Osculati A2 AISI 304 Stainless Steel Large Diameter Flat Washers, 3× Nominal Diameter, M3–M16

ID 1403714

$ 7.15

1-2 weeks delivery time

Diameter, mm:

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10 pcs
25 pcs
50 pcs
100 pcs
200 pcs

Osculati large diameter flat washers are manufactured from A2 (AISI 304) stainless steel and feature a wide, flat circular design with an outer diameter three times the nominal fastener size. Their enlarged bearing surface helps distribute clamping loads over a wider area than standard flat washers, making them suitable for mounting panels, brackets, fittings and components where additional surface support is required. The range includes nine sizes for metric fasteners from M3 to M16, with catalogue dimensions from 3x9 mm to 16x48 mm. Supplied in cardboard boxes containing 10 to 200 washers, depending on the selected size.

Description
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Osculati A2 AISI 304 Stainless Steel Large Diameter Flat Washers - 3x Nominal Diameter

Osculati large diameter flat washers are manufactured from A2 (AISI 304) stainless steel and feature an enlarged circular profile designed to distribute fastening loads over a wider contact area. The manufacturer identifies this range as "Washer x 3 nominal diameter".

The washers have an outer diameter three times the nominal fastener diameter. For example, the M4 size is listed as 4x12 mm, while the M8 size is listed as 8x24 mm. This larger bearing surface is particularly useful when fastening components that benefit from greater support beneath a bolt head or nut.

Compared with standard flat washers, the larger outside diameter helps spread the clamping force over a wider area of the mounted component. It can also help reduce localized surface pressure when used with appropriately selected fasteners.

These washers are suitable for use with compatible metric bolts, machine screws and threaded rods. They may be installed beneath a screw or bolt head, or between a nut and the mounting surface, depending on the assembly requirements.

The plain, flat design does not incorporate a dedicated locking or sealing mechanism. These washers should not be treated as substitutes for spring washers, serrated lock washers or sealing washers when such functions are required.

A2 (AISI 304) stainless steel offers corrosion resistance for general indoor, outdoor and suitable marine applications. For prolonged saltwater exposure or environments with high chloride concentrations, the suitability of the material should be assessed.

The range includes nine dimensional variants, corresponding to nominal metric fastener sizes from M3 to M16. Each version has an individual Osculati part number and is supplied in a cardboard box containing 10, 25, 50, 100 or 200 washers.

Technical Specifications

Brand	Osculati
Product Type	Large Diameter Flat Washer
Material	A2 / AISI 304 Stainless Steel
Design	Flat Circular Washer
Outer Diameter	3x Nominal Fastener Diameter
Nominal Sizes	M3, M4, M5, M6, M8, M10, M12, M14, M16
Catalogue Size Range	3x9 to 16x48 mm
Box Quantities	10, 25, 50, 100, 200 pcs
Packaging	Cardboard Box
Number of Variants	9

Features and Applications

Manufactured from A2 (AISI 304) stainless steel.
Large diameter flat washer with an outer diameter three times the nominal fastener size.
Wide bearing surface helps distribute clamping loads.
Suitable for appropriate mounting panels, brackets, equipment fittings and general fastening assemblies.
Can be installed beneath compatible bolt heads, screw heads or nuts.
Flat design without a dedicated locking or sealing mechanism.
Available in nine nominal sizes from M3 to M16.
Supplied in cardboard boxes containing 10 to 200 washers.

Available Sizes and Part Numbers

Nominal Size	Catalogue Dimensions	Box Quantity	Osculati Part No.
M3	3x9 mm	200 pcs	A2-9021A-03X009
M4	4x12 mm	200 pcs	A2-9021A-04X012
M5	5x15 mm	200 pcs	A2-9021A-05X015
M6	6x18 mm	100 pcs	A2-9021A-06X018
M8	8x24 mm	50 pcs	A2-9021A-08X024
M10	10x30 mm	25 pcs	A2-9021A-10X030
M12	12x36 mm	25 pcs	A2-9021A-12X036
M14	14x42 mm	10 pcs	A2-9021A-14X042
M16	16x48 mm	10 pcs	A2-9021A-16X048

Size Selection

Select the nominal washer size according to the diameter of the bolt, screw or threaded rod being used. The first number in the catalogue dimensions identifies the nominal fastener size, while the second number indicates the enlarged outside diameter of the washer.

For example, the 6x18 mm variant is intended for nominal M6 fasteners and has an outside diameter of 18 mm. The nominal size should not be interpreted as the exact internal hole diameter.

Exact inner hole dimensions, washer thicknesses and dimensional tolerances are not specified in the supplied catalogue information.