Jade Alloys publishes this ISO 4014 dimensions chart to sit alongside our existing ISO 4014 standards reference, giving buyers, draughtsmen, and quality teams the complete worked size chart in one place rather than a bare table of numbers. ISO 4014 covers hexagon head bolts with a shank, meaning the bolt is only partially threaded, with a smooth, unthreaded section of shank running from under the head down to where the thread begins. If you need the short standard overview first, our ISO 4014 standards page covers the scope and history of the standard itself.
The tables below cover the full range from M1.6 to M48 for ISO 4014 hex bolts, along with product grade, thread length, weight reference and the standards most often compared to ISO 4014.
What Is ISO 4014?
ISO 4014 is the international standard covering hexagon head bolts with a shank, produced in metric sizes from M1.6 up to M64. The defining feature of the standard is the shank itself, the smooth, unthreaded length of the bolt body sitting just below the head, which is longer than on a fully threaded screw and gives the joint a defined bearing surface to work against. This is the main practical difference between ISO 4014 and its close relative ISO 4017, which covers the same head style but with the thread running the full length of the bolt. ISO 4014 bolts are produced in property classes such as 8.8, 10.9 and 12.9, and in stainless steel to ISO 3506 1, giving a wide range of strength and corrosion resistance options for the same dimensional standard.
Product Grade A and B Explained
ISO 4014 dimension tables distinguish between product grade A and product grade B, based on bolt diameter and length.
- Grade A: Generally applies to smaller sizes up to and including M24, within the specified length limits, with tighter dimensional tolerances.
- Grade B: Applies to larger diameters and longer bolts outside the grade A range, with wider dimensional tolerances.
When ordering, confirm the bolt diameter, length, thread specification, material and product grade, particularly where dimensional tolerances are critical. For specialised environments, alternatives such as Hastelloy C276 fasteners may also be considered.
ISO 4014 Dimensions Chart
The table below gives the core head and shank dimensions for the most commonly ordered ISO 4014 sizes, in millimetres. Figures have been checked against the current standard rather than taken directly from any single published source, since published charts do not always agree with each other at the same nominal size.
|
Nominal |
Pitch of thread P |
Width across corners e |
Width across flats |
Thickness of head k |
Thread Length b |
Transition Diameter da |
Dia. of washer face dw |
Diameter of unthreaded shank |
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 |
Bolt 125-200 |
Bolt |
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 |
Hex Bolt Length Tolerance of ISO 4014
| Nominal Length, l (mm) | Product Grade A Min. (mm) | Product Grade A Max. (mm) | Product Grade B Min. (mm) | Product Grade B Max. (mm) |
| 12 | 11.65 | 12.35 | ||
| 16 | 15.65 | 16.35 | ||
| 20 | 19.58 | 20.42 | 18.95 | 21.05 |
| 25 | 24.58 | 25.42 | 23.95 | 26.05 |
| 30 | 29.58 | 30.42 | 28.95 | 31.05 |
| 35 | 34.50 | 35.50 | 33.75 | 36.25 |
| 40 | 39.50 | 40.50 | 38.75 | 41.25 |
| 45 | 44.50 | 45.50 | 43.75 | 46.25 |
| 50 | 49.50 | 50.50 | 48.75 | 51.25 |
| 55 | 54.40 | 55.60 | 53.50 | 56.50 |
| 60 | 59.40 | 60.60 | 58.50 | 61.50 |
| 65 | 64.40 | 65.60 | 63.50 | 66.50 |
| 70 | 69.40 | 70.60 | 68.50 | 71.50 |
| 80 | 79.40 | 80.60 | 78.50 | 81.50 |
| 90 | 89.30 | 90.70 | 88.25 | 91.75 |
| 100 | 99.30 | 100.70 | 98.25 | 101.75 |
| 110 | 109.30 | 110.70 | 108.25 | 111.75 |
| 120 | 119.30 | 120.70 | 118.25 | 121.75 |
| 130 | 129.20 | 130.80 | 128.00 | 132.00 |
