---
title: "Spool and Sleeve Assembly"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SPOOL_AND_SLEEVE_ASSEMBLY"
  data_integrity_hash: "9fdb7696f15c25d6775c8863e468ebd4"
  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:SPOOL_AND_SLEEVE_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/spool-and-sleeve-assembly.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/spool-and-sleeve-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-21 MPa (5-210 bar) at 40°C hydraulic fluid temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: "N/A"
    unit: "N/A"
    consequence: "Hydrodynamic lubrication breakdown at Reynolds number &lt;1000 causing boundary layer collapse and metal-to-metal contact"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Particulate contamination &gt;NAS 1638 Class 6 (particles &gt;5 μm)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install dual 3 μm absolute filtration with differential pressure monitoring"
  - node_2:
      trigger: "Thermal expansion mismatch (spool: 11.7×10⁻⁶/°C steel vs sleeve: 16.5×10⁻⁶/°C bronze)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Material pairing optimization with Inconel 718 spool (13.0×10⁻⁶/°C) and hardened steel sleeve"
bom_nodes:
  spool:
    type: "part"
    urn: "URN:CNFX:ME:SPOOL"
    interface_type: "physical-logic-coupled"
  sleeve:
    type: "component"
    urn: "URN:CNFX:ME:SLEEVE"
    interface_type: "physical-logic-coupled"
  seals:
    type: "component"
    urn: "URN:CNFX:ME:SEALS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-2:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS (GPS) - ISO CODE SYSTEM FOR TOLERANCES ON LINEAR SIZES)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B4.1-1967 (R2019) (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 7154-1:2016 (ISO SYSTEM OF LIMITS AND FITS - BASIS OF TOLERANCES, DEVIATIONS AND FITS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/spool-and-sleeve-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "fc8ffd7768d0b2ef732ea4209425b7581d3ea3929bdb3f448e5eee00d582692a"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Spool and Sleeve Assembly

## 1. Technical Definition
A precision assembly consisting of a spool and sleeve that controls fluid flow in a servo control valve.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-21 MPa (5-210 bar) at 40°C hydraulic fluid temperature**. Failure boundary: **Radial clearance exceeds 8 μm or spool-sleeve concentricity deviation &gt;15 μm**, Mechanism: **Hydrodynamic lubrication breakdown at Reynolds number &lt;1000 causing boundary layer collapse and metal-to-metal contact**.

### 2.1 Analytical Physics Model
Governed by the **L10 Bearing Life & Fatigue Model**:

> **Primary Equation**: $L_{10} = (\frac{C}{P})^p$  
> **Engineering Impact**: Predicts mechanical lifecycle before component fatigue.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| C | Dynamic Load Rating | Engineering Constant |
| P | Equivalent Dynamic Load | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Particulate contamination &gt;NAS 1638 Class 6 (particles &gt;5 μm) | 8 | Spool seizure due to abrasive wear at contact surfaces | Install dual 3 μm absolute filtration with differential pressure monitoring |
| Thermal expansion mismatch (spool: 11.7×10⁻⁶/°C steel vs sleeve: 16.5×10⁻⁶/°C bronze) | 8 | Increased friction torque exceeding 0.8 N·m at 80°C | Material pairing optimization with Inconel 718 spool (13.0×10⁻⁶/°C) and hardened steel sleeve |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Spool](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/spool.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Coordinate Measuring Machine**, **Hydraulic Test Bench**  
**Downstream Applications**: Servo Control Valves, Hydraulic Actuators, Industrial Automation Systems  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are used in your spool and sleeve assemblies?
**A**: Our assemblies are manufactured using hardened steel, stainless steel, and bronze alloys to ensure durability, corrosion resistance, and precise fluid control in demanding industrial environments.

### Q: How does the spool and sleeve assembly control fluid flow?
**A**: The precision-machined spool moves within the sleeve to open and close fluid passages, regulating flow direction and volume in servo control valves with high accuracy and repeatability.

### Q: What applications are these assemblies suitable for?
**A**: These assemblies are designed for machinery and equipment manufacturing applications requiring precise fluid control, including hydraulic systems, industrial automation, and servo valve applications in various industrial sectors.

## 6. Manufacturing Compliance
- ISO 286-2:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS (GPS) - ISO CODE SYSTEM FOR TOLERANCES ON LINEAR SIZES)
- ANSI B4.1-1967 (R2019) (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)
- DIN 7154-1:2016 (ISO SYSTEM OF LIMITS AND FITS - BASIS OF TOLERANCES, DEVIATIONS AND FITS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Spool and Sleeve Assembly](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/spool-and-sleeve-assembly)**

### 🌐 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**: SPOOL_AND_SLEEVE_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 510a669d
