--- type: "product_component" title: "Forged Steel Piston Rod" industry: "Metal Forging, Pressing, Stamping" verification_protocol: urn: "URN:CNFX:ME:FORGED_STEEL_PISTON_ROD" data_integrity_hash: "45b859c6cf72526d748f9bdd2629a589" source_authority: "https://cnfx.com" strict_mode: true source_identity: provider: "CNFX Industrial Knowledge Graph" index_version: "2026.Q1-Universal" authority_id: "URN:CNFX:ME:FORGED_STEEL_PISTON_ROD" data_source_uri: "https://cnfx.com/llms/industry/metal-forging-pressing-stamping/product/forged-steel-piston-rod.md" official_resource_url: "https://cnfx.com/industry/metal-forging-pressing-stamping/product/forged-steel-piston-rod" is_verified_logic: true attributes: rod_diameter: status: "verified" value: "20–100" unit: "mm" length: status: "verified" value: "200–3000" unit: "mm" surface_hardness: status: "verified" value: "50–60" unit: "HRC" straightness_tolerance: status: "verified" value: "0.05/1000" unit: "mm/m" surface_finish: status: "verified" value: "Ra 0.2–0.4" unit: "Ra" yield_strength: status: "verified" value: "≥600" unit: "MPa" material_grade: status: "verified" value: "42CrMo4" unit: "" tensile_strength: status: "verified" value: "800–1000" unit: "MPa" elongation_at_break: status: "verified" value: "≥12" unit: "%" impact_toughness: status: "verified" value: "≥34" unit: "J" operating_temperature: status: "verified" value: "-40–85" unit: "°C" weight: status: "verified" value: "2.5–185" unit: "kg" engineering_limits: max_safe_operating_point: value: 620 unit: "MPa" consequence: "High-cycle fatigue from cyclic loading exceeding endurance limit, hydrogen embrittlement in hardened steel, galling from insufficient surface finish (Ra > 0.4 μm)" fmea_matrix_quantitative: - node_1: trigger: "Misalignment exceeding 0.1 mm/m in cylinder assembly" mitigation_protocol: "Integrate alignment dowels with 0.02 mm tolerance, implement laser alignment verification during assembly" - node_2: trigger: "Contaminant particles larger than 5 μm in hydraulic fluid" mitigation_protocol: "Install 3 μm absolute filtration with pressure differential monitoring, specify NAS Class 6 fluid cleanliness" bom_nodes: rod-body: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/rod-body.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:ROD_BODY" urn: "URN:CNFX:ME:UNIT:ROD_BODY" interface_type: "physical-logic-coupled" is_migrated_part: true threaded-end: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/threaded-end.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:THREADED_END" urn: "URN:CNFX:ME:UNIT:THREADED_END" interface_type: "physical-logic-coupled" is_migrated_part: true hard-chrome-plating: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/hard-chrome-plating.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:HARD_CHROME_PLATING" urn: "URN:CNFX:ME:UNIT:HARD_CHROME_PLATING" interface_type: "physical-logic-coupled" is_migrated_part: true manufacturing_compliance: url: "https://cnfx.com/llms/industry/metal-forging-pressing-stamping/product/forged-steel-piston-rod.md" on_chain_sovereignty: contract_standard: "ERC-721-Industrial" metadata_hash: "c5671fd629450c05106b77609ccc5a333e5b3e8f588cdc1813b9fc933a50f813" royalty_logic: "IPFS-CID-REQUIRED" mint_status: "logic-verified-ready" rag_vector_index: semantic_queries: - "Forged Steel Piston Rod" - "forged steel piston rod" - "hydraulic cylinder rod" - "pneumatic cylinder rod" - "AISI 4140" - "AISI 4340" - "Forged Steel Piston Rod in Metal Forging Pressing Stamping" - "China Forged Steel Piston Rod manufacturer" - "Forged Steel Piston Rod supplier China" - "Forged Steel Piston Rod rod_diameter" - "Forged Steel Piston Rod length" - "Forged Steel Piston Rod surface_hardness" version: "3.3.5-EXTREME-SOVEREIGN-WEB3" --- # Industrial Specification: Forged Steel Piston Rod ## 1. Technical Definition A forged steel