DIN 125 Molybdenum Washer – Standard Flat Washer in High-Purity Molybdenum
The DIN 125 Molybdenum Washer is a precision-engineered flat washer manufactured in accordance with the German Institute for Standardization (DIN) 125 specification. Made from high-purity molybdenum, this washer combines the dimensional consistency of a standardized fastener with the exceptional high-temperature performance of refractory metals.
Designed for use in extreme environments, the DIN 125 molybdenum washer provides reliable load distribution and spacing in assemblies where conventional stainless steel or carbon steel washers cannot survive due to thermal degradation.
Pioneer New Material produces these washers to exact DIN 125 dimensions while offering flexibility in material grade, surface finish, and tolerance control.
Key Features
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DIN 125 Standard Compliance – Manufactured to precise inner diameter (ID), outer diameter (OD), and thickness specifications per DIN 125.
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High-Temperature Resistance – Maintains mechanical integrity up to 1,900°C (3,450°F) in inert or vacuum atmospheres.
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Excellent Creep Resistance – Retains dimensional stability under prolonged thermal stress.
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Vacuum Compatibility – Extremely low vapor pressure, suitable for ultra-high vacuum (UHV) applications.
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Corrosion Resistance – Resistant to many acids, molten metals, and aggressive chemical environments.
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Customizable Options – Available in various molybdenum grades (pure Mo, TZM, Mo-La) and surface finishes.
Typical Applications
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High-temperature vacuum furnaces (fastening and spacing components)
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Semiconductor manufacturing equipment
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Aerospace and defense assemblies
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Glass melting and ceramic processing kilns
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Medical device manufacturing (high-temperature sterilization environments)
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Load distribution in refractory metal bolted joints
Specifications
| Parameter | Details |
|---|---|
| Standard | DIN 125 |
| Material | Molybdenum (Mo) |
| Purity | ≥99.95% |
| Density | 10.2 g/cm³ |
| Melting Point | 2,620°C (4,748°F) |
| Operating Temperature | Up to 1,900°C (in inert/vacuum) |
| Surface Finish | As-rolled, ground, or polished |
| Available Grades | Pure Molybdenum, TZM (Titanium-Zirconium-Molybdenum), Mo-La (Molybdenum-Lanthanum) |
Note: For applications involving oxidizing atmospheres at high temperatures, we recommend using molybdenum-lanthanum (Mo-La) or TZM alloy washers, or applying protective coatings. Please consult our technical team for material selection guidance.
DIN 125 Dimensional Reference
| Nominal Size | Inner Diameter (ID) | Outer Diameter (OD) | Thickness |
|---|---|---|---|
| M2 | 2.2 mm | 5.0 mm | 0.3 mm |
| M3 | 3.2 mm | 7.0 mm | 0.5 mm |
| M4 | 4.3 mm | 9.0 mm | 0.8 mm |
| M5 | 5.3 mm | 10.0 mm | 1.0 mm |
| M6 | 6.4 mm | 12.0 mm | 1.6 mm |
| M8 | 8.4 mm | 16.0 mm | 1.6 mm |
| M10 | 10.5 mm | 20.0 mm | 2.0 mm |
| M12 | 13.0 mm | 24.0 mm | 2.5 mm |
Custom sizes beyond DIN 125 specifications are available upon request.
Why Choose Pioneer New Material?
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Standard-Compliant Manufacturing – DIN 125 dimensions strictly controlled with precision tooling.
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Material Certification – 100% material traceability and inspection reports available.
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Custom Capabilities – Non-standard sizes, special tolerances, and alternative refractory metals (tungsten, tantalum) available.
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Fast Lead Times – Efficient production for both prototype sampling and mass production.
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Technical Support – Experienced engineering team to assist with application-specific requirements.
Ordering Information
To request a quotation, please provide the following:
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Nominal Size (e.g., M4, M6, M8)
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Quantity
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Material Grade (pure Mo, TZM, Mo-La)
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Surface Finish (as-rolled, ground, polished)
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Any special requirements (tolerances, coating, certification)
