ISO 7436 - Slotted set screws with cup point
ISO 7436 is the international standard for slotted set screws with a cup point — the standard exporters and international OEMs quote when their drawings are written to ISO rather than DIN. The screw is headless and screwdriver-driven, and its end is recessed to form a sharp circular rim that bites a small ring into the shaft to lock it. ISO 7436 spans a broader size range than the German DIN 438, running from M1.6 up to M12, covering the very small sizes used in electronics as well as mid sizes for general assembly. Definite Metal manufactures ISO 7436 in CW614N brass across that full range. Part of our brass grub screws range.
Size Coverage and Interchangeability
Where DIN 438 is commonly listed from M3 to M10, ISO 7436 formally includes the smaller M1.6, M2 and M2.5 sizes and the larger M12 — useful when a single ISO callout has to cover a wide screw family. Within their common sizes an ISO 7436 screw and a DIN 438 screw are the same physical part; the standard number is what changes on the drawing and certificate. We can mark and certify to either. The rim concentrates the tightening force into a narrow circle, locking strongly on a plain round shaft with no need to drill a seat; where a positive peg-in-hole location is wanted, use the ISO 7435 long dog point instead.
Why Brass
Brass ISO 7436 is used where a dependable lock has to combine with corrosion resistance, non-magnetic behaviour or electrical contact — small instrument and electronics collars, meter and terminal assemblies, and marine or decorative hardware. CW614N forms a clean, concentric cup rim even in the smallest sizes. For a deeper bite on hardened steel shafts under heavy vibration, the same ISO 7436 geometry is available in steel or stainless.
ISO 7436 Dimensions (mm)
| Thread d | Pitch P | Cup rim dia. dz (max) | Slot width n | Slot depth t (min) | Length l range |
|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.8 | 0.25 | 0.56 | 2–8 |
| M2 | 0.4 | 1.0 | 0.25 | 0.64 | 2–10 |
| M2.5 | 0.45 | 1.2 | 0.4 | 0.72 | 2.5–12 |
| M3 | 0.5 | 1.4 | 0.4 | 0.8 | 3–25 |
| M4 | 0.7 | 2.0 | 0.6 | 1.12 | 4–25 |
| M5 | 0.8 | 2.5 | 0.8 | 1.28 | 5–30 |
| M6 | 1.0 | 3.0 | 1.0 | 1.6 | 5–35 |
| M8 | 1.25 | 5.0 | 1.2 | 2.0 | 8–40 |
| M10 | 1.5 | 6.0 | 1.6 | 2.4 | 10–40 |
| M12 | 1.75 | 8.0 | 2.0 | 2.8 | 12–50 |
Standard nominal values; other sizes to order.
ISO 7436 is equivalent to DIN 438. Related national designations include CSN 021182 and PN 82274.
Materials — Brass Grades
| Grade | Standard | Character | Typical composition |
|---|---|---|---|
| CW614N | EN 12164 | Free-machining brass (standard) | ~58% Cu, ~3% Pb, bal. Zn |
| CW617N | EN 12165 | Hot-forging brass | ~58% Cu, ~2% Pb, bal. Zn |
| IS 319 | IS 319 | Free-cutting brass (Indian) | ~57–59% Cu, Pb, bal. Zn |
| MS / SS 303/304/316 | — | On request | Mild steel or stainless |
Also available in MS and SS 303/304/316 on request.
Finish Options
Natural brass as standard; on request nickel plating, tin plating, or bright dip / passivation. Steel and stainless variants can be supplied plain, zinc plated, or black oxide.
Manufacturing & Export Capability
Custom manufacturing from drawing/sample · MOQ: 500 pcs (typical) · Lead time 1–2 weeks · ISO 9001:2015 · Export packing · FOB Mundra / CIF worldwide · Brass specialist in Jamnagar, India’s brass city
18+ years of manufacturing experience · 19 skilled workers · Sales@definitemetal.com
Applications & Industries
ISO 7436 brass cup-point set screws lock collars, knobs and gears on plain shafts across electronics, instruments, meters and terminals, and marine and decorative hardware, wherever an international ISO callout and corrosion-resistant, non-magnetic material are both required.
Frequently Asked Questions
Within their shared sizes, yes — the parts are identical. ISO 7436 additionally defines the small M1.6 to M2.5 sizes and M12, so it is the broader callout. We mark to whichever standard your order needs.
No. The rim bites directly onto a plain round shaft, which is why cup point is the easy, general-purpose locking choice.
Yes — ISO 7436 covers these and we turn them cleanly in CW614N; typical MOQ 500 pcs per size.
It holds well for light and medium duty. For a deep bite on a hardened steel shaft under heavy vibration, choose steel or stainless to the same ISO 7436 dimensions.
From the short lengths in the table up to 50 mm at M12, plus custom lengths to drawing.