KB Baseplate per GOST | Direct Manufacturer

The KB-65 baseplate (also known as a rail tie plate or lining) is a critical component of railway fastening systems used to secure R-65 rails to reinforced concrete sleepers. Its production and technical specifications are primarily governed by the interstate standard GOST 16277-2016 (which replaced the older GOST 16277-93). 

Technical Specifications

The KB-65 baseplate typically adheres to these parameters: 

• Length: 370 mm

• Width: 140 mm

• Thickness: 16 mm

• Weight: Approximately 3.8 kg

• Material: Structural carbon steel 

Functional Features

• Split Fastening: Designed for "split" (separate) fastening systems where the rail is clamped to the plate independently of the plate's attachment to the sleeper.

• Hole Configuration: Features four holes—two for terminal bolts (M22x75) to secure the rail and two for anchor bolts (M22x175) to secure the plate to the sleeper.

• Inclination: Provides a standard rail seat cant (inward tilt) to ensure proper track geometry and load distribution.

• Durability: Manufactured via hot rolling or stamping and often treated with anti-corrosion coatings to withstand varied climates. 

Dimensional Tolerances

For a standard KB-65 baseplate (nominal dimensions: 370 x 140 mm), the following deviations are typically permitted: 

• Length: ± 5.0 mm

• Width: ± 3.0 mm

• Thickness: ± 1.0 mm (standard 16 mm thickness)

• Weight: Max deviation of ± 3-5% from the theoretical weight of 3.85 kg. 

Hole Positioning and Geometry

Precision in hole placement is critical for the alignment of terminal and anchor bolts:

• Distance between bolt holes: ± 1.0 mm

• Hole Diameter: +1.0 mm / -0.5 mm

• Perpendicularity: The axis of the holes should not deviate from the vertical by more than 1 mm.

Surface and Shape Quality

• Flatness (Base Surface): The longitudinal curvature (bowing) should not exceed 1.5 mm over the entire length of the plate.

• Transverse Flatness: Deviation from the plane across the width must not exceed 0.8 mm.

• Rail Seat Cant: The standard inclination (usually 1:20) must be maintained within a tolerance of ± 0.5 degrees to ensure correct rail positioning.

• Surface Finish: The surface must be free from cracks, deep pits, or rolling defects that exceed the specified depth (usually 1.5 mm). Sharp edges and burrs must be removed to prevent stress concentration.

Material and Hardness

• Steel Grade: Typically structural carbon steel.

• Hardness: Must meet the minimum requirements specified in the GOST 16277 technical conditions for structural integrity under dynamic loads.