| 140 | 139.20 | 140.80 | 138.00 | 142.00 |
| 150 | 149.20 | 150.80 | 148.00 | 152.00 |
| 160 | 158.00 | 162.00 | ||
| 180 | 178.00 | 182.00 | ||
| 200 | 197.70 | 202.30 | ||
| 220 | 217.70 | 222.30 | ||
| 240 | 237.70 | 242.30 | ||
| 260 | 257.40 | 262.60 | ||
| 280 | 277.40 | 282.60 | ||
| 300 | 297.40 | 302.60 | ||
| 320 | 317.15 | 322.85 | ||
| 340 | 337.15 | 342.85 | ||
| 360 | 357.15 | 362.85 | ||
| 380 | 377.15 | 382.85 | ||
| 400 | 397.15 | 402.85 | ||
| 420 | 416.85 | 423.15 | ||
| 440 | 436.85 | 443.15 | ||
| 460 | 456.85 | 463.15 | ||
| 480 | 476.85 | 483.15 | ||
| 500 | 496.85 | 503.15 |
ISO 4014 Weight Reference
Weight is not part of the ISO 4014 dimensional standard itself, but it is one of the first things a buyer needs once a size has been confirmed, for costing and freight purposes. ISO 4014 bolt weight follows the same shank volume calculation used across our other bolt weight charts, and the full metric range in kilograms per piece and per 100 pieces is available on our bolt weight chart. Bolts made to ISO 4014 and to ASME B18.2.3.5M share very close dimensions at most common sizes, so figures on that chart are a reliable reference for either standard at the sizes they have in common.
ISO 4014 Equivalent Standards
ISO 4014 sits within a small family of closely related and easily confused standards. The table below sets out the most relevant ones and how each relates to ISO 4014.
| Standard | Relationship to ISO 4014 |
| DIN 931 | The historical German standard that ISO 4014 has largely superseded in European specifications. The two describe a very similar hexagon head bolt with shank, dimensionally close at most sizes, though a drawing should always state which standard actually applies. |
| ISO 4017 | Same head style and size range as ISO 4014, but fully threaded along its whole length, with no shank. Choose ISO 4017 where the joint does not need a defined unthreaded bearing surface. |
| ASME B18.2.3.5M | The closest metric ASME equivalent, covering metric hex bolts to American practice, with minor differences in head dimensions and washer face detail compared with ISO 4014. |
Jade Alloys also publishes a DIN 933 standards reference for the full thread equivalent, useful if a full thread option better suits your application.
| Need the complete ISO 4014 chart to keep on fileDownload a printable PDF version of the full ISO 4014 dimensions chart, covering the complete M1.6 to M64 range and length tolerances, or contact Jade Alloys directly for a bolt quotation to your specification.Browse our catalogue or contact our team |
Frequently Asked Questions
1. What does ISO 4014 cover?
2. What is the difference between ISO 4014 and ISO 4017?
3. What is the difference between product grade A and B?
4. What is the difference between ISO 4014 and DIN 931?
5. What size range does ISO 4014 cover?
6. How is ISO 4014 bolt weight calculated?
7. Is ISO 4014 the same as a stainless steel hex bolt?
| Source ISO 4014 hex bolts to any size and gradeJade Alloys manufactures and exports ISO 4014 hex bolts across the full metric range, in carbon steel, alloy steel and stainless steel, with full mill test certification on every order.Browse our catalogue or contact our team |
Explore Related Charts
For related reference material, see our ISO 4014 standards overview, our guide to measuring hex bolt dimensions, our bolt weight chart and our thread pitch chart.
About Jade Alloys
Jade Alloys is a Mumbai based manufacturer and exporter of industrial fasteners, supplying hex bolts, hex nuts, stud bolts and washers in carbon steel, alloy steel and stainless steel to ISO, ASTM, ASME and equivalent international standards. Every order is supplied with full mill test certification. Contact our technical sales team to discuss your requirements.
