STAINLESS STEEL SLOT SHOULDER SCREWS DIN 927

Slot Shoulder Screws DIN 927 — DIN 927 is the second slotted shoulder screw standard PTS stocks alongside DIN 923, and like its counterpart it's built around a precision-ground plain shank, sized apart from the screw thread, that's designed to locate or pivot a component rather than simply clamp it. Where the two standards differ is in head profile and shoulder-to-thread proportions — DIN 923 specifically defines a pan head shoulder screw, while DIN 927 covers the slotted shoulder screw without necessarily fixing the same head form — so drawings should always specify DIN 923 or DIN 927 explicitly rather than treating the two as interchangeable on a like-for-like basis.

Typical applications sit firmly in the realm of motion and location rather than static clamping: pivot points for levers, cams and linkages; precision spacers holding two components a fixed distance apart; and locating features in jigs, fixtures and machine guides where a controlled running or sliding fit is the whole point of the part. In each case, it's the shoulder diameter — not the thread — that does the functional work, so the shoulder is held to a tighter tolerance than a standard clearance-hole screw, sized for a running or location fit against a bushing or bore.

Grade selection mirrors general machine screw practice: A2 stainless suits the majority of indoor jigs, fixtures and machine guides, while A4 is worth the extra cost where the pivot or spacer operates in a washdown, marine, or otherwise corrosive setting, since pitting on a precision shoulder degrades the running fit far more noticeably than surface corrosion on a plain clamping screw would.

If a shoulder screw is also expected to carry meaningful axial clamp load in addition to its pivot or location role, that dual function should be confirmed against the design intent, since carrying structural load is a secondary capability of the shoulder form, not its primary purpose. Specify both the shoulder diameter, matched to the bore it runs in, and the thread size, matched to the tapped hole securing it.

FAQs
How does the head form of DIN 927 differ from DIN 923?
DIN 923 specifically defines a pan head shoulder screw. DIN 927 covers a slotted shoulder screw without necessarily specifying the same head form. Always check the head geometry called out on the drawing when specifying either standard, rather than assuming the two are dimensionally identical.

Can DIN 927 shoulder screws be used as structural fasteners?
They're intended primarily as pivots, spacers, or locating features. If a shoulder screw is also expected to carry significant axial clamp load, confirm the design intent, as this is a secondary function of the shoulder form.

Is the shoulder diameter the same as the thread diameter?
No. The shoulder diameter is a separate, closely toleranced dimension distinct from the screw thread, sized for a running or location fit rather than for clamping.