When Hex Keys (Allen Keys) are required in Grade 8.8 Steel, the alternative grades and the trade-offs between them matter as much as the dimensions. This page covers both, plus mechanical and corrosion data.
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.
Comparable Grades
For Hex Keys (Allen Keys), class 10.9 or 12.9 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.
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 |