Bülte: Specialist for DIN and ISO Plastic Washers
Plastic plain washers according to DIN and ISO standards are essential fasteners used across a wide range of applications in industry and trade. From small standard washers M1.6 to large DIN / ISO washers up to M90, Bülte offers a broad selection in various materials – ensuring the right plastic washer for every application.
Plastic Plain Washers to DIN, ISO, NFE & UNI Standards – Overview
| DIN | ISO | NFE | UNI | Material (Plastic Washer) | Type of Washer |
|---|---|---|---|---|---|
| DIN 125A | ISO 7089 | - | UNI 6592-69 | Nylon, PA 6.6, PA-GF30, PC, PEEK washers, PE-HD, POM, PP, PTFE (Teflon), rigid PVC, flexible PVC, PVDF, silicone, hard paper, pressboard, self-adhesive washers | standard plain washer (flat washer, no chamfer) |
| DIN 433 | ISO 7092 | NFE 25514 | - | Nylon, PTFE (Teflon), hard paper, pressboard, self-adhesive nylon washers; others on request | flat washer for socket head screws |
| DIN 436 | - | - | - | Nylon; others on request | square washer for timber construction |
| DIN 440 | ISO 7094 | NFE 25513 | - | Nylon; others on request | flat washer for timber construction |
| DIN 1440* | ISO 8738* | - | - | Nylon; others on request | washer for bolts |
| DIN 6902 | - | - | - | Nylon; others on request | washer for combination screws |
| DIN 9021 | ISO 7093-1 | NFE 25513 NFE 25514 |
UNI 6593 | Nylon, PA-GF30, PEEK, PP, PTFE (Teflon), flexible PVC, self-adhesive plastic washers; others on request | large diameter washer (fender washer) |
* Minor dimensional differences between DIN and ISO (e.g. outer diameter, thickness)
ISO, DIN, NFE & UNI Plain Washers – Standards and Differences
Plastic washers according to ISO and DIN standards are key reference components for design, engineering, and global sourcing of fasteners. They ensure high comparability and interchangeability across international markets. NFE washers (France) are widely used in OEM and automotive applications, while UNI washers (Italy) are often comparable to DIN and ISO standards. However, differences may occur in tolerances and specific washer dimensions of the plain washers.
Dimensions and Tolerances for DIN & ISO Plastic Washers
DIN and ISO standards are typically based on metal specifications. For plastic washers, as well as other fastening elements such as plastic screws, nuts, and spacers, dimensions and tolerances may vary due to material properties. These products are therefore often described as ISO-like or DIN-like (~). Slight deviations can occur, particularly due to shrinkage.
We support you in selecting the right flat plastic washer for your application. Contact us for expert advice.
ISO & DIN Standard Plastic Washers: Sizes and Applications at a Glance
Bülte offers a comprehensive range of flat plastic washers according to ISO and DIN standards, each designed to meet specific functions and application requirements. Made of plastic, these plain washers ensure even load distribution and reliable surface protection, while also meeting additional demands such as corrosion resistance and electrical insulation.
ISO 7089 / DIN 125 washers are classic plain washers used in a wide range of applications. These plastic fasteners ensure even load distribution and reliable surface protection. Available in sizes from M1.6 to M90, the metric washers offer versatile solutions for many industries. View product details
ISO 7092 / DIN 433 washers are compact, thin plain washers specifically designed for socket head screws. Made of plastic they are widely used in precision engineering, electronics, and equipment manufacturing. Available from M2 to M36, Bülte offers reliable solutions for demanding applications. View dimensions and details
DIN 436 washers are square washers with a large bearing surface, ideal for load distribution in structural applications. They are commonly used in timber construction and assembly. At Bülte, these plastic washers are available in sizes from M10 to M22. Request a quote or sample
DIN 440 Form R washers are specifically designed for timber construction and prevent screws from sinking into wood. DIN 440R plastic washers provide reliable load distribution and surface protection in wood assemblies. At Bülte, they are available for metric screws in sizes from M5 to M12. Select plastic washer
DIN 1440 washers are suitable for dynamically stressed bolt connections, such as in vehicle or plant construction. Bülte’s standard range includes sizes from M3 to M16. View available plastic washers...
