304 stainless steel extra thick fender washers provide a wider and more rigid bearing surface than standard flat washers. Their large outside diameter helps distribute clamp load, reinforce thin or soft mating materials, and bridge oversized or elongated mounting holes in industrial equipment and custom assemblies.
Product Specifications and Custom Options
| Product type | Extra thick fender washer / large OD flat washer |
|---|---|
| Material | 304 stainless steel shown; 316 stainless steel and customer-specified alloys available |
| Manufacturing | Blanking or laser cutting, center-hole punching, flattening, deburring and optional polishing or passivation |
| Custom dimensions | Inside diameter, outside diameter, thickness, flatness and edge condition to drawing |
| Applications | Equipment mounting, structural brackets, sheet-metal reinforcement, guardrails, outdoor hardware and OEM assemblies |
Why Use an Extra Thick Large OD Washer?
A standard washer may deform or concentrate pressure when it is installed over a large clearance hole, a slot, thin sheet metal, wood, composites or other relatively soft mating surfaces. Increasing both outside diameter and thickness creates a more stable bearing face and can reduce local indentation. The final washer geometry should still be selected from the actual joint design, bolt size, preload, mating material and allowable bearing stress.
Custom Manufacturing
AODSON supports drawing-based washer production for OEM buyers and industrial projects. Depending on diameter, thickness and order volume, parts may be blanked from sheet, cut from plate, punched, machined or produced through a combined process. Burr removal, edge rounding, flattening, polishing, passivation and project-specific marking can be added after dimensional review.
- Custom metric and inch inside diameters
- Large outside diameter and non-standard thickness
- Round, square or drawing-specific profiles
- Natural, brushed, polished or passivated stainless finish
- Dimensional inspection and material traceability when specified
Typical Applications
- Industrial machinery frames and mounting brackets
- Thin sheet, plate, timber and composite reinforcement
- Outdoor, marine and corrosion-resistant assemblies
- Guardrail, enclosure, rack and equipment installation
- Custom spacers, shims and load-spreading interfaces
Quality Control and Engineering Review
Inspection can cover material grade, inside and outside diameter, thickness, flatness, concentricity, edge condition and surface finish. These flat washers are not spring washers and do not provide a locking function by themselves. Load capacity, torque, preload and joint safety must be confirmed against the customer drawing and application requirements.
Information Needed for a Quotation
Please send the washer inside diameter, outside diameter, thickness, material grade, quantity, finish and any flatness or edge requirements. A drawing or sample is recommended when the part must fit an existing assembly.
Request a quotation for custom extra thick stainless steel washers, review our fastener manufacturing capabilities, or learn about AODSON quality control.
Frequently Asked Questions
Can the outside diameter and thickness be customized?
Yes. AODSON can manufacture non-standard inside diameter, outside diameter and thickness combinations from an approved drawing or sample.
Is 316 stainless steel available?
Yes. 316 stainless steel and other specified alloys can be reviewed for marine, chemical or more corrosive service environments.
Are these washers suitable for locking a bolted joint?
No locking function should be assumed. These are load-distributing flat washers. Any anti-loosening requirement must be addressed by the complete fastener and joint design.
