Guide 04 · Fastener Reference Guide
Head Markings
Identifying a fastener's grade from the markings stamped on its head.
Text version — searchable and screen-reader friendly
Common Nuts — Proof Load
| Product Specifciations | Class 5 | Class 8 | Class 10 | Grade 2 | Grade 5 | Grade 8 |
|---|---|---|---|---|---|---|
| Proof Load | > M10 610 MPa > M16 630 MPa | ≤ M16 880 MPa > M16 920 MPa | ≤ M16 1040 MPa > M16 1050 MPa | 90000 psi | 120000 psi | 150000 psi |
| METRIC | INCH |