JUNG & BÖRKEY - Machine Skates, Rollers and Toe Jacks
Product Search
Sales & Service

Boerkey - Machine Roller - Super Strength - Capacity 300 tons - MPN ZAS-H-Cr#5v-G

Model KZ#5v
Availability: Usually Ships Within 6 - 8 weeks
Purchase Orders Accepted with approved credit
Call Us for Emailed Quotes, Consultations, Orders, or POs
Call 1-800-786-6112
Buy online now or create a quote in cart
International Shipping Options
See Options in Cart
300 tons
7.5 inches
One roller with chain (assembled)

Quick Info

  • One machine roller (Color: Maroon)
  • Permanently loaded
  • Long distance travel
  • High safety capacity against point loading and side forces (wind)
  • Easy rolling after long standstill under load
Manufacturer: Börkey ("Boerkey"), Made in Germany

Corrosion Resistance:
  • Multiple options available (see below)
  • Super robust interlocking carbon steel frame construction
  • Hardened steel center plate
  • Hardened 50CrV4 steel load wheels
  • Channel chain guide

Applications: Machine rollers used for progressive shifting of scaffolding and shuttering in bridge construction, hangar doors, nuclear energy, ship building, tunnel construction, repositioning of structures and equipment and on oil rigs. Use also upside-down as conveyor.


Original Inventor and Manufacturer of Machine Rollers
                              Börkey Since 1945
Toolwell: Exclusive North American distributor for Boerkey 
  • US-based Sales 
  • Stocked and Shipped from the US
  • Engineering & Lifetime Technical Support


Capacity (kN)
Capacity (Tons)
Height (In)
Length (In)
Max Speed At Full Load (Ft/Min)
ZAS-H-Cr #5v-G
Total Number of Wheels
2 x 23
Weight (Lbs) - Product weight
Weight (Lbs) - Shipping weight
Wheel Diameter (In)
Wheels under stress
2 x 9
Width (In)

Börkey Color Coding

Identifying Colors:

Blue: Standard Machine Rollers (listed in hardcopy catalog, available on request).

Maroon: Machin Rollers with Hardened Center Plate (standard on this US model)


Guiding Side Casters
Optional Add-on Packages (see *Ordering Guide, **Dimensions and ***Pictures under Product Guides & Documents):


Corrosion Resistance for Outdoor Use

Galvanized load wheels, axles and links come standard.

Option Package "S" - STAINLESS
Galvanized frame, galvanized load wheels, stainless steel axles and links.

Option Package "M" - MARINE
4-layer offshore coating, galvanized load wheels, stainless steel axles and links.

Product In Use

Customer supplied - Pictures
Intro to Boerkey



Product Guides & Documents

Printable Details Printable Details
Engineering Drawings (inch) Engineering Drawings (inch)
Engineering Drawings (mm) Engineering Drawings (mm)
Mounting Holes Mounting Holes
Certification Certification
MSDS Lubricant MSDS Lubricant
MSDS Standard Frame Coating MSDS Standard Frame Coating
*Guiding Casters Order Guide *Guiding Casters Order Guide
**Guiding Casters Dimensions (inches) **Guiding Casters Dimensions (inches)
**Guiding Casters Dimensions (mm) **Guiding Casters Dimensions (mm)
Which Roller?
Roller Construction
Rolling Resistance
Weather Resistance
"Roller" vs. "Skate"
Selecting Roller Capacity
Defining Capacity
About Börkey
***Guiding Casters - Pictures


Machine Roller Information

Model Series:

  • U.S. Model Series: KZ
  • Manufacturer Part Number (MPN): ZAS-H-50CrV4
  • Manufacturer product name: Roller Skate – The Super Robusts


  • For frequent use
  • Ideal for permanently loaded loads
  • For rolling long distance
  • High safety capacity against point loading (under forward and backward rocking forces) and side forces (such as wind)
  • Easy rolling after long standstill under load
  • Double wide rollers are ideal for extra strength, higher stability, extra safety capacity against point loading


  • Bolts on for permanent attachment to load or machine
  • Model sizes # 1-3v have 4 bolt holes standard
  • Model sizes # 4-6 have 6 bolt holes standard


  • Each machine roller sold separately

Quality Level Classification:

  • Super Duty Roller (Levels: Standard | Heavy | Super | Ultra)


  • Super robust carbon steel construction with interlocking frame design
  • Hardened steel center plate
  • Super Duty 50CrV4 hardened steel load wheels
  • Channel chain guide

Corrosion Resistance:

