Flat Washers
Standards: ISO 7089:2000
Flat washers are plain annular components placed beneath a bolt head or nut.
Specifications & details →Washers
Product series, materials and dimensional information.
Prepare your washers inquiry
Specify washer form, inside diameter, outside diameter, thickness, material and quantity. MOQ, samples, lead time and inspection documents are confirmed per order.
Washers are placed beneath a fastener head or nut to provide the specified bearing surface, clearance and stack dimensions. SPM’s catalog covers flat washers and split spring washers, with drawing-based dimensions available for review.
Select the washer by its inside diameter, outside diameter and thickness, then specify material and hardness where required. Flat and spring washers perform different roles; their names do not establish suitability for every joint.
2 series
Spring Washers
Standards: DIN 127 (B):1987
Spring washers in this catalog use a split-ring form.
Specifications & details →No matching series. Contact us to describe the part you need.
Need a different specification?
Choose Customized and share your drawing or requirements.
How to select washers
| Bearing surface | ID, OD & thickness | Material & hardness | Standard or drawing |
|---|---|---|---|
| Check the surface area available beneath the bolt head or nut. | Match hole clearance, outside envelope and assembly stack. | Specify the exact grade and any required hardness or finish. | Choose the correct series and edition; provide a drawing for other geometries. |
Materials and international specifications
SPM reviews carbon steel, alloy steel, stainless steel and non-ferrous material requirements, including titanium and nickel alloys. Exact grade and availability depend on the product and quotation.
| Material family | Information to include |
|---|---|
| Carbon / alloy steel | Exact grade, property class or hardness, heat-treatment and finish requirements. |
| Stainless steel | Grade, service environment, thread and surface-treatment requirements. |
| Titanium / nickel alloys | Exact alloy grade, drawing, critical tolerances and required inspection documents. |
| Aluminum | Exact grade, dimensions, finish and application requirements. |
Send the exact DIN / ISO, ASME, ASTM, API, SAE or JIS standard number and edition. These standards cover different product, material and testing requirements; naming a standard family alone is not a complete specification.
Dimensions and size selection
Selected nominal dimensions for the plain washer series in the referenced DIN 125 A catalog. These figures do not apply to every washer standard and are not a stock list.
| For thread | Inside Ø d1 (mm) | Outside Ø d2 (mm) | Thickness s (mm) |
|---|---|---|---|
| M3 | 3.2 | 7 | 0.5 |
| M4 | 4.3 | 9 | 0.8 |
| M5 | 5.3 | 10 | 1 |
| M6 | 6.4 | 12 | 1.6 |
| M8 | 8.4 | 16 | 1.6 |
| M10 | 10.5 | 20 | 2 |
| M12 | 13 | 24 | 2.5 |
| M16 | 17 | 30 | 3 |
Source: Bossard BN 602 data sheet. ISO 7089 defines a normal-series plain washer standard. DIN 125 A is a legacy reference; confirm the required standard, tolerances and hardness for the quoted part.
Catalog ranges are initial references. Confirm the required dimensions, tolerances, material and applicable standard before ordering. Ranges do not imply that every listed material is available in every size.
Common questions
Can SPM quote customized washers?
Yes. Select Customized and share the drawing, material grade, critical dimensions, quantity and required documents. The quotation confirms the agreed scope.
What if my size or product is not shown?
Choose Customized and provide a drawing, part number or clear description. Include the mating parts and application where they affect the selection.
Are the listed DIN and ISO references always interchangeable?
No. Compare the exact standard editions, dimensions, material requirements and product scope. The original catalog references are starting points for the inquiry.
Request a quotation
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Contact
Seith Lee · +86 15821980914
A brief note is enough to get started.