As a contract manufacturer in steel fabrication we supply crane and lifting technology with load-bearing heavy-duty structures — crane bridges, crane girders, lifting beams, trolleys and rope drums up to 50 t part weight and 26 m in length, SAW-welded and finish-machined to DIN EN 1090-2 EXC3 in Lorch in the Stuttgart region.
Heavy crane components up to 50 t part weight and 26 m in length — handled safely by the crane system with 25 t.
Load-bearing crane bridges, crane girders and lifting beams in S355 and high-strength fine-grain structural steel up to S1100.
Long load-bearing longitudinal seams are welded by the submerged arc process — uniform, documented and low in residual stress.
Drum bodies for rope and hose guidance — vertical turning up to Ø 4,800 mm in diameter in-house.
Lattice structures and boom components for mobile and gantry cranes — welded and machined on several faces.
Load-bearing welded structures to EXC3, the highest execution class certified in practice — plus EN ISO 3834-2.
Steel fabrication for crane manufacturing has to do more than carry load: crane bridges and crane girders are under constantly changing loads, every weld is built for fatigue strength, every hole pattern has to fit exactly over long distances. As a certified welding contractor we manufacture load-bearing crane components to your drawing — built for load capacity, dimensional accuracy and repeat accuracy in series as well as in single parts.
The long load-bearing seams on crane girders and crane bridges are welded by the submerged arc process: high deposition rate, uniform bead appearance and complete documentation over the full component length. We then straighten the structures and machine hole patterns, connection and functional faces on our gantry milling machines up to 26 m.
From the flame-cut blank through welding and CNC machining to shot blasting and industrial painting, everything is produced under one roof in Lorch in the Stuttgart region. That shortens lead times, avoids transport risks with heavy-duty components and secures complete material traceability to EN 10204.
If your component lies within these limits we manufacture it completely in-house — from the SAW-welded crane girder to the turned rope drum, ready to install and corrosion-protected ex works Lorch.
To drawing and customer specification we manufacture, among others:
Load-bearing bridge structures for overhead travelling and gantry cranes — SAW-welded, straightened and prepared for assembly.
Heavy-duty load-bearing elements in S355 and fine-grain structural steel — welded, straightened and with precisely fitting hole patterns.
Frames for hoisting and travelling gear as ready-to-install welded assemblies with machined functional faces.
Turned and welded drum bodies for rope and hose guidance — vertical turning up to Ø 4,800 mm.
Lattice structures and boom components for mobile cranes — welded and machined on large-part machining centres.
We manufacture further crane components to drawing — simply send us your documents.
For crane manufacturing we mainly process structural steel S235/S355 and high-strength fine-grain structural steel up to S1100 — from a stock of over 40 material grades, with a 3.1 mill certificate to EN 10204, from our own warehouse and cut to size.
Long crane girders are SAW-welded, straightened and then machined — hole patterns, connection and functional faces on our gantry milling machines up to 26 m in length; welding and machining interlock without interface losses.
The surface finishes the job: shot blasting and industrial painting to EN ISO 12944 in-house, so that load-bearing crane components reach assembly corrosion-protected.
Materials at a glance
Crane girders and crane bridges depend on the quality of their longitudinal seams. For these we rely on submerged arc welding systems — and inspect the seams in-house afterwards.
Long longitudinal seams on crane girders
Submerged arc welding with a high deposition rate — uniform, reproducible bead appearance over the full component length.
Web-to-flange welds on heavy-duty girders
Thick sections in fine-grain structural steel
Multi-pass SAW seams in fine-grain structural steel up to S1100 — with a matched welding sequence against distortion.
Flange plates on lifting beams
Verifiable seam quality for EXC3
Welded to EN ISO 3834-2, inspected with MT by our own Level 2 inspectors in-house and with UT at our plant by our cooperation partner — including documentation for your verification records.
Load-bearing butt and fillet welds
After welding and machining we protect load-bearing crane components against corrosion in-house:
Shot blasting and coating to EN ISO 12944 in our own paint booth — reliable corrosion protection for load-bearing crane components.
Learn more
Shot-blasted and painted, load-bearing crane components leave the Lorch plant ready to install and corrosion-protected.
Learn moreA crane girder passes through many steps — cutting, SAW welding, straightening, machining, testing, blasting, painting. Spread across several companies, this costs time, traceability and clear responsibility at every interface. With us it all stays under one roof.
| Step in crane manufacturing | Distributed outsourcing | Bock — everything in-house One point of contact Recommended |
|---|---|---|
| Long load-bearing longitudinal seams | External welding shop | SAW welding to EN ISO 3834-2 |
| Turning rope drums & rings | Commission a turning shop | Vertical turning up to Ø 4,800 mm |
| Seam inspection for EXC3 | External testing institute | NDT Level 2 (VT/PT/MT) in-house, UT via our cooperation partner |
| Finish-machining girders | Contract machining shop | Gantry milling up to 26 m |
| Corrosion protection | External paint shop | Blasting + painting EN ISO 12944 |
| Heavy-load handling & loading | Freight forwarder logistics | 25 t + heavy-duty forklifts |
Load-bearing crane components are manufactured to DIN EN 1090-2 EXC3 — the highest execution class certified in practice — and welded to EN ISO 3834-2 with comprehensive quality requirements. Every batch remains completely traceable via the material marking to EN 10204.
Dynamically loaded welds require reliable inspection evidence:
Inspection scope and documentation are agreed to your specification — from the welding record to the 3.1 mill certificate.
Yes. We manufacture crane bridges, crane girders, trolleys and lifting beams to your drawing in S355 and high-strength fine-grain structural steel — welded and machined to DIN EN 1090-2 EXC3, the highest execution class certified in practice.
Up to 50 t part weight and 26 m component length. Handling is carried out by our crane system with 25 t; machining takes place on gantry milling machines in the same format.
Predominantly structural steel S355 and high-strength fine-grain structural steel up to S1100 — with a 3.1 mill certificate to EN 10204 from our own stock, flame-cut up to 200 mm plate thickness.
By visual, dye penetrant and magnetic particle testing (VT/PT/MT) carried out in-house by our own Level 2 inspectors to DIN EN ISO 9712; ultrasonic testing (UT) is carried out at our plant by our cooperation partner — documented for your EXC3 verification records.
Yes. From the single component to the ready-to-install welded assembly we manufacture crane girders, trolleys, trolley frames and lifting beams — welded, straightened, machined and, on request, blasted and painted.
Yes. Drum bodies for rope and hose guidance as well as large rings are turned on our vertical lathe up to Ø 4,800 mm in diameter and welded into the finished assembly — turning and welding interlock without outsourcing.
Yes. Manufacturing takes place in Lorch in the Stuttgart region; we supply crane manufacturers and plant builders throughout Germany and the DACH region. Heavy components are loaded by the crane system and heavy-duty forklifts up to 16 t.
Send us your drawings for crane bridges, crane girders, lifting beams or rope drums — we will assess feasibility, material availability and lead time and provide a no-obligation quote.
Certified to DIN EN 1090-2 EXC3 · 3.1 mill certificate to EN 10204.
