Osculati A2 AISI 304 Stainless Steel Extra Large Flat Washers, 4× Nominal Diameter, M3–M16

ID 1403724

$ 7.30

1-2 weeks delivery time

Diameter, mm:

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5 pcs
10 pcs
25 pcs
50 pcs
100 pcs

Osculati A2-9021B extra large flat washers are manufactured from A2 (AISI 304) stainless steel and feature an enlarged circular bearing surface with an outer diameter four times the nominal fastener size. These washers help distribute clamping loads over a wider area beneath bolt heads and nuts, making them suitable for mounting panels, brackets, fittings and components requiring additional surface support. The range includes nine variants for nominal metric fastener sizes from M3 to M16, with catalogue dimensions from 3x12 mm to 16x64 mm. Supplied in cardboard boxes containing 5 to 100 washers, depending on the selected size.

Description
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Osculati A2 AISI 304 Stainless Steel Extra Large Flat Washers - 4x Nominal Diameter

Osculati A2-9021B extra large flat washers are manufactured from A2 (AISI 304) stainless steel and feature a wide, flat circular profile for distributing fastening loads over an increased surface area. The manufacturer identifies this series as "Washer x 4 nominal diameter".

Each washer has an outside diameter four times its nominal fastener size. For example, the washer for an M6 fastener is listed as 6x24 mm, while the version for M10 is listed as 10x40 mm. The enlarged outside diameter provides a wider bearing surface than standard flat washers.

When installed beneath a bolt head, machine screw head or nut, the washer helps distribute clamping pressure across a larger area of the mounted material. This can be particularly useful for panels, brackets, equipment fittings and other assemblies where additional surface support is desirable.

Compared with the Osculati A2-9021A series, which has an outside diameter three times the nominal fastener size, the A2-9021B series offers a wider profile with an outside diameter four times the nominal size.

The flat washer 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 those functions are required.

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

The series includes nine dimensional configurations for nominal metric fasteners from M3 to M16. Each size has an individual Osculati part number and is supplied in a cardboard box containing 5, 10, 25, 50 or 100 washers, depending on the selected variant.

Technical Specifications

Brand	Osculati
Product Series	A2-9021B
Product Type	Extra Large Diameter Flat Washer
Material	A2 / AISI 304 Stainless Steel
Design	Flat Circular Washer
Outside Diameter	4x Nominal Fastener Diameter
Nominal Sizes	M3, M4, M5, M6, M8, M10, M12, M14, M16
Catalogue Size Range	3x12 to 16x64 mm
Box Quantities	5, 10, 25, 50, 100 pcs
Packaging	Cardboard Box
Number of Variants	9

Features and Applications

Manufactured from A2 (AISI 304) stainless steel.
Extra large flat washer design with an outside diameter four times the nominal fastener size.
Wide bearing surface helps distribute clamping loads over a larger area.
Can help reduce localized contact pressure beneath bolt heads and nuts.
Suitable for compatible mounting panels, brackets, equipment fittings and mechanical assemblies.
Plain circular design without a dedicated locking or sealing mechanism.
Available in nine nominal sizes from M3 to M16.
Supplied in cardboard boxes containing 5 to 100 washers.

Available Sizes and Part Numbers

Nominal Size	Catalogue Dimensions	Box Quantity	Osculati Part No.
M3	3x12 mm	100 pcs	A2-9021B-03X012
M4	4x16 mm	100 pcs	A2-9021B-04X016
M5	5x20 mm	50 pcs	A2-9021B-05X020
M6	6x24 mm	50 pcs	A2-9021B-06X024
M8	8x32 mm	25 pcs	A2-9021B-08X032
M10	10x40 mm	25 pcs	A2-9021B-10X040
M12	12x48 mm	10 pcs	A2-9021B-12X048
M14	14x56 mm	10 pcs	A2-9021B-14X056
M16	16x64 mm	5 pcs	A2-9021B-16X064

Size Selection

Select the nominal washer size according to the corresponding metric bolt, screw or threaded rod. The first number in the catalogue dimensions indicates the nominal fastener size, while the second number indicates the washer's enlarged outside diameter.

For example, 8x32 mm indicates a washer for nominal M8 fasteners with an outside diameter of 32 mm. The nominal size should not be interpreted as the exact diameter of the central hole.

The exact inner hole diameters, washer thicknesses and dimensional tolerances are not specified in the supplied catalogue information.