STAINLESS STEEL SQUARE NUTS DIN 562

Square Nuts DIN 562 — A square nut trades the hexagon's six flats for four larger, flatter faces, and that shape matters most where the nut needs to be captured against rotation by something other than a spanner: seated in a slotted channel, T-track, or matching square recess, the flat sides bear against the slot walls and resist turning far more effectively than a hexagon's point contact would in the same recess. DIN 562 specifically defines a thin, low-height square nut with sharp, unchamfered edges, distinct from the fuller-body chamfered square nut covered separately — the thin profile trades thread engagement for a lower stack height, similar in principle to the hexagon thin nut range, so it's better suited to lighter-duty fixing and channel systems than to primary structural load-bearing joints. Typical applications include slotted channel and strut systems, older or agricultural machinery designs that specify a square format historically, and sheet metal work where a square recess is punched to lock the nut against rotation during single-handed tightening of the bolt from the opposite side. On its own, away from a matching recess, a DIN 562 nut behaves like any plain nut, relying on standard friction and torque with no inherent locking feature; the anti-rotation benefit only applies when it's actually seated in a matching square slot or channel. A2 stainless suits most general channel-system and light engineering use; A4 is worth the extra cost for outdoor strut systems, agricultural equipment exposed to weather, or washdown environments, since these applications often leave the nut exposed and hard to inspect regularly. Sizing is driven by the mating bolt's diameter and pitch, but for channel or slot applications the across-flats dimension of the square body must also be checked against the specific slot width it needs to seat into, since this isn't interchangeable with the hexagon nut range.

FAQs
Does the square nut need to match the slot width exactly?
Yes, the across-flats dimension of the square body must fit the channel or recess closely enough to resist rotation without excessive play, so this should be checked against the specific slot or channel profile rather than assumed from thread size alone.

Is DIN 562 suitable for a primary structural joint?
Its thin profile gives reduced thread engagement compared with a full-height square nut, so for genuinely load-bearing structural connections a fuller-body option, or a standard hexagon full nut where a square format isn't specifically required, is usually the better choice.

What are DIN 562 square nuts used for?
They are commonly used in slotted channel systems, sheet metal work, and older or agricultural machinery, where the flat sides can seat against a matching square recess to prevent the nut spinning during tightening.

How does DIN 562 differ from a standard chamfered square nut?
DIN 562 is a thin, low-height square nut, whereas a chamfered square nut typically has full body height with eased or rounded edges for easier handling and assembly. The choice depends on the required thread engagement and edge profile.