What is your minimum order quantity for custom parts?

We support single-piece prototypes and low-volume runs through CNC machining, 3D printing and urethane casting, and scale to mass production through die casting, injection molding and stamping. Share your target quantity and our engineers will recommend the most cost-effective process.

What tolerances can Sunmy Hardware hold?

Standard CNC tolerances are ±0.01 mm, and critical features can be held down to ±0.005 mm. Dimensions are verified with CMM inspection and documented in FAI reports before shipment.

How do you protect my drawings and intellectual property?

We sign a Non-Disclosure Agreement with you by email before collecting any 3D or CAD files. You work directly with the factory, so your data is never handed off to brokers.

Which quality documents are available with shipments?

Material certificates, RoHS compliance documents, First Article Inspection (FAI) reports and CMM dimensional reports can be supplied per project.

Which manufacturing processes are done in-house?

CNC machining and stamping are performed in our own facilities. Casting and surface finishing are completed by audited partners. All final quality control, CMM inspection and FAI are executed in-house by Sunmy engineers before global shipping.

Which CAD file formats do you accept?

We accept STEP, IGES, STL, DWG/DXF and PDF 2D drawings. Physical samples can also be reverse-engineered.

OEM Custom Precision Stamped Wave Spring Washers Manufacturer Supplier Wholesale High Quality Metal Washer Factory

Product Overview

Shenzhen Sunmy Hardware Co., Ltd. manufactures custom wave spring washers for axial preload and clearance take-up in compact assemblies. The formed ring provides spring force when compressed between mating surfaces. Wave count, contact geometry and usable deflection are matched to the specified assembly rather than treated as one universal configuration.

We manufacture to customer drawings, approved samples and agreed functional requirements, from prototype evaluation to repeat production. Stainless steel, spring steel and other requested alloys are reviewed for the application. Our scope covers manufacturability review, stamping and wave forming, material-specific heat treatment where required, edge finishing and project-defined inspection.

Full Customization to Your Drawing or Sample

Customize the inner and outer dimensions, thickness, free height, working height, wave count, material and finish. Specify the required force at the installed height, or a load-deflection range. These requirements are reviewed together and confirmed in the approved drawing and sample plan; our supply is not limited to catalog sizes.

Engineering & Manufacturing Process Insights

The manufacturing route is selected for the washer geometry, material condition and order volume. The following controls link the formed dimensions to the required load at working height:

Precision Stamping & Wave Forming Blanking and forming tools reproduce the approved outline and wave geometry. Progressive dies or separate operations are selected to suit the design and volume. Tool trials check edge condition, springback, free height and force at the specified working height before the process is released.

Material-Specific Heat Treatment The required thermal cycle depends on the alloy, incoming temper and final condition. Stress relief, hardening and tempering, or precipitation hardening are specified where appropriate, rather than applied identically to every material. Dimensional and load checks follow the approved process.

Deburring & Edge Conditioning Inner and outer edges are finished to the drawing. The specification distinguishes allowable burr height from an edge radius or edge break. Finishing must preserve the thin section and formed profile; inspection conditions and acceptance criteria are agreed before production.

Surface Finishing & Passivation Cleaning, mechanical finishing, stainless steel passivation and material-compatible coatings can be specified. For ASTM A967/A967M passivation, identify the required treatment and acceptance test. Finish thickness, appearance and corrosion-test requirements are defined separately; a polished surface alone does not establish cleanliness or corrosion performance.

Tooling Development & Sample Approval Tooling, sample quantities and production schedules are quoted against the approved design. Samples are evaluated for assembly fit and the agreed force-height requirements before repeat production. Tooling revisions and outsourced heat treatment or finishing, where used, are coordinated within the project plan.

Key Technical Specifications

The fields below define the custom supply scope, not fixed stock sizes or blanket performance ratings. Dimensions, materials, load requirements, tolerances and documentation are confirmed for each project.

