This is rigid single-strand stainless steel wire rope specially engineered for disposable high-security cable seals, container seals, truck trailer seals, utility meter seals, logistics anti-theft locks and customs tamper-evident security seals.
Construction: 1×7 compact strand (7 fine stainless steel wires tightly twisted into one single strand)
Bare metal diameter: 0.66 mm (tolerance ±0.01 mm)
Extruded PVC coating single-side thickness: 0.13 mm
Final coated outer diameter: 0.9 mm (tolerance ±0.02 mm)
Twist direction: Right regular lay, uniform tight twist without loose filaments
Core material: AISI 304 / UNS S30400 austenitic stainless steel (18-8 stainless steel) ,201
Jacket material: UV-stabilized rigid PVC, REACH compliant non-toxic plastic
1.2 Why 1×7 Structure for Security Seals
Ultra-compact round cross-section: Perfect to pass narrow lock holes of plastic/metal seal housings without jamming
Low permanent elongation: No stretching after crimp locking, prevents slack and illegal re-tightening
High rigidity & anti-kink: Straight wire rope keeps seal tight; difficult to bend or cut secretly without obvious damage traces
Smooth round surface: No sharp wire burrs to scratch plastic seal lock bodies during assembly
Minimal internal wire gaps: Difficult to insert thin tools to pry apart strands for tampering
1.3 PVC Coating Function for Seal Usage
Isolate steel core from moisture, dust and chemical residues during long-distance transport
Color coding available (black, red, blue, green, yellow, transparent) for classified cargo management
Prevent galvanic corrosion when contacting aluminum/zinc alloy seal lock blocks
Leave visible scratch/cut marks once tampered, easy inspection for customs & logistics staff
Electrical insulation for electric meter & gas meter security seals
2. Chemical Composition of AISI 304 Stainless Steel Core (Weight %, UNS S30400)
| Element | Content Limit (wt.%) | Metallurgical Role for Seal Wire Rope |
| Carbon (C) | ≤ 0.08 | Balance tensile strength; low C avoids intergranular corrosion after cold drawing |
| Silicon (Si) | ≤ 1.00 | Smelting deoxidizer; improve surface smoothness of fine wire |
| Manganese (Mn) | ≤ 2.00 | Stabilize austenite; reduce wire brittleness during multi-pass drawing |
| Phosphorus (P) | ≤ 0.045 | Harmful impurity, strictly controlled to prevent brittle fracture under tension |
| Sulfur (S) | ≤ 0.030 | Minimize hot cracking during wire twisting & forming |
| Chromium (Cr) | 18.00 ~ 20.00 | Form self-repairing Cr₂O₃ passive film; core anti-rust property for outdoor logistics |
| Nickel (Ni) | 8.00 ~ 10.50 | Maintain full austenite structure; deliver good ductility for cutting & seal assembly |
| Iron (Fe) | Remainder | Base matrix material |
Material Feature Summary
304 stainless steel resists rust under atmospheric, freshwater and weak acid/alkali logistics environments. It will not produce rust stains on cargo boxes, trucks or container surfaces during long transport cycles. Not recommended for marine saltwater environments (select AISI 316 if used at seaports).
3. Physical & Mechanical Performance
3.1 Basic Physical Constants of 304 Stainless Steel Matrix
| Physical Index | Standard Value |
| Density | 7.93 g/cm³ |
| Melting temperature range | 1398 ℃ ~ 1454 ℃ |
| Thermal conductivity (20℃) | 12.1 W/(m·℃) |
| Linear thermal expansion coefficient (20~100℃) | 16.0 × 10⁻⁶ /℃ |
| Elastic Modulus | 193–200 GPa |
| Poisson’s Ratio | 0.27–0.30 |
3.2 Mechanical Properties of Bare 0.64 mm 1×7 Strand (For Security Seal Load Standard)
Raw single steel wire mechanical index
Minimum tensile strength of individual wire: ≥ 1770 MPa (high-strength grade for anti-cut security)
0.2% offset yield strength: ≥ 1200 MPa
Elongation: ≥ 25%
Hardness: HV 420–480
Whole strand tensile performance (core security indicator for anti-tamper)
Nominal Minimum Breaking Load (MBL): ~0.98 kN (98 kgf)
Standard working tension for sealed lock: ≤ 0.15 kN (safety factor >6)
Permanent elongation under rated working tension: ＜0.12% (critical to avoid seal loosening)
Anti-fatigue: Resist 10,000 light tension cycles without wire breakage
Anti-shear performance: Harder to cut with small pocket scissors; requires bolt cutters (obvious tamper evidence)
3.3 Composite Performance of PVC Coated Finished Rope
Dimension & weight parameters
Bare strand theoretical weight: 0.0025 kg/m
PVC coating weight: 0.0012 kg/m
Total finished coated rope weight: 0.0037 kg/m
PVC coating physical specs
PVC density: 1.4 g/cm³
Operating temperature range: -30 ℃ ~ +70 ℃
Coating adhesion: No peeling, cracking after 180° repeated bending test
UV resistance: No powdering, cracking within 3 years outdoor exposure
Environmental compliance: REACH 1907/2006, non-phthalate formula for food transport container seals
Anti-tamper composite advantages PVC layer cannot be peeled off intact; any attempt to strip plastic will leave clear visible damage, easily identified by customs inspectors.
