DIN 931 Bolt Dimension

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DIN 931 Bolt Dimension

DIN 931 - Bolt Dimension

Dimensional Standard of Bolts per DIN 931

• For hot-dip galvanized nuts, the dimensions apply before galvanizing.
• P is the pitch of thread.
• dw, max. = actual
• β = 15⁰ to 30⁰
• Incomplete thread u = 2P

Nominal	Pitch of thread P	Width across corners e	Width across flats s		Thickness of head k		Thread Length b			Transition Diameter da	Dia. of washer face dw	Diameter of unthreaded shank ds		Radius under head r	Depth of washer face c		Major Diameter (D)		Pitch Diameter (D1)		Minor Diameter (D2)
Nominal	Pitch of thread P	Width across corners e	Width across flats s		Thickness of head k		Thread Length b			Transition Diameter da	Dia. of washer face dw	Diameter of unthreaded shank ds		Radius under head r	Depth of washer face c		Major Diameter (D)		Pitch Diameter (D1)		Minor Diameter (D2)
	MM	Min.	Min.	Max.	Min.	Max.	Bolt ≤125	Bolt 125-200	Bolt ≥200	Max.	Min.	Min.	Max.	Min.	Min.	Max.	Min.	Min.	Min.	Max.	Max.
M-16	2.0	26.17	23.16	24	9.71	10.29	38	44	57	17.70	22.00	15.57	16	0.6	0.2	0.8	15.68	15.96	14.50	14.60	13.80
M-18	2.5	29.56	26.16	27	11.15	11.85	42	48	61	20.20	24.85	17.57	18	0.6	0.2	0.8	17.62	17.96	16.15	16.25	15.25
M-20	2.5	32.95	29.16	30	12.15	12.85	46	52	65	22.40	27.70	19.48	20	0.8	0.2	0.8	19.62	19.96	18.15	18.25	17.25
M-22	2.5	37.29	33.00	34	13.65	14.35	50	56	69	24.40	31.35	21.48	22	0.8	0.2	0.8	21.62	21.96	20.15	20.25	19.25
M-24	3.0	39.55	35.00	36	14.65	15.35	54	60	73	26.40	33.25	23.48	24	0.8	0.2	0.8	23.58	23.95	21.80	21.90	20.70
M-27	3.0	45.20	40.00	41	16.65	17.35	60	66	79	30.40	38.00	26.48	27	1.0	0.2	0.8	26.58	26.95	24.80	24.90	23.70
M-30	3.5	50.85	45.00	46	18.18	19.12	66	72	85	33.40	42.75	29.48	30	1.0	0.2	0.8	29.52	29.95	27.50	27.60	26.16
M-33	3.5	55.37	49.00	50	20.58	21.42	72	78	91	36.40	46.55	32.38	33	1.0	0.2	0.8	32.52	32.95	30.50	30.60	29.16
M-36	4.0	60.79	53.80	55	22.08	22.92	78	84	97	39.40	51.11	35.38	36	1.0	0.2	0.8	35.46	35.94	33.15	33.25	31.61
M-39	4.0	66.44	58.80	60	24.58	25.42	84	90	103	42.40	55.86	38.38	39	1.0	0.3	1.0	38.46	38.94	36.20	36.30	34.61
M-42	4.5	71.30	63.10	65	25.58	26.42	90	96	109	45.60	59.95	41.38	42	1.2	0.3	1.0	41.44	41.94	38.80	38.90	37.07
M-45	4.5	76.95	68.10	70	27.58	28.42	96	102	115	48.60	64.70	44.38	45	1.2	0.3	1.0	44.44	44.94	41.80	41.90	40.07
M-48	5.0	82.60	73.10	75	29.58	30.42	102	108	121	52.60	69.45	47.38	48	1.6	0.3	1.0	47.40	47.93	44.50	44.60	42.52
M-52	5.0	88.25	78.10	80	32.50	33.50	110	116	129	56.60	74.20	51.26	52	1.6	0.3	1.0	51.40	51.93	48.50	48.60	46.52
M-56	5.5	93.56	82.80	85	34.50	35.50	118	124	137	63.00	78.66	55.26	56	2.0	0.3	1.0	55.36	55.92	52.10	52.20	49.97
M-60	5.5	99.21	87.80	90	37.50	38.50	-	132	145	67.00	83.41	59.26	60	2.0	0.3	1.0	59.36	59.92	57.85	57.95	53.97
M-64	6.0	104.86	92.80	95	39.50	40.50	-	140	153	71.00	88.16	63.26	64	2.0	0.3	1.0	63.32	63.92	59.80	59.90	57.42

