Fastening System Rail Screw Spike

Model Code

Application Scenario

Thread Specification

Key Dimensions (mm)

Compatible Sleeper Type

Matching Fastener System

Installation Torque (N·m)

Theoretical Weight (g/pc)

SS-M24×150

Urban Metro (Main Line)

M24×3 (Coarse Thread)

Shank Diameter:24; Length:150; Head Diameter:40

Pre-stressed Concrete Sleepers

SKL 12 Clip System

80–100

680

SS-M20×120

Light Rail (Tram)

M20×2.5 (Fine Thread)

Shank Diameter:20; Length:120; Head Diameter:35

Composite Sleepers

LRS Clip System

50–70

420

SS-M27×180

Heavy-Haul Freight Railway

M27×3.5 (Coarse Thread)

Shank Diameter:27; Length:180; Head Diameter:45

Anti-Corrosion Wooden Sleepers

KPO Fastener System

120–140

950

SS-M22×140

High-Speed Rail (250–300km/h)

M22×2.5 (Fine Thread)

Shank Diameter:22; Length:140; Head Diameter:38

High-Strength Concrete Sleepers

WJ-8 Clip System

90–110

580

SS-M18×110

Rural Regional Railways

M18×2 (Fine Thread)

Shank Diameter:18; Length:110; Head Diameter:32

Traditional Wooden Sleepers

Standard E-Clip System

40–60

350

Material Grade

Chemical Composition (Key Elements, Wt. %)

Mechanical Properties

Surface Treatment

Quality Inspection Items

35CrMo

C:0.32-0.40; Cr:0.80-1.10; Mo:0.15-0.25

Tensile Strength:≥930MPa; Yield Strength:≥735MPa; Hardness:HB 270-310

Zinc-Nickel Plating (10–12μm)

1. Thread Precision; 2. Tensile Strength

Q345B

C≤0.20; Mn:1.00-1.60; Si≤0.55

Tensile Strength:≥510MPa; Yield Strength:≥345MPa; Elongation:≥21%

Hot-Dip Galvanizing (≥85μm)

1. Coating Thickness; 2. Bend Test

40CrNiMoA

C:0.37-0.44; Cr:0.60-0.90; Ni:1.25-1.65; Mo:0.15-0.25

Tensile Strength:≥1080MPa; Yield Strength:≥930MPa; Impact Toughness:≥63J

Dacromet Coating (15–20μm)

1. Impact Toughness; 2. Fatigue Life

AISI 1045 (USA)

C:0.43-0.50; Mn:0.60-0.90; Si:0.17-0.37

Tensile Strength:≥620MPa; Yield Strength:≥370MPa; Hardness:HB 197-241

Black Oxide + Oil Coating

1. Surface Defects; 2. Dimensional Tolerance