4. Production Process Specialized for Cable Seal Wire Rope
Raw rod inspection: Chemical composition & tensile test of AISI 304 stainless steel wire rod
Multi-pass precision cold drawing: Pull rod into ultra-fine single wire with tight diameter tolerance
Surface degreasing & polishing: Eliminate drawing lubricant residue to ensure PVC coating tight adhesion
1×7 stranding: Synchronous twisting under constant low tension to guarantee round uniform strand
Low-temperature stress relief: Remove cold drawing internal stress to avoid wire spring-back during seal assembly
Online bare diameter inspection: Strict control bare OD at 0.64 mm ±0.01 mm
Continuous PVC extrusion: Uniform 0.13 mm single-side plastic jacket tightly bonded to steel core
Water cooling & traction winding
Full finished product testing: Coated OD, coating adhesion, breaking load, surface appearance, bending fatigue test
Fixed-length cutting (custom lengths 100–1000mm for seal assembly), spool packing
5. Core Advantages for Security Seal Manufacturing
Material Security Advantages
304 stainless steel anti-rust, no oxidation discoloration during cross-country/sea logistics
High tensile strength; thin diameter but high breaking force to resist forced pulling open
Non-magnetic (slight cold-drawing magnetism negligible); no interference with meter electronic components
Structural Advantages of 1×7 Strand
Compact round shape, smoothly pass through miniature seal lock holes without blockage
Low stretch property ensures locked seal maintains tight tension for months
Rigid straight shape, not easy to bend into hidden tamper loop
PVC Coating Value for Security
Color classification for batch cargo tracking & management
Tamper-evident feature: Any cut, scratch or peel can be visually detected at a glance
Anti-fouling surface, keep clean appearance for long-term container storage
Processing Compatibility Easy automatic cutting, automatic threading into seal lock bodies for mass production of disposable cable seals
6. Limitations & Operation Notes for Seal Application
Corrosion Restriction Not suitable for long-term immersion in seawater, heavy salt spray or strong acid chemical workshops; switch to AISI 316 wire rope for marine port seals.
Temperature Limit PVC coating softens above 70℃; avoid use on high-temperature cargo tank locks.
Tamper Inspection Tip If coating has cuts, scratches or peeling, the seal must be discarded and replaced, as it indicates unauthorized opening attempts.
Assembly Tip Do not strip PVC coating before crimping seal lock; complete plastic coverage maximizes tamper visibility. Only strip coating if metal terminal crimping is required.
Load Warning Designed only for disposable anti-tamper locking, NOT for cargo lifting or heavy load rigging.
7. Main Application Scenarios of Cable Seals Using This Wire Rope
●Logistics & Transportation: Shipping container seals, truck/trailer door seals, van cargo compartment locks, air freight pallet security seals
●Customs & Border Control: Customs disposable numbered anti-theft cable seals for bonded warehouse goods
●Utility Industry: Electric meter seals, water meter locks, gas pipeline valve security seals
●Finance & High-Value Goods: Cash transport box seals, jewelry cargo security locks, high-value commodity packaging seals
●Warehouse & Retail: Warehouse storage cabinet locks, logistics trolley anti-theft seals, food transport truck seals
8. Compliance & Reference Standards
Stainless steel material: ASTM A580/A580M, UNS S30400, GB/T 4356
Stainless steel wire rope manufacturing: GB/T 9944-2025, ISO 3444:2023, EN 12385-4
Breaking force test standard: ISO 3108
PVC coating environmental standard: EU REACH Regulation 1907/2006
Security seal industry standard: ISO 17712 (high security mechanical seal standard for containers)
HS Code for finished wire rope: 73121000
