Disc Spring RFQ Checklist | Drawing, Load, Material and Quantity

Start with the standard or drawing reference

If the spring follows DIN 2093, DIN 6796 or a customer drawing, say that first. It gives FeTech a defined starting point and reduces the risk of quoting the wrong geometry family.

For custom projects, a draft drawing, cross-section sketch or marked-up photo is better than a product name alone.

Share the dimensions that actually matter

The minimum geometry package is outside diameter, inside diameter, thickness and free height if known. If the spring is already installed in an assembly, add available stack height, guide diameter and seating arrangement.

Without these basics, the quote becomes a rough estimate and the next email usually has to ask for the same missing data.

• Outside diameter, inside diameter, thickness and free height.
• Available installed height and permitted movement.
• Bolt size or guide diameter where the washer is guided.
• Whether contact flats, support faces or special edge conditions matter.

Load and application data make the biggest difference

A serious spring quotation is really a load application review. Share the target load at working deflection, whether the spring is static or dynamic, expected cycle life and whether the design uses one spring or a stack.

This information can change the material and stack arrangement even when the nominal size stays the same.

• Target load at working deflection.
• Single spring or stack arrangement.
• Static preload or dynamic cycle duty.
• Temperature range and corrosion exposure.

Add the stack arrangement if the part is not used alone

Disc spring procurement changes when the washer is part of a stack. Parallel sets, series sets and mixed stacks create different force, travel and friction behavior, so the supplier needs to know how the parts will be arranged.

If the current stack is unknown, photos or a simple sketch still help. The goal is to avoid quoting a single washer when the real project depends on stack behavior.

• Single spring, parallel stack, series stack or mixed arrangement.
• Number of pieces per set and number of series groups.
• Installed height, working height and any preload method.
• Guidance method, lubrication and contact surface condition where known.

Screen material by service risk, not by habit

Material selection starts from the environment and the consequence of failure. Ordinary spring steel may be the most economical answer in controlled service. Stainless, H13 / SKD61, Inconel, Hastelloy, Nimonic or titanium may be needed when heat, corrosion, weight or retained-load risk becomes critical.

A short note about process media, temperature cycle, outdoor exposure or offshore service can prevent the wrong material recommendation.

Commercial details that help close the project faster

If the project has inspection, certification or sampling requirements, include them early. The same applies to MOQ expectations, annual demand and whether the part is for prototype approval or stable production.

Those details help FeTech quote the right route instead of giving a low-looking price that later changes when documents or samples are added.

A practical RFQ package buyers can copy

For a fast first review, send one compact package instead of scattered messages. Use this order: drawing or dimensions, target load and deflection, material and environment, stack arrangement, quantity, delivery expectation and approval requirements.

That format helps engineering and purchasing because it separates the functional problem from the commercial details.

• Drawing or dimensions: OD, ID, t, H and available installed height.
• Performance: target force, working deflection, stack layout and cycle duty.
• Service: temperature, corrosion media, vibration, sealing or safety risk.
• Purchasing: quantity, sample need, certificates, inspection reports and delivery target.