ESS is a leading supplier of speciality metals ranging from low alloys to stainless steels and high nickel alloys in the form of bar, forgings, hollow bored bar, pipe & tubing. The company has earned a reputation as a metal management supplier of complex materials used in the oil and gas industry for drilling, completions and production.  ESS provides distribution and processing services which include heat treatment, testing and semi-finished machining including trepanning, drilling and boring. Given recent difficult market conditions, our goal is to be highly competitive offering 'total cost' supply solutions aimed at taking cost out through ‘net form’ supply.


Our extensive stock is specifically selected to meet international quality standards and global industry requirements. Typical base stock range includes, the following alloy grades, nickel and superalloys purchased to global standards such as API 5CT, API 6A and API 7.



Stock ranges from 1″ to 20″ – 25mm to 510mm diameter


Special Alloy Steels


AISI 4140

AISI 4145

AISI 4330



Stainless Steels and Super Duplex


AISI 410

AISI 420

Super 13% CR

17/4 ST ST

UNS 31803 F51

UNS 32760 F55

316 Stainless




L80 Tube

P110 Tube

Q125 Tube


Nickel Alloys (in accordance with API 6ACRA’s)








Alloy 500 / BS 3076 NA 18


Downhole Products


Choosing the right supply partner is essential, ESS overcomes the difficulties that stand in the way of success. We are still a developing company despite being established for over 25 years.  We make it our business to learn as much as we can about your business, that way, we are able to help mirror supply against your forecast supply demands. We do this intelligently, with information which lets our teams work better together to support your end market. Working closely, we invest and innovate with one objective in mind – to focus our energies on growing your revenues. We have the ability to introduce material solutions and offer valuable expertise in providing an extensive range of semi-finished downhole products. A typical range of OEM products includes:-


Polished Bore Receptacles

Gas Lift Mandrels

Side Pocket Mandrels

Internal Mandrels

Drilling Jars

Pup Joints

X-Over and Saver Subs

Valve Stems


ESS + Ancon brings a strong combination of products, service and capability to a wide spectrum of the global Oil & Gas industry making it a powerful single source of supply.



Ancon is a leading domestic and international supplier of special alloys for the oil & gas wellhead, subsea systems, drilling equipment and pressure control equipment. The company has earned a reputation for exceeding expectations in terms of quality, service and safety. Meeting the Complex Challenges of Critical Subsea and Wellhead Applications. Whether it is deepwater and ultra-deepwater, well integrity in high pressure / high temperature (HP/HT) presents unique challenges. Whether you’re looking to reduce lead times, improve reliability or quality, Ancon will combine its global experience and knowledge to provide cost effective solutions. Whatever the challenge and wherever we are in the world, our customers will benefit from our expertise and extensive processing facilities that enables us to deliver alloy and nickel alloy products which include:- 
Forged Bar – 10” (254mm) to 47” Diameter (1200mm)
Rolled Bar – 1” to 12” Diameter (305mm)
Forged / Rolled Rings – up to 65” Diameter (1650mm)
Forged Blanks, Blocks, Shaped Forgings
Semi-Finished Components
We continue to invest in people, processes and capacity with one aim in mind – to maintain our position as a safe and trusted supplier to some of the most demanding oil equipment manufacturers in the world. Our extensive stock of special alloy steels and high nickel alloys is specifically selected to meet the global requirements of the oil and gas industry.
Our typical base stock range includes the following alloy grades:- 

Special Alloy Steels

AISI 4130
AISI 4140
AISI 8630 Mod
ASTM A182 F22
ASTM A182 F22 (Modified)
AISI 4340 / 817M40 / EN24

Stainless Steels and Super Duplex

AISI 410
UNS 31803 – F51
UNS 32760 – F55
316 Stainless
Nickel Alloys (in accordance with API 6ACRA’s)

Alloy 500 / BS 3076 NA 18


As part of Ancon's service commitment, we provide extensive processing capabilities which include:
Heat Treatment
Mechanical Testing UKAS Accredited
Semi-finished Machining
Trepanning ; Drilling ; Boring
In-House Level II NDT inspectors
Hardness inspection supported by brintronic computerised brinell microscope
3rd party inspection facilitated and managed

Subsea Components

As a global product supplier we have considerable experience in providing a wide range of alloy bar, forgings, tubulars, shaped products and semi-finished components, all used for applications requiring superior corrosion resistance and strength.  Typical OEM systems and products include:-

Fluid control —from wellheads to flowback and well testing
Subsea production system — including subsea trees and completion system
Flexible risers
Production flowline
Gas injection line
Topside control systems
Tubing Hangers
Casing Hangers
Gas injection line
Bore Protectors
Valve Blocks

Ancon + ESS brings a strong combination of products, service and capability to a wide spectrum of the global Oil & Gas industry making it a powerful single source of supply.

Health, Safety & Environmental (HSE) and Quality Assurance


Our mission is to deliver world-class, industry leading value, service and quality, underpinned by stringent health, safety and environmental standards. 

Third party inspection and independent accreditations bodies provide a constant monitoring of quality and control so that we can adjust our capabilities to meet changing conditions and ensure product integrity.

Continually striving to exceed industry expectations on quality and service complying to ISO 9001 and continuous improvement principles


Engineering Special Steels (ESS) – ISO 9001 (LRQA) 0928260

Ancon Special Alloy Steels (Ancon) – ISO 9001 (LRQA) 0928260

ISO 9001.jpg

Non-Destructive Testing

Engineering Special Steels (ESS) – ASNT NDE Level I, II & PCN Level II

Ancon Special Alloy Steels (Ancon) – ASNT NDE Level I, II & PCN Level II




We are pleased to announce that AMS Group has now completed a transaction to purchase Gabbro Precision’s Materials Division. With immediate effect the business will trade under its traditional name of ESS Ancon Limited. 

It’s very much business as usual except we will be improving our product offering with increased stocks of traditional alloys and greater access to nickel alloy products.

Email addresses, phones, systems and paperwork have all been updated to reflect ESS Ancon and will be forwarded onto as the established domain name which will be used by everyone as their assigned email address.

ESS Ancon will be relocating to customised facilities in the South Yorkshire area over the next year. 

There are many other positive benefits which we will be happy to discuss in due course, but for now we are concentrating on cost efficiencies, operational effectiveness and supply chain improvements. 

We would like to thank all our valued customers for their continued support as we go through this brief transition period.

Contact ESS Ancon

Name *

Phone: +44 (0) 114 261 9988