---
title: "Lead Screw"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:LEAD_SCREW"
  data_integrity_hash: "85f97cb178651ba7f4024353c1cb9359"
  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:LEAD_SCREW"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/lead-screw.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/lead-screw"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "Axial load 0-5000 N, rotational speed 0-3000 rpm, temperature -40°C to 120°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 345
    unit: "MPa"
    consequence: "Thread shear failure due to Tresca yield criterion violation under combined torsional and axial loading, or wear-induced backlash from abrasive particle contamination exceeding 15 μm size"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Lubricant starvation causing boundary lubrication regime"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated grease reservoir with 5 μm filtration and wear-resistant coating (DLC or TiN) on thread flanks"
  - node_2:
      trigger: "Misalignment exceeding 0.02 mm/mm over 300 mm length"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Self-aligning nut design with spherical washers and alignment tolerance of 0.005 mm/mm"
bom_nodes:
  threads:
    type: "component"
    urn: "URN:CNFX:ME:THREADS"
    interface_type: "physical-logic-coupled"
  shaft-body:
    type: "component"
    urn: "URN:CNFX:ME:SHAFT_BODY"
    interface_type: "physical-logic-coupled"
  end-machining:
    type: "component"
    urn: "URN:CNFX:ME:END_MACHINING"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 2904:2010 (LEAD SCREWS FOR MACHINE TOOLS)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/ASME B5.48-1977 (LEAD SCREWS AND NUTS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 103:1999 (TRAPEZOIDAL SCREW THREADS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/lead-screw.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "9265eaeae7c1d1d4cf9af0f78b71ea3e95eb1dc90b187d5708b67791fd262ae3"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Lead Screw

## 1. Technical Definition
A threaded rod that converts rotational motion into linear motion within a linear actuator assembly.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **Axial load 0-5000 N, rotational speed 0-3000 rpm, temperature -40°C to 120°C**. Failure boundary: **Shear stress exceeds 345 MPa (yield strength of 4140 steel), thread deformation exceeds 0.1 mm permanent set, or backlash exceeds 0.05 mm**, Mechanism: **Thread shear failure due to Tresca yield criterion violation under combined torsional and axial loading, or wear-induced backlash from abrasive particle contamination exceeding 15 μm size**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Lubricant starvation causing boundary lubrication regime | 8 | Exponential wear rate increase (Archard's law) leading to 0.2 mm backlash in 1000 cycles | Integrated grease reservoir with 5 μm filtration and wear-resistant coating (DLC or TiN) on thread flanks |
| Misalignment exceeding 0.02 mm/mm over 300 mm length | 8 | Bending moment-induced thread root stress concentration (Kt=2.8) causing fatigue crack initiation at 10^5 cycles | Self-aligning nut design with spherical washers and alignment tolerance of 0.005 mm/mm |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Lathe**, **Thread Rolling Machine**, **Surface Grinder**  
**Downstream Applications**: Linear Actuators, 3D Printers, CNC Machine Tools  

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

### Q: What materials are best for lead screws in heavy machinery applications?
**A**: For heavy machinery, alloy steel offers optimal strength and wear resistance, while stainless steel provides corrosion resistance for harsh environments. Carbon steel is cost-effective for standard applications.

### Q: How do I select the right lead screw for my linear actuator assembly?
**A**: Consider load capacity, speed requirements, precision needs, and environmental conditions. The BOM components (threads, shaft body, end machining) must match your actuator's specifications for proper conversion of rotational to linear motion.

### Q: What maintenance do lead screws require in industrial equipment?
**A**: Regular lubrication, cleaning to remove debris, and inspection for thread wear or damage. Proper alignment in the actuator assembly is crucial to prevent premature failure and maintain motion accuracy.

## 6. Manufacturing Compliance
- ISO 2904:2010 (LEAD SCREWS FOR MACHINE TOOLS)
- ANSI/ASME B5.48-1977 (LEAD SCREWS AND NUTS)
- DIN 103:1999 (TRAPEZOIDAL SCREW THREADS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Lead Screw](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/lead-screw)**

### 🌐 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**: LEAD_SCREW | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: feebbb5f
