DIN 571 (DIN) and UNI 704 (UNI) are equivalent fastener standards that specify the same or very similar products. Both standards cover 2 fastener types in our database.
DIN 571 (DIN standard) and UNI 704 (UNI standard) are equivalent standards that define the same fastener geometry and mechanical requirements. Minor differences may exist in tolerances, marking requirements, or referenced test methods, but the products are interchangeable in most applications. Always verify specific project requirements with your engineer.
| Property | DIN 571 | UNI 704 |
|---|---|---|
| Standard Body | DIN | UNI |
| Product Types | 2 fastener types | |
| Interchangeable? | Yes — equivalent standard | |
| Product | Has Specs |
|---|---|
| Woodscrews-Hexagon Lag Screws - Symbol H | ✓ |
| Hexagon Head Wood Screws | ✓ |
From: Woodscrews-Hexagon Lag Screws - Symbol H — applies to both DIN 571 and UNI 704
| Size | P | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 7 | 2 | 13.4 | 11.6 | 20 | 19.16 | 29.16 | 32.9 | 12.5 | 30 |
| 5 | 2.5 | 0.5 | 4.38 | 3.62 | 6 | 5.52 | 9.64 |
Both DIN 571 and UNI 704 fasteners are available with various surface treatments. Common options for these standards include:
Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.
| 10.8 |
| 4 |
| 10 |
| 6 | 3.5 | 1 | 5.68 | 4.92 | 8 | 7.42 | 12.57 | 14.2 | 5.3 | 13 |
| 7 | 4.5 | 1.2 | 7.95 | 7.05 | 12 | 11.3 | 18.16 | 20.5 | 7.5 | 19 |
| 8 | 6 | 1.6 | 10.75 | 9.25 | 16 | 15.3 | 23.16 | 26.1 | 10 | 24 |
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.