Boltline 3™

Boltline 3™

Modular design - just perfect results.

The POWER »Boltline 3™« is used for the production of paver and slab systems from 300mm edge length.

Boltline 3™

The mold inserts allow for the individual walls to be joined using bolts. All inserts are completely milled and therefore have exact angularity in the cavity with a surface hardness of 68 HRC and a homogeneous hardness depth of 1.2 mm. The smallest diagonal, straightness and angularity tolerances can be achieved, which are below the limits set by German DIN and European EN standards. POWER »Boltline 3TM«   inserts can be combined with POWER »Moduline 1TM«,  POWER »Moduline 3TM« and POWER »Dynamic 1TM«   frames.

Facts & advantages:

  • Maximum mold accuracy due to internal KOBRA quality standard
  • Suitable for different insert types, such as straight or mixed layouts
  • Frame bolted and reusable
  • Smaller angularity and straightness tolerances and deviation of the edges than required in DIN 1339/1338.
  • Replaceable wear plates bolted onto the mold frame

The matching frame for any insert.

Molds with Boltline 3™.

Years ago, KOBRA was the first mold maker in the industry to revolutionize the manufacturing of concrete block molds by implementing its proprietary milling technology. We have set a new level of quality with our products.

Our experienced staff use state-of-the-art technology in a customer-oriented way to develop and manufacture your reliable tool for first-grade concrete products – for any paver or block and for any block making machine, 100% reproducible.



Curbs primarily have functional properties for their use as strict separation of areas with different vertical alignments. At the same time, they can be produced with project-specific color and format.

Hollow blocks and foundation blocks combine high stability and solidity with low weight. Fixed joints are produced, which satisfy high structural standards.

Large format concrete slabs combine modern architectural appearance and function, since they combine generously sized surface area design in conjunction with a small proportion of joints, high resilience and durability.

Particular projects require individual solutions. Do you need curbs with vertical and horizontal displacement protection, large format systems with false joints or contours in the underside of the block?

Wall and soil retention blocks can be used for multifunctional purposes and are of central importance both in private and public spaces as design and functional elements.

For perfect results

Best in precision

With the KOBRA hardness standards, extremely high hardness can be achieved and thus particularly robust and wear-resistant concrete block molds can be produced. Different hardening processes are used, depending on the mold technology, helping to achieve smooth production processes.

With this production method, KOBRA combines the advantages of state-of-the-art milling and hardening technology with the tried and tested options of flame-cutting technology. »Optiflame carbo 68 plus™« molds have flame-cut cavity contours and exactly milled base layout.

Further development of the in-house carbo hardening technology enables the surface hardness to be increased to 68 HRC.

All hardness standards labeled Optimill have milled cavity walls in the mold insert, which ensure perfect angularity in the cavity. The tolerances are smaller than +/- 0.3mm. The more exact and smooth the cavity, the more exact the block!

For specific requirements

Best in pracitcal details

The stone´s product quality can be increased by the installation of KOBRA FEATURES into the concrete block mold. Each product has its individual and special demands on the mold. In order to meet these requirements, we have developed useful features, which optimally support your production processes.

The FEATURE »Flexshoe™« is a useful compacting aid, especially for large format products and special formats. The tamper shoes are mounted on rubber supports which ensure improved compacting results and higher block surface qualities.

The »Headguide™« FEATURE ensures absolutely correct and centered installation of the overall mold in the machine and thus protects particularly sensitive mini chamfers on large-format tamper shoes.

With the »Hotshoe™« FEATURE, which consists of heatable tamper shoes and an integrated temperature control device, verifiably higher surface qualities can be achieved on the concrete block.

The single piece »Singlebolt™« plunger is the logical continuation of the KOBRA modular system.
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