Stud bolts, bolts, nuts and screws
Standard and made-to-drawing fasteners in special steels, stainless steel and exotic materials: from property class 8.8 and stainless steel up to Inconel®, Hastelloy® and Monel® superalloys, in stock or made to your drawing up to 6″.
Every critical joint, one single supplier
AB&S Avvito distributes industrial fasteners and has them made by outsourced production partners, including to drawing: stud bolts and stud bolting, bolts and nuts, screws. We supply them in carbon steel, special steels, stainless steel and duplex, up to the exotic materials needed where heat, pressure and corrosion push ordinary bolting beyond its limits.
Special and standard screws
Special screws made to your drawing, including in exotic materials, plus hex head screws (TE), socket head cap screws (TCEI) and countersunk socket screws (TSPEI) from stock.
Screws →
Exotic materials and special steels
Inconel® 625 and 718, Hastelloy® C276, Monel® 400 and K500, titanium, A286, duplex F51 and super duplex F53/F55.
Materials →
Stud bolts and studs
Fully threaded stud bolts, studs threaded at both ends (double-end studs) and foundation bolts. ASTM A193 B7, B16, B8M, A320 L7. To drawing up to 6″ (150 mm).
Stud bolts →
Bolts and nuts
Hex head and 12-point bolts, ASTM A194 heavy nuts, washers: standard and special.
Bolts and nuts →
Special fasteners to drawing
Bonnet bolts for wellheads, eye bolts and valve components, including to your drawing.
Special fasteners →
Parallel keys and taper keys
Parallel keys to UNI 6604 / DIN 6885, including thin and drilled versions, and gib-head taper keys: to standard or to drawing, in steel or in Nitronic® and Alloy K500.
Parallel and taper keys →Where steel is not enough
When acids, seawater, hydrogen sulphide or turbine temperatures come into play, a different alloy is needed. We supply screws, stud bolts, bolts and nuts in exotic materials and superalloys, standard and to your drawing, with PMI identification of the material.
Certified since 1998
Our quality system has been certified since 1998 and today meets ISO 9001:2015, extended to the PED Directive 2014/68/EU. Every incoming batch goes through our in-house laboratory for PMI, hardness and tensile testing. On request, the material is supplied with a 3.1 certificate.
Where a joint cannot fail
The common thread is always the same: pressure, temperature and corrosion. For oil & gas and petrochemicals we supply flange stud bolting, bonnet bolts for wellheads and NACE-certified screws for H2S service. For energy, 12-point bolts and turbine studs in A453 660 and A437 B4B. For marine and offshore, duplex, super duplex, AISI 304 and 316 stainless steel and Monel® to withstand seawater. For aerospace, titanium, A286, Inconel® 718 and Waspaloy® to AMS specifications. We also serve the chemical, taps and valves, food, automotive and earthmoving industries, where stainless steel, property classes 10.9 and 12.9 and batch-to-batch consistency matter.
From stock or to your drawing
For urgent needs, around 40,000 items are ready for delivery. For everything else we rely on more than 200 specialised production units: heading, forging, turning, heat treatment and coatings, through to the finished, certified part.
- One single supplier for all fasteners
- Dedicated stock for 4 to 12 months, with the price fixed on the firm order
- Kanban and custom packaging labelled with your part numbers
Do you have B7 and L7 stud bolts in stock?
Yes: plain, in B7, L7, B7M, L7M, B16, B8 class 2 and B8M class 2, with the matching 2H, 2HM, 4, 7, 7M, 8 and 8M nuts. We also produce them to drawing up to 6″ (150 mm).
Do you supply fasteners in exotic materials?
Yes: Inconel® 625 and 718, Hastelloy® C276, Monel® 400 and K500, Alloy 20, A286, titanium grades 2 and 5, duplex and super duplex, with PMI identification and, if requested in the order, a 3.1 certificate.
How long have you been certified?
Since 1998. Today our quality system is certified to ISO 9001:2015, extended to the PED Directive.
Where can I find the item codes?
In the online catalogue and in the downloadable catalogues. For parts to drawing, just send us the drawing and the quantity.
A supplier you can trust
Since 1969, reliability and professionalism have defined the way we work. Our code of ethical conduct is inspired by the Universal Declaration of Human Rights, the United Nations Global Compact, the OECD Guidelines and the Women's Empowerment Principles, and we ask our whole supply chain to respect it.
- 53% of our people are women
- No to child labour and undeclared work, no to discrimination
- Zero tolerance of corruption
- Environmental management throughout the product life cycle
