DIN 261 T Head Bolts

Table 1 — Dimensions (sizes M8 to M36) DIN 261 T Head Bolts

Thread size d		M8	M10	M12	M16	M20	M24	M30	M36
Thread size d		P^a		1,25	1,5	1,75	2	2,5	3	3,5	4
b Auxiliary dimension	b	22	26	30	38	46	54	66	78
	c	—	—	—	44	52	60	72	84
	d	—	—	—	57	65	73	85	97
d_b		—	—	—	—	—	—	—	M 12
d_s^e	max.	8,58	10,58	12,70	16,70	20,84	24,84	30,84	37,00
d_s^e	min.	7,42	9,42	11,30	15,30	19,16	23,16	29,16	35,00
k	Nom. size	5,5	7	8	10,5	13	15	19	23
	max.	5,9	7,5	8,75	11,4	13,9	15,9	20	24
	min.	5,1	6,5	7,25	9,6	12,1	14,1	18	22
n	Nom. size	8	10	12	16	20	24	30	36
	max.	8,75	10,75	12,90	16,90	21,00	25,00	31,00	37,25
	min.	7,25	9,25	11,10	15,10	19,00	23,00	29,00	34,75
m	Nom. size	18	21	26	30	36	43	54	66
	max.	18,90	22,00	27,00	31,00	37,25	44,25	55,50	67,50
	min.	17,10	20,00	25,00	29,00	35,75	41,75	52,50	64,50
r_min	≈	0,4	0,4	0,6	0,6	0,8	0,8	1	1
d_a^f	max.	10,2	12,2	14,7	18,7	24,4	28,4	35,4	42,4
t	min.	—	—	—	—	—	—	—	22

l			Shank lengths l_s and l_g
Nominal size	l		l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g
	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
30	28,95	31,05	—	8	—	9
(35)	33,75	36,25	6,75	13	—	9
40	38,75	41,25	11,75	18	6,5	14
(45)	43,75	46,25	16,75	23	11,5	19	6,25	15
50	48,75	51,25	21,75	28	16,5	24	11,25	20	—	5
(55)	53,5	56,5	26,75	33	21,5	29	16,25	25	7	17
60	58,5	61,5	31,75	38	26,5	34	21,25	30	12	22	—	6
(65)	63,5	66,5	36,75	43	31,5	39	26,25	35	17	27	6,5	19
70	68,5	71,5	41,75	48	36,5	44	31,25	40	22	32	11,5	24	—	7,5
(75)	73,5	76,5	46,75	53	41,5	49	36,25	45	27	37	16,5	29	6	21
80	78,5	81,5	51,75	58	46,5	54	41,25	50	32	42	21,5	34	11	26
90	88,25	91,75			56,5	64	51,25	60	42	52	31,5	44	21	36	6,5	24
100	98,25	101,75			66,5	74	61,25	70	52	62	41,5	54	31	46	16,5	34
(110)	108,25	111,75					71,25	80	62	72	51,5	64	41	56	26,5	44
120	118,25	121,75					81,25	90	72	82	55,5	68	45	60	36,5	54	22	42
(130)	128	132							76	86	65,5	78	55	70	40,5	58	26	46
140	138	142							86	96	75,5	88	65	80	50,5	68	36	56
(150)	148	152							96	106	85,5	98	75	90	60,5	78	46	66
160	156	165							106	116	95,5	108	85	100	70,5	88	56	76
(170)	166	172									105,5	118	95	110	80,5	98	66	86
180	176	184									115,5	128	105	120	90,5	108	76	96
(190)	185,4	194,6									125,5	138	115	130	100,5	118	86	106
200	195,4	204,6									135,5	148	125	140	110,5	128	96	116
Bracketed sizes should be avoided if possible. T-head bolts are generally manufactured in the sizes for which a shank length has been specified. Bolts with nominal lengths below the dashed line have values of l_g and l_s in accordance with the following equations: l_{g max.} = l (nominal length) − b (auxiliary dimension); l_{s min.} = l_{g max.} − 5P.
^a P = pitch of thread (coarse pitch thread) ^b For l ≤ 120 mm ^c For 120 mm < l ≤ 200 mm ^d For l > 200 mm ^e Diameter of unthreaded shank portion, d_s, can be equal to pitch diameter. ^f The inner diameter of the bearing face d_a is the diameter of the circle measured at the point of intersection between the transition radius below the bolt head r and the head bearing face.