Bolt Shank Length Ls & Lg

L	Total Length	Total Length	M-16		M-18		M-20		M-22		M-24		M-27		M-30		M-33		M-36
Nominal length	Min.	Max.	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg
Nominal length	Min.	Max.	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*

70	68.50	71.50	22.00	32.00	15.50	28.00	11.50	24.00	-	-	-	-	-	-	-	-	-	-	-	-
80	78.50	81.50	32.00	42.00	25.50	38.00	21.50	34.00	-	-	-	-	-	-	-	-	-	-	-	-
90	88.25	91.75	42.00	52.00	35.50	48.00	31.50	44.00	27.50	40.00	21.00	36.00	-	-	-	-	-	-	-	-
100	98.25	101.75	52.00	62.00	45.50	58.00	41.50	54.00	37.50	50.00	31.00	46.00	25.00	40.00	16.50	34.00	-	-	-	-
110	108.25	111.75	62.00	72.00	55.50	68.00	51.50	64.00	47.50	60.00	41.00	56.00	35.00	50.00	26.50	44.00	-	-	-	-
120	118.25	121.75	72.00	82.00	65.50	78.00	61.50	74.00	57.50	70.00	51.00	66.00	45.00	60.00	36.50	54.00	-	-	-	-
130	128.00	132.00	76.00	86.00	69.50	82.00	65.50	78.00	61.50	74.00	78.00	55.00	49.00	64.00	40.50	58.00	34.50	52.00	26.00	46.00
140	138.00	142.00	86.00	96.00	79.50	92.00	75.50	88.00	71.50	84.00	88.00	65.00	59.00	74.00	50.50	68.00	44.50	62.00	36.00	56.00
150	148.00	152.00	96.00	106.00	89.50	102.00	85.50	98.00	81.50	94.00	98.00	75.00	69.00	84.00	60.50	78.00	54.50	72.00	46.00	66.00
160	158.00	162.00	106.00	116.00	99.50	112.00	95.50	108.00	91.50	104.00	108.00	85.00	79.00	94.00	70.50	88.00	64.50	82.00	56.00	76.00
170	168.00	172.00	116.00	126.00	109.50	122.00	105.50	118.00	101.50	114.00	118.00	95.00	89.00	104.00	80.50	98.00	74.50	92.00	66.00	86.00
180	178.00	182.00	126.00	136.00	119.50	132.00	115.50	128.00	111.50	124.00	128.00	105.00	99.00	114.00	90.50	108.00	84.50	102.00	76.00	96.00
190	188.00	192.00	136.00	146.00	129.50	142.00	125.50	138.00	121.50	134.00	138.00	115.00	109.00	124.00	100.50	118.00	94.50	112.00	86.00	106.00
200	197.70	202.30	146.00	156.00	139.50	152.00	135.50	148.00	131.50	144.00	148.00	125.00	119.00	134.00	110.50	128.00	104.50	122.00	96.00	116.00
210	207.70	212.30	153.00	154.00	136.50	149.00	132.50	145.00	128.50	141.00	122.00	137.00	116.00	131.00	107.50	125.00	101.50	119.00	93.00	113.00
220	217.70	222.30	163.00	164.00	146.50	159.00	142.50	155.00	138.50	151.00	132.00	147.00	126.00	141.00	117.50	135.00	111.50	129.00	103.00	123.00
230	227.70	232.30	173.00	174.00	156.50	169.00	152.50	165.00	148.50	161.00	142.00	157.00	136.00	151.00	127.50	145.00	121.50	139.00	113.00	133.00
240	237.70	242.30	183.00	184.00	166.50	179.00	162.50	175.00	158.50	171.00	152.00	167.00	146.00	161.00	137.50	155.00	131.50	149.00	123.00	143.00
250	247.70	252.30	193.00	194.00	176.50	189.00	172.50	185.00	168.50	181.00	162.00	177.00	156.00	171.00	147.50	165.00	141.50	159.00	133.00	153.00
260	257.40	262.60	203.00	204.00	186.50	199.00	182.50	195.00	178.50	191.00	172.00	187.00	166.00	181.00	157.50	175.00	151.50	169.00	143.00	163.00
270	267.40	272.60	213.00	214.00	196.50	209.00	192.50	205.00	188.50	201.00	182.00	197.00	176.00	191.00	167.50	185.00	161.50	179.00	153.00	173.00
280	277.40	282.60	223.00	224.00	206.50	219.00	202.50	215.00	198.50	211.00	192.00	207.00	186.00	201.00	177.50	195.00	171.50	189.00	163.00	183.00
