8 catalogued sizes, dimensioned to DIN 7603 Type A. Pick any row and the technical drawing redraws to it.
Aluminum Flat Sealing Washers to DIN 7603 Type A are catalogued in sizes M8 to M48, with pitch 1-2 mm, id 8.2-48.3 mm, od 11.4-54.9 mm. 8 sizes are held in the table below, and the technical drawing redraws to whichever row you select.
Standard
DIN 7603 Type A
Size range
M8-M48
Pitch
1-2 mm
ID
8.2-48.3 mm
Catalogued sizes
8
Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.
Applications & Industries
Where Aluminum Flat Sealing Washers are used, and what decides the specification in each case. Stocked from M8 to M48 (nominal bolt size).
Industries that specify Aluminum Flat Sealing Washers
Hydraulic serviceCrush seals under banjo bolts, plugs and threaded fittings.
Fuel systemsSoft-metal sealing at machined fitting faces.
Automotive maintenanceSingle-use sealing washers replaced during fluid service.
Pneumatic equipmentLightweight sealing at air and instrument connections.
Steel fabricationSpreading load under a head or nut and protecting the surface finish.
Machine building & OEMSetting bearing area on soft alloy, plastic and oversized holes.
Typical applications
crushing a flat aluminum ring between two machined faces
sealing a threaded fitting without an elastomer gasket
matching the inside and outside diameters to the fitting seat
replacing the washer after it has been compressed in service
maintaining bolt tension in a joint that settles
spreading clamp load over a soft or oversized bearing face
Service conditions to specify against
Marine and coastal
Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
Sealed joints
Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life.
Hardness matters
Under a high-strength bolt a soft washer embeds into the joint and preload is lost — specify a hardened washer for structural bolting.
Where to use something else
Do not reuse a crushed washer or tighten it against a damaged sealing face; leakage is the usual result.
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
Request a Quotation for Aluminum Flat Sealing Washers
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (DIN 7603 Type A)
Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.
Aluminum Flat Sealing Washers (DIN 7603 Type A) are a type of washers used across industrial assembly. Below is the complete size table together with material, standard and application guidance.
What Are Aluminum Flat Sealing Washers?
Aluminum Flat Sealing Washers are washers defined by DIN 7603 Type A. They are selected by nominal bolt size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.
Materials & Finishes
Common materials include carbon steel (typically zinc plated or hot-dip galvanized), hardened or case-hardened steel where wear matters, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, hardness where relevant, and the surface finish appropriate to your application and environment.
Pricing
Aluminum Flat Sealing Washers are supplied to order. Pricing starts from approximately US$0.040 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.
Inside the plant
Manufactured in our own plant
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Cold heading
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
02
Thread rolling
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
03
Heat treatment
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
04
Surface treatment
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
Frequently Asked Questions
What standard are Aluminum Flat Sealing Washers manufactured to?
Aluminum Flat Sealing Washers are manufactured to DIN 7603 Type A. The dimensional values on this page follow that standard.
What is the size range of Aluminum Flat Sealing Washers?
The table on this page lists 8 sizes for Aluminum Flat Sealing Washers, ranging from M8 to M48. Sizes outside the table can be quoted on request.
In which materials are Aluminum Flat Sealing Washers supplied?
Aluminum Flat Sealing Washers are supplied in carbon steel (zinc plated / HDG) and stainless A2 / A4, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Aluminum Flat Sealing Washers.
How do I request a quotation?
Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.
Need a fastener quote or a spec sheet?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
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