Tools · ISO 2936

ISO 2936 Hex Keys (Allen Keys) Dimensions

Specification summary of ISO 2936 as applied to hex keys (allen keys): the dimensions the standard controls, the tolerance and product grades it defines, the full specified size range, and the equivalent DIN/ISO/ASME designations.

ISO 2936 — Scope

ISO 2936 specifies the dimensions and tolerances of hex keys (allen keys). Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).

Tolerance & Product Grades

ISO 2936, alongside the related ISO 2936 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.

Dimensions Specified by ISO 2936

Wrench size s (mm)	Common bolt sizes	Short leg (mm)	Long leg (mm)	Reference standard
0.7	M1	28	51	ISO 2936 / DIN 911
0.9	M1.1	28	56	ISO 2936 / DIN 911
1.0	M1.2	32	56	ISO 2936 / DIN 911
1.3	M1.6	36	63	ISO 2936 / DIN 911
1.5	M2	40	71	ISO 2936 / DIN 911
2.0	M2.5	50	90	ISO 2936 / DIN 911
2.5	M3	56	100	ISO 2936 / DIN 911
3.0	M4	63	112	ISO 2936 / DIN 911
4.0	M5	71	125	ISO 2936 / DIN 911
5.0	M6	80	140	ISO 2936 / DIN 911
6.0	M8	90	160	ISO 2936 / DIN 911
7.0	---	100	180	ISO 2936 / DIN 911
8.0	M10	112	200	ISO 2936 / DIN 911
9.0	---	112	200	ISO 2936 / DIN 911
10.0	M12	125	224	ISO 2936 / DIN 911
12.0	M14	140	250	ISO 2936 / DIN 911
14.0	M16	160	280	ISO 2936 / DIN 911
17.0	M20	180	315	ISO 2936 / DIN 911
19.0	M22	200	355	ISO 2936 / DIN 911
22.0	M24	224	400	ISO 2936 / DIN 911
24.0	M27	250	450	ISO 2936 / DIN 911
27.0	M30	280	500	ISO 2936 / DIN 911
32.0	M36	315	560	ISO 2936 / DIN 911
36.0	M42	355	630	ISO 2936 / DIN 911
41.0	M48	400	710	ISO 2936 / DIN 911
46.0	---	450	800	ISO 2936 / DIN 911
50.0	---	500	900	ISO 2936 / DIN 911
55.0	---	500	900	ISO 2936 / DIN 911
60.0	---	560	1000	ISO 2936 / DIN 911

Companion Standards

ISO 2936 controls only the geometry of hex keys (allen keys). The mechanical strength is set by ISO 898-1 (bolts and screws) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards (e.g. ISO 4042 for electroplating). For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).

When to Specify ISO 2936

Choose ISO 2936 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for hex keys (allen keys).

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

Request a Quote

Adjust the parameters in the drawing above and click "Request this configuration" to send the exact specification straight to this form.

Category Type Standard Thread size Material Finish

Dimensions & Specifications (ISO 2936)

Wrench size s (mm)	Common bolt sizes	Short leg (mm)	Long leg (mm)	Reference standard
0.7	M1	28	51	ISO 2936 / DIN 911
0.9	M1.1	28	56	ISO 2936 / DIN 911
1.0	M1.2	32	56	ISO 2936 / DIN 911
1.3	M1.6	36	63	ISO 2936 / DIN 911
1.5	M2	40	71	ISO 2936 / DIN 911
2.0	M2.5	50	90	ISO 2936 / DIN 911
2.5	M3	56	100	ISO 2936 / DIN 911
3.0	M4	63	112	ISO 2936 / DIN 911
4.0	M5	71	125	ISO 2936 / DIN 911
5.0	M6	80	140	ISO 2936 / DIN 911
6.0	M8	90	160	ISO 2936 / DIN 911
7.0	---	100	180	ISO 2936 / DIN 911
8.0	M10	112	200	ISO 2936 / DIN 911
9.0	---	112	200	ISO 2936 / DIN 911
10.0	M12	125	224	ISO 2936 / DIN 911
12.0	M14	140	250	ISO 2936 / DIN 911
14.0	M16	160	280	ISO 2936 / DIN 911
17.0	M20	180	315	ISO 2936 / DIN 911
19.0	M22	200	355	ISO 2936 / DIN 911
22.0	M24	224	400	ISO 2936 / DIN 911
24.0	M27	250	450	ISO 2936 / DIN 911
27.0	M30	280	500	ISO 2936 / DIN 911
32.0	M36	315	560	ISO 2936 / DIN 911
36.0	M42	355	630	ISO 2936 / DIN 911
41.0	M48	400	710	ISO 2936 / DIN 911
46.0	---	450	800	ISO 2936 / DIN 911
50.0	---	500	900	ISO 2936 / DIN 911
55.0	---	500	900	ISO 2936 / DIN 911
60.0	---	560	1000	ISO 2936 / DIN 911

Frequently Asked Questions

Can I substitute ISO 2936 for the corresponding DIN standard on a drawing?

On modern drawings the ISO standard is the master reference; the older DIN equivalent is a cross-reference. For most dimensional purposes the parts are interchangeable, but check tolerance grades and the head height — these are the most common points of divergence.

When did ISO 2936 last revise its dimensional table?

ISO standards for hex keys (allen keys) are reviewed on roughly a five-year cycle. Always reference the latest published edition (or the edition cited contractually); the dimensional table on this page reflects the current commercially-supplied form.

What does ISO 2936 specify for Hex Keys (Allen Keys)?

ISO 2936 specifies the dimensions and tolerances of hex keys (allen keys). Material and property class are governed by separate standards in the same family.

What product grades does ISO 2936 define?

ISO 2936 typically distinguishes product grades for precision (A/B) and general engineering (C). The selection for Hex Keys (Allen Keys) depends on the precision your application requires.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.