DIN 6902 washers made of plastic are used for precise applications with combination screws, such as in mechanical engineering or gear systems. Our range includes sizes M2.5, M3, M3.5, M4, M5, M6, M8, and M10. View technical data...
ISO 7093-1 / DIN 9021 washers feature a large outer diameter and are especially effective at distributing forces on soft materials. Typical applications include lightweight construction, equipment manufacturing, and control cabinet construction. These washers, also known as fender washers, are available in plastic at Bülte in sizes M2 to M20. View product details...
Additionally, Bülte also offers plastic washers according to the French standard NFE 25-513 in the MU variants (M2.5 to M20) and ZU variants (M2.5 to M6), which are particularly relevant in international projects.
In addition, selected self-adhesive plastic washers according to DIN 125, DIN 433, and DIN 9021 are available in sizes from M2 to M20. These washers make fastening much easier – especially in hard-to-reach areas or for overhead installations. Find the right self-adhesive washer...
Custom Washers
When Standard DIN Washers Are Not Enough
Not every application can be optimally covered with standard washers according to ISO, DIN, UNI, or NFE. Especially in cases of specific construction requirements or special environmental conditions, standard polyamide washers may reach their limits. In such cases, Bülte also offers washers made from other materials, such as PE-HD, PP, POM, PC, PA-GF, PVC, PVDF, PTFE (Teflon), silicone, compressed fiber, or hard paper, as well as custom-made washers tailored precisely to your application:
- custom internal and external diameters, as well as specific material thicknesses
- Selection of suitable plastics for special mechanical, thermal, or chemical requirements
- customized or eye-catching colors for marking or integration into existing designs (e.g., red, yellow, orange, black washers)
- special geometries, such as washers with a collar, custom contours, or additional functional elements.
If plastic washers from the extensive Bülte standard range do not meet your requirements, we are happy to advise you on custom manufacturing and provide you with the perfect washers for your construction.
FAQ – Frequently Asked Questions about ISO and DIN Washers
Which ISO standard corresponds to which DIN standard for washers?
Many commonly used standards are directly comparable:
- ISO 7089 = DIN 125
- ISO 7092 = DIN 433
- ISO 7094 = DIN 440
- ISO 7093-1 = DIN 9021
What is the difference between ISO and DIN plastic washers?
ISO and DIN standards define the geometry, dimensions, and tolerances of washers. Many ISO standards are derived from or directly align with DIN standards (e.g., ISO 7089 = DIN 125). As a result, plastic washers conforming to ISO or DIN standards are generally interchangeable internationally, provided the standards are the same.
What materials are used for plastic washers according to ISO and DIN?
The material selection depends on the specific application and its mechanical, thermal, and chemical requirements.
- PA (Polyamide): high strength for mechanical loads
- POM: dimensionally stable and precise
- PP / PE: chemically resistant and lightweight
- PTFE (Teflon): suitable for aggressive media
Why use plastic washers according to ISO or DIN?
Standardized parts ensure defined dimensions and high interchangeability. Using ISO or DIN plastic washers guarantees reliable connection design and simplifies construction and procurement processes.
Where are plastic washers according to ISO and DIN used?
Standard plastic washers are commonly used across both industrial and craft applications. Typical use cases include mechanical engineering, electrical engineering, housing construction, wood connections, and applications requiring corrosion resistance or electrical insulation.
What does ISO 7093-1 mean for plastic washers?
ISO 7093-1 describes washers with a large outer diameter. These washers are used when the load needs to be spread over a larger surface area, such as on soft materials or larger holes.
Does Bülte also offer plastic washers according to NFE or UNI standards?
Many ISO and DIN standards for washers have corresponding equivalents in other national standards, such as the French NFE or Italian UNI standards. These standards define comparable geometries and dimensions, facilitating international comparison and procurement.