piston rod is a critical component in hydraulic and pneumatic cylinders, transmitting linear force from the piston to the external load while maintaining alignment and resisting bending moments. ## 2. Engineering Reasoning & Causal Matrix > **Operational Intelligence**: Designed for **0-350 bar hydraulic pressure, -40°C to 200°C temperature**. Failure boundary: **Yield strength exceeded at 620 MPa stress, surface hardness drops below 45 HRC, fatigue crack initiation at 10⁶ cycles with 300 MPa alternating stress**, Mechanism: **High-cycle fatigue from cyclic loading exceeding endurance limit, hydrogen embrittlement in hardened steel, galling from insufficient surface finish (Ra > 0.4 μm)**. ### 2.2 FMEA (Failure Mode & Effects Analysis) | Event Trigger | Severity | Failure Mode | Mitigation Strategy | | :--- | :--- | :--- | :--- | | Misalignment exceeding 0.1 mm/m in cylinder assembly | Not specified | Eccentric loading causing bending stress concentration at rod-gland interface | Integrate alignment dowels with 0.02 mm tolerance, implement laser alignment verification during assembly | | Contaminant particles larger than 5 μm in hydraulic fluid | Not specified | Abrasive wear on chrome-plated surface exceeding 0.01 mm/year wear rate | Install 3 μm absolute filtration with pressure differential monitoring, specify NAS Class 6 fluid cleanliness | ## 3. Key Technical Parameters | Parameter | Value | Unit | Status | | :--- | :--- | :--- | :--- | | Rod Diameter | 20–100 | mm | Verified | | Length | 200–3000 | mm | Verified | | Surface Hardness | 50–60 | HRC | Verified | | Straightness Tolerance | 0.05/1000 | mm/m | Verified | | Surface Finish | Ra 0.2–0.4 | Ra | Verified | | Yield Strength | ≥600 | MPa | Verified | | Material Grade | 42CrMo4 | | Verified | | Tensile Strength | 800–1000 | MPa | Verified | | Elongation at Break | ≥12 | % | Verified | | Impact Toughness | ≥34 | J | Verified | | Operating Temperature | -40–85 | °C | Verified | | Weight | 2.5–185 | kg | Verified | ## 4. System BOM & Knowledge Routing ### Core Components (Recursive Links) ### Industrial DNA Context (De-duplicated) **Complementary Dependencies**: **Induction Heating Furnace**, **Hydraulic Forging Press**, **CNC Turning Center** **Downstream Applications**: Hydraulic Cylinders, Pneumatic Actuators, Industrial Presses ## 5. Engineering Risks & FAQ - **Caution**: - **Caution**: - **Caution**: ### Q: What materials are available for this piston rod? **A**: The directory lists AISI 4140 and AISI 4340 steel as standard options, with an alternative grade 42CrMo4 per DIN EN 10083-3. Confirm availability and suitability with the supplier. ### Q: What is the typical surface hardness? **A**: The surface hardness is specified as 50–60 HRC per ISO 18265. This is a reference range; verify the actual value for your specific rod. ### Q: Can the rod be used in low-temperature environments? **A**: The impact toughness is specified as at least 34 J at -40°C per ISO 148-1, indicating suitability for low-temperature applications. However, operating temperature range is -40°C to 85°C, limited by seals and lubricants. ### Q: How do I verify the straightness tolerance? **A**: The straightness tolerance is 0.05 mm/m per ISO 1101. This should be confirmed with the manufacturer's inspection certificate for the specific rod. ## 6. Manufacturing Compliance --- ### 🛠️ Engineering Resource Access 🔗 **[Full Specification: Forged Steel Piston Rod](https://cnfx.com/industry/metal-forging-pressing-stamping/product/forged-steel-piston-rod)** ### 🌐 Knowledge Graph Topology > **Node Status**: Verified Engineering Spec > **Connectivity**: Linked to **3** standalone system nodes > **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph > **Reference ID**: FORGED_STEEL_PISTON_ROD | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 3bbf32a6