Grade 4.8 Hollow Lead Screw External Threaded Hollow Rod For Construction Electronic
Product Overview
External threaded hollow lead screws designed for aluminum-steel connections in construction electronics. These full-threaded hollow rods combine structural integrity with functional integration through their unique hollow channel design.
Product Definition & Core Structure
This product is a Hollow Full-Threaded Rod (also known as Full-Threaded Hollow Lead Screw or Hollow External Threaded Rod), featuring a comprehensive "full external thread wrapping + hollow through-channel" design:
- External Threads: High-precision threads machined along the entire length, enabling full-section compatibility with nuts and internally threaded connectors for adjustable positioning
- Hollow Channel: Internal through-cavity supports cable routing or weight-reduction design, achieving dual value of "structural connection + functional integration"
Technical Parameters & Performance Specifications
| Key Parameters |
Technical Analysis |
| Material System |
Stainless steel 304/316 (main choices), carbon steel (galvanized)
- 304/316: Resistant to acids, alkalis, and salt spray (salt spray test ≥ 100 hours), suitable for food, chemical, and marine applications
- Galvanized carbon steel: Cost-effective, very suitable for dry environments (salt spray test ≥ 48 hours)
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| Thread Specification |
Pipe threads (G1/8"-G2", NPT1/4"-NPT1"), metric threads (M8-M36)
- Pipe threads: G is a parallel pipe thread (requiring a sealant); NPT is a tapered pipe thread (self-sealing, suitable for high pressure)
- Metric threads: Designed specifically for mechanical structure connections, with a thread tolerance class of 6g
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| Customizable Dimensions |
Length: L = 10-100mm (standard: 15/20/25mm); Outer diameter: D matches the thread (e.g., G1/2" outer diameter ≈ 20.95mm); Inner diameter: d = D - 2*wall thickness (wall thickness: 2-5mm)
The hollow inner diameter can be customized (e.g., larger diameter for cable threading), and wall thickness ensures tensile strength (≥ 200MPa)
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| Surface Treatment |
Stainless steel mirror polishing (Ra ≤ 1.6μm), carbon steel with blue-white galvanizing/colored zinc plating
Enhances corrosion resistance and aesthetics. Stainless steel can be customized through passivation, nickel plating, or other special treatments
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Application Scenarios & Value Proposition
Mechanical Equipment Field
- Automation equipment supports: Full threads match nuts for stepless height adjustment (e.g., assembly line support columns with hollow channels for air hoses/signals)
- Vibration mechanical connections: Full-thread engagement resists vibration (e.g., mining/textile machinery), replacing welding for easy disassembly
Electrical Engineering Field
- Cabinet cable routing: Hollow channels route cables; external threads secure to cabinet panels (e.g., PLC cabinets, sensor bases), integrating connection and wiring
- Lighting systems: Hollow rods suspend fixtures, with internal channels for power cables and external threads for height adjustment (e.g., mall chandeliers, industrial lighting)
Differentiated Competitive Advantages
- Dual Attributes: "Full Thread + Hollow" - Full threads enable full-section adjustable connections (e.g., stepless height adjustment). The hollow design integrates functional channels (reducing external piping), weighing 30%-50% less than solid rods
- Multi-Standard Compatibility - Supports dual systems: metric threads (structural connection) + pipe threads (fluid connection). Materials range from economical (carbon steel) to high-end (316L), covering civil, industrial, and military applications
- Thread Precision Guarantee - Utilizes thread rolling process for uniform threads. Pitch deviation ≤±0.02mm, with 100% go/no-go gauge inspection, ensuring compatibility with imported/domestic threads and preventing stripping
Selection & Installation Guide
Three-Step Selection Method
- Thread Priority: Choose between M/G/NPT. Tapered NPT suits high-pressure scenarios; parallel G/M require seals
- Material Decision: For humid/corrosive environments, choose 304/316 stainless steel; for dry environments, zinc-plated carbon steel (cost reduction ≥30%)
- Length Customization: Standard lengths: 20~100mm. Custom lengths available (≤500mm for extra-long, ≥10mm for extra-short)
Installation Tips
- Sealing: For fluids, use PTFE tape (≥5 wraps) or Loctite 577; structural connections can be screwed directly
- Torque Control: For M16, recommended torque: 30-40N*m. For pipe threads, tighten 1/4 turn after hand-tightening
- Anti-Loosening: For vibration, use slotted nuts (GB6178) + cotter pins or Loctite 243
Customization & Quality Assurance
- Customization: Supports reducing adapters (e.g., G1/2" to M20) and variable wall thickness design (local thickening for strength)
- Quality: Each batch is inspected to agreed standards. Third-party inspection is supported