Flange Washers - Pumps, Valves, Piping and Fittings
Flange washers are load-distribution washers used beneath bolt heads or nuts in marine pump, valve, piping and fitting connections. They increase bearing area, protect flange surfaces and help maintain reliable bolted joint preload.
ProShipWorks provides end-to-end support to source and supply Flange Washers for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Flange Washers |
|---|---|
| Product Category | Pumps, Valves, Piping and Fittings |
| Product Reference | 646 |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Large bearing surface for load distribution |
| 2. Suitable for bolted flange connections |
| 3. Helps protect painted or machined flange faces |
| 4. Available in carbon steel, stainless steel and non-ferrous materials |
| 5. Used with compatible bolts, nuts and gasketed joints |
Applications of Flange Washers
| Application |
|---|
| 1. Marine pumps and pump skids |
| 2. Valves and pipe flange connections |
| 3. Shipboard piping, fittings and equipment foundations |
Models & Manufacturers
| Model | Manufacturer |
|---|---|
| ISO 7093-1 / DIN 9021 large outside diameter washer | |
| ISO 7089 / DIN 125 flat washer |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| ISO 7093-1 / DIN 9021 | Type | Large outside diameter flat washer | — |
| ISO 7089 / DIN 125 | Type | Standard flat washer | — |
| All applicable sizes | Material | Carbon steel, stainless steel or non-ferrous alloy | — |
| All applicable sizes | Nominal size | Matched to bolt diameter and flange design | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | Common dimensional references include ISO 7093-1, DIN 9021, ISO 7089 and DIN 125. Material and mechanical property requirements should be specified according to the applicable washer material standard and purchase specification. |
|---|---|
| Class Approval | Washers are generally standard fastening components and are not individually type-approved by classification societies. For classed vessels, material certificates, traceability and installation may be subject to DNV, ABS, Lloyd's Register, BV or ClassNK requirements. |
Installation, Maintenance & Safety Information
| Installation Notes | Select the washer for the bolt size, material compatibility and required bearing area. Install clean, flat and fully seated beneath the bolt head or nut. Tighten the joint using the specified torque or tension sequence. |
|---|---|
| Maintenance Tips | Inspect accessible washers during flange maintenance for corrosion, deformation, cracking or embedding. Replace damaged or heavily corroded washers and verify that replacement material is compatible with the bolts and marine environment. |
| Safety Notes | Depressurize, drain and isolate piping before loosening flange bolts. Use suitable corrosion-resistant materials where required, follow approved tightening procedures and never substitute washers that do not match the bolt and flange design. |
Request a Quote for Flange Washers
Contact ProShipWorks for marine or industrial product sourcing, quotations and delivery.
- Vessel name and IMO number
- ETA / vessel schedule
- Berth or vessel location
- Required quantity
- Preferred delivery window
- Shipping agent contact details
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