2.5 mm Steel Ball (Bearing Ball), ISO 3290-1

The 2.5 mm steel ball (ISO 3290-1): nominal ball diameter 2.5 mm. Available as simplified STEP files.

How these parts are made, and what the levels mean: read the method

• Also searched as: 2.5 mm steel ball
• Model id: iso3290-d2-5
• Standard: ISO 3290-1:2014 · size 2.5 mm

Files

Part key	Simplified
iso3290-d2-5	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
Dw	Nominal ball diameter		2.5		2.5	nominal	L1

Drawing

As a PDF: CC-ISO3290-SZ-2.5.pdf.

The 2.5 mm steel ball beside the 2.38125 mm and the 2.77812 mm

The 2.5 mm is number 3, counting from the smallest, of the 28 ISO 3290-1 steel balls published here, from 2 mm to 8 mm.

• Nominal ball diameter (Dw): 2.5 mm on the 2.5 mm steel ball, against 2.38125 mm on the 2.38125 mm and 2.77812 mm on the 2.77812 mm.

Other sizes

• One size smaller: 2.38125 mm Steel Ball (Bearing Ball), ISO 3290-1.
• One size larger: 2.77812 mm Steel Ball (Bearing Ball), ISO 3290-1.

Documents

• CC-ISO3290-DS-2.5.pdf: 2.5 datasheet: values with levels, sources
• CC-ISO3290-SZ-2.5.pdf: 2.5 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

ceramicspeed-balls-datasheet, iso3290-1-2014-sample, mba-balls-catalogue. Full citations: the method page and this size's datasheet.

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