OIL & GAS

AB&S AVVITO S.r.l.: Experts in Fasteners and Fasteners for the Petrochemical Sector

AB&S AVVITO S.r.l. is a reliable and specialized partner in the production and supply of certified fasteners and fasteners for the petrochemical sector, providing accessory components for valves and oil and gas extraction and refining plants.

Thanks to our consolidated experience and the operational flexibility of AB&S AVVITO S.r.l., we are now qualified suppliers for the most important plants of the main multinationals in the sector.

Certified Fasteners according to ASTM, ASME, for the Petrochemical Sector and European Standards

Compliance with international standards is a pillar of our production. Our in-depth knowledge of ASTM and ASME standards allows us to accurately identify and supply the most suitable fasteners for the specific needs of Customers.

Our production units, specialized in different types of processing, allow us to carry out:

Standard components such as flange linkage.
Custom-made fasteners for valves, including thrust rings, plugs and keys.
Bonnet Bolts for oil wellheads, thanks to the ability to forge heavy parts.

Wide Availability of Fasteners in Stock

We have a wide selection of:

Hex head screws, Hex socket head screws and tie rods in B7/L7 and B7M/L7M materials, with relative nuts.

Industry-specific treatments and coatings, including:

Electrolytic galvanizing (ASTM B633).
Hot-dip galvanizing (HDG ASTM A153/F2329).
Electroless nickel plating – Niploy® process (ASTM B733).
Teflon-coating®, with Whitford® and Xylan® solutions for maximum protection.

Room Fasteners with Hydrogen Sulfide (H₂S)

For customers operating in environments with a high risk of corrosion, we supply screws tested with specific hardness tests, certified according to NACE regulations.

Available Materials: Steels, Alloys and Superalloys for the Petrochemical Sector

We manufacture fasteners in a wide range of certified materials, including:

High and low temperature carbon steel (A193 B7, B7M, B16 / A320 L7, L7M, L43).
Austenitic, martensitic, duplex and super duplex stainless steels.
Nickel-based alloys (exotic materials such as Hastelloy® C276, Monel® 500K, Inconel® 625 and Inconel® 718).

ISO 9001:2015 and PED Certifications for Pressure Vessels

We are ISO 9001:2015 certified with PED extension, guaranteeing the supply of fasteners that comply with the requirements of the European Directive 2014/68/EU for pressure vessels. We can certify materials according to harmonized standards EN 10269 or specific PMAs required by customers.

Quality Control Laboratory and Certifications

Our Quality Control Laboratory, equipped with modern equipment and managed by qualified technicians, performs:

Chemical analysis and mechanical tests.
Dimensional and visual non-destructive testing (NDE).
Destructive tests on penetrant liquids (LP), ultrasonics (UT), eddy currents (ET) and magnetoscopy (MT), thanks to external laboratories certified UNI CEI EN ISO/IEC 17025.

All batches supplied can be certified with documents compliant with the EN 10204 standard (2.1, 2.2 and 3.1), with the possibility of EN 10204 3.2 certification through Third Party Bodies.