Engineering Data 2.2 / System C

ISO 4017 HEX HEAD SCREW — DIMENSIONS, GRADES & EQUIVALENTS

ISO 4017:2022 specifies hexagon head screws with metric coarse pitch threads from M1.6 to M64, in product grades A and B, made of steel or stainless steel. It is the current sixth edition of the standard (2022-06), replacing ISO 4017:2014, and it is the fully threaded counterpart of ISO 4014. The tables below are the standard’s own dimension tables, reproduced with the edition cited at the foot of this page.

1. Standard Identity

Standard

ISO 4017:2022 (6th edition, 2022-06)

Product grades

A and B

Thread range

M1.6 – M64, metric coarse

Status

Current; supersedes ISO 4017:2014

Fully threaded counterpart

ISO 4014 (partially threaded)

Dimensional equivalent

DIN 933

2. Dimensions — product grade A, M1.6 to M7

Table 1 — product grade A, M1.6 to M7
Parameter (mm)	M1.6	M2	M2.5	M3	M3.5	M4	M5	M6	M7
P — pitch (mm)	0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1
a — max	1.05	1.2	1.35	1.5	1.8	2.1	2.4	3	3
a — min	0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1
c — max	0.25	0.25	0.25	0.4	0.4	0.4	0.5	0.5	0.6
c — min	0.1	0.1	0.1	0.15	0.15	0.15	0.15	0.15	0.15
da — max	2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8
dw — min	2.54	3.34	4.34	4.84	5.34	6.2	7.2	8.88	9.63
e (across corners) — min	3.41	4.32	5.45	6.01	6.58	7.66	8.79	11.05	12.12
k — nominal	1.1	1.4	1.7	2	2.4	2.8	3.5	4	4.8
k — max	1.225	1.525	1.825	2.125	2.525	2.925	3.65	4.15	4.95
k — min	0.975	1.275	1.575	1.875	2.275	2.675	3.35	3.85	4.65
kw — min	0.68	0.89	1.1	1.31	1.59	1.87	2.35	2.7	3.26
r — min	0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.25
s (across flats) — nom. = max	3.2	4	5	5.5	6	7	8	10	11
s — min	3.02	3.82	4.82	5.32	5.82	6.78	7.78	9.78	10.73

Source: ISO 4017:2022(E), Table 1. Dimensions in millimetres. Bracketed sizes are non-preferred. “—” = not specified for that product grade.

3. Dimensions — product grade A, M8 to M24

Table 2 — product grade A, M8 to M24
Parameter (mm)	M8	M10	M12	M14	M16	M18	M20	M22	M24
P — pitch (mm)	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
a — max	3.75	4.5	5.25	6	6	7.5	7.5	7.5	9
a — min	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
c — max	0.6	0.6	0.6	0.6	0.8	0.8	0.8	0.8	0.8
c — min	0.15	0.15	0.15	0.15	0.2	0.2	0.2	0.2	0.2
da — max	9.2	11.2	13.7	15.7	17.7	20.2	22.4	24.4	26.4
dw — min	11.63	14.63	16.63	19.64	22.49	25.34	28.19	31.71	33.61
e (across corners) — min	14.38	17.77	20.03	23.36	26.75	30.14	33.53	37.72	39.98
k — nominal	5.3	6.4	7.5	8.8	10	11.5	12.5	14	15
k — max	5.45	6.58	7.68	8.98	10.18	11.715	12.715	14.215	15.215
k — min	5.15	6.22	7.32	8.62	9.82	11.285	12.285	13.785	14.785
kw — min	3.61	4.35	5.12	6.03	6.87	7.9	8.6	9.65	10.35
r — min	0.4	0.4	0.6	0.6	0.6	0.6	0.8	0.8	0.8
s (across flats) — nom. = max	13	16	18	21	24	27	30	34	36
s — min	12.73	15.73	17.73	20.67	23.67	26.67	29.67	33.38	35.38

Source: ISO 4017:2022(E), Table 2. Dimensions in millimetres. Bracketed sizes are non-preferred. “—” = not specified for that product grade.

4. Dimensions — product grade B, M16 to M36

Table 3 — product grade B, M16 to M36
Parameter (mm)	M16	M18	M20	M22	M24	M27	M30	M33	M36
P — pitch (mm)	2	2.5	2.5	2.5	3	3	3.5	3.5	4
a — max	6	7.5	7.5	7.5	9	9	10.5	10.5	12
a — min	2	2.5	2.5	2.5	3	3	3.5	3.5	4
c — max	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
c — min	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
da — max	17.7	20.2	22.4	24.4	26.4	30.4	33.4	36.4	39.4
dw — min	22	24.85	27.7	31.35	33.25	38	42.75	46.55	51.11
e (across corners) — min	26.17	29.56	32.95	37.29	39.55	45.2	50.85	55.37	60.79
k — nominal	10	11.5	12.5	14	15	17	18.7	21	22.5
k — max	10.29	11.85	12.85	14.35	15.35	17.35	19.12	21.42	22.92
k — min	9.71	11.15	12.15	13.65	14.65	16.65	18.28	20.58	22.08
kw — min	6.8	7.81	8.51	9.56	10.26	11.66	12.8	14.41	15.46
r — min	0.6	0.6	0.8	0.8	0.8	1	1	1	1
s (across flats) — nom. = max	24	27	30	34	36	41	46	50	55
s — min	23.16	26.16	29.16	33	35	40	45	49	53.8

Source: ISO 4017:2022(E), Table 3. Dimensions in millimetres. Bracketed sizes are non-preferred. “—” = not specified for that product grade.

5. Dimensions — product grade B, M39 to M64

Table 4 — product grade B, M39 to M64
Parameter (mm)	M39	M42	M45	M48	M52	M56	M60	M64
P — pitch (mm)	4	4.5	4.5	5	5	5.5	5.5	6
a — max	12	13.5	13.5	15	15	16.5	16.5	18
a — min	4	4.5	4.5	5	5	5.5	5.5	6
c — max	1	1	1	1	1	1	1	1
c — min	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3
da — max	42.4	45.6	48.6	52.6	56.6	63	67	71
dw — min	55.86	59.95	64.7	69.45	74.2	78.66	83.41	88.16
e (across corners) — min	66.44	71.3	76.95	82.6	88.25	93.56	99.21	104.86
k — nominal	25	26	28	30	33	35	38	40
k — max	25.42	26.42	28.42	30.42	33.5	35.5	38.5	40.5
k — min	24.58	25.58	27.58	29.58	32.5	34.5	37.5	39.5
kw — min	17.21	17.91	19.31	20.71	22.75	24.15	26.25	27.65
r — min	1	1.2	1.2	1.6	1.6	2	2	2
s (across flats) — nom. = max	60	65	70	75	80	85	90	95
s — min	58.8	63.1	68.1	73.1	78.1	82.8	87.8	92.8

Source: ISO 4017:2022(E), Table 4. Dimensions in millimetres. Bracketed sizes are non-preferred. “—” = not specified for that product grade.

6. Property classes and mechanical properties

Property class	Material group	Tensile strength (min.)	Yield strength (min.)
5.6	Carbon steel	500.0 MPa	300.0 MPa
5.8	Carbon steel	500.0 MPa	400.0 MPa
8.8	Carbon steel	800.0 MPa	640.0 MPa
10.9	Carbon steel	1040.0 MPa	900.0 MPa
12.9	Carbon steel	1220.0 MPa	1100.0 MPa
A2-70	Stainless steel	700.0 MPa	450.0 MPa
A4-70	Stainless steel	700.0 MPa	450.0 MPa

Class selection refers to ISO 898-1 for steel and ISO 3506-1 for stainless steel. Values shown are the minimum values in our open data set for this standard. Per-size pages: ISO 4017 size chart.

