Railway Fasteners Steel Rail Nabla Clips

Model

Material

Hardness

Surface Treatment

Clip Opening Size

Matching Sleeper Slot Spec

Applicable Rail Type

Nabla-12-LT

50CrVA

41–46 HRC

Electro-galvanizing (≥25μm)

28±1mm

30×15mm (Wooden Sleeper)

30kg/m Light Rail

Nabla-14-Main

60Si2MnA

43–48 HRC

Hot-dip galvanizing (≥90μm)

32±1mm

34×18mm (Concrete Sleeper)

50kg/m Mainline Rail

Nabla-16-HD

55SiMnVB

45–50 HRC

Dacromet (≥10μm) + Zinc Plating

36±1mm

38×20mm (Composite Sleeper)

75kg/m Heavy-Haul Rail

Nabla-15-HS

60Si2CrVA

46–52 HRC

Dacromet + Sealant (≥12μm)

34±1mm

36×17mm (High-Speed Sleeper)

60kg/m High-Speed Rail

Nabla-10-Tram

60Si2MnA

40–45 HRC

Epoxy Coating (≥60μm)

25±1mm

27×12mm (Tram Sleeper)

22kg/m Urban Tram Rail

Inspection Stage

Key Item

Test Method

Sampling Rule

Tool/Reference

Incoming Check

Material & Structure Integrity

Handheld PMI + Ultrasonic Flaw Detection

5 pcs/batch

Portable PMI Analyzer; Ultrasonic Tester

Dynamic Fatigue Test

Vibration Resistance

Servo Hydraulic Fatigue Tester

3 pcs/batch

Fatigue Tester (0–50Hz Adjustable)

Extreme Condition Test

Low-Temp Toughness & Corrosion

Low-Temp Impact Tester + Salt-Spray Chamber

2 pcs/batch

-60℃ Low-Temp Impact Tester; Salt-Spray Chamber

On-Site Installation

Slot Fit & Torque Match

Sleeper Slot Gauge + Torque Wrench

15 pcs/100m track

Precision Slot Gauge; Digital Torque Wrench

Long-Term Service

Elasticity Recovery & Wear

Compression-Recovery Tester + Thickness Gauge

4 pcs/km annually

Elasticity Tester; Magnetic Thickness Gauge