Key Features & Technical Advantages
Close Dimensional Tolerances. For important assemblies, we manufacture our washers to ID/OD tolerances as tight as ±0.02mm to ensure a flawless fit and even load distribution.
All washers can be vibratory polished, deburred or anodised to produce smooth, burr-free surfaces to protect mating parts.
Material Versatility
These washers are available in Carbon steel, stainless steel (304/316), Aluminium, Brass, Copper and engineered plastics.
In addition to normal round washers, we can supply square, oblong, tab and entirely custom shaped flat washers to your exact drawing specifications.
High Volume Consistency
Precision Custom Flat Washers provides the same quality from order to order whether it is a test run or a production run of more than 100,000 pieces.
Corrosion Resistance Options
Optional zinc plating, black oxide, passivation or anodising treatments increase service life for severe or outdoor applications.
| Material Options | Carbon Steel, Stainless Steel 304/316, Aluminum 6061/7075, Brass, Copper,Carbon fiber |
| Outer Diameter (OD) | M2 – M100 (custom sizes available) |
| Inner Diameter (ID) | M2 – M90 (precision reamed) |
| Thickness | 0.3mm – 10mm (±0.02mm tolerance) |
| Standards Compliance | DIN 125, DIN 9021, ISO 7089/7090, ANSI/ASME B18.22.1 |
| Surface Treatment | Zinc plating, black oxide, anodizing, passivation, nickel plating |
| Temperature Range | -50°C to +300°C (material dependent) |
| Production Methods | CNC stamping, laser cutting, CNC turning, precision grinding |
Applications Across Industries
Engineers and procurement professionals in reliable industries trust our washers.
| ※ Electronics & Electrical: Thin-gauge flat washers safeguard sensitive components in PCB mounting hardware, enclosure fastening, and heat sink assemblies. | ※ Medical Devices: Biocompatible, burr-free washers in cleanrooms are necessary for surgical and diagnostic equipment. |
| ※ Automotive & EV: Precision Custom Flat Washers absorb vibration and prevent loosening for engine assemblies, battery pack installation, and chassis attaching. | ※ Automation & Robotics: Precision Custom Flat Washers guarantee consistent accuracy in automated manufacturing lines and robotic joint assemblies. |
Customization Capabilities
Key-CNC is a specialist in bespoke fastening. If typical catalogues don't suit your technical needs, our crew can produce Precision Custom Flat Washers from your drawings, CAD files or sample parts.
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Dimensions & Tolerances OD from M2 to M100, ID from M2 to M90, thickness from 0.3mm to 10mm all can be customised to your drawing. Standard size ranges are available with free tooling and tight tolerances are generally available to ±0.02mm. |
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Profiles & Machining Capability We provide square, rectangular, oblong, D-shaped, tab-lock and entirely irregular profiles in addition to round washers. In-house CAM programming is used for complicated cuts, notches and slots for quick turnaround, wire EDM or high-precision laser cutting. |
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Materials & Grades There are over 20 grades of carbon steel, stainless steel, aluminium alloys, brass, copper and designed polymers in the material and hardness parameters. Heat Treatment, Cold Working and Tempering are performed to ASTM, DIN or internal hardness criteria. |
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Surface Finishing Custom finishing choices include zinc electroplating (clear, blue, yellow or black chromate), electroless nickel plating, hard anodising (Type II and III for aluminium), black oxide, Dacromet coating and stainless steel passivation. The choice of each treatment is made according to several parameters such as lubrication, corrosion resistance or attractiveness. |
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Deburring & Surface Roughness Control Precision assembly is threatened by burrs and sharp edges. Where you want to go with your surface roughness (Ra) is available with electropolishing, centrifugal disc finishing, vibratory tumbling and hand edge-breaking. |
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Packaging & Delivery Options Custom packaging choices include labelled poly bags, partitioned trays, bulk bagging and OEM-branded retail boxes. All orders include dimensional inspection reports, material certificates and lot traceability. |
Special Production Processes
Looking for custom flat washers that are the proper shape, surface quality and mechanical attributes for your application? Key-CNC's multi-process manufacturing floor is your source. Our experts will evaluate your material, tolerance, batch size and cost goals to determine the optimum solution for production.
● CNC Stamping & Progressive Die - Progressive die stamping provides the lowest unit cost and highest consistency for medium to high volume orders (5,000–500,000+ pcs). In our tooling department we design and construct dies using CNC EDM and wire-cutting. Typical death life is greater than 1 million strokes. In-die tapping, coining and marking can be used to build complex washer assemblies.
● Laser Cutting & Profiling - Fibre laser cutting offers zero tooling lead time for prototypes, low volume runs and demanding non-round profiles. We cut washers from sheet stock up to 25mm thick and kerf widths to 0.1mm. This process is particularly suited for rapid turn custom geometries where fabrication of a stamping die is not cost effective.
● CNC Turning & Precision Boring - For those applications where ID concentricity and surface polish are required, we manufacture washers from bar stock on CNC turning centres. Concentricity (ID to OD) .01mm Surface finishes to Ra 0.4um This procedure is vital for aerospace and medical grade components.
● Grinding and Lapping Surface - Our surface grinding and lapping stations guarantee flatness of 0.05mm and thickness homogeneity across the whole batch for applications requiring ultra-precise thickness control and parallelism. If you need a large volume parallelism, you use twin disc grinding.
● Heat Treatment & Hardening - Capabilities: Quenching & tempering, case hardening (carburizing/nitriding), precipitation hardening of aluminium alloys. Hardness is controlled from HRC 20 to HRC 62 by defined manufacturing parameters and batch testing.
Guide To Material Selection
Selecting the proper material for your custom flat washers is important for long-term performance. Here's a fast reference guide to help you pick the right material for your application.
◆ Carbon Steel (Q235, 45#, 65Mn) – Economical for general-purpose applications. 65Mn spring steel is excellent in elasticity for lock and spring washers. Recommended surface treatment for corrosion protection.
◆ Stainless Steel 304 / 316 - Outstanding corrosion resistance for food processing, marine and medical use. Molybdenum is added to grade 316 to improve its resistance to pitting from exposure to chlorides.
◆ Aluminium 6061 / 7075 – Light and great strength to weight ratio. 7075 alloy is aircraft grade and heat treatable to T6 state. Great for aerospace, automotive and consumer electronics where weight savings count.
◆ Brass & Copper - Non-magnetic, good electrical conductivity and natural corrosion resistance. For electrical grounding, plumbing, and decorative architectural hardware.
Inspection & Quality Control
Precision Custom Flat Washers are subject to strict quality control throughout the manufacturing process. At our manufacturing plant in Shenzhen we have optical comparators, coordinate measuring machines (CMM) and hardness testing equipment to assure dimensional accuracy and material characteristics. We have full traceability on all raw materials used and can give inspection reports, material certificates and compliance documentation on request. We have a quality control system in place to make sure that whatever washer you put with us, 100 pieces or 100,000 pieces, will meet or exceed the criteria you set.
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