Brass grub screw
Grub screws — also called set screws — are headless threaded fasteners driven fully into a tapped hole to locate or lock one part against another, most often a hub, collar, gear or pulley onto a shaft. Because they have no head, the whole fastener sits flush or below the surface. Definite Metal manufactures brass set screws across the common DIN and ISO standards, in slotted and hexagon-socket drives, with the four working points engineers choose between: flat, cone, cup and dog. Our standard material is CW614N free-machining brass; other grades and stainless are available on request.
Choosing the Point
The point does the work, so it decides the standard you order.
A flat point (DIN 551, DIN 913, DIN 427) presses squarely against the mating surface without digging in. It suits frequent adjustment and bears against pre-hardened shafts or soft inserts where you do not want to mar the surface.
A cone point (DIN 553) has a sharp included angle that seats into a matching drilled dimple or bites into a softer shaft, giving strong resistance to rotation for near-permanent settings.
A cup point (DIN 438 / ISO 7436) presents a circular rim that bites a small annular ring into the shaft. It is the general-purpose locking point for holding torque against solid round bar.
A dog point (DIN 417 / ISO 7435, long dog) has an unthreaded cylindrical nose that enters a hole or slot in the shaft, locating the two parts positively and resisting axial movement — useful as a stop or a keyless drive.
Choosing the Drive
Slotted set screws (DIN 417, 427, 438, 551, 553) are tightened with a flat-blade screwdriver and are economical and low-profile. Hexagon-socket set screws (DIN 913 and its cone/dog/cup siblings DIN 914/915/916) accept an Allen key, allow more torque and sit fully inside the hole, which is why they dominate machine-tool and drive-line assemblies. Browse the full brass fasteners range for related products.
DIN → ISO Cross-Reference
| DIN | Equivalent ISO | Drive | Point | Typical size range |
|---|---|---|---|---|
| DIN 551 | ISO 4766 | Slotted | Flat point | M1.6–M12 |
| DIN 553 | ISO 7434 | Slotted | Cone point | M1.6–M12 |
| DIN 438 | ISO 7436 | Slotted | Cup point | M3–M10 (ISO from M1.6) |
| DIN 417 | ISO 7435 | Slotted | Long dog point | M1.6–M12 |
| DIN 427 | ISO 2342 | Slotted, part thread | Flat point | M3–M10 |
| DIN 913 | ISO 4026 | Hex socket | Flat point | M1.6–M24 |
| DIN 914 | ISO 4027 | Hex socket | Cone point | M1.6–M24 |
| DIN 915 | ISO 4028 | Hex socket | Dog point | M1.6–M24 |
| DIN 916 | ISO 4029 | Hex socket | Cup point | M1.6–M24 |
DIN 914/915/916 rows shown for cross-reference; enquire for these types — same family, hex-socket drive.
Why Brass for Set Screws
Brass grub screws are specified where corrosion resistance, electrical conductivity or non-magnetic behaviour matter more than maximum clamp load: terminal blocks and busbars, instrument and meter assemblies, marine and decorative fittings, and light shaft collars. CW614N machines cleanly to a sharp point or crisp slot and holds thread accuracy in high-volume turning. Where a hardened steel bite is required instead, we can quote the same geometries in steel or stainless.
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.
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
Frequently Asked Questions
They are two names for the same fastener — a headless screw threaded along its length and driven fully into a tapped hole. Grub screw is common in the UK and India; set screw is common in the US.
Flat for frequent adjustment or against hardened/soft surfaces, cone for a drilled dimple or permanent set, cup for general locking against round bar, and dog point to locate positively in a hole or slot.
Slotted is economical and low-profile for light duty. Hexagon socket allows higher tightening torque and sits fully recessed, which is why it is standard on machine and drive components.
Yes — all of these geometries are produced in CW614N brass. Steel and stainless 303/304/316 are available on request when a harder bite or higher torque is needed.
Common range M1.6 to M12, larger for hex-socket types, with custom lengths. Typical MOQ is 500 pcs and lead time is 1 to 2 weeks.