M4x8.1 Heat-set Insert (Threaded Insert For Printed Parts), Heat-set threaded insert

The M4x8.1 heat-set insert (Heat-set threaded insert): length 8.1 mm, knurl outside diameter 6.3 mm, pilot diameter 5.5 mm. Available as simplified and threaded STEP files.

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

• Also searched as: M4x8.1 insert
• Model id: heat-set-inserts-m4x8-1
• Standard: Heat-set threaded insert · size M4x8.1

Files

Part key	Simplified	Threaded
heat-set-inserts-m4x8-1	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
L	Length		8.1		8.1	nominal	L1
d1	Knurl outside diameter		6.3		6.3	nominal	L1
d2	Pilot diameter		5.5		5.5	nominal	L0 (nom: one source)

Drawing

As a PDF: CC-HSINSERT-SZ-M4x8.1.pdf.

What each maker states

• Recommended hole, per maker: CNC Kitchen 5.7 mm, ruthex 5.6 mm.
• Wall around the hole, per maker: CNC Kitchen 2.1 mm, ruthex 2.1 mm.
• Minimum hole depth, per maker: CNC Kitchen 9.1 mm, ruthex 9.1 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 M4x8.1 heat-set insert beside the M4x4 and the M5x5.8

The M4x8.1 is number 10, counting from the smallest, of the 15 Heat-set threaded insert heat-set inserts published here, from M2x3 to M8x12.7.

• Length (L): 8.1 mm on the M4x8.1 heat-set insert, against 4 mm on the M4x4 and 5.8 mm on the M5x5.8.
• Knurl outside diameter (d1): 6.3 mm on the M4x8.1 heat-set insert, against 6.3 mm on the M4x4 and 7.1 mm on the M5x5.8.
• Pilot diameter (d2): 5.5 mm on the M4x8.1 heat-set insert, against 5.5 mm on the M4x4 and 6.3 mm on the M5x5.8.

Other sizes

• One size smaller: M4x4 Heat-set Insert (Threaded Insert For Printed Parts), Heat-set threaded insert.
• One size larger: M5x5.8 Heat-set Insert (Threaded Insert For Printed Parts), Heat-set threaded insert.

Documents

• CC-HSINSERT-DS-M4x8.1.pdf: M4x8.1 datasheet: values with levels, sources
• CC-HSINSERT-SZ-M4x8.1.pdf: M4x8.1 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

cnckitchen-inserts, ruthex-inserts. Full citations: the method page and this size's datasheet.

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