Last Update September 14, 2018


  • Electrical, Electronics & Electro-optics
  • Maintenance Repair Overhaul and Logistics Support
  • Mechanical, Electro-mechanical, Hydraulic and Pneumatic components

SIELMAN S.A., is a high technology company dedicated to the design, manufacturing of military spare parts and maintenance of military equipment. Founded by Theo Efremides in the city of Volos in 1982; SIELMAN S.A. has been offering high quality services to NATO, USA, Hellenic Army, Air Force and Navy during the last 25 years. Has an area of 120000 sq. m. at the Industrial area of Volos, equipped with state-of-the-art equipment and innovative production methods insuring the highest value for its customers.

SIELMAN S.A. is active in the following technological areas, each one forming a separate company division.


Quality Assurance: SIELMAN S.A. has established a Quality Control System ISO 9002 and AQAP 4, with the aim to ensure conformity of services and/or supplies with the contractual requirements.


  • Track shoe pads,
  • Precision hydraulic parts for tanks and armored vehicles,
  • Oil pumps for tanks,
  • Mechanical seals for final drive of tanks,
  • Bullet proof observation windows,
  • Machine gun mounts,
  • Precision casting and machining,
  • Aircraft brakes,
  • Hydraulic devices,
  • Hydraulic parts for Launcher,
  • Structural items,
  • Radar and shop mechanical items,
  • Various cyclotron support parts,
  • Vision blocks,
  • Friction disks for tanks,
  • Friction pads for Leopard braking system,
  • A7-H Corsair aircraft brake heat pack,
  • CL-215 Canadair aircraft heat pack,
  • F-4 Phantom aircraft brake heat pack,
  • Mirage F-1 aircraft break heat pack,
  • Generators for Hummer vehicle for US Army,
  • Cable assy, interconn box 10180884 for Hawk,
  • Maintenance for 5th Echelon in group II and group III,
  • Electronic circuit cards,
  • Voltage regulators. 


  • NAMSA/HAWK (Hawk Spares),
  • NAMSA/M60/M113 (Spares),
  • U.S. Department of Defense (Generators 200A. Vision Blocks),
  • Greek Army (Spares),
  • Greek Airforce (Aircraft Brakes),
  • Greek MoD (Reverse Engineering Projects),
  • C.E.R.N. (European Nuclear Research).

Sielman S.A.

  • , Volos, Greece
  • +30 24210 95118 
  • +30 24210 95083 
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