Slotted Headless Screws with Shank manufactured in Property Class 12.9 Steel (ISO 898-1 property class 12.9) are dimensioned to ISO 2342. 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 Property Class 12.9 Steel for Slotted Headless Screws with Shank
The highest common strength class, for high-load machine assembly. For slotted headless screws with shank, this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
| Corrosion characteristic | Requires plating or black-oxide protection |
Corrosion Behavior in Service
Carbon and alloy steel slotted headless screws with shank 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 Slotted Headless Screws with Shank, 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 Slotted Headless Screws with Shank Available in Property Class 12.9 Steel
| Size | Pitch P (mm) | b (mm) | d_s_min (mm) | d_s_max (mm) | n_nom (mm) | n_min (mm) | n_max (mm) | t_min (mm) | t_max (mm) | x_max (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M1 | 0.25 | 1.2 | 0.86 | 1 | 0.2 | 0.26 | 0.4 | 0.63 | 0.78 | 0.6 | 2.5~4 | ISO 2342 |
| M1.2 | 0.25 | 1.4 | 1.06 | 1.2 | 0.25 | 0.31 | 0.45 | 0.63 | 0.79 | 0.6 | 3~5 | ISO 2342 |
| M1.6 | 0.35 | 1.9 | 1.46 | 1.6 | 0.3 | 0.36 | 0.5 | 0.88 | 1.06 | 0.9 | 4~6 | ISO 2342 |
| M2 | 0.4 | 2.4 | 1.86 | 2 | 0.3 | 0.36 | 0.5 | 1 | 1.2 | 1 | 5~8 | ISO 2342 |
| M2.5 | 0.45 | 3 | 2.36 | 2.5 | 0.4 | 0.46 | 0.6 | 1.1 | 1.33 | 1.1 | 5~10 | ISO 2342 |
| M3 | 0.5 | 3.6 | 2.86 | 3 | 0.5 | 0.56 | 0.7 | 1.25 | 1.5 | 1.25 | 6~12 | ISO 2342 |
| (M3.5) | 0.6 | 4.2 | 3.32 | 3.5 | 0.5 | 0.56 | 0.7 | 1.5 | 1.78 | 1.5 | ISO 2342 | |
| M4 | 0.7 | 4.8 | 3.82 | 4 | 0.6 | 0.66 | 0.8 | 1.75 | 2.05 | 1.75 | 8~14 | ISO 2342 |
| M5 | 0.8 | 6 | 4.82 | 5 | 0.8 | 0.86 | 1 | 2 | 2.35 | 2 | 10~20 | ISO 2342 |
| M6 | 1 | 7.2 | 5.82 | 6 | 1 | 1.06 | 1.2 | 2.5 | 2.9 | 2.5 | 12~25 | ISO 2342 |
| M8 | 1.25 | 9.6 | 7.78 | 8 | 1.2 | 1.26 | 1.51 | 3.1 | 3.6 | 3.2 | 14~30 | ISO 2342 |
| M10 | 1.5 | 12 | 9.78 | 10 | 1.6 | 1.66 | 1.91 | 3.75 | 4.25 | 3.8 | 16~35 | ISO 2342 |
Dimensions are independent of the material: every size above is available in Property Class 12.9 Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
Grade 12 9 Steel is one of the grades the catalog describes. Head form and drive can be specified to the assembly rather than to a standard: a larger bearing face, a security drive, or a socket sized for the tool already on the bench. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