290	287.40	292.60	233.00	234.00	216.50	229.00	212.50	225.00	208.50	221.00	202.00	217.00	196.00	211.00	187.50	205.00	181.50	199.00	173.00	193.00
300	297.40	302.60	243.00	244.00	226.50	239.00	222.50	235.00	218.50	231.00	212.00	227.00	206.00	221.00	197.50	215.00	191.50	209.00	183.00	203.00
310	307.40	312.60	253.00	254.00	236.50	249.00	232.50	245.00	228.50	241.00	222.00	237.00	216.00	231.00	207.50	225.00	201.50	219.00	193.00	213.00
320	317.15	322.85	263.00	264.00	246.50	259.00	242.50	255.00	238.50	251.00	232.00	247.00	226.00	241.00	217.50	235.00	211.50	229.00	203.00	223.00
330	327.15	332.85	273.00	274.00	256.50	269.00	252.50	265.00	248.50	261.00	242.00	257.00	236.00	251.00	227.50	245.00	221.50	239.00	213.00	233.00
340	337.15	342.85	283.00	284.00	266.50	279.00	262.50	275.00	258.50	271.00	252.00	267.00	246.00	261.00	237.50	255.00	231.50	249.00	223.00	243.00
350	347.15	352.85	293.00	294.00	276.50	289.00	272.50	285.00	268.50	281.00	262.00	277.00	256.00	271.00	247.50	265.00	241.50	259.00	233.00	253.00
360	357.15	362.85	303.00	304.00	286.50	299.00	282.50	295.00	278.50	291.00	272.00	287.00	266.00	281.00	257.50	275.00	251.50	269.00	243.00	263.00
370	367.15	372.85	313.00	314.00	296.50	309.00	292.50	305.00	288.50	301.00	282.00	297.00	276.00	291.00	267.50	285.00	261.50	279.00	253.00	273.00
380	377.15	382.85	323.00	324.00	306.50	319.00	302.50	315.00	298.50	311.00	292.00	307.00	286.00	301.00	277.50	295.00	271.50	289.00	263.00	283.00
390	387.15	392.85	333.00	334.00	316.50	329.00	312.50	325.00	308.50	321.00	302.00	317.00	296.00	311.00	287.50	305.00	281.50	299.00	273.00	293.00
400	397.15	402.85	343.00	344.00	326.50	339.00	322.50	335.00	318.50	331.00	312.00	327.00	306.00	321.00	297.50	315.00	291.50	309.00	283.00	303.00
410	407.15	412.85	353.00	354.00	336.50	349.00	332.50	345.00	328.50	341.00	322.00	337.00	316.00	331.00	307.50	325.00	301.50	319.00	293.00	313.00
420	416.85	423.15	363.00	364.00	346.50	359.00	342.50	355.00	338.50	351.00	332.00	347.00	326.00	341.00	317.50	335.00	311.50	329.00	303.00	323.00
430	426.85	433.15	373.00	374.00	356.50	369.00	352.50	365.00	348.50	361.00	342.00	357.00	336.00	351.00	327.50	345.00	321.50	339.00	313.00	333.00
440	436.85	443.15	383.00	384.00	366.50	379.00	362.50	375.00	358.50	371.00	352.00	367.00	346.00	361.00	337.50	355.00	331.50	349.00	323.00	343.00
450	446.85	453.15	393.00	394.00	376.50	389.00	372.50	385.00	368.50	381.00	362.00	377.00	356.00	371.00	347.50	365.00	341.50	359.00	333.00	353.00
460	456.85	463.15	403.00	404.00	386.50	399.00	382.50	395.00	378.50	391.00	372.00	387.00	366.00	381.00	357.50	375.00	351.50	369.00	343.00	363.00
470	466.85	473.15	413.00	414.00	396.50	409.00	392.50	405.00	388.50	401.00	382.00	397.00	376.00	391.00	367.50	385.00	361.50	379.00	353.00	373.00
480	476.85	483.15	423.00	424.00	406.50	419.00	402.50	415.00	398.50	411.00	392.00	407.00	386.00	401.00	377.50	395.00	371.50	389.00	363.00	383.00
490	486.85	493.15	433.00	434.00	416.50	429.00	412.50	425.00	408.50	421.00	402.00	417.00	396.00	411.00	387.50	405.00	381.50	399.00	373.00	393.00
500	496.85	503.15	443.00	444.00	426.50	439.00	422.50	435.00	418.50	431.00	412.00	427.00	406.00	421.00	397.50	415.00	391.50	409.00	383.00	403.00

