M2.5x4 Heat-set Insert (Threaded Insert For Printed Parts), Heat-set threaded insert

The M2.5x4 heat-set insert (Heat-set threaded insert): length 4 mm, knurl outside diameter 4.6 mm, pilot diameter 3.9 mm. Available as simplified and threaded STEP files.

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

• Also searched as: M2.5x4 insert
• Model id: heat-set-inserts-m2-5x4
• Standard: Heat-set threaded insert · size M2.5x4

Files

Part key	Simplified	Threaded
heat-set-inserts-m2-5x4	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
L	Length		4		4	nominal	L0 (nom: one source)
d1	Knurl outside diameter		4.6		4.6	nominal	L0 (nom: one source)
d2	Pilot diameter		3.9		3.9	nominal	L0 (nom: one source)

Drawing

As a PDF: CC-HSINSERT-SZ-M2.5x4.pdf.

What each maker states

• Recommended hole, per maker: CNC Kitchen 4.0 mm.
• Wall around the hole, per maker: CNC Kitchen 1.6 mm.
• Minimum hole depth, per maker: CNC Kitchen 5.0 mm.
• The hole depth is each maker's callout on its drawing added to that maker's L, read twice by Claude, and the two reads agree.
• CNC Kitchen's values for this size are figure reads: its table is an image, read twice by Claude, and the two reads agree.

The M2.5x4 heat-set insert beside the M2x4 and the M2.5x5.7

The M2.5x4 is number 3, counting from the smallest, of the 15 Heat-set threaded insert heat-set inserts published here, from M2x3 to M8x12.7.

• Length (L): 4 mm on the M2.5x4 heat-set insert, against 4 mm on the M2x4 and 5.7 mm on the M2.5x5.7.
• Knurl outside diameter (d1): 4.6 mm on the M2.5x4 heat-set insert, against 3.6 mm on the M2x4 and 4.6 mm on the M2.5x5.7.
• Pilot diameter (d2): 3.9 mm on the M2.5x4 heat-set insert, against 3.1 mm on the M2x4 and 3.9 mm on the M2.5x5.7.

Other sizes

• One size smaller: M2x4 Heat-set Insert (Threaded Insert For Printed Parts), Heat-set threaded insert.
• One size larger: M2.5x5.7 Heat-set Insert (Threaded Insert For Printed Parts), Heat-set threaded insert.

Documents

• CC-HSINSERT-DS-M2.5x4.pdf: M2.5x4 datasheet: values with levels, sources
• CC-HSINSERT-SZ-M2.5x4.pdf: M2.5x4 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

cnckitchen-inserts, rule-heat-set-pilot. Full citations: the method page and this size's datasheet.

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