螺帽：方形
DIN 557
DIN 557 - Fasteners - Square nuts - Product grade C
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高度大於DIN 562薄型方螺帽、且一端面帶倒角的方螺帽。DIN 557:2026-02規定產品等級C、M5–M16公制粗牙螺紋，材料為鋼或不鏽鋼。M10的對邊寬度為17 mm，M12為19 mm。
| 產品 | 螺紋直徑, mm | 螺距, mm | 對邊寬度, mm | 高度, mm | 倒角 1 | 倒角配置 | 最小倒角角度, ° | 最大倒角角度, ° | 最小倒角圓直徑, mm | 最小扳擰高度, mm |
|---|---|---|---|---|---|---|---|---|---|---|
| DIN 557 square nut M5 | 5 | 0.8 | 8 | 4 | 0 | single | 15 | 30 | 6.7 | 2.5 |
| DIN 557 square nut M6 | 6 | 1 | 10 | 5 | 0 | single | 15 | 30 | 8.7 | 3.2 |
| DIN 557 square nut M8 | 8 | 1.25 | 13 | 6.5 | 0 | single | 15 | 30 | 11.5 | 4.1 |
| DIN 557 square nut M10 | 10 | 1.5 | 17 | 8 | 0 | single | 15 | 30 | 15.5 | 5.2 |
| DIN 557 square nut M12 | 12 | 1.75 | 19 | 10 | 0 | single | 15 | 30 | 17.2 | 6.6 |
| DIN 557 square nut M16 | 16 | 2 | 24 | 13 | 0 | single | 15 | 30 | 22 | 8.6 |