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Flat Washer DIN125
Metric
| M3 | M4 | M5 | M6 | M8 | M10 | |
| dc inner dia | 3.2-3.38 | 4.3-4.48 | 5.3-5.48 | 6.4-6.62 | 8.4-8.62 | 10.5-10.77 |
| d outer dia | 6.64-7 | 8.64-9 | 9.64-10 | 11.57-12 | 15.57-16 | 19.48-20 |
| h thickness | 0.45-0.55 | 0.7-0.9 | 0.9-1.1 | 1.4-1.8 | 1.4-1.8 | 1.8-2.2 |
| M12 | M14 | M16 | M18 | M20 | M22 | |
| dc inner dia | 13-13.27 | 15-15.27 | 17-17.27 | 19-19.33 | 21-21.33 | 23-23.33 |
| d outer dia | 23.48-24 | 27.48-28 | 29.48-30 | 33.38-34 | 36.38-37 | 38.38-39 |
| h thickness | 2.3-2.7 | 2.3-2.7 | 2.7-3.3 | 2.7-3.3 | 2.7-3.3 | 2.7-3.3 |
| M24 | M27 | M30 | M36 | M42 | M48 | |
| dc inner dia | 25-25.33 | 28-28.33 | 31-31.39 | 37-37.62 | 43-43.62 | 50-50.62 |
| d outer dia | 43.38-44 | 49.38-50 | 55.26-56 | 64.8-66 | 76.8-78 | 90.60-92 |
| h thickness | 3.7-4.3 | 3.7-4.3 | 3.7-4.3 | 4.4-5.6 | 6-8 | 7-9 |
Product Overview
The PEEK DIN 125 Flat Washer is a high-performance polymer washer precision-machined from unfilled PEEK (polyetheretherketone), delivering exceptional chemical resistance, thermal stability, and ultra-low outgassing. Designed to DIN 125 dimensional standards, it provides uniform load distribution and surface protection in demanding assembly environments — from semiconductor wafer fabrication tools to chemical processing equipment and medical devices.
Why PEEK Washers for Semiconductor Applications
- Ultra-Low Outgassing — No volatile organic compounds (VOC) released under vacuum or elevated temperature. Meets semiconductor cleanroom outgassing specifications (ASTM E595).
- Plasma & Chemical Resistant — Withstands aggressive wet chemistries (HF, H₂SO₄, NH₄OH, H₂O₂), plasma etch environments, and solvent cleaning baths commonly used in front-end wafer processing.
- Metal-Free & Non-Magnetic — Eliminates risk of metallic contamination in sensitive processes: wafer handling, ion implantation, lithography, CMP, and metrology stations.
- Thermal Stability — Continuous service temperature of 280°C with glass transition at 143°C. Performs reliably in bake-out cycles, vacuum chambers, and hot chemical baths.
- Electrical Insulation — Excellent dielectric properties. Ideal for electrical isolation in test handlers, probers, and power semiconductor assembly.
- High Purity — Manufactured from virgin unfilled PEEK resin. No fillers, no pigments — minimizing particle generation in ISO Class 1–5 cleanrooms.
Applications — Semiconductor & Beyond
| Industry | Typical Use |
|---|---|
| Semiconductor Front-End | Wet bench fixtures, etch chamber mounting, wafer carrier assemblies, CMP tool isolation |
| Semiconductor Back-End | Test handler insulation, prober card mounting, die-bonding equipment |
| Flat Panel Display (FPD) | LCD/OLED manufacturing tooling, vacuum chamber hardware |
| Chemical Processing | Pump flanges, valve assemblies, reactor vessel joints |
| Medical & Life Sciences | Surgical instruments, diagnostic equipment, sterilization trays |
| Aerospace | Avionics enclosures, radar assemblies, lightweight structural joints |
| Analytical Instruments | Mass spectrometers, chromatography columns, HPLC fittings |
Key Advantages over Metallic Washers
- Weight reduction — ~80% lighter than stainless steel washers
- Galvanic corrosion eliminated — no dissimilar metal contact issues
- Self-lubricating — low coefficient of friction reduces galling
- No magnetic interference — critical for MRI, electron beam, and ion beam equipment
- Acoustic & vibration damping — superior to metals in dynamic environments
Ordering Information
Brand: Screwtool| SKU: 125PEEK012| Origin: Made in China | MOQ: Contact us | Packaging: Cleanroom-compatible packaging available upon request
For semiconductor-grade PEEK fasteners with full material certification (CoA), lot traceability, and cleanroom packaging, contact Screwtool.
Shanghai Screwtool is a long-standing OEM supplier who has served US and Europe fastener industry for over 20 years.
If you have regular demands for screws and fasteners, we recommend that you can contact us directly (info@shscrewtool.com) for economic offer and complete service.
