---
title: "HST - CEM - Deformation units"
canonical: "/hst-cem-deformation-units"
published: 2026-09-21
---

# HST - CEM - Deformation units

## Frame

## Frame

**Crash boxes**

**Rail**

**HST**

**CEM**

**Deformation units**

**Regenerative center**

**Override protection**

## Frame

### Extrusion Bolts

###### DEFORMATION UNITS

##### Extrusion Bolts

##### Extrusion Bolts – Cold Drawn Bars (CDB)

##### Extrusion Bolts (Cold Drawn Bars) are used in Crash Energy Management system as permanent deformation elements. They absorb kinetic energy during collisions, protecting the train structure.

**Customer benefits**

### Deformation tube

###### DEFORMATION UNITS

##### Deformation tube

##### Deformation tube behind pivot anchor

##### A deformation tube behind the pivot anchor is an energy-absorbing component used in train coupler systems that combines the functionality of a spherical rubber bearing (draft gear) and a deformation tube. This compact element enhances Crash Energy Management by improving impact absorption while maintaining the coupler’s alignment and operational demands.

**Customer benefits**

### Deformation unit

###### DEFORMATION UNITS

##### Deformation unit

##### Deformation unit

##### Deformation units are designed to absorb kinetic energy during a crash. They help protect the car body structure by reducing impact forces.

**Customer benefits**

**Extrusion Bolts**

**Deformation tube**

**Deformation unit**

## Frame