A1: DIN 557 specifies the dimensions and technical requirements for Chamfered Square Nuts. This type of nut is characterized by its square shape with a beveled (chamfered) top edge. The square profile provides a significantly larger surface contact area compared to hex nuts, offering greater resistance to rotation and loosening when seated against a flat surface or within a square channel. The chamfer removes sharp edges for improved safety and a more finished appearance.
Anti-Rotation Design: The square shape is ideal for use in corresponding square holes, slots, or channels (e.g., in t-slot aluminum profiles), where it mechanically prevents the nut from turning during bolt tightening. This eliminates the need for a second wrench to hold the nut in place.
Enhanced Bearing Surface: The larger contact area distributes clamping force over a wider region, reducing stress on the mounting material. This makes them suitable for use with softer materials or in applications requiring stable, secure fastening.
Common Uses: Frequently employed in framing systems, machinery, furniture assembly, and any application where a nut must be securely captive within a structural channel or recess.
Material / Grade |
Key Characteristics |
Ideal Application |
Notes |
|
Carbon Steel (General Grade) |
Good strength for general purpose use. Requires plating or coating for corrosion resistance. |
General industrial and construction applications where the nut is protected from weather. |
Often available with zinc or other platings. The standard choice for most non-corrosive environments. |
|
Stainless Steel A2 (18-8) |
Good corrosion resistance, withstands dampness and mild chemicals. May be mildly magnetic. |
Outdoor fixtures, food processing equipment, marine interiors, chemical plants (mild exposure), and humid environments. |
Provides the best balance of corrosion resistance, strength, and cost for most demanding applications. The chamfered edge is beneficial in hygienic or safety-conscious settings. |
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PIC |
PRODUCT |
SIZE |
GRADE |
FINISH |
THREAD |
 |
Chamfered Square Nuts (DIN 557) - Stainless Steel (A2) | M2-M10 | A2 Grade | Natural | Coarse |
|
Chamfered Square Nuts (DIN 557) - Marine Stainless Steel (A4) | M2-M10 | A4 Grade | Natural | Coarse |
|
Zinc Plated Medium-Strength Square Nut(DIN 557)- Class 5 | M2-M10 | 4 Grade | Zinc Plated | Coarse |