7. Weight per 1,000 pieces (theoretical)

Size × length	Weight per 1,000 pcs
M8 × 30	15.8 kg
M10 × 40	31.9 kg
M12 × 50	54.3 kg
M16 × 60	118.1 kg
M20 × 70	218.3 kg
M24 × 80	363.0 kg

Geometric estimate at 7.85 g/cm³ from the standard head dimensions, ±5%, excluding coating and chamfers — not a weighing certificate. Use the bolt weight calculator for any size and length.

8. Equivalent standards

Standard	Relationship	Note
DIN 933	Dimensionally equivalent, fully threaded	Superseded by DIN EN ISO 4017
ISO 4014	Same head, partially threaded	Use when thread length b applies
GB/T 5783-2025	Chinese adoption of ISO 4017:2022 (MOD)	Implemented 2026-02-01
ASME B18.2.1	Inch series — not interchangeable	Different thread and head geometry

9. Materials and finishes

ISO 4017 covers steel and stainless steel screws; property class selection is made from ISO 898-1 (steel) or ISO 3506-1 (stainless). We quote carbon steel and alloy steel in the classes listed above, stainless steel in A2 (304) and A4 (316), and the standard fastener coatings: zinc plated, hot-dip galvanized, dacromet and zinc-nickel (FLZNL). See surface treatment for coating comparisons.

10. How to order

To quote an ISO 4017 screw, state: standard and edition (ISO 4017:2022), size × length (e.g., M10 × 40), property class (8.8, 10.9, A2-70 …), finish or coating, and quantity. Tolerances and length range follow the standard’s tables; deviations must be stated on the drawing.

ISO 4017 hex bolt — product page Request a quotation

11. FAQ

Is ISO 4017 the same as DIN 933?

Dimensionally they are equivalent for the fully threaded hexagon head screw, and the dimension tables match. DIN 933 has been superseded by DIN EN ISO 4017; for new drawings use ISO 4017:2022.

What is the difference between ISO 4017 and ISO 4014?

ISO 4017 is the fully threaded version; ISO 4014 is the partially threaded version. Head dimensions (s, k, e) are the same — the difference is thread length b.

Which property classes does ISO 4017 allow?

Property class selection refers to ISO 898-1 for steel and ISO 3506-1 for stainless steel. Our data set lists 5.6, 5.8, 8.8, 10.9 and 12.9 for steel, and A2-70 / A4-70 for stainless steel.

What do product grade A and product grade B mean?

Product grade is a tolerance class, not a strength class. Grade A (tighter) covers the smaller sizes up to M24; grade B covers M16 to M64. The tables on this page follow the standard’s own split.

What is the thread pitch for M10 and M12?

M10 coarse pitch is 1.5 mm and M12 is 1.75 mm. The pitch for every size is the first row of the dimension tables.

What do s, k, dw and e mean?

s = width across flats, k = head height, dw = bearing face diameter (minimum), e = width across corners (minimum). All four are in the dimension tables.

Can ISO 4017 screws be supplied in stainless steel or with a coating?

Yes. Our data set includes A2 / A4 stainless steel, and we quote zinc plated, hot-dip galvanized, dacromet and zinc-nickel (FLZNL) finishes. Confirm the coating class on the order.

How much does an ISO 4017 bolt weigh?

See the theoretical weight table below: for example M10 × 40 is about 31.9 kg per 1,000 pieces. Values are geometric estimates at 7.85 g/cm³, ±5%, excluding coating and chamfers.

12. Sources and version

Dimensions: ISO 4017:2022(E), Tables 1–4 (retrieved 2026-10-28). Property classes: minimum values in our open data set for ISO 4017 (source: fasteners.eu). Weight: theoretical geometric estimate at 7.85 g/cm³ (±5%, excluding coating and chamfers). Page last reviewed: 2026-10-28.