Material specification page for fine-thread all-metal hex lock nuts in Property Class 8.8 Steel. Covers the grade designation (ISO 898-1 property class 8.8), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO 10513.
Why Choose Property Class 8.8 Steel for Fine-Thread All-Metal Hex Lock Nuts
The workhorse medium-carbon alloy class for structural joints. For fine-thread all-metal hex lock 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 fine-thread all-metal hex lock 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 Fine-Thread All-Metal Hex Lock 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 Fine-Thread All-Metal Hex Lock Nuts Available in Property Class 8.8 Steel
| Size | Pitch P (mm) | d_a_max (mm) | d_a_min (mm) | d_w_min (mm) | Width across corners e (mm) | h_max (mm) | h_min (mm) | m_w_min (mm) | Width across flats s (mm) | s_min (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1 | 8.75 | 8 | 11.63 | 14.38 | 8 | 7.14 | 5.15 | 13 | 12.73 | ISO 10513 |
| M10x1 | 1 | 10.8 | 10 | 14.63 | 17.77 | 10 | 8.94 | 6.43 | 16 | 15.73 | ISO 10513 |
| M10x1.25 | 1.25 | 10.8 | 10 | 14.63 | 17.77 | 10 | 8.94 | 6.43 | 16 | 15.73 | ISO 10513 |
| M12x1.25 | 1.25 | 13 | 12 | 16.63 | 20.03 | 13.3 | 11.57 | 8.3 | 18 | 17.73 | ISO 10513 |
| M12x1.5 | 1.5 | 13 | 12 | 16.63 | 20.03 | 13.3 | 11.57 | 8.3 | 18 | 17.73 | ISO 10513 |
| (M14x1.5) | 1.5 | 15.1 | 14 | 19.64 | 23.36 | 14.1 | 13.4 | 9.68 | 21 | 20.67 | ISO 10513 |
| M16x1.5 | 1.5 | 17.3 | 16 | 22.49 | 26.75 | 16.4 | 15.7 | 11.28 | 24 | 23.67 | ISO 10513 |
| M20x1.5 | 1.5 | 21.6 | 20 | 27.7 | 32.95 | 20.3 | 19 | 13.52 | 30 | 29.16 | ISO 10513 |
| M24x2 | 2 | 25.9 | 24 | 33.25 | 39.55 | 23.9 | 22.6 | 16.16 | 36 | 35 | ISO 10513 |
| M30x2 | 2 | 32.4 | 30 | 42.75 | 50.85 | 30 | 27.3 | 19.44 | 46 | 45 | ISO 10513 |
| M36x2 | 2 | 38.9 | 36 | 51.11 | 60.79 | 36 | 33.1 | 23.52 | 55 | 53.8 | ISO 10513 |
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. Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
