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 plastic washers are designed for dynamically loaded bolt connections, making them ideal for use in vehicle and plant construction. They ensure reliable performance under movement and load. Bülte offers a standard range from M3 to M16. View available plastic washers
DIN 6902 plastic washers are designed for combination screws and precise fastening applications in mechanical engineering and gear systems. These plastic fasteners ensure accurate positioning and reliable performance. Available sizes include M2.5 to M10. View technical data
ISO 7093-1 / DIN 9021 plastic washers are plain washers with a large outer diameter, ideal for distributing forces on soft materials. Also known as fender washers, they are widely used in lightweight construction, equipment manufacturing, and control cabinet assembly. Bülte offers these washers in sizes from M2 to M20. View product details
Bülte also offers plastic washers according to the French standard NFE 25-513, including MU variants (M2.5 to M20) and ZU variants (M2.5 to M6). These NFE plastic washers are widely used in international and OEM projects.
Self-adhesive plastic washers according to DIN 125, DIN 433, and DIN 9021 standards are available in sizes from M2 to M20. They simplify assembly, especially in hard-to-reach areas or overhead applications. Find the right self-adhesive washer
Custom Plastic Washers
When Standard DIN & ISO Washers Are Not Enough
Not every application can be covered with standard washers according to ISO, DIN, UNI, or NFE. For specific design requirements or demanding environments, standard nylon (PA) washers may reach their limits. In these cases, custom plastic washers provide the ideal solution.
A wide range of plastic materials is available, including PE-HD, PP, POM, PC, PA-GF, PVC, PVDF, PTFE (Teflon), silicone, compressed fiber, and hard paper – enabling tailored solutions for every application:
- custom inner and outer diameters and material thicknesses
- Selection of suitable plastics for special mechanical, thermal, or chemical requirements
- custom or colored washers for marking or design integration (e.g. red, yellow, orange, black washers)
- special designs such as shoulder washers, custom shapes, or functional elements
Custom-made plastic washers from Bülte are the right choice when standard solutions are not sufficient. Get expert advice and find the optimal fastening solution for your application.
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 (standard plain washers)
- ISO 7092 = DIN 433 (washers for socket head screws)
- ISO 7094 = DIN 440 (washers for timber construction)
- ISO 7093-1 = DIN 9021 (large outer diameter / fender washers)
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 based on DIN standards (e.g. ISO 7089 = DIN 125), making plastic washers largely interchangeable in international applications when the same standard is specified.
What materials are used for plastic washers according to ISO and DIN?
The material selection depends on the specific application of the plastic washer and its mechanical, thermal, and chemical requirements.
- PA (Nylon/Polyamide): high strength and durability
- POM: dimensionally stable and precise
- PP / PE: chemically resistant and lightweight
- PTFE (Teflon): excellent resistance to aggressive media
Why use plastic washers according to ISO or DIN?
Standardized plastic washers ensure defined dimensions, high interchangeability, and reliable fastening performance. They simplify design, engineering, and global procurement processes.
Where are plastic washers according to ISO and DIN used?
Plastic washers according to ISO and DIN are widely 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 plastic washers, also known as fender washers, have a large outer diameter. They 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?
NFE (France) and UNI (Italy) washer standards often correspond to DIN and ISO standards with similar geometries and dimensions. This enables international compatibility and sourcing, although minor differences in tolerances may occur.