Washer, M10

M10 DIN125-10.5/20/2 washer stainless steel, Type of steel - A2

The Strofix washer is an AISI 304 (A2) stainless-steel flat washer manufactured to DIN 125 standard for M10 bolts. The washer has a 10.5 mm bore, 20 mm outer diameter, and 2 mm thickness.

The flat washer is placed between the nut (or bolt head) and the surface being fastened. It distributes the clamping force over a larger area, prevents the nut from digging into softer materials, and provides a smooth bearing surface for consistent tightening. In railing installations, the washer is used under nuts on M10 anchor rods, under bolt heads on base plate assemblies, and in any M10 bolted connection where load distribution is required. AISI 304 (A2) stainless steel matches the grade used on the Strofix M10 screws, cup nuts, and anchor rods.

This SKU is a single fixed configuration — M10, AISI 304 only.

Use cases:

• Under cup nuts or hex nuts on M10 anchor rod ends above railing post base plates
• Under M10 bolt heads in base plate and glass clamp assemblies
• Load distribution on any M10 bolted connection in railing and balustrade systems
• Preventing surface damage from nut or bolt head bearing on stainless-steel components
• General M10 fastening hardware in architectural stainless-steel installations

FAQ:

What bolt size does this washer fit?

The washer fits M10 bolts, screws, and anchor rods. The 10.5 mm bore provides clearance for the M10 shaft.

What are the washer dimensions?

The bore is 10.5 mm, the outer diameter is 20 mm, and the thickness is 2 mm. These are the standard DIN 125 dimensions for M10.

What standard does this washer conform to?

The washer is manufactured to DIN 125, the standard for flat washers. This is equivalent to ISO 7089/7090.

What steel grade is used?

The washer is AISI 304, designated A2 under the European stainless-steel fastener classification. This matches the Strofix M10 screw (DIN 912) and cup nut (DIN 1587) in the same subcategory.

How many washers are needed per bolt?

Typically one washer is placed under the nut. In some assemblies, a second washer may be placed under the bolt head. The specific configuration depends on the installation requirements.

About Anchors & Screws

Anchors and screws are the mechanical fasteners that secure glass adaptors, canopy brackets, railing posts, French balcony holders and other architectural hardware to the building substrate. They transfer structural loads from the visible hardware into concrete, masonry, insulated façades or timber frames.

Strofix supplies 16 products in this category: steel anchors in four lengths (150, 220, 320 and 400 mm) with rod diameters of Ø16 and Ø20 mm, an anchor sleeve (M10 × 80 mm), a spacer tube (L = 100 mm), individual screws (M10 × 45), cup nuts (M10), washers, double stainless-steel threads (M8, 60 and 100 mm), a wood screw (Ø10 × 180 mm), and pre-matched screw-and-fastener sets for 1, 2, 3 or 4 glass canopy brackets — configurable for masonry without insulation, masonry with insulation and timber-frame construction.

Materials are AISI 304 stainless steel and S235 structural steel. The correct fastener depends on wall type, hardware product, bolt size and required embedment depth.