Execution standard reference

M8 x 40 Mushroom head square neck bolts — DIN 603 / ISO 8677 / ISO 8678

M8 x 40 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	1.25	8	7.42	8.58	7.42	5.6	4.4	20.65	19.35	4.88	4.12	-	22	28	41	-	-	-	-	-
ISO 8677	Historical	1.25	8.58	-	8.58	7.42	5.6	4.4	20	18.7	4.8	4	-	22	28	41	9.6	0.8	-	-	-
ISO 8678	Current	1.25	8	-	8.58	7.85	3	2.4	18	-	4.8	4	-	22	-	-	10.2	0.8	2.2	1.2	15.8

standardDIN 603

statusCurrent

P · mm1.25

bodyDiameterMax8

More dimensions

bodyDiameterMin7.42

neckWidthMax8.58

neckWidthMin7.42

neckHeightMax5.6

neckHeightMin4.4

headDiameterMax20.65

headDiameterMin19.35

headHeightMax4.88

headHeightMin4.12

threadLength-

b · mm22

b · mm28

b · mm41

cornerDistance-

rMax-

cMax-

cMin-

bearingDiameterMin-

standardISO 8677

statusHistorical

P · mm1.25

bodyDiameterMax8.58

More dimensions

bodyDiameterMin-

neckWidthMax8.58

neckWidthMin7.42

neckHeightMax5.6

neckHeightMin4.4

headDiameterMax20

headDiameterMin18.7

headHeightMax4.8

headHeightMin4

threadLength-

b · mm22

b · mm28

b · mm41

cornerDistance9.6

rMax0.8

cMax-

cMin-

bearingDiameterMin-

standardISO 8678

statusCurrent

P · mm1.25

bodyDiameterMax8

More dimensions

bodyDiameterMin-

neckWidthMax8.58

neckWidthMin7.85

neckHeightMax3

neckHeightMin2.4

headDiameterMax18

headDiameterMin-

headHeightMax4.8

headHeightMin4

threadLength-

b · mm22

b · mm-

cornerDistance10.2

rMax0.8

cMax2.2

cMin1.2

bearingDiameterMin15.8

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
M8	dₛ	DIN 603 8 / ISO 8677 8.58
M8	dk	DIN 603 20.65 / ISO 8677 20
M8	dk	DIN 603 19.35 / ISO 8677 18.7
M8	k	DIN 603 4.88 / ISO 8677 4.8
M8	k	DIN 603 4.12 / ISO 8677 4
M8	v	DIN 603 7.42 / ISO 8678 7.85
M8	f	DIN 603 5.6 / ISO 8678 3
M8	f	DIN 603 4.4 / ISO 8678 2.4
M8	dk	DIN 603 20.65 / ISO 8678 18
M8	k	DIN 603 4.88 / ISO 8678 4.8
M8	k	DIN 603 4.12 / ISO 8678 4

Available products

DIN 603 Carriage Bolt | Round Head Square Neck Bolt

Stainless Steel, Carbon Steel

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