Tools · ISO 2936

Grade 8.8 Steel Hex Keys (Allen Keys)

Grade 8.8 Steel Hex Keys (Allen Keys) are stocked to ISO 2936. The grade provides requires plating (zinc) for corrosion protection and is magnetic; the practical service range is up to approx. +300 °C. Property data, grade comparison and the full size table follow.

Why Choose Grade 8.8 Steel for Hex Keys (Allen Keys)

The workhorse medium-carbon alloy grade for structural joints. For hex keys (allen keys), this matters when requires plating (zinc) for corrosion protection is the primary requirement.

Mechanical & Physical Properties

Grade designation	class 8.8
Magnetic response	Magnetic
Service temperature	up to approx. +300 °C
Corrosion characteristic	Requires plating (zinc) for corrosion protection

Corrosion Behavior in Service

Carbon and alloy steel hex keys (allen keys) require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.

Galvanic & Galling Considerations

For hex keys (allen keys) in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.

Sizes of Hex Keys (Allen Keys) Available in Grade 8.8 Steel

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

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

Are Grade 8.8 Steel Hex Keys (Allen Keys) magnetic?

Grade 8.8 Steel Hex Keys (Allen Keys) are magnetic.

What corrosion resistance do Grade 8.8 Steel Hex Keys (Allen Keys) offer?

Grade 8.8 Steel Hex Keys (Allen Keys) provide requires plating (zinc) for corrosion protection with a service range of up to approx. +300 °C.

When should I move from class 8.8 to class 10.9 / 12.9 for Hex Keys (Allen Keys)?

Step up to class 10.9 / 12.9 when the joint preload approaches the proof load of the current class. The higher class adds preload at the same diameter, often saving size and weight.

Is Grade 8.8 Steel prone to hydrogen embrittlement?

Class 10.9 and above can be susceptible to hydrogen embrittlement when electroplated. Specify post-plating baking, or use mechanical-zinc / zinc-flake finishes which avoid the cathodic plating step.

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.