Flange Nuts - Pumps, Valves, Piping and Fittings
Flange nuts are hexagonal nuts with an integral washer-like flange, used with studs or bolts on marine pumps, valves, piping supports and equipment foundations. The flange distributes clamping load and can reduce surface damage and loosening.
ProShipWorks provides end-to-end support to source and supply Flange Nuts for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Flange Nuts |
|---|---|
| Product Category | Pumps, Valves, Piping and Fittings |
| Product Reference | 645 |
| Brands / Manufacturers | Böllhoff, Bossard, Würth |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Integral load-distributing flange |
| 2. Available in metric sizes |
| 3. Serrated or non-serrated flange options |
| 4. Carbon steel, stainless steel and alloy steel materials |
| 5. Available with corrosion-resistant coatings |
Applications of Flange Nuts
| Application |
|---|
| 1. Marine pump and valve connections |
| 2. Piping supports, brackets and equipment foundations |
| 3. Shipboard machinery and pipe-fitting assemblies |
Models & Manufacturers
| Model | Manufacturer |
|---|---|
| DIN 6923 Hexagon Flange Nut | Various qualified fastener manufacturers |
| ISO 4161 Hexagon Nuts with Flange | Various qualified fastener manufacturers |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| DIN 6923 | Thread size | Metric coarse thread; size selected for the bolted joint | M |
| DIN 6923 | Material | Carbon steel, stainless steel or alloy steel | — |
| DIN 6923 | Property class | Common carbon-steel classes include 8 and 10; verify purchase specification | — |
| ISO 4161 | Flange type | Hexagon nut with integral non-serrated flange | — |
| ISO 3506-2 | Stainless-steel property class | A2 or A4 grades subject to material and strength designation | — |
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 | DIN 6923 and ISO 4161 cover hexagon flange nuts. Mechanical properties may be specified to ISO 898-2 for carbon/alloy steel or ISO 3506-2 for corrosion-resistant stainless-steel nuts. Require EN 10204 material documentation when specified by the purchaser. |
|---|---|
| Class Approval | Individual flange nuts generally do not require separate type approval. For classed vessels, material grade, mechanical properties, corrosion resistance and traceability may be required by DNV, ABS, Lloyd's Register, Bureau Veritas or ClassNK project rules. |
Installation, Maintenance & Safety Information
| Installation Notes | Confirm thread size, pitch, material, property class and flange dimensions. Clean mating threads, use compatible bolts or studs, tighten to the approved torque sequence and torque value, and prevent galvanic contact between dissimilar metals where necessary. |
|---|---|
| Maintenance Tips | Inspect for corrosion, damaged threads, flange distortion and loss of preload during planned maintenance. Replace nuts that are deformed, heavily corroded or reused contrary to the equipment manufacturer's instructions. Verify torque after maintenance when required. |
| Safety Notes | Use only the specified grade and size. Do not mix incompatible threads or substitute a lower-strength nut. Follow vessel lockout procedures, use calibrated torque tools, and wear appropriate hand and eye protection during installation or removal. |
Request a Quote for Flange Nuts
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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