Standard parts · fastener

Lock nuts (DIN 985)

DIN 985 lock nuts: 7 sizes. Dimensions: across flats, height. Threads M3, M4, M5 and more. Use parts in kernelCAD Studio or MCP.

Front and top view of M6 lock nut (DIN 985), 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	Across flats (mm)	Height (mm)
M3 lock nut (DIN 985)	M3	5.5	4
M4 lock nut (DIN 985)	M4	7	5
M5 lock nut (DIN 985)	M5	8	6
M6 lock nut (DIN 985)	M6	10	6
M8 lock nut (DIN 985)	M8	13	8
M10 lock nut (DIN 985)	M10	16	10
M12 lock nut (DIN 985)	M12	18	12

Standard: DIN 985
Category: fastener
Licence: MIT

How the catalog geometry was checked

Verified method: S3 sweep; checked, not proven
Verified threads: M3, M4, M5, M6, M8, M10, M12
Verified thread points: 7
Verified requirements: envelope bbox band, volume >= 1 mm^3
Verified boundaries: 0 (discrete domain)
Verified points: 7

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('din-985-m3');

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