Execution standard reference

M12 x 55 Mushroom head square neck bolts — DIN 603 / ISO 8677 / ISO 8678

M12 x 55 is listed in the confirmed supply specifications of the products shown below. Dimensions are referenced against DIN 603 / ISO 8677 / ISO 8678; where these standards differ, both values are shown so the correct one can be confirmed before ordering. Packing quantity, stock status and mechanical property class are confirmed in the quotation. Column symbols: P = thread pitch.

Mushroom head square neck boltsCurrent standardVerified dimensional data

Dimensional reference

Shows dimensions already stored in the standard library. Missing values are not filled automatically.

standardStandard	statusStatus	PPitch · mm	bodyDiameterMaxbodyDiameterMax (mm)	bodyDiameterMinbodyDiameterMin (mm)	neckWidthMaxneckWidthMax (mm)	neckWidthMinneckWidthMin (mm)	neckHeightMaxneckHeightMax (mm)	neckHeightMinneckHeightMin (mm)	headDiameterMaxheadDiameterMax (mm)	headDiameterMinheadDiameterMin (mm)	headHeightMaxheadHeightMax (mm)	headHeightMinheadHeightMin (mm)	threadLengththreadLength (mm)	bL ≤ 125 · mm	b125 < L ≤ 200 · mm	bL > 200 · mm	cornerDistancecornerDistance (mm)	rMaxrMax (mm)	cMaxcMax (mm)	cMincMin (mm)	bearingDiameterMinbearingDiameterMin (mm)
DIN 603	Current	1.75	12	11.3	12.7	11.3	8.75	7.25	30.65	29.35	6.95	6.05	-	30	36	49	-	-	-	-	-
ISO 8677	Historical	1.75	12.7	-	12.7	11.3	8.8	7.2	30	28.7	6.8	6	-	30	36	49	14.7	1.2	-	-	-
ISO 8678	Current	1.75	12	-	12.7	11.82	4	3.2	26.6	-	6.8	6	-	30	-	-	15.37	1.2	2.8	1.8	23.8

standardDIN 603

statusCurrent

P · mm1.75

bodyDiameterMax12

More dimensions

bodyDiameterMin11.3

neckWidthMax12.7

neckWidthMin11.3

neckHeightMax8.75

neckHeightMin7.25

headDiameterMax30.65

headDiameterMin29.35

headHeightMax6.95

headHeightMin6.05

threadLength-

b · mm30

b · mm36

b · mm49

cornerDistance-

rMax-

cMax-

cMin-

bearingDiameterMin-

standardISO 8677

statusHistorical

P · mm1.75

bodyDiameterMax12.7

More dimensions

bodyDiameterMin-

neckWidthMax12.7

neckWidthMin11.3

neckHeightMax8.8

neckHeightMin7.2

headDiameterMax30

headDiameterMin28.7

headHeightMax6.8

headHeightMin6

threadLength-

b · mm30

b · mm36

b · mm49

cornerDistance14.7

rMax1.2

cMax-

cMin-

bearingDiameterMin-

standardISO 8678

statusCurrent

P · mm1.75

bodyDiameterMax12

More dimensions

bodyDiameterMin-

neckWidthMax12.7

neckWidthMin11.82

neckHeightMax4

neckHeightMin3.2

headDiameterMax26.6

headDiameterMin-

headHeightMax6.8

headHeightMin6

threadLength-

b · mm30

b · mm-

cornerDistance15.37

rMax1.2

cMax2.8

cMin1.8

bearingDiameterMin23.8

Verified differences from related standards

Only dimensions present in complete, verified standard data are listed. Related standards are not automatically interchangeable.

Size	Dimension	Compared values
M12	dₛ	DIN 603 12 / ISO 8677 12.7
M12	f	DIN 603 8.75 / ISO 8677 8.8
M12	f	DIN 603 7.25 / ISO 8677 7.2
M12	dk	DIN 603 30.65 / ISO 8677 30
M12	dk	DIN 603 29.35 / ISO 8677 28.7
M12	k	DIN 603 6.95 / ISO 8677 6.8
M12	k	DIN 603 6.05 / ISO 8677 6
M12	v	DIN 603 11.3 / ISO 8678 11.82
M12	f	DIN 603 8.75 / ISO 8678 4
M12	f	DIN 603 7.25 / ISO 8678 3.2
M12	dk	DIN 603 30.65 / ISO 8678 26.6
M12	k	DIN 603 6.95 / ISO 8678 6.8
M12	k	DIN 603 6.05 / ISO 8678 6

Available products

DIN 603 Carriage Bolt | Round Head Square Neck Bolt

Stainless Steel, Carbon Steel

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