Clamping Handle Screw (Long) manufactured in Grade 12.9 Steel (class 12.9) are dimensioned to DIN 6336 / GN 313. 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 Clamping Handle Screw (Long) — DIN 6336 / GN 313 (Series 044)
The highest common strength class, for high-load machine assembly. For clamping handle screw (long) — din 6336 / gn 313 (series 044), 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 clamping handle screw (long) — din 6336 / gn 313 (series 044) 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 Clamping Handle Screw (Long) — DIN 6336 / GN 313 (Series 044), 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 Clamping Handle Screw (Long) — DIN 6336 / GN 313 (Series 044) Available in Grade 12.9 Steel
| Thread size | Pitch (mm) | Length L (mm) | Handle length (mm) | Knob diameter (mm) | Reference standard |
|---|---|---|---|---|---|
| M5 | 0.8 | 20 | 45 | 28 | DIN 6336 / GN 313 |
| M6 | 1.0 | 25 | 50 | 32 | DIN 6336 / GN 313 |
| M8 | 1.25 | 30 | 60 | 40 | DIN 6336 / GN 313 |
| M10 | 1.5 | 40 | 70 | 45 | DIN 6336 / GN 313 |
| M12 | 1.75 | 50 | 80 | 50 | DIN 6336 / GN 313 |