KB Base Plate per GOST | Direct Manufacturer

The KB Base Plate (specifically the KB-65 or KBL-65) is a standard railway fastening component used for secure rail-to-sleeper attachment in GOST-compliant systems. Its technical specifications are primarily governed by GOST 16277-93, which defines requirements for separate rail fastenings for types R50, R65, and R75 rails.

Key Specifications for KB-65 Base Plate

Based on Prombudkoliya's specifications, standard dimensions and properties include:

• Rail Compatibility: Primarily designed for R-65 rails used in mainline and industrial tracks.

• Dimensions:

     Length: 370 mm.

     Width: 140 mm.

     Thickness: 16 mm.

• Material: Manufactured from structural carbon steel (typically St5 or similar grades) for high strength and wear resistance.

• Weight: Approximately 3.8 kg to 4.4 kg depending on the specific model variation. 

Design and Function

Fastening Type: КБseparate fastening or Clamp-Bolt fastening.

• Load Distribution: Designed to ensure uniform load distribution on the sleeper and maintain track stability under dynamic loads.

• Assembly: Typically installed as part of a system including clips, bolts, nuts, and rubber pads. 

Related Standards

• GOST 16277-2016: An updated version of the standard for separate rail fastenings.

• GOST P 51685-2022: The primary standard for the steel rails (P65, P50) that these base plates support.

• GOST 34078:2019: Applicable to specialized baseplates like the K-2 used in turnouts. 

Components of the KB-65 Fastening System

The KB-65 is part of a "terminal-bolted" assembly, meaning the rail is secured to the plate independently of the plate's attachment to the sleeper. A full assembly typically includes: 

• Rail Clamp (Klemma PK): A heavy-duty metal bracket that presses the rail foot down.

• Embedded Bolt (M22x175): Used to fix the base plate to the reinforced concrete sleeper.

• Terminal Bolt (M22x75): Used specifically to secure the rail clamp to the base plate.

• Elastic Pads: Placed under the rail and under the base plate to provide shock absorption and electrical insulation. 

Advantages and Comparisons

• Stability: Offers superior track gauge maintenance in wide-radius curves compared to newer systems like the APC anchor.

• Adjustability: Allows for rail height adjustment up to 14 mm by inserting pads beneath the plate.

• Durability: Designed for all climatic zones and high-traffic mainline tracks.

• Complexity: A disadvantage is its complexity; a KB-65 unit has 21 parts per assembly compared to just 9 in more modern boltless systems like the APC.