August Hauerwas

Manufacturer of Grinding, Lapping, Milling and Turning machines
for all kind of sealing surfaces of valves of DN 8 - 2000 mm


Hauerwas Abrasives & Lapping Paste


Hauerwas Abrasives

Our abrasives are stamped in our company, this gives you full flexibility regarding:


- abrasive grain type (Sil.Carb., Al.Ox, Zirk.Ox., ...)

- abrasive grain sizes (coarse to fine)

- backing and bonding (paper, foil, cloth, ...)

- pick-up (self-adhesive, clampable,  ...)

- shape (Disc, Ring, Segment, any other shape, e.g. quadratic, trapezoid, ...)


- from prototype to large scale quantities


The Hauerwas abrasives are used for:

- coarse to finest grinding of sealing surfaces,

- other grinding applications,

- and for tasks beyond grinding



Hauerwas Lapping Paste

The Lapping Paste is applied to the sealing surface and to the lapping discs, and removes material of sealing surfaces while the machining disc is rotating


- boron carbide as abrasive grain is best suited due to its extreme hardness for lapping of all kinds of sealing surfaces

- available in water soluble or oil soluble design.


available as

- paste in tubes or tins 

- powder, for mixing in the workshop



Hauerwas Polishing Discs

- available for polishing of sealing surfaces in connection with diamond paste and lubrication fluid

- self-adhesive backing for sticking onto carrier or lapping discs


Hauerwas CBN Grinding Discs & Motors


Hauerwas compressed air Grinding Motors

for high speed grinding of sealing surfaces in connection with high speed grinders Hauerwas HVS


They are available for:

- Hauerwas HVS 2

- Hauerwas HVS 3

- Hauerwas HVS 4


Grinding Motors are

- solid constructed for long life

- spare parts available (replacement blades, bearings, pick-ups, ...)



Hauerwas grinding discs for high speed grinders


CBN and diamond grinding discs, for:

- face grinding

- peripheral grinding and

- taper grinding


are optimized for high speed grinding of sealing surfaces through:


- special synthetic bonding and high grit protection, resultinmg in:

- high cutting performance and a

- long life

- minimal heat production.


Shapes and diameters are available according to requirements.


Hauerwas Planet, Lapping & Milling Discs


Hauerwas Planet Discs

for DN 100 - 2000 mm


- made from aluminium,

- external diameter countinuously adjustable through swivel holders which are fitted with a high number of:

- carrier discs,

- high performance grinding discs,

- honing stones or

- lapping discs


resulting in:

- large contact area,

- reduced machining time and

- best geometry and roughness of the sealing surface



Carrier discs, made from steel, hardened and ground, to stick self-adhesive abrasives onto,

for DN 8 - 100 mm and for the planet discs



Lapping discs, to apply lapping paste on, made from cast iron, flat or with grooves for transport and even distribution of lapping paste

for DN 8 - 400 mm and for the planet discs



Milling discs, made from cast iron, equipped with milling plates

for DN 40 - 400 mm



Hauerwas Adaptors & Tilting Tables


Hauerwas Adaptors

- For grinding and lapping of sealing surfaces of valves in

your workshop in connection with stationary Boring, Turning and Milling machines.

- with pick-up according to customers requirements, such as MK, Sk, ...


- 4 Adaptors for working ranges:

DN 8 - 1250 mm


- Adaptors equipped with continuously adjustable axial spring suspended spindle with scale for indication of spring pressure



Hauerwas Ball Mandrels

- Ball Mandrels with attached or separate carriers are mounted to the spindle of the Hauerwas Machines or Adaptors and align machining discs to the sealing surfaces.



Hauerwas Tilting Tables

- Table surface sizes from 380 x 255, to 600 x 600,

max. clamping Ø with extensions 1000 mm, max. load 3000 kg


- to be used as additional table for the stationary Hauerwas machines or as tilting table for setting up of valve casings when using the Hauerwas Adaptors


- Inclination of tilting table surface by hand wheel, optical scale for setup and control


- T-slots for clamping of valve casings


Further dimensions and options (corner extensions, chucks, ...) according to customers requirements upon request


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© Maschinenfabrik A. Hauerwas GmbH & Co. KG, Kölner Landstr. 299, 52351 Düren, Germany, Tel.: +49 2421 34103, Fax.: +49 2421 38141, E-Mail: