Standard parts · fastener

Flat washers (ISO 7089)

ISO 7089 flat washers: 11 sizes. Dimensions: outer diameter, inner diameter, thickness. Threads M2, M2.5, M3 and more. Use parts in kernelCAD Studio or MCP.

Front and top view of M6 flat washer (ISO 7089), projected from the catalog STEP file. The catalog solid is simplified (no modeled thread or drive recess), so read dimensions from the table, not from the drawing.

Dimensions

Part	Thread	Outer diameter (mm)	Inner diameter (mm)	Thickness (mm)
M2 flat washer (ISO 7089)	M2	5	2.2	0.3
M2.5 flat washer (ISO 7089)	M2.5	6	2.7	0.5
M3 flat washer (ISO 7089)	M3	7	3.2	0.5
M4 flat washer (ISO 7089)	M4	9	4.3	0.8
M5 flat washer (ISO 7089)	M5	10	5.3	1
M6 flat washer (ISO 7089)	M6	12	6.4	1.6
M8 flat washer (ISO 7089)	M8	16	8.4	1.6
M10 flat washer (ISO 7089)	M10	20	10.5	2
M12 flat washer (ISO 7089)	M12	24	13	2.5
M16 flat washer (ISO 7089)	M16	30	17	3
M20 flat washer (ISO 7089)	M20	37	21	3

Standard: ISO 7089
Category: fastener
Licence: MIT

How the catalog geometry was checked

Verified method: S3 sweep; checked, not proven
Verified threads: M2, M2.5, M3, M4, M5, M6, M8, M10, M12
Verified thread points: 9
Verified requirements: envelope bbox band, volume >= 1 mm^3
Verified boundaries: 0 (discrete domain)
Verified points: 9

Use a size in a model

Every size is a catalog part with a STEP solid and mate connectors. Use a code-CAD script, or ask an agent through the MCP fetch_part tool, by its part ID:

const part = await lib.fetchPart('iso-7089-m2');

Open kernelCAD Studio ↗