Durable BS 4320 Aluminium Plain Washers for Load Distribution

They can be manufactured to the dimensions and tolerances specified by the applicable BS 4320 edition or to a customer drawing based on that standard. The enquiry should state the required series, dimensions and any deviations because similar washer names can cover different proportions.

Selection should consider fastener size, washer series, inside and outside diameters, thickness, grade and service environment. The washer must fit the fastener and joint geometry without interfering with nearby features or reducing required edge distance.

Aluminium washers are lightweight, corrosion resistant in many environments and useful where compatibility with aluminium assemblies matters. They are not a universal replacement for steel washers; bearing stress, clamp load, temperature and creep must be evaluated for the joint.

Grade selection depends on required hardness, formability, corrosion resistance, conductivity and availability in the specified thickness. Conex confirms the alloy and temper after reviewing the standard, drawing and service conditions.

Yes. Conex manufactures bs 4320 aluminium plain washers to customer drawings and application requirements. Dimensions, interfaces, material, finish, identification, inspection and packaging can be tailored after an engineering review, subject to process capability and order quantity.

Inside diameter, outside diameter, thickness, flatness and burr limits should follow the stated standard or controlled drawing. Tolerance capability depends on material thickness, tooling and production method, so critical fit requirements should be identified during quotation.

Depending on size, thickness and quantity, washers may be blanked or punched from sheet and then deburred, flattened, cleaned and finished. Special profiles can require laser cutting, machining or dedicated tooling.

Options may include mill finish, cleaning, tumbling, polishing, anodising or conversion coating, subject to alloy and end-use requirements. Finish thickness, colour, masking, electrical contact and cosmetic criteria should be specified.

They may be used together when joint load and environmental compatibility are acceptable, but dissimilar-metal corrosion must be considered. Isolation, suitable coatings or sealants and drainage may be needed in wet or marine exposure.

Inspection can include material verification, inside and outside diameter, thickness, flatness, burr condition and visual finish. Sampling level, certificate requirements and any special gauges should be agreed with the order.

For an accurate quotation, provide a controlled drawing or 3D model, material or alloy requirement, critical dimensions and tolerances, finish, order quantity, annual demand, application and any inspection or documentation needs. Conex reviews manufacturability before confirming tooling, process route, lead time and commercial terms.

BS 4320 covers bright metal washers for general engineering, with forms A–E in sizes from M1.6 to M68. We produce aluminium washers in the common M3–M36 range with inside diameter, outside diameter and thickness as specified in the standard.

Form A and Form B are normal-diameter washers in different thicknesses, while Form C and Form D are larger-diameter washers used to spread load on softer materials. The form and size are selected according to bolt size and bearing surface.

Aluminium washers avoid galvanic corrosion and indentation of aluminium components, distribute clamping load and provide electrical continuity in aluminium assemblies.