Custom hydraulic cylinders: design, manufacturing and assembly in small, medium and large series since 1985.
Germa GmbH
RenningenNew on Amplifa
About Germa GmbH
Germa GmbH, based in Renningen near Stuttgart, specialises in custom hydraulic cylinders for mechanical engineering, mould making, toolmaking, jig and fixture construction and plant engineering. Founded in 1965 and owner-managed in the third generation, the company has been manufacturing cylinders since the mid-1980s and, in addition to custom special cylinders, offers a standard programme to factory standards: block cylinders, hollow piston cylinders, screw-in cylinders, built-in cylinders, spring tension cylinders as well as accessories such as pressure pads and groove nuts. The entire value chain, from design through machining on automated turning and milling cells to assembly, takes place in the company's own production. Block cylinders achieve operating pressures up to 500 bar, piston diameters from 25 to 125 mm, strokes up to 100 mm and forces up to 614 kN; NBR and FKM are available as seal variants. On request, Germa handles call-off orders including stockpiling of components and seals as well as the supply of spare and wear parts. Data sheets and CAD data (STEP) are available for all standard products.
- Site
- Renningen
- Processes
- Design of custom hydraulic cylinders (special cylinders), Cylinder manufacturing (special and series cylinders, small/medium/large series), Assembly of hydraulic cylinders (incl. seals, Heli-Coil inserts), Turning (automated turning cells), Milling (automated milling cells), Roller burnishing of cylinder bores, Case hardening of piston rods, Grinding of piston rods
- Materials
- Steel alloys (cylinder/piston rods, housings), Tie rod strength class 8.8, NBR (acrylonitrile-butadiene rubber, seals), FKM (fluoro rubber, seals), PUR (polyurethane, seals), PTFE compounds (seals), Hydraulic oil HLP 46 (mineral oil basis according to DIN 51524/51525), Steel alloys
- Certificates
- Recognised training company
- Founded
- 1965
- Industries
- Mechanical engineering, Mould making, Toolmaking, Jig and fixture construction, Plant engineering
- 01
Design
- 02
CNC turning (automated turning cell)
- 03
CNC milling (automated milling cell)
- 04
Roller burnishing of the cylinder bore
- 05
Heat treatment (case hardening or induction hardening)
- 06
Grinding of piston rods
- 07
Surface treatment (chrome plating, burnishing)
- 08
Assembly including seals
- 09
Delivery
Materials & Processes
Steel alloys
Material for cylinder housings, piston rods and tie rods (tie rods strength class 8.8).
NBR (acrylonitrile-butadiene rubber)
Seal material for standard applications from -20 °C to +100 °C.
FKM (fluoro rubber)
Seal material for higher temperature requirements from -15 °C to +180 °C.
PUR (polyurethane)
Material of the factory-installed seals.
PTFE compounds
Seal material for high tightness across all pressure ranges.
Hydraulic oil HLP 46
Recommended operating medium on mineral oil basis according to DIN 51524/51525.
Locations
Renningen
DEHeadquarters, design, manufacturing and assembly
- Lot size
- Small, medium and large series
- Materials
- Steel alloys, NBR, FKM, PUR, PTFE
- Automated turning cell
- Automated milling cell
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Design of custom hydraulic cylinders (special cylinders)Engineering | – | – | – | – | Steel |
| Cylinder manufacturing (special and series cylinders, small/medium/large series)Joining | – | Stroke up to 100mm | – | Small series – Large series | Steel |
| Assembly of hydraulic cylinders (incl. seals, Heli-Coil inserts)Assembly | – | – | – | – | Steel, NBR, FKM, PUR, PTFE compounds |
| Turning (automated turning cells)Machining | – | – | – | – | Steel |
| Milling (automated milling cells)Machining | – | – | – | – | Steel |
| Roller burnishing of cylinder boresForming | – | – | – | – | Steel |
| Case hardening of piston rodsHeat treatment | – | – | – | – | Steel |
| Grinding of piston rodsMachining | – | – | – | – | Steel |
| Induction hardening of piston rods (on customer request)Heat treatment | – | – | – | – | Steel |
| Chrome plating of piston rods (on customer request)Surface | – | – | – | – | Steel |
| Burnishing of housing and screwed connectionsSurface | – | – | – | – | Steel |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Automated turning cell | – | – | – | – | Renningen |
| Automated milling cell | – | – | – | – | Renningen |
Additional services
Quality
The cylinders are manufactured with roller-burnished cylinder bores, screwed connections secured against unintentional loosening and application-oriented sealing systems; data sheets and CAD data are available for all standard products.
| Evidence | Renningen |
|---|---|
| Recognised training company |
History
- 1965
Foundation of the company, on the market ever since and owner-managed in the third generation.
- 1985
Start of cylinder manufacturing; over 40 years of experience in cylinder construction since then.