Socket Set Screws manufactured in Grade 12.9 Steel (class 12.9) are dimensioned to ISO 4026 / ISO 4029 / DIN 913-916. The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.
Why Choose Grade 12.9 Steel for Socket Set Screws
The highest common strength class, for high-load machine assembly. For socket set screws, this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating or black-oxide protection |
Corrosion Behavior in Service
Carbon and alloy steel socket set screws 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 Socket Set Screws, class 8.8 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 Socket Set Screws Available in Grade 12.9 Steel
| Size | Pitch (mm) | Hex socket s (mm) | Engagement depth t min (mm) | Point diameter dp (mm) | End type | Reference standard |
|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Flat point | ISO 4026 / DIN 913-916 |
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Cone point | ISO 4027 / DIN 913-916 |
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Dog point | ISO 4028 / DIN 913-916 |
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Cup point | ISO 4029 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Flat point | ISO 4026 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Cone point | ISO 4027 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Dog point | ISO 4028 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Cup point | ISO 4029 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Flat point | ISO 4026 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Cone point | ISO 4027 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Dog point | ISO 4028 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Cup point | ISO 4029 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Flat point | ISO 4026 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Cone point | ISO 4027 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Dog point | ISO 4028 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Cup point | ISO 4029 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Flat point | ISO 4026 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Cone point | ISO 4027 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Dog point | ISO 4028 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Cup point | ISO 4029 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Flat point | ISO 4026 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Cone point | ISO 4027 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Dog point | ISO 4028 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Cup point | ISO 4029 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Flat point | ISO 4026 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Cone point | ISO 4027 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Dog point | ISO 4028 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Cup point | ISO 4029 / DIN 913-916 |
| M8 | 1.25 | 4.0 | 4.0 | 5.5 | Flat point | ISO 4026 / DIN 913-916 |
| M8 | 1.25 | 4.0 | 4.0 | 5.5 | Cone point | ISO 4027 / DIN 913-916 |