Manufacture of cylindrical and tapered pins to standard and drawing, as well as precision draw parts, in Lennestadt.
GREMAKO GmbH & Co. KG
Lennestadt (Grevenbrück)New on Amplifa
About GREMAKO
GREMAKO GmbH & Co. KG is a manufacturer of cylindrical pins, tapered pins and draw parts to standard and customer drawing, founded in 1960 in Grevenbrück (Lennestadt). Production includes turning of diameters 1–30 mm and lengths 3–150 mm, through-feed centerless grinding, surface and vibratory grinding with surface finishes of Rz < 2, and diameter tolerances from 0.005 mm. Materials machined include free-cutting steels, quenched and tempered steels and case-hardening steels as well as stainless steels such as 1.4034, 1.4305 and 1.4401; in addition, the company offers heat treatments (hardening, tempering, case hardening and induction hardening, salt-bath and gas nitriding) and surface treatments such as black oxidizing, phosphating, zinc plating, nickel plating, zinc-nickel and hard chrome plating. In 2010 the company produced approximately 200 million pins per year with around 60 employees and, by its own account, maintains the largest warehouse for cylindrical and tapered pins. Customers are primarily the automotive industry and mechanical engineering; deliveries are made to Europe, the USA, Canada, South America and Asia.
- Site
- Lennestadt
- Processes
- Turning (draw parts), Centerless through-feed grinding, Surface grinding, Vibratory grinding, Hardening, Tempering, Case hardening, Induction hardening
- Materials
- hardened steel, Free-cutting steel, 1.4034, 1.4305, 1.4401, Quenched and tempered steels, Case-hardening steels, Free-cutting steels
- Certificates
- DIN EN ISO 9001:2015, IATF 16949:2016, Fine cleaning VDA Volume 19 / ISO 16232, First article sampling to VDA / PPAP
- Founded
- 1960
- Industries
- Automotive, Mechanical engineering, General industry, Automotive (IATF 16949)
- 01
Turning
- 02
Centerless grinding / surface grinding
- 03
Heat treatment
- 04
Surface treatment
- 05
Fine cleaning
- 06
Inspection
- 07
Warehousing & shipping
Materials & Processes
Free-cutting steels
Machining steels for pins and draw parts; since 2022 conversion to lead-free variants (11SMn30).
11SMnPb30
Lead-containing free-cutting steel, gradually being replaced by lead-free alternatives (REACH/RoHS).
11SMn30
Lead-free free-cutting steel alternative for the warehouse and special range.
Quenched and tempered steels
For quenched and tempered draw parts with increased strength requirements.
Case-hardening steels
For case-hardened components with hard surfaces and a tough core.
1.4034 (stainless steel, hardened)
Hardened stainless material for cylindrical pins to DIN 6325 and ISO 8734/8735.
1.4305
Stainless free-cutting steel for cylindrical and tapered pins.
1.4401
Stainless material for cylindrical pins with increased corrosion resistance.
Centerless grinding
Through-feed process with roughness values of Rz < 2 and diameter tolerances from 0.005 mm.
Heat treatment
Hardening, tempering, case hardening, induction hardening, salt-bath nitriding (Tenifer) and gas nitriding.
Surface treatment
Black oxidizing, phosphating, zinc plating, nickel plating, zinc-nickel, hard chrome plating, electroless nickel plating, Delta Seal/Tone.
