Wide washer aisi 316 5×15 – code: a4-9021a-05×015 – Osculati

Wide washer in AISI 316 stainless steel Osculati (5×15) – for fastenings with a wider bearing surface

The wide flat washer Osculati in AISI 316 stainless steel is a small hardware component designed for fastenings where it is useful to increase the contact surface between screw/nut and the material being worked on. Compared to a standard washer, the “wide” version helps to achieve a larger support area, with a neat assembly and a more even distribution of tightening.

It is a typical choice in the field of nautical and plant engineering, where stainless steel screws are often used and where attention to assembly details (alignment, finish, bearing stability) makes a difference in maintenance and outfitting. The product is identified by the Osculati code a4-9021a-05×015 and is described as wide washer 5×15.

Product features and details

Material: stainless steel AISI 316

Made of AISI 316, this washer is suitable for applications where it is preferred to use stainless steel components, particularly in typical nautical and onboard plant engineering contexts. Using a stainless steel washer allows maintaining consistency with screws, nuts, and accessories of the same material, contributing to a clean and technically correct assembly.

Type: “wide” flat washer”

The geometry flat and the version wide they are designed to:

• increase the bearing surface under the screw head or nut;
• reduce the risk of marking or locally compressing the support, especially on more delicate materials or painted surfaces;
• improve bearing stability in the presence of slots, oversized holes, or seats that are not perfectly planar.

Identification and codes

• Supplier: Osculati S.r.l.
• Supplier product code: a4-9021a-05×015
• Commercial description: wide washer 5×15

During reordering or spare parts management, refer to the Osculati code helps maintain consistency between components and reduce procurement errors.

Dimensions: 5×15

The product is indicated as 5×15. Before purchase and assembly, it is advisable to check dimensional compatibility with your own screws and the installation seat (hole, slot, thickness, and available clearances). In case of doubt, compare the washer with a sample already in use or with the specifications of the intended fastening.

Typical applications (nautical and plant engineering)

This wide washer in AISI 316 is suitable for many mounting and maintenance situations where a wider support and a neat finish are desired. Some common usage examples:

• Onboard fitting and maintenance: fastenings on brackets, supports, and small assemblies where better distribution of tightening is useful.
• Plant engineering: assemblies on panels, supports, and components where the washer helps stabilize the screw support.
• Hardware for accessories: installation of accessories with stainless steel screws and nuts, when a larger contact surface than a standard washer is desired.
• Repairs and replacements: as a spare part in overhaul interventions, when you want to maintain the same type of small parts (wide flat stainless steel washer).

The wide washer is often chosen also when the support has a reduced contact area or when you want to improve the aesthetics of the fastening, achieving a more “full” and even support.

Usage and installation notes

Dimensional check before assembly

Before installing the washer, check:

• that the inner hole is compatible with the intended screw;
• that the outer diameter does not interfere with edges, seats, or adjacent components;
• that the support surface is clean and sufficiently flat for neat tightening.

Matching with screw and nut

For consistent assembly, it is advisable to pair the washer with stainless steel screws and nuts and choose the type of washer (wide flat) based on the support and the fastening objective. When delicate materials or finished surfaces are present, the washer can help preserve the component's appearance by reducing localized marks caused by tightening.

General guidelines for maintenance and spare parts

In maintenance, replacing small parts with equivalent components (same type and size) helps keep the assembly compliant with the original installation. For this item, refer to the code a4-9021a-05×015 and the description wide washer 5×15 to correctly identify the spare part.

Note

Washers are simple but essential components: choosing the correct type (standard or wide) based on the support and available space contributes to a cleaner and more functional assembly. In case of doubts about compatibility, it is preferable to perform a dimensional check before the final installation.

FAQ – Frequently Asked Questions

What is a wide flat washer and what is it used for?

It is a flat washer with a larger bearing surface compared to a standard washer. It is used in fastenings to increase the contact area under the screw head or nut and achieve a neater assembly.

What material is this Osculati washer made of?

The washer is made of AISI 316 stainless steel.

What is the Osculati product code for this washer?

The supplier product code is a4-9021a-05×015.

What does the 5×15 size indicated in the description mean?

The washer is described as “5×15”. Before assembly, it is advisable to check dimensional compatibility with the screw used and the installation seat.

In which contexts is it typically used?

It is commonly used in the nautical and plant engineering fields, for example in maintenance and onboard outfitting, on brackets, supports, and assemblies where a more stable bearing is desired.