DINCurrentDraft · single source

DIN 261

T-head bolts

National equivalents

PN 82424

Head · drive: T-head / hammer head · No drive
Thread: Metric ISO coarse thread
Tolerance: 6g
Property classes: 4.68.810.9
Materials: Steel

Dimensions

mm · values as the standard states them

Size	P	ds	m	k	b120 < l ≤ 200	bl > 200	bl ≤ 120	r	t	n	db
M8	1.25	7.42 – 8.58	18 17.1 – 18.9	5.5 5.1 – 5.9	—	—	22	≈ 0.5	—	8 7.25 – 8.75	—
M10	1.5	9.42 – 10.58	21 20 – 22	7 6.5 – 7.5	—	—	26	≈ 0.5	—	10 9.25 – 10.75	—
M12	1.75	11.3 – 12.7	26 25 – 27	8 7.25 – 8.75	—	—	30	≈ 1	—	12 11.1 – 12.9	—
M16	2	15.3 – 16.7	30 29 – 31	10.5 9.6 – 11.4	44	—	38	≈ 1	—	16 15.1 – 16.9	—
M20	2.5	19.16 – 20.84	36 35.75 – 37.25	13 12.1 – 13.9	52	—	46	≈ 1	—	20 19 – 21	—
M24	3	23.16 – 24.84	43 41.75 – 44.25	15 14.1 – 15.9	60	—	54	≈ 1.6	—	24 23 – 25	—
M30	3.5	29.16 – 30.84	54 52.5 – 55.5	19 18 – 20	72	—	66	≈ 1.6	—	30 29 – 31	—
M36	4	35 – 37	66 64.5 – 67.5	23 22 – 24	84	—	78	≈ 2	≥ 22	36 34.75 – 37.25	M12
M42	4.5	—	80 78.5 – 81.5	26 25 – 27	96	109	90	≈ 2	≥ 22	42 40.75 – 43.25	M12
M48	5	37 – 38	88 86.25 – 89.75	30 29 – 31	108	121	—	≈ 2	≥ 22	48 46.75 – 49.25	M12
M56	5.5	44 – 45	102 100.25 – 103.75	35 33.75 – 36.25	124	137	—	≈ 3	≥ 26	56 54.5 – 57.5	M16
M64	6	49 – 50	115 113.25 – 116.75	40 38.75 – 41.25	130	143	—	≈ 3	≥ 26	64 62.5 – 65.5	M16
M72x6	6	53.8 – 55	128 126 – 130	45 43.75 – 46.25	—	169	—	≈ 4	≥ 26	72 70.5 – 73.5	M16
M80x6	6	63.8 – 65	140 138 – 142	50 48.75 – 51.25	—	185	—	≈ 4	≥ 33	80 78.5 – 81.5	M20
M90x6	6	68.8 – 70	155 153 – 157	55 53.5 – 56.5	—	205	—	≈ 4	≥ 33	90 88.25 – 91.75	M20
M100x6	6	78.8 – 80	170 168 – 172	62 60.5 – 63.5	—	225	—	≈ 5	≥ 33	100 98.25 – 101.75	M20

Ranges read min – max; ≤ / ≥ where the standard gives one limit, ≈ for approximate values. Sizes in (brackets) are non-preferred. Select a row for its size sheet.

Length tolerances

3028.95 – 31.05

3533.75 – 36.25

4038.75 – 41.25

4543.75 – 46.25

5048.75 – 41.25

5553.5 – 56.5

6058.5 – 61.5

6563.5 – 66.5

7068.5 – 71.5

7573.5 – 76.5

8078.5 – 81.5

9088.25 – 91.75

10098.25 – 101.75

110108.25 – 111.75

120118.25 – 121.75

130128 – 132

140138 – 142

150148 – 152

160156 – 164

170166 – 174

180176 – 184

190185.4 – 194.6

200195.4 – 204.6

220215.4 – 224.6

240235.4 – 244.6

260254.8 – 265.2

280274.8 – 285.2

300294.8 – 305.2

320314.3 – 325.7

340334.3 – 345.7

360254.3 – 365.7

380374.3 – 385.7

400394.3 – 405.7

Size sheet · DIN 261

M10

ds: shank diameter; 9.42 – 10.58
m: head width; 21
k: head height; 7
b: thread length (l ≤ 120); 26
r: fillet radius; ≈ 0.5
n: thickness of the mounting collar; 10

Thread · ISO 261/262

Pitch P: 1.5
d2: 9.026
d3: 8.16
Tap drill: 8.5
Stress area A_s: 57.99 mm²

Standard lengths

30 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100

Provenance

Draft — values taken from a single source and not yet cross-checked.

fasteners.eudimensions, lengths, materials, property classes, current norm, equivalent norms

Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.

Data notes (1)

1 value(s) omitted after consistency checks: M42 ds: value 34 breaks the size progression — omitted as a probable source typo

Same product type

DIN 186 — T-head bolts with square neck DIN 188 — T-head bolts with double nip DIN 7992 — T-head bolts with large head All 4 standards of this type →

Dimensions

Length tolerances

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