  • Blackened load wheels plus zinc-phosphate coated frame for basic corrosion resistance
  • Additionally, galvanized load wheels, axles and links provide upgraded weather resistance
  • Further stainless steel and marine and offshore coating are available at request for upgraded weather resistance
  • See Weatherproofing Option Packages


  • LRS, ABS and DnV off-shore approved versions available on request


  • Moving heavy loads for long distances or for progressive shifting of scaffolding and shuttering in bridge construction
  • Also used for hangar doors (Hardened Shelters), as crawler tracks, in nuclear power stations, in institutes for nuclear research, on oil rigs, in the shipbuilding industry & for tunnel construction, for equipment, structures and machine repositioning
  • Rollers can be used up-side-down when the Rollers are stationary while the load moves (e.g. as a conveyor)


  • Manufactured by Börkey
  • Made in Germany

Other specs:

  • Maximum safe speed: 16 feet per minute
  • Minimum turning radius: 10 feet
  • Rolling resistance (on solid surface such as steel)
    • Sizes # 3-3v: 5-7 % of load weight
    • Sizes # 4-6: 3-5 % of load weight

Other Important Information:

  • Individual machine roller capacities are calculated based on moving the load across a steel surface (all wheels are touching the floor and the load weight is equally divided across the roller footprint). When using 4 (or more) rollers, load may rock on uneven surface, increasing load weight applied to any roller. Therefore, select suitable rated roller capacity carefully.
  • Börkey Rollers are made to run on a solid strong surface such as steel. Operating the rollers across concrete floors – especially repeatedly along the same path - may damage the floor. For best results use on suitable tracks, e.g., crane rails or steel beams.
  • The track or floor surface is vital for the safe transportation of the load, not just the carrying capacity of the Roller. Movement on tarmac and concrete is restricted, and the rollers should never be used on uncovered tile. For best results on tile, concrete, or tarmac we recommend putting a steel plate of a minimum of 0.4-inch thickness underneath.
  • Machine Rollers with larger diameter wheels will roll more easily than those with smaller wheels. Problems such as high rolling resistance on certain surface types such as concrete, or resulting floor scratching, can be avoided by choosing roller models with a larger load wheel diameter. Consequently, if moving across concrete floors, size #3 rollers (1.2 inch/30mm wheel diameter) or larger should be used.
  • Precautionary measures must be taken for use on inclines to avoid run-away loads!
  • When mixing and matching rollers (or different load supports), keep the load at same loading height. Otherwise rollers will tip and become point-loaded.

Optional packages available:

For weather proofing the chain rollers are available with the following add-on option packages:

  • Option S - Frame galvanized, Load wheels galvanized, Axles and links in stainless steel for longer-term outdoor use.
  • Option M - Frame coated with 4-layer marine & offshore coating, Load wheels galvanized, Axles and links in stainless steel for offshore and maritime use.

How Does This Chain Roller Differ From Other Börkey Models?

Every Börkey machine roller starts with a “Made-in-Germany” - interlocking solid frame design, however, each component can be upgraded to improve certain performance characteristics allowing a perfect configuration for any application.

The standard Börkey machine roller features the Solid frame construction with hardened steel load wheels. These Machine Rollers are specifically made for installation of machines & material handling where the rollers are only loaded for a short time and roll short distances. (Models KK, KN and KC).

Hardening the center plate additionally significantly improves the ease of rolling after long standstill under load. These Robust Machine Rollers are made for loads that sit longer on the dollies, roll a short distance but must roll after an extended period of inactivity such as during construction. (Models KB and KA.)

Further upgrading to the Super Robust construction provides superior strength and stability against torsion and fatigue over time under extreme loads and extreme rolling forces. Using load wheels manufactured from hardened 50CrV4 steel creates a higher safety capacity against point loading (rocking) and side forces (wind). The addition of a “channel”-type chain guide to the center plate keeps the load wheels in a track preventing wheels from scraping against the walls and prevents chain damage. These Machine Rollers are specifically made for permanent load carrying, where loads sit on these rollers for many years, must roll a long distance, and must be safe even when subjected to rocking or side forces. (Models KS and KZ.)

By adding a groove into the middle of each wheel and outfitting the center plate with a “center”-type chain guide to run inside the wheel groove wear on the wheels is completely eliminated. This allows the machine rollers to be used frequently. (Model KM)

All machine roller models have “blackened” wheels plus a zinc-phosphate coated frame to provide a durable basic level of corrosion resistance. Galvanization of wheels, axles and links improves the corrosion resistance significantly. (Models KB, KA, KS, KZ and KM). Additional options such as galvanization of frame, stainless steel components and marine & offshore coatings are available. (Models KS, KZ and KM).

Email This Page