Auto tc 4.8×50 aisi 316 domed – code: a4-7981-04.8×050 – Osculati

Osculati self-tapping screw in AISI 316 for fastenings in nautical contexts

The Auto tc 4.8×50 AISI 316 domed Osculati (code a4-7981-04.8×050) is a self-tapping screw designed for installation, maintenance, and replacement of screws on onboard accessories and components. The choice of’AISI 316 stainless steel makes it a solution typically adopted in nautical contexts and in systems engineering where fasteners suitable for exposed environments and demanding operating conditions are sought.

This version is offered in the size 4,8×50 and belongs to the family of self-tapping screws referenced as DIN 7981 and UNI 6954 (as indicated in the source sheet). It is recommended when a practical and neat fastening is desired, with attention to the correct selection of length and preparation of the screwing point according to the material and component to be installed.

Product features and details

Material: stainless steel AISI 316

The screw body is made of AISI 316, a common choice for nautical and onboard applications. During design or maintenance, the use of stainless steel screws is often preferred for their suitability in humid environments and for continuity with other metal components present on the boat or in the system.

Type: self-tapping screw

Being a self-tapping screw, is designed to create its own thread in the support material during screwing. This feature makes it practical for many installations on panels, accessories, and hardware, especially when working on replacements or restorations where quick and controllable assembly is useful.

Format and identification

• Size: 4,8×50
• Product code: a4-7981-04.8×050
• Brand / supplier: Osculati S.r.l.
• Indicated regulatory references: DIN 7981, UNI 6954

For orderly spare parts management, the Osculati code allows precise identification of the correct variant during reorder or outfitting.

Typical applications in nautical and onboard systems

This self-tapping screw in AISI 316 is suitable for many onboard operations where stainless steel hardware is used to fasten components and accessories. In particular, it can be used in contexts such as:

• Installation of accessories on surfaces and paneling, when a self-tapping screw is required.
• Maintenance and replacement of existing screws on components subject to periodic disassembly.
• Fastenings on technical furniture elements and internal/external finishes, where stainless steel screws consistent with the usage environment are desired.
• Interventions on onboard systems (supports, cable glands, light brackets), always evaluating the support material and the correct preparation of the fastening point.

The choice of size 4.8×50 is useful when a length adequate to the bundle of materials to be crossed and the type of grip required is needed. In case of doubt, it is good practice to compare the screw with the one removed or check the overall thickness of the components to be fastened.

Usage and assembly notes

Check of the seat and support material

Before installation, it is advisable to check:

• Material on which it screws (panel, support, accessory) and its condition (integrity, any damaged threads or ovalized holes).
• Alignment of the components to be fastened, to avoid tension or forced assemblies.
• Head compatibility with the intended seat (especially if the component requires a specific drive or dedicated support).

Preparation of the fastening point

For a clean and controlled assembly, hole preparation (when required) and the correct choice of length are determining factors. In the nautical field, where work is often done on different and layered materials, it is useful to proceed carefully to avoid damage to the support or component.

Spare parts management: codes and identification

For reorders and scheduled maintenance, it is recommended to note:

• Osculati Code: a4-7981-04.8×050
• Size: 4,8×50
• Family/standard: DIN 7981 / UNI 6954

This information facilitates replacement with the same type of screw, avoiding unwanted variations in head, geometry, or intended use.

FAQ – Frequently Asked Questions

What is the material of the Osculati self-tapping screw?

The screw is made of AISI 316 stainless steel, a typical choice for nautical applications and onboard plant engineering.

What is the size of this version?

This variant is size 4.8×50, as indicated in the product title and associated code.

What is the Osculati product code for this screw?

The code shown is a4-7981-04.8×050, useful for identification and reorder.

Are there regulatory references indicated for this screw?

Yes. The source sheet lists the DIN 7981 and UNI 6954 references.

For what uses is it suitable in the nautical field?

It is suitable for installations, maintenance, and replacement of screws on onboard accessories and components, always considering the support material and correct preparation of the fastening point.