Pre-Embedded Sleeve

APPLICATION SCENARIOS

1. Embedded parts of tunnel segments, used for fixed connections between equipment such as external hanging channels, evacuation platforms, and cable brackets and the segments.
   
   

Product Description

High-end pre-embedded sleeves are made of 316 austenitic stainless steel via precision casting. Through the design of a double-layer insulation structure, they achieve electrical isolation performance with an insulation resistance ≥10⁸Ω. Combining a pull-out strength ≥15kN and a torsional fatigue life ≥5000 cycles, they provide lifetime maintenance-free solutions for scenarios such as rail transit and medical equipment that have stringent requirements on the insulation and mechanical reliability of metal components.

PRODUCT FUNCTION

Extreme mechanical guarantee:  

The 316 stainless steel matrix has a yield strength ≥205MPa, with pull-out bearing capacity increased by 200% (compared to 304 stainless steel).  

The special tooth groove structure enables torsional fatigue life to exceed 5,000 cycles (per EN 14399 test standard).  

Dual electrical isolation:  

Alumina ceramic insulation layer + polymer sealing ring block leakage current paths at the 10⁸Ω level.  

Dielectric strength ≥3kV/mm (per IEC 60112 wet test).  

All-environment corrosion resistance:  

316L ultra-low carbon composition resists chloride ion corrosion (passes 480-hour salt spray test ISO 9227).  

Zero structural embrittlement within the -60℃~300℃ temperature range, eliminating the risk of cold shrinkage and detachment.  

Intelligent installation compatibility:  

Internal thread precision reaches GB/T 196 Class 6H, compatible with automatic torque fastening systems.

PERFORMANCE INDEX

Core material: 316 austenitic stainless steel (Cr17/Ni12/Mo2)  

Mechanical properties:  

Pull-out force ≥15kN (per ISO 898-1)  

Torque resistance ≥35N·m  

Fatigue cycles resistance ≥5,000 cycles (load ±15°)  

Electrical properties:  

Insulation resistance ≥1×10⁸Ω (DC 500V, 23℃/50%RH)  

Dielectric strength ≥3kV/mm (AC 1min)  

Corrosion resistance grade: Grade 10 (ISO 9227 1000h salt spray test)  

Precision control: Internal thread tolerance Grade 6H (per GB/T 196)

APPLICATION AREA

High-speed rail ballastless track: Sleeper insulated anchoring system (anti-stray current corrosion)  

Medical imaging equipment: Embedded parts for magnetic shielding cabins of MRI equipment  

Precision manufacturing industry: Anti-static equipment bases in semiconductor cleanrooms  

New energy batteries: High-voltage insulated connection points of power battery packs  

Marine engineering: Chloride ion corrosion-resistant fastening systems for wharf facilities