Table 2 — Dimensions (sizes M8 to M36) DIN 261 T Head Bolts

Thread size d	M42	M48	M56	M64	M72 × 6	M80 × 6	M90 × 6	M100 × 6
P^a	4,5	5	5,5	6	6	6	6	6
b Auxiliary dimension	90	—	—	—	—	—	—	—
^c	96	108	124	130	—	—	—	—
^d	109	121	137	143	169	185	205	225
d_b	M 12	M 12	M 16	M 16	M 16	M 20	M 20	M 20
d_s^e max.	34,0	38,0	45,0	50,0	55,0	65,0	70,0	80,0
min.	33,0	37,0	44,0	49,0	53,8	63,8	68,8	78,8
k Nom. size	26	30	35	40	45	50	55	62
max.	27,00	31,00	36,25	41,25	46,25	51,25	56,50	63,50
min.	25,00	29,00	33,75	38,75	43,75	48,75	53,50	60,50
n Nom. size	42	48	56	64	72	80	90	100
max.	43,25	49,25	57,50	65,50	73,50	81,50	91,75	101,75
min.	40,75	46,75	54,50	62,50	70,50	78,50	88,25	98,25
m Nom. size	80	88	102	115	128	140	155	170
max.	81,50	89,75	103,75	116,75	130,00	142,00	157,00	172,00
min.	78,50	86,25	100,25	113,25	126,00	138,00	153,00	168,00
r_min ≈	1,2	1,6	2	2	2	2	2,5	2,5
d_a^f max.	48,6	56,6	67,0	75,0	83,0	92,0	102,0	113,0
t min.	22	22	26	26	26	33	33	33

l			Shank lengths l_s and l_g
Nom. size	l		l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g	l_s	l_g
Nom. size	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
120	118,25	121,75	6,5	30
(130)	128	132	11,5	34
140	138	142	21,5	44
(150)	148	152	31,5	54	17	42
160	156	164	41,5	64	27	52
(170)	166	174	51,5	74	37	62
180	176	184	61,5	84	47	72	28,5	56
(190)	185,4	194,6	71,5	94	57	82	38,5	66
200	195,4	204,6	81,5	104	67	92	48,5	76	40	70
220	215,4	224,6	88,5	111	74	99	55,5	83	47	77
240	235,4	244,6	108,5	131	94	119	75,5	103	67	97
260	254,8	265,2	128,5	151	114	139	95,5	123	87	117	61	91
280	274,8	285,2	148,5	171	134	159	115,5	143	107	137	81	111	65	95
300	294,8	305,2	168,5	191	154	179	135,5	163	127	157	101	131	85	115
320	314,3	325,7	188,5	211	174	199	155,5	183	147	177	121	151	105	135	85	115
340	334,3	345,7	208,5	231	194	219	175,5	203	167	197	141	171	125	155	105	135
360	354,3	365,7	228,5	251	214	239	195,5	223	187	217	161	191	145	175	125	155	105	135
380	374,3	385,7	248,5	271	234	259	215,5	243	207	237	181	211	165	195	145	175	125	155
400	394,3	405,7	268,5	291	254	279	235,5	263	227	257	201	231	185	215	165	195	145	175
Bracketed sizes should be avoided if possible. T-head bolts are generally manufactured in the sizes for which a shank length has been specified. Bolts with nominal lengths below the dashed line have values of l_g and l_s in accordance with the following equations: l_{g max.} = l (nominal length) − b (auxiliary dimension); l_{s min.} = l_{g max.} − 5P.
^a P = pitch of thread (coarse pitch thread) ^b For l ≤ 120 mm ^c For 120 mm < l ≤ 200 mm ^d For l > 200 mm ^e Diameter of unthreaded shank portion, d_s, can be equal to pitch diameter. ^f The inner diameter of the bearing face d_a is the diameter of the circle measured at the point of intersection between the transition radius below the bolt head r and the head bearing face.

Table 3 — Technical delivery conditions

Material		Steel
General requirements		DIN ISO 8992
Thread	Tolerance class	8 g
Thread	Standard	DIN ISO 965-1
Mechanical properties	Property class^a (material)	≤ M39: 4.6 or 5.6, at the manufacturer’s discretion > M39: subject to agreement
Mechanical properties	Standard	DIN EN ISO 898-1
Limit deviations and geometrical tolerances	Product grade	C
Limit deviations and geometrical tolerances	Standard	DIN EN ISO 4759-1
Surface finish		As processed. DIN EN ISO 4042 applies with regard to electroplating. DIN EN ISO 10684 applies with regard to hot dip galvanizing.
Acceptance inspection		DIN EN ISO 3269 applies with regard to acceptance inspection.
^a Other property classes or materials shall be subject to agreement.