Execution standard reference

M20 x 80 Mushroom head square neck bolts — DIN 603 / ISO 8677 / ISO 8678

M20 x 80 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	2.5	20	19.16	20.84	19.16	15.9	14.1	46.8	45.2	11.05	9.95	-	46	52	65	-	-	-	-	-
ISO 8677	Historical	2.5	20.84	-	20.84	19.16	15.9	14.1	46	44.4	10.9	10	-	46	52	65	24.9	1.6	-	-	-
ISO 8678	Current	2.5	20	-	20.84	19.79	5	4.2	43	-	10.9	10	-	46	52	-	25.73	1.6	4.2	3	39.9

standardDIN 603

statusCurrent

P · mm2.5

bodyDiameterMax20

More dimensions

bodyDiameterMin19.16

neckWidthMax20.84

neckWidthMin19.16

neckHeightMax15.9

neckHeightMin14.1

headDiameterMax46.8

headDiameterMin45.2

headHeightMax11.05

headHeightMin9.95

threadLength-

b · mm46

b · mm52

b · mm65

cornerDistance-

rMax-

cMax-

cMin-

bearingDiameterMin-

standardISO 8677

statusHistorical

P · mm2.5

bodyDiameterMax20.84

More dimensions

bodyDiameterMin-

neckWidthMax20.84

neckWidthMin19.16

neckHeightMax15.9

neckHeightMin14.1

headDiameterMax46

headDiameterMin44.4

headHeightMax10.9

headHeightMin10

threadLength-

b · mm46

b · mm52

b · mm65

cornerDistance24.9

rMax1.6

cMax-

cMin-

bearingDiameterMin-

standardISO 8678

statusCurrent

P · mm2.5

bodyDiameterMax20

More dimensions

bodyDiameterMin-

neckWidthMax20.84

neckWidthMin19.79

neckHeightMax5

neckHeightMin4.2

headDiameterMax43

headDiameterMin-

headHeightMax10.9

headHeightMin10

threadLength-

b · mm46

b · mm52

b · mm-

cornerDistance25.73

rMax1.6

cMax4.2

cMin3

bearingDiameterMin39.9

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
M20	dₛ	DIN 603 20 / ISO 8677 20.84
M20	dk	DIN 603 46.8 / ISO 8677 46
M20	dk	DIN 603 45.2 / ISO 8677 44.4
M20	k	DIN 603 11.05 / ISO 8677 10.9
M20	k	DIN 603 9.95 / ISO 8677 10
M20	v	DIN 603 19.16 / ISO 8678 19.79
M20	f	DIN 603 15.9 / ISO 8678 5
M20	f	DIN 603 14.1 / ISO 8678 4.2
M20	dk	DIN 603 46.8 / ISO 8678 43
M20	k	DIN 603 11.05 / ISO 8678 10.9
M20	k	DIN 603 9.95 / ISO 8678 10

Available products

Mushroom Head Square Neck Bolts

Carbon Steel, Stainless Steel

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