Key specifications
| Standards | DIN 913, 914, 915, 916; ISO 4026, 4027, 4028, 4029 |
|---|---|
| Sizes | Common metric sizes M3 to M20 |
| Drive | Internal hexagon socket |
| Materials | Alloy steel 45H; stainless A2 or A4 |
| Finishes | Black oxide, zinc plated, plain stainless |
Made to order in China and shipped FOB or CIF from Tianjin, Ningbo, Shanghai or Shenzhen. Sizes, grades and finishes outside this list can be quoted.
Dimension drawing
Point types: which standard to order
| Point | DIN | ISO | Typical use |
|---|---|---|---|
| Flat | DIN 913 | ISO 4026 | Hardened shafts, repeated adjustment, minimal shaft damage |
| Cone | DIN 914 | ISO 4027 | Permanent location in a drilled seat |
| Dog | DIN 915 | ISO 4028 | Locating in a hole or slot |
| Cup | DIN 916 | ISO 4029 | General shaft locking; the most common choice |
Hex key and point sizes for DIN 913
Pitch is the ISO metric coarse thread. The hex key size is the same across the common sizes of these four standards; check the exact flat point diameter against the governing standard.
| Size | Pitch P (mm) | Hex key s (mm) | Flat point dp (mm) | Inquiry |
|---|---|---|---|---|
| M3 | 0.5 | 1.5 | 2 | Quote this size |
| M4 | 0.7 | 2 | 2.5 | Quote this size |
| M5 | 0.8 | 2.5 | 3.5 | Quote this size |
| M6 | 1.0 | 3 | 4 | Quote this size |
| M8 | 1.25 | 4 | 5.5 | Quote this size |
| M10 | 1.5 | 5 | 7 | Quote this size |
| M12 | 1.75 | 6 | 8.5 | Quote this size |
| M16 | 2.0 | 8 | 12 | Quote this size |
| M20 | 2.5 | 10 | 15 | Quote this size |
Choosing material and finish
- Alloy steel 45H is the usual choice for machinery. 45H is a hardness class, not a tensile class such as 8.8.
- Black oxide suits oiled indoor machinery; choose stainless A2 or A4 where corrosion matters.
- Stainless set screws are softer than 45H, so confirm the holding torque for the shaft.
Packing, shipping and documents
| MOQ | 500 pcs per specification; mixed sizes can be combined on one order |
|---|---|
| Lead time | 10–15 days for stock items, 25–30 days for production orders, confirmed in the quotation |
| Export packing | Inner boxes or bags labelled by size, export cartons, then palletized and stretch-wrapped; buyer labels and barcodes on request |
| Shipping ports | Tianjin, Ningbo, Shanghai, Shenzhen |
| Incoterms | EXW, FOB, CFR, CIF, DAP, DDP on request |
| HS code reference | HS 7318.15 is the usual heading for socket head cap screws. Confirm the final code with your customs broker. |
| Certificate of origin | ACFTA Form E available on request for buyers in ASEAN countries such as Malaysia, Indonesia, Vietnam and the Philippines |
| Order documents | Commercial invoice, packing list and inspection records agreed in the quotation |
What to include in your RFQ
- Standard or point type
- Size × length, e.g. M6 × 10
- Material: 45H, A2 or A4
- Finish
- Quantity per size, packing and destination
Frequently asked questions
What is the difference