Engineering Data 2.2 / System C

DIN 933 HEX HEAD BOLT — DIMENSIONS & ISO 4017 EQUIVALENCE

DIN 933 is the legacy German designation for the fully threaded hexagon head bolt. The current standard behind it is DIN EN ISO 4017, i.e. ISO 4017:2022 — and because the dimension tables are identical, the tables below are the ISO 4017:2022 tables. If your drawing says DIN 933, these are the dimensions you need; if you are issuing a new drawing, specify ISO 4017:2022.

1. Standard Identity

Legacy designation

DIN 933

Current standard

ISO 4017:2022 / DIN EN ISO 4017

Product grades

A and B

Thread range

M1.6 – M64, metric coarse

Thread type

Fully threaded

Partially threaded counterpart

DIN 931 (ISO 4014)

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 — DIN 933 is dimensionally identical. 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 — DIN 933 is dimensionally identical. 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 — DIN 933 is dimensionally identical. 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 — DIN 933 is dimensionally identical. 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 are the minimum values in our open data set for DIN 933. Per-size pages: DIN 933 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. Use the bolt weight calculator for any size and length.

8. Equivalent standards

Standard	Relationship	Note
ISO 4017:2022	Current standard; dimensionally identical	Use for new drawings
DIN 931	Partial thread version (ISO 4014)	Same head, different thread length
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

DIN 933 screws are quoted in carbon steel and alloy steel in the property classes 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 a DIN 933 screw, state: standard (DIN 933 or ISO 4017:2022), size × length (e.g., M10 × 40), property class (8.8, 10.9, A2-70 …), finish or coating, and quantity. Where the drawing is silent, state which thread length or tolerance applies.

DIN 933 hex bolt — product page Request a quotation

11. FAQ

Is DIN 933 still a valid standard?

DIN 933 is the legacy German designation for the fully threaded hexagon head bolt. The current standard is DIN EN ISO 4017 (ISO 4017:2022); DIN 933 dimensions match it, which is why the DIN 933 designation is still used by buyers and on drawings.

What is the difference between DIN 933 and DIN 931?

DIN 933 is fully threaded; DIN 931 is the partially threaded version (now ISO 4014). Head dimensions are the same — the difference is the thread length b.

Is DIN 933 the same as ISO 4017?

Dimensionally yes. The tables on this page are the ISO 4017:2022 tables, which DIN 933 follows. Use ISO 4017:2022 for new drawings.

Which property classes are available?

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. Class selection refers to ISO 898-1 and ISO 3506-1.

What is the thread pitch for M10 and M12?

M10 coarse pitch is 1.5 mm, M12 is 1.75 mm. Pitch for every size is the first row of the tables.

What sizes does DIN 933 cover?

The dimension tables run from M1.6 to M64 in the ISO 4017:2022 split: grade A for M1.6–M24 and grade B for M16–M64.

Can you supply DIN 933 in stainless steel or with a coating?

Yes — A2 / A4 stainless steel, and zinc plated, hot-dip galvanized, dacromet or zinc-nickel (FLZNL) finishes. Confirm the coating class on the order.

How much does a DIN 933 bolt weigh?

See the theoretical weight table: M10 × 40 is about 31.9 kg per 1,000 pieces. Values are geometric estimates ±5%, excluding coating and chamfers.

12. Sources and version

Dimension tables: ISO 4017:2022(E), Tables 1–4 (DIN 933 is dimensionally identical; retrieved 2026-10-28). Property classes: minimum values in our open data set for DIN 933 (source: fasteners.eu). Weight: theoretical geometric estimate at 7.85 g/cm³ (±5%, excluding coating and chamfers). Page last reviewed: 2026-10-28.