R 3/4 Pipe Plug, DIN 906

The R 3/4 pipe plug (DIN 906) closes a tapered R 3/4 port with a 12 mm hex key: 12 mm long, the socket at least 6 mm deep. Available as simplified and threaded STEP files.

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

• Also searched as: R 3/4 pipe plug
• Model id: din906-r3-4
• Standard: DIN 906:2020-02 · R 3/4, pitch 1.814 mm, R taper pipe thread (ISO 7-1), 55 degree profile, 1:16 taper, right hand

Files

Part key	Simplified	Threaded
din906-r3-4	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
L	Length		12		12	nominal	L1
s	Socket width across flats	12.032	12	12.212	12.122	midpoint of min–max	L0 (min, max: one source)
t1	Socket depth	6			6	single limit (min), modeled at the limit	L1
n	Threads per inch		14		14	nominal	L2
P	Pitch		1.814		1.814	nominal	L2
h	Thread height		1.162		1.162	nominal	L2
d	Major diameter (gauge diameter)		26.441		26.441	nominal	L2
d2	Pitch diameter		25.279		25.279	nominal	L2
d1	Minor diameter		24.117		24.117	nominal	L2
a	Gauge length		9.5		9.5	nominal	L1
alpha	Flank angle		55		55	nominal	L1
taper	Taper		16		16	nominal	L1

Drawing

As a PDF: CC-DIN906-SZ-3-4.pdf.

The R 3/4 pipe plug beside the R 1/2 and the R 1

The R 3/4 is number 5 of the 8 DIN 906 pipe plugs published here, listed from R 1/8 to R 1-1/2.

• Length (L): 12 mm on the R 3/4 pipe plug, against 10 mm on the R 1/2 and 12 mm on the R 1.
• Socket width across flats (s): 12 mm on the R 3/4 pipe plug, against 10 mm on the R 1/2 and 17 mm on the R 1.
• Socket depth (t1): at least 6 mm on the R 3/4 pipe plug, against at least 5 mm on the R 1/2 and at least 6 mm on the R 1.
• Threads per inch (n): 14 mm on the R 3/4 pipe plug, against 14 mm on the R 1/2 and 11 mm on the R 1.
• Pitch (P): 1.814 mm on the R 3/4 pipe plug, against 1.814 mm on the R 1/2 and 2.309 mm on the R 1.
• Thread height (h): 1.162 mm on the R 3/4 pipe plug, against 1.162 mm on the R 1/2 and 1.479 mm on the R 1.
• Major diameter (gauge diameter) (d): 26.441 mm on the R 3/4 pipe plug, against 20.955 mm on the R 1/2 and 33.249 mm on the R 1.
• Pitch diameter (d2): 25.279 mm on the R 3/4 pipe plug, against 19.793 mm on the R 1/2 and 31.77 mm on the R 1.

Other sizes

• One size smaller: R 1/2 Pipe Plug, DIN 906, 10 mm hex key, length 10 mm.
• One size larger: R 1 Pipe Plug, DIN 906, 17 mm hex key, length 12 mm.

Documents

• CC-DIN906-DS-R3-4.pdf: 3/4 datasheet: values with levels, sources
• CC-DIN906-SZ-3-4.pdf: 3/4 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

etb-iso7-1, fasten-it-din906, gewinde-normen-bspt, iso228-1-2000-sample, torqbolt-din906, wikipedia-bsp. Full citations: the method page and this size's datasheet.

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