hardening
  4. Hard Chrome Plating
  5. Dehydrogenation & Tempering
  6. Polish & Superfinish Polish (Mirror Grade)
  7. 100% Final Dimensional & Surface Inspection
  8. Craft Boxes & Wooden Case Packaging
Quality Infrastructure & Capabilities
Quality SystemIATF 16949:2016 Certified / SGS / TÜV
Surface TreatmentsBlackening, Polishing, Anodize, Chrome Plating, Zinc Plating, Nickel Plating, Grinding
Drawing FormatsSolidWorks, Pro/Engineer, AutoCAD, UG, PDF
Core EquipmentJapan 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 InstrumentsVMS 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 ApplicationsPrecision Instruments, Surgical Equipment, Automotive Parts, Optical Products, LED Flashlights, Electronics Parts, Precision Tools
Why Customers Choose Our Mirror Finished Rods
  • One-stop total solution — from material selection through final surface treatment under one roof
  • Professional, skilled engineering team with reliable project management
  • Ready-stock on standard sizes for fast-turn prototype and trial orders
  • Fully customizable — non-standard dimensions, special materials, and custom surface finishes available
  • Small quantity orders accepted for new project validation
  • Quality commitment — refund or replacement for any verified product defect
Frequently Asked Questions

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 Western Union. 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.

Product Image Mirror Finished Shock Absorber Piston Rod — precision surface finish for enhanced sealing
Tags: 

hydraulic piston rod,  

hollow piston rod,  

shock absorber rod

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Products
PRODUCTS DETAILS
Products

Shock Absorber Parts

Shock Absorber Piston

Banded Piston

Shock Absorber Mounting

Shock Absorber Guide

Shock Base Valve

Shock Oil Seal

Shock Valve Shims

Shock Absorber Bracket

Shock Absorber Piston Rod

Shock Piston Machine

Du Bushing

PTFE Bands

PTFE Ring Gasket

PTFE Parts

Guide Ring
Mirror Finished Shock Absorber Piston Rod for Enhanced Sealing Performance
  • name
  • name
  • name
Mirror Finished Shock Absorber Piston Rod for Enhanced Sealing Performance
MOQ: 150 sets
Price: Can be disscussed
Standard Packaging: 10-50 PCS in one carton or plastic blister tray, outside wooden pallet or wooden box.
Delivery Period: 15-25days after PO confirmed
Payment Method: L/C,T/T,Western Union
Supply Capacity: 500 sets per day
Detail Information
Product Description
Detail Information
Place of Origin
NINGBO,CHINA
Brand Name
XIAYI
Certification
IATF16949:2016
Model Number
K25-50-1226
Outer Diameter:
12.5MM
Total Length:
390MM
OD Of One End:
M8 X 1.25
OD Of Another End:
M10 X 1.25
Material:
S 45 C
HRC:
> 48
Surface Roughness:
Rz0.2~0.4 / Ra0.1max
Salt Spray:
48hrs - 120hours(Chromed)
Minimum Order Quantity:
150 sets
Price:
Can be disscussed
Packaging Details:
10-50 PCS in one carton or plastic blister tray, outside wooden pallet or wooden box.
Delivery Time:
15-25days after PO confirmed
Payment Terms:
L/C,T/T,Western Union
Supply Ability:
500 sets per day
Product Description
Mirror Finished Shock Absorber Piston Rod — Precision Surface for Ultimate Seal Integrity

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 Application

Superior 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 Overview
Product TypeShock Absorber Hollow Piston Rod
Material OptionsStainless Steel, Steel Alloy, Copper, Brass, Titanium Steel
Machining MethodsTurning, Milling, Drilling, Threading, Stamping, Punching
Surface Finish OptionsPolishing, Chrome Plating, Zinc Plating, Blackening, Nickel Plating, Electrophoresis, Anodization, Oxidation
ColorMetal colors available
OEM & ODMAvailable
ROHS ComplianceAvailable
Dimensional & Surface Specifications
Outer DiameterØ12.5 (-0.01/-0.03) mm
Total Length270 mm
Steel MaterialCK45 / ST52 / 20MnV6 / 42CrMo4 / 40Cr / Bearing Steel / Stainless Steel
Diameter ToleranceISO f7
Chrome Thickness20 ~ 30 μm
Chrome Layer Hardness950 HV Minimum
Surface RoughnessRa 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 Resistance48 – 120 hours (Chromed)
Supply Condition Options
  • Hard Chrome Plated
  • Induction Hardened
  • Quenched & Tempered (Q&T)
  • Induction Hardened with Q&T
Chemical Composition by Material Grade
MaterialC%Mn%Si%S%P%V%Cr%
CK450.42–0.500.50–0.800.17–0.37≤0.035≤0.035—≤0.25
ST52≤0.22≤1.60≤0.55≤0.040≤0.0400.02–0.15—
20MnV60.17–0.241.30–1.700.10–0.50≤0.035≤0.0350.10–0.20≤0.30
42CrMo40.38–0.450.50–0.800.17–0.37≤0.035≤0.0350.07–0.120.90–1.20
40Cr0.37–0.450.50–0.800.17–0.37≤0.035≤0.035—0.80–1.10
Mechanical Properties by Material & Condition
MaterialTensile Strength (N/mm²)Yield Strength (N/mm²)Elongation % (Min)Charpy ImpactCondition
CK4561035515>41 JNormalized
CK4580063020>41 JQ + T
ST5250035522—Normalized
20MnV675059012>40 JNormalized
42CrMo498085014>47 JQ + T
40Cr100080010—Q + T
Manufacturing Process Flow
  1. Hydraulic Steel Raw Material Cutting
  2. CNC Machining with Broaching & Milling Operations
  3. Induction Hardening
  4. Hard Chrome Plating
  5. Dehydrogenation & Tempering
  6. Polish & Superfinish Polish (Mirror Grade)
  7. 100% Final Dimensional & Surface Inspection
  8. Craft Boxes & Wooden Case Packaging
Quality Infrastructure & Capabilities
Quality SystemIATF 16949:2016 Certified / SGS / TÜV
Surface TreatmentsBlackening, Polishing, Anodize, Chrome Plating, Zinc Plating, Nickel Plating, Grinding
Drawing FormatsSolidWorks, Pro/Engineer, AutoCAD, UG, PDF
Core EquipmentJapan 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 InstrumentsVMS 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 ApplicationsPrecision Instruments, Surgical Equipment, Automotive Parts, Optical Products, LED Flashlights, Electronics Parts, Precision Tools
Why Customers Choose Our Mirror Finished Rods
  • One-stop total solution — from material selection through final surface treatment under one roof
  • Professional, skilled engineering team with reliable project management
  • Ready-stock on standard sizes for fast-turn prototype and trial orders
  • Fully customizable — non-standard dimensions, special materials, and custom surface finishes available
  • Small quantity orders accepted for new project validation
  • Quality commitment — refund or replacement for any verified product defect
Frequently Asked Questions

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 Western Union. 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.

Product Image Mirror Finished Shock Absorber Piston Rod — precision surface finish for enhanced sealing
Tags: 

hydraulic piston rod,

hollow piston rod,

shock absorber rod

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