Rail Fastening Rail SKL Clip

Model

Material

Surface Treatment

Applicable Scenario & Rail

Gauge Adjustment

Longitudinal Resistance

Matching Fasteners

Compliance Stds

SKL 12

50CrVA

Electro-galvanizing (≥25μm)

Urban Tram (30kg/m rail, Low-speed)

±4mm

≤8kN/m

M8 Bolt + Flat Washer

EN 13481-4, CJ/T 527

SKL 14

60Si2MnA

Hot-dip galvanizing (≥85μm)

Regional Freight (43–50kg/m rail)

-8～+4mm

12–18kN/m

M10 Bolt + Lock Washer

EN 13481-3, GB/T 13489

SKL 15-HD

55SiMnVB

Dacromet (≥8μm) + Zinc Plating

Heavy-Haul Mining (60–75kg/m rail)

-10～+6mm

≥20kN/m

M12 Bolt + Spring Washer

AREMA 10, GB/T 13489

SKL 20-HS

60Si2CrVA

Dacromet + Sealant (≥10μm)

High-Speed Rail (≥250km/h, 60kg/m rail)

-6～+4mm

15–22kN/m

M14 Bolt + Lock Nut

TB/T 3562, EN 13481-2

Inspection Item

Test Method

Pass/Fail Criterion

Sampling Plan

Tool/Reference

Material Authenticity

Handheld PMI (C/Si/Mn)

C: 0.56–0.64% (60Si2MnA); Si:1.50–2.00%

3 pcs/batch

Portable PMI Analyzer

Hardness & Toughness

Rockwell Tester + Impact Test

Hardness: ±2 HRC of range; Impact energy ≥80J/cm²

5 pcs/batch

Rockwell Tester, Impact Tester

Dimensional Accuracy

Digital Caliper + Gauge Block

Diameter: ±0.2mm; Tip thickness: ±0.3mm

10 pcs/batch

0.01mm Digital Caliper

Surface Defects

Visual + 10× Magnifier

No cracks/burrs; Coating peeling ≤2mm²; Rust ≤Grade A

100% Inspection

10× Magnifier, GB/T 15519

Clamping Force Stability

Dynamic Force Tester

No ≥10% loss after 1000 cycles

2 pcs/batch

Dynamic Clamping Force Tester

Packaging Integrity

Vibration Simulation

No coating damage after 1500Hz vibration

3 packages/batch

Vibration Test Bench