Fastening Spring SKL Clip For Track

Model​

Diameter​

Material​

Hardness​

Clamping Force​

Surface Treatment​

Typical Use​

Std. Compliance​

SKL 12​

φ12mm​

50CrVA​

41–46 HRC​

6–9 kN​

Electro-galvanizing (≥25μm)​

Urban tram/light rail​

EN 13481-4, CJ/T 527​

SKL 14​

φ14mm​

60Si2MnA​

43–48 HRC​

10–14 kN​

Hot-dip galvanizing (≥85μm)​

Mainline passenger/freight​

EN 13481-3, GB/T 13489​

SKL 15​

φ16mm​

55SiMnVB​

45–50 HRC​

18–25 kN​

Dacromet + zinc plating​

Heavy-haul (mining/port)​

AREMA 10, GB/T 13489​

SKL 20​

φ15mm​

60Si2CrVA​

46–52 HRC​

15–20 kN​

Dacromet + sealant (≥10μm)​

High-speed rail (≥250km/h)​

TB/T 3562, EN 13481-2​

Inspection Item

Method

Acceptance Criteria

Sampling

Material Verification

PMI spectrometer

Match model's material (e.g., 60Si2MnA for SKL14)

3 pcs/batch

Hardness Test

Rockwell tester (HRC)

Within model's range (e.g., 43–48 HRC for SKL14)

5 pcs/batch

Dimensional Check

Digital caliper (0.01mm)

Diameter deviation ≤±0.2mm

10 pcs/batch

Surface Defects

10× magnifier + visual check

No cracks/burrs; rust ≤ Grade A

100% inspection

Clamping Force (Spot)

Force tester

≥Min. value of model (e.g., ≥10kN for SKL14)

2 pcs/batch

Packaging

Visual check

Anti-rust packaging intact; clear marking

3 packages/batch