Left-Hand Thread Hex Nuts manufactured in Property Class 8.8 Steel (ISO 898-1 property class 8.8) are dimensioned to DIN 934. 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 8.8 Steel for Left-Hand Thread Hex Nuts
The workhorse medium-carbon alloy class for structural joints. For left-hand thread hex nuts, this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 8.8 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
Corrosion Behavior in Service
Carbon and alloy steel left-hand thread hex nuts 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 Left-Hand Thread Hex Nuts, 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 Left-Hand Thread Hex Nuts Available in Property Class 8.8 Steel
| Thread size | Pitch (mm) | Across flats s (mm) | Across corners e (mm) | Nut height m (mm) | Thread direction | Reference standard |
|---|---|---|---|---|---|---|
| M6 | 1.0 | 10 | 11.05 | 5.0 | Left-hand | DIN 934 LH |
| M8 | 1.25 | 13 | 14.38 | 6.5 | Left-hand | DIN 934 LH |
| M10 | 1.5 | 17 | 18.90 | 8.0 | Left-hand | DIN 934 LH |
| M12 | 1.75 | 19 | 21.10 | 10.0 | Left-hand | DIN 934 LH |
| M16 | 2.0 | 24 | 26.75 | 13.0 | Left-hand | DIN 934 LH |
| M20 | 2.5 | 30 | 33.53 | 16.0 | Left-hand | DIN 934 LH |
| M24 | 3.0 | 36 | 39.98 | 19.0 | Left-hand | DIN 934 LH |
Dimensions are independent of the material: every size above is available in Property Class 8.8 Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
Grade 8 8 Steel is one of the grades the catalog describes. Thread size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