Locations
Lennestadt (Grevenbrück)
DEHeadquarters, production, warehouse, shipping
- Part weight / size
- Ø 1–30 mm · Length 3–150 mm
- Materials
- Free-cutting steels, quenched and tempered/case-hardening steels, stainless steels 1.4034/1.4305/1.4401
- Lathes
- Centerless grinding machines
- Surface grinding machines
- Vibratory finishing systems
- Heat treatment
- Fine cleaning
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Turning (draw parts)Machining | Diameter from 0.005 mm; length from 0.1 mm | 150 mm | – | – | Quenched and tempered steels, Case-hardening steels, Free-cutting steels, Stainless steels |
| Centerless through-feed grindingMachining | Diameter from 0.005 mm · Rz < 2 | 150 mm | – | – | Quenched and tempered steels, Case-hardening steels, Free-cutting steels, Stainless steels |
| Surface grindingMachining | Rz < 2 | – | – | – | Quenched and tempered steels, Case-hardening steels, Free-cutting steels, Stainless steels |
| Vibratory grindingSurface | – | – | – | – | Steel |
| HardeningHeat treatment | – | – | – | – | hardened steel, 1.4034 |
| TemperingHeat treatment | – | – | – | – | Quenched and tempered steels |
| Case hardeningHeat treatment | – | – | – | – | Case-hardening steels |
| Induction hardeningHeat treatment | – | – | – | – | Steel |
| Salt-bath nitriding (Tenifer)Heat treatment | – | – | – | – | Steel |
| Gas nitridingHeat treatment | – | – | – | – | Steel |
| Black oxidizingSurface | – | – | – | – | Steel |
| PhosphatingSurface | – | – | – | – | Steel |
| Zinc platingSurface | – | – | – | – | Steel |
| Nickel platingSurface | – | – | – | – | Steel |
| Zinc-nickel coatingSurface | – | – | – | – | Steel |
| Hard chrome platingSurface | – | – | – | – | Steel |
| Electroless nickel plating, Delta Seal, Delta ToneSurface | – | – | – | – | Steel |
| Fine cleaning to VDA Volume 19 and ISO 16232Surface | – | – | – | – | Steel |
| Hardness testing (HRC, HB, HV from 1), case hardness testing, roughness and crack testing, 100%Inspection | Diameter from 0.005 mm | – | – | – | – |
| Manufacture of cylindrical pins to DIN 6325, ISO 8734, DIN 7, ISO 2338, DIN 7979, ISO 8735 (ØMachining | m6, m5, h6, h8 | 150 mm | – | – | hardened steel, Free-cutting steel, 1.4034, 1.4305, 1.4401 |
| Manufacture of tapered pins to DIN 1, DIN 7978 (ISO 8736A), DIN 258, DIN 7977 (ISO 8737) (Ø 2-25Machining | – | 120 mm | – | – | Free-cutting steel, 1.4305, hardened steel |
Additional services
Quality
Production is certified to IATF 16949:2016 and DIN EN ISO 9001:2015. Inspection services include hardness testing (HRC, HB, HV from 1), case hardness, roughness and crack testing, 100 percent length and diameter inspection, as well as first article sampling to VDA and PPAP.
| Evidence | Lennestadt (Grevenbrück) |
|---|---|
| DIN EN ISO 9001:2015 | |
| IATF 16949:2016 | |
| Fine cleaning VDA Volume 19 / ISO 16232 | |
| First article sampling to VDA / PPAP |
History
- 1960
Founding of Gregory & Maackens KG (Gremako) by Albert Gregory and Herbert Maackens in Grevenbrück; manufacture of precision machine parts
- 1963
Death of Albert Gregory; Herbert Maackens takes over sole management
- 1972
Renamed Gregory & Maackens GmbH & Co. KG
- 1978
Kurt Nötges and Berthold Knappstein take over management
- 1985
Liesel and Dr. habil. Manfred Effler join the company
- 1986
Dr. habil. Manfred Effler becomes managing partner
- 1996
New construction of a hall for finished-goods warehouse, packing room, shipping and materials warehouse
- 1997
Certification to DIN EN ISO 9001:2000 and VDA 6.1
- 2003
Transfer of company shares from Elsbeth and Herbert Maackens to Liesel Effler
- 2004
Sonja Vollmert (née Effler) joins the company (fourth generation)
- 2008
Sonja Vollmert becomes managing director, Andreas Vollmert joins the management; construction of another production hall
- 2010
50th anniversary; approx. 60 employees, production of around 200 million pins per year
- 2015
Renamed GREMAKO GmbH & Co. KG; Sonja and Andreas Vollmert take over sole management
- 2016
Certification to ISO/TS 16949
- 2018
Certification to IATF 16949
- 2018
Cooperation with the Werthmann Werkstätten for sorting work
- 2021
Introduction of a new ERP system
- 2022
Conversion to lead-free free-cutting steel materials (REACH/RoHS)