Parameter / Feature	Sunmy Custom Manufacturing Scope
Product Category	Custom stamped wave spring washers / wave washers; formed-ring geometry per approved drawing.
Manufacturing Process	Sheet blanking, stamping and wave forming; heat treatment and finishing as required by the approved material and process.
Material Options	Stainless steel: 301, 304, 316 or 17-7PH; specify grade and temper. Spring steel: 65Mn, SK5, SK7, C67S or 50CrV4, in the specified condition. Copper alloys: phosphor bronze, brass or beryllium copper, subject to application review. Nickel alloys and other metals: reviewed individually, not assumed interchangeable.
Inner Diameter (ID)	Actual finished bore dimension and tolerance in mm or inches; specify shaft clearance. An M-size identifies a mating thread, not the washer bore measurement.
Outer Diameter (OD)	Diameter or custom outline per drawing; confirm housing clearance and the required inspection condition.
Material Thickness (t)	Selected for material, formability and load requirements. Strip thickness and its tolerance are specified separately from free height.
Free / Working Height & Load	Define free height H0, installed height H, required force and tolerance, and any additional test heights. Specify usable travel and test conditions.
Wave Configuration	Two-, three-, four- or other multi-wave formed-ring designs to customer requirements. Curved washers and multi-turn wire springs are separate geometries.
Dimensional Tolerances	ID/OD or outline: per approved drawing. Thickness, free height and load tolerance: agreed separately. State whether dimensions are checked free or under a defined load.
Surface Finish & Treatments	Deburring, controlled edge finishing, polishing or cleaning. Stainless steel passivation; electropolishing or compatible coatings on request. Define finish thickness, appearance and any required verification.
Material Condition & Hardness	Alloy-specific temper, mechanical properties and final condition per specification. Any hardness requirement includes the test method and suitability for thin material.
Design Reference Standards	Customer drawing and agreed standard/edition. Legacy DIN 137 or DIN 6904 references require scope and edition review; no blanket current-standard compliance is claimed.
Quality Assurance & Testing	Dimensional/profile checks and force at defined working height per inspection plan. Hardness, corrosion, fatigue and relaxation tests are separate requirements when specified.
Order Quantities	Prototype, pilot and repeat-production quantities to project requirements. MOQ and tooling costs are confirmed in the quotation, not fixed by this listing.
Tooling & Schedule	Tooling, sample submission and repeat production are scheduled separately after review of geometry, material, finish, testing and quantity.

Core Features & Value Propositions

Defined Preload Performance: Specify the required load at working height and its tolerance. For dynamic service, agree the cycle range and retained-load criteria for validation.

Compact Assembly Integration: Match thickness, wave height and ring dimensions to the assembly envelope. Confirm shaft and housing clearance throughout the intended travel.

Controlled Contact Edges: Control burr height, edge break and surface condition around mating components. Final checks cover geometry and load after the agreed finishing operations.

Application-Specific Material Selection: Select alloy, temper and finish against exposure and temperature. Requested corrosion, sterilization or medical requirements form a separate validation scope.

Wave Geometry Matched to Seats: Confirm wave count, crest height and contact locations against the mating seats. Wave uniformity supports repeatable loading; three waves are not a dynamic-balance grade.

Coordinated Custom Manufacturing: Coordinate tooling, forming and secondary processes through one project contact. Approved samples, drawing revision and inspection requirements define repeat-order acceptance.

Target Industrial Applications

Electric Motors & Powertrains: Drawing-specific bearing preload and axial clearance take-up.

Automotive & EV Systems: Custom preload parts for sensors, connectors and actuators, per project approval.

Medical & Diagnostic Equipment: Mechanical preload parts; medical suitability and sterilization require separate validation.

Industrial Pumps, Valves & Compressors: Axial compensation to agreed load/travel; locking is a separate requirement.

Precision Electronics & Optics: Lens barrels, connectors and compact positioning assemblies.

Technical FAQ for Global Buyers

Q1: How is spring force controlled across production batches?

A: The control plan links material grade and condition, strip thickness, forming setup and any heat treatment to force at the specified working height. Agree the load tolerance, fixture, test conditions and sampling frequency. Dimensional inspection alone does not establish the required force-deflection behavior.

Q2: Can Sunmy develop a non-standard washer without a finished drawing?

A: Yes. Send a sample or provide the shaft diameter, housing bore, available free and installed heights, required force range, operating environment and quantities. We review manufacturability and develop the proposal for customer drawing approval and sample validation before production.

Q3: Can the finish be customized for corrosive or regulated applications?

A: Yes. Specify the alloy, finish, exposure and acceptance tests. Passivation, electropolishing and compatible coatings are reviewed accordingly. Appearance does not establish material grade, corrosion performance or medical suitability.

Q4: What are the tooling, prototype and production arrangements?

A: We support custom sample development, pilot batches and repeat orders. Tooling scope, minimum quantity and each delivery stage are confirmed after reviewing the drawing, material availability, secondary processes and testing. Prototype approval establishes the configuration for production.

Q5: What inspection records and supporting documents can be requested?

A: Specify material records, dimensional and load-test reports, conformity documentation and any additional tests in the RFQ. PPAP, FMEA, control plans and applicable compliance evidence are agreed at project setup. Send your drawing or sample details, working-height/load requirements and quantity for a project-specific quotation.

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