L	Total Length	Total Length	M-39		M-42		M-45		M-48		M-52		M-56		M-60		M-64
Nominal length	Min.	Max.	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg	Ls	Lg
Nominal length	Min.	Max.	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*	*min.*	*max.*

70	68.50	71.50	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
80	78.50	81.50	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
90	88.25	91.75	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
100	98.25	101.75	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
110	108.25	111.75	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
120	118.25	121.75	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
130	128.00	132.00	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
140	138.00	142.00	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
150	148.00	152.00	40.00	60.00	-	-	-	-	-	-	-	-	-	-	-	-	-	-
160	158.00	162.00	50.00	70.00	41.50	64.00	-	-	-	-	-	-	-	-	-	-	-	-
170	168.00	172.00	60.00	80.00	51.50	74.00	-	-	-	-	-	-	-	-	-	-	-	-
180	178.00	182.00	70.00	90.00	61.50	84.00	55.50	78.00	47.00	72.00	-	-	-	-	-	-	-	-
190	188.00	192.00	80.00	100.00	71.50	94.00	65.50	88.00	57.00	82.00	-	-	-	-	-	-	-	-
200	197.70	202.30	90.00	110.00	81.50	104.00	75.50	98.00	67.00	92.00	59.00	84.00	-	-	-	-	-	-
210	207.70	212.30	87.00	107.00	78.50	101.00	72.50	95.00	74.00	99.00	56.00	81.00	45.50	73.00	37.50	65.00	27.00	57.00
220	217.70	222.30	97.00	117.00	88.50	111.00	82.50	105.00	84.00	109.00	66.00	91.00	55.50	83.00	47.50	75.00	37.00	67.00
230	227.70	232.30	107.00	127.00	98.50	121.00	92.50	115.00	94.00	119.00	76.00	101.00	65.50	93.00	57.50	85.00	47.00	77.00
240	237.70	242.30	117.00	137.00	108.50	131.00	102.50	125.00	104.00	129.00	86.00	111.00	75.50	103.00	67.50	95.00	57.00	87.00
250	247.70	252.30	127.00	147.00	118.50	141.00	112.50	135.00	114.00	139.00	96.00	121.00	85.50	113.00	77.50	105.00	67.00	97.00
260	257.40	262.60	137.00	157.00	128.50	151.00	122.50	145.00	124.00	149.00	106.00	131.00	95.50	123.00	87.50	115.00	77.00	107.00
270	267.40	272.60	147.00	167.00	138.50	161.00	132.50	155.00	134.00	159.00	116.00	141.00	105.50	133.00	97.50	125.00	87.00	117.00
280	277.40	282.60	157.00	177.00	148.50	171.00	142.50	165.00	144.00	169.00	126.00	151.00	115.50	143.00	107.50	135.00	97.00	127.00
290	287.40	292.60	167.00	187.00	158.50	181.00	152.50	175.00	154.00	179.00	136.00	161.00	125.50	153.00	117.50	145.00	107.00	137.00
300	297.40	302.60	177.00	197.00	168.50	191.00	162.50	185.00	164.00	189.00	146.00	171.00	135.50	163.00	127.50	155.00	117.00	147.00
310	307.40	312.60	187.00	207.00	178.50	201.00	172.50	195.00	174.00	199.00	156.00	181.00	145.50	173.00	137.50	165.00	127.00	157.00
320	317.15	322.85	197.00	217.00	188.50	211.00	182.50	205.00	184.00	209.00	166.00	191.00	155.50	183.00	147.50	175.00	137.00	167.00
330	327.15	332.85	207.00	227.00	198.50	221.00	192.50	215.00	194.00	219.00	176.00	201.00	165.50	193.00	157.50	185.00	147.00	177.00
340	337.15	342.85	217.00	237.00	208.50	231.00	202.50	225.00	204.00	229.00	186.00	211.00	175.50	203.00	167.50	195.00	157.00	187.00
350	347.15	352.85	227.00	247.00	218.50	241.00	212.50	235.00	214.00	239.00	196.00	221.00	185.50	213.00	177.50	205.00	167.00	197.00
360	357.15	362.85	237.00	257.00	228.50	251.00	222.50	245.00	224.00	249.00	206.00	231.00	195.50	223.00	187.50	215.00	177.00	207.00
370	367.15	372.85	247.00	267.00	238.50	261.00	232.50	255.00	234.00	259.00	216.00	241.00	205.50	233.00	197.50	225.00	187.00	217.00
380	377.15	382.85	257.00	277.00	248.50	271.00	242.50	265.00	244.00	269.00	226.00	251.00	215.50	243.00	207.50	235.00	197.00	227.00
390	387.15	392.85	267.00	287.00	258.50	281.00	252.50	275.00	254.00	279.00	236.00	261.00	225.50	253.00	217.50	245.00	207.00	237.00
400	397.15	402.85	277.00	297.00	268.50	291.00	262.50	285.00	264.00	289.00	246.00	271.00	235.50	263.00	227.50	255.00	217.00	247.00
410	407.15	412.85	287.00	307.00	278.50	301.00	272.50	295.00	274.00	299.00	256.00	281.00	245.50	273.00	237.50	265.00	227.00	257.00
420	416.85	423.15	297.00	317.00	288.50	311.00	282.50	305.00	284.00	309.00	266.00	291.00	255.50	283.00	247.50	275.00	237.00	267.00
430	426.85	433.15	307.00	327.00	298.50	321.00	292.50	315.00	294.00	319.00	276.00	301.00	265.50	293.00	257.50	285.00	247.00	277.00
440	436.85	443.15	317.00	337.00	308.50	331.00	302.50	325.00	304.00	329.00	286.00	311.00	275.50	303.00	267.50	295.00	257.00	287.00
450	446.85	453.15	327.00	347.00	318.50	341.00	312.50	335.00	314.00	339.00	296.00	321.00	285.50	313.00	277.50	305.00	267.00	297.00
460	456.85	463.15	337.00	357.00	328.50	351.00	322.50	345.00	324.00	349.00	306.00	331.00	295.50	323.00	287.50	315.00	277.00	307.00
470	466.85	473.15	347.00	367.00	338.50	361.00	332.50	355.00	334.00	359.00	316.00	341.00	305.50	333.00	297.50	325.00	287.00	317.00
480	476.85	483.15	357.00	377.00	348.50	371.00	342.50	365.00	344.00	369.00	326.00	351.00	315.50	343.00	307.50	335.00	297.00	327.00
490	486.85	493.15	367.00	387.00	358.50	381.00	352.50	375.00	354.00	379.00	336.00	361.00	325.50	353.00	317.50	345.00	307.00	337.00
500	496.85	503.15	377.00	397.00	368.50	391.00	362.50	385.00	364.00	389.00	346.00	371.00	335.50	363.00	327.50	355.00	317.00	347.00

NOTE : preferred lengths are defined in terms of ls and lg:
a) P is the pitch of the thread.
b) For l_nom u 125 mm.
c) For 125 mm <l_nom u 200 mm.
d) For l_nom>200 mm.
e) k_w,min= 0,7 k_min.
f) lg,_max= l_nom− b.
l_g,min= l_g,max− 5 P.

DIN 931 - Bolt Dimension

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