Self-tapping screw 4.2×32 AISI 316 domed - code: a4-7981-04.2×032 – Osculati

Osculati self-tapping screw in AISI 316 for ordered fixings on board

The Osculati self-tapping screw in AISI 316 stainless steel is a practical solution for hardware and onboard system interventions where a clean, reliable fixing consistent with the existing small parts is needed. This item is identified by the supplier code a4-7981-04.2×032 and is commonly searched also through the references UNI 6954 / DIN 7981 indicated by the manufacturer, useful for reorders, replacements, and standardization of components in the workshop or on site.

The size is 4,2×32. The head is indicated as pan head in the product name; for operations where a flush finish or a cleaner support is desired, it is always good practice to check the head geometry based on the seat and the accessory to be fixed. In the nautical field, choosing a suitable stainless steel and a correctly sized screw helps maintain order and consistency in installations, especially when working on existing components.

Product features and details

Material: stainless steel AISI 316

The product is made of AISI 316, a typical choice for applications in marine environments and in the presence of humidity, where resistant materials suitable for use on boats and onboard systems are preferred. The use of quality stainless steel is particularly useful when the small parts remain exposed or when uniformity with other already installed fixings is desired.

Type: self-tapping screw

Being a self-tapping screw, is designed for mounting and maintenance operations on suitable supports, with a quick and neat installation. In many applications, the self-tapping screw is chosen to simplify installation and reduce steps, while the correct preparation of the support (for example with a pilot hole when necessary) remains fundamental for a clean result.

Size and identification

• Size: 4,2×32
• Supplier product code: a4-7981-04.2×032
• Indicated regulatory references: UNI 6954 / DIN 7981
• Brand / supplier: Osculati S.r.l.

The references UNI 6954 and DIN 7981 are particularly useful when managing small parts stocks or when replacing an existing screw while maintaining the same standard. In technical contexts (nautical, systems, maintenance), being able to relate an item to a recognized reference simplifies procurement and reduces the risk of dimensional incompatibilities.

Typical applications in nautical and plant engineering

This screw is suitable for numerous activities of maintenance and installation where stainless steel small hardware and neat installation are required. In the nautical field, it is often used for fastenings on components and accessories that require a compact screw size and easy catalog availability.

Examples of use (generic)

• Onboard hardware: fastening of small accessories and components on suitable supports.
• Plant engineering: light brackets, cable glands, supports, and finishing small hardware (depending on the support material).
• Restoration interventions: replacement of existing screws maintaining standards and coding for future reorders.

For specific applications (special materials, thicknesses, vibration-prone areas), it is advisable to evaluate the screw choice and hole preparation according to the support and the type of expected load, without forcing the tightening.

Usage and installation notes

To achieve a neat result and reduce the risk of damaging the support or the screw, it is advisable to follow some general good practices, adapting them to the material being worked on:

• Evaluate the pilot hole when appropriate, especially on materials that may crack or on stiffer supports.
• Controlled tightening: avoid forcing beyond what is necessary; excessive tightening can damage the seat or compromise the fastening hold.
• Proper tool: use the correct and well-maintained drive to avoid damaging the screw head.
• Support compatibility: check that the material and thickness are suitable for a self-tapping screw of the indicated size.
• Final check: after installation, check the alignment of the component and the absence of unwanted play.

In case of replacing existing screws, it can be useful to directly compare the removed screw with the new one, also referring to UNI 6954 / DIN 7981 and to Osculati code a4-7981-04.2×032 to maintain continuity of standards and availability.

FAQ – Frequently Asked Questions

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

The screw is made of AISI 316 stainless steel, recommended by the manufacturer for the item in question.

What is the size of this screw?

The size shown is 4.2×32.

What is the Osculati supplier code for reordering?

The indicated supplier code is a4-7981-04.2×032.

To which regulatory references is it associated?

The manufacturer associates it with the UNI 6954 and DIN 7981 references, useful for identification and standardization of small parts.

Is the pre-hole needed for installation?

It depends on the material and the application support. In general, it is advisable to consider pre-drilling when appropriate and proceed with controlled tightening for a neat fastening.