Railway SKL Clips
|
Application Scenario |
Model |
(Applicable Rail) |
Material |
Key Performance |
Surface Treatment |
Install Tool |
|
Urban Light Rail |
SKL 12 |
22–30kg/m Light Rail |
50CrVA |
Hardness: 41–46 HRCClamping Force: 6–9 kN |
Electro-galvanizing |
Light Pneumatic Tool |
|
Mainline Freight/Passenger |
SKL 14 |
43–60kg/m UIC 54/UIC 60 |
60Si2MnA |
Hardness: 43–48 HRCClamping Force: 10–14 kN |
Hot-dip Galvanizing |
Standard Pneumatic Inserter |
|
Heavy-Haul (Mining/Port) |
SKL 15 |
60–75kg/m Heavy-Haul Rail |
55SiMnVB |
Hardness: 45–50 HRCClamping Force: 18–25 kN |
Dacromet + Zinc Plating |
Hydraulic Tool |
|
High-Speed Rail (≥250km/h) |
SKL 20 |
60kg/m High-Speed Rail |
60Si2CrVA |
Hardness: 46–52 HRCClamping Force: 15–20 kN |
Dacromet + Sealant |
Precision Electric Tool |
Rapid Inspection Checklist for Railway SKL Clips
|
Inspection Item |
Quick Check Method |
Pass/Fail Criterion |
Sampling Ratio |
|
Material Consistency |
Handheld PMI (3 key elements: C/Si/Mn) |
Match model's material (e.g., C:0.56–0.64% for 60Si2MnA) |
2 pcs/batch |
|
Hardness (Spot Check) |
Portable Rockwell Tester |
1-point test; within model's HRC range (no deviation ≥2 HRC) |
3 pcs/batch |
|
Surface Quality |
Visual Check (no magnifier) |
No visible cracks/burrs; no rust spots >5mm² |
100% (random scan) |
|
Clamping Force (Spot) |
Simplified Force Gauge |
≥80% of model's min. clamping force (e.g., ≥8kN for SKL14) |
1 pc/batch |
|
Packaging & Marking |
Visual Check |
Packaging intact; marking (model/batch) legible |
2 packages/batch |
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