Special screws to drawing
In Turin since 1969, we have been supplying hex head screws (TE), socket head cap screws (TCEI) and countersunk socket screws (TSPEI) from our warehouse, and we produce special screws to drawing, including in exotic materials: cold-headed or hot-forged, forged or turned.
Screws in exotic materials
TE and TCEI screws and screws to drawing in superalloys and nickel alloys, for environments where steel is not enough: acids, seawater, hydrogen sulphide, high temperatures. The material is verified by positive material identification (PMI).
| Alloy | Standard and designation |
|---|---|
| Inconel® 718 | ASTM B637 · UNS N07718 |
| Inconel® 625 | UNS N06625 |
| Hastelloy® C276 | ASTM F468 · UNS N10276 |
| Monel® 400 · K500 | ASTM F468 · UNS N04400, N05500 |
| Titanium Gr. 2 · Gr. 5 | ASTM F468 |
| A286 | ASTM A453 Gr. 660 |
| Duplex · super duplex | F51, F53, F55 |
TE and TCEI screws, fully threaded
- Metric TE UNI 5739 / DIN 933 / UNI EN ISO 4017 · inch ASME B18.2.1, regular and heavy series
- Metric TCEI UNI 5931 / DIN 912 / ISO 4762 · inch ASME B18.3
- On request, partially threaded or with other head types, such as 12-point (double hex)
In stock in plain finish, from M6 to M24 / 1″, in ASTM A193 Gr. B7 / B7M, B8 and B8M (cl. 1 and cl. 2) and A320 Gr. L7 / L7M. We cut them to length from longer screws, also for small and medium batches, and after a thick coating the threads are re-chased so that screw and nut mate correctly.
| Production | Range |
|---|---|
| Cold heading | from M5/M6 – 1/4″ up to M22 – 7/8″, for large batches |
| Hot forging | up to M100 / 4″, also for small batches and special materials |
Materials: ASTM A193 / A320 B7, B7M, L7, L7M, B16, B8, B8M, B8R · A453 Gr. 660 · F468 (Hastelloy®, Monel®, titanium) · B637 Inconel® · EN 10269 · duplex and super duplex · ASTM A437 B4B. Compliant with ISO 15156 (formerly NACE MR0175) and ISO 17945 (formerly NACE MR0103) for H₂S service.
For industry, construction and structures
- Machine screws, self-tapping, self-drilling and thread-forming screws
- Chipboard screws and screws for structural steelwork
- TTQST (carriage) bolts, set screws, spring clips and threaded inserts
Carbon steel, ISO 898-1 property classes 8.8, 10.9, 12.9.
Stainless steel AISI 304 A2 and AISI 316 A4, ISO 3506-1.
Coatings on request: zinc plating, zinc-nickel, nickel and silver electroplating, Niploy® electroless nickel plating, hot-dip galvanizing (HDG), phosphating, Xylan®, zinc flake coating (Geomet®).
To your drawing, with the right technology
Standard DIN, UNI and ISO screws and screws to drawing, including to ITN tables and ASME standards, produced with Italian and international partners.
Cold heading
Multi-station machines for large volumes; custom head, recess and thread (metric, self-tapping, for plastics, thread-forming); quenching and tempering, case hardening, electroplated coatings, sorting down to defect rates of a few PPM, captive washers.
Hot forging
For larger diameters or smaller batches, with pickling and passivation.
Oil & gas forging
Large screws for drilling and wellheads (bonnet bolts), with mechanical testing on sacrificial samples and certified non-destructive testing.
Turning and milling
Screws with O-ring grooves or ground shanks, also in small batches.
Materials
Carbon and alloy steels, AISI 304 and 316 stainless steel, duplex, super duplex and exotic alloys.
Bonnet bolts and eye bolts
Bonnet bolts, eye bolts and valve components are covered on the Special fasteners to drawing page.
Do you produce special screws to drawing for oil & gas?
Yes: TE and TCEI screws in ASTM A193 B7, B7M, B16 and A320 L7, L7M, screws for H₂S service (ISO 15156, formerly NACE MR0175) and large forged screws for drilling and wellheads, also in Inconel®, Hastelloy® and Monel®.
Do you have B7 and L7 screws in stock?
Yes: fully threaded TE and TCEI screws in plain finish, from M6 up to M24 / 1″, in ASTM A193 B7 / B7M and A320 L7 / L7M.
What size range do you cover for screws to drawing?
Cold-headed screws range from M5/M6 to M22 – 7/8″, for large batches; hot-forged screws go up to M100 / 4″. For drilling and wellheads we also supply large forged screws.
Do you produce screws in Inconel®, Hastelloy® or Monel®?
Yes: TE and TCEI screws and screws to drawing in Inconel® 718 (ASTM B637) and 625, Hastelloy® C276, Monel® 400 and K500 and titanium (ASTM F468), A286 (ASTM A453 Gr. 660), duplex and super duplex.
Do you have screws for H₂S service?
Yes, compliant with ISO 15156 (formerly NACE MR0175) and ISO 17945 (formerly NACE MR0103).
Where are you located in Turin?
We are at Strada del Francese 93, 10156 Turin, where we have a 2,500 m² warehouse with around 40,000 items ready for urgent orders. Telephone +39 011 47 03 103.