Railway Nabla Clips
|
Model |
Diameter |
Material |
Hardness |
Clamping Force |
Clamping Method |
Surface Treatment |
Applicable Rail & Scene |
Matching Fastener Kit |
Fatigue Life (Min.) |
Compliance Stds |
|
Nabla-S12 |
φ12mm |
50CrVA |
41–46 HRC |
8–11 kN |
Bolt-Tightened |
Electro-galvanizing (≥25μm) |
30kg/m Light Rail (Urban Tram) |
M8 Bolt + Flat Washer |
1.5×10⁶ Cycles |
EN 13481-5, CJ/T 527 |
|
Nabla-M14 |
φ14mm |
60Si2MnA |
43–48 HRC |
12–15 kN |
Bolt-Tightened |
Hot-dip galvanizing (≥90μm) |
50kg/m Mainline (Regional Freight) |
M10 Bolt + Lock Washer |
2.2×10⁶ Cycles |
EN 13481-3, GB/T 13489 |
|
Nabla-HD18 |
φ18mm |
55SiMnVB |
45–50 HRC |
22–28 kN |
Wedge-Assisted |
Dacromet (≥10μm) + Zinc Plating |
75kg/m Heavy-Haul (Mining) |
M12 Bolt + Spring Washer |
3.8×10⁶ Cycles |
AREMA 11, GB/T 13489 |
|
Nabla-HS16 |
φ16mm |
60Si2CrVA |
46–52 HRC |
18–23 kN |
Bolt-Tightened |
Dacromet + Sealant (≥12μm) |
60kg/m High-Speed Rail (-35℃ Zone) |
M14 Bolt + Lock Nut |
5.2×10⁶ Cycles |
TB/T 3395.3-2015, EN 13481-2 |
|
Nabla-T10 |
φ10mm |
60Si2MnA |
40–45 HRC |
7–9 kN |
Bolt-Tightened |
Epoxy Coating + Oil |
22kg/m Metro (Humid Tunnel) |
M6 Bolt + Flat Washer |
1.2×10⁶ Cycles |
TB/T 3395.1-2015, CJ/T 527 |
Structure & Compatibility-Focused Inspection Checklist
|
Management Stage |
Key Item |
Test/Operation Method |
Acceptance Criterion |
Sampling/Execution Rule |
Tool/Reference |
|
Incoming Inspection |
Material & Structure Integrity |
Handheld PMI + Ultrasonic Flaw Detection |
C: 0.56–0.65% (60Si2MnA); No Internal Cracks (≥φ0.5mm) |
3 pcs/batch; 5 pcs/batch |
Portable PMI Analyzer; Ultrasonic Tester |
|
Installation |
Compatibility & Torque |
Mock Installation + Torque Wrench |
Fits Rail Slot Without Gap (>0.3mm); Torque (M10: 48–62N·m, M12: 68–78N·m) |
15 pcs/100m track |
Rail Slot Gauge; Precision Torque Wrench |
|
In-Service Check |
Clamping Force & Deformation |
Dynamic Force Tester + Dial Gauge |
Force Loss ≤6% After 7×10⁵ Cycles; Permanent Deformation ≤0.2mm |
3 pcs/km quarterly |
Dynamic Force Tester; Dial Gauge (0.01mm) |
|
Maintenance |
Fastener Match & Wear |
Visual Inspection + Thickness Gauge |
Matching Fasteners No Rust/Deformation; Coating Wear ≤8% |
100% of Dismantled Clips |
10× Magnifier; Magnetic Thickness Gauge |
|
Batch Audit |
Dimensional Precision |
Coordinate Measuring Machine (CMM) |
Diameter/Thickness Deviation ≤±0.12mm; Slot Fit Tolerance ≤±0.15mm |
2% of Batch (Min. 3 Pcs) |
CMM (Accuracy: ±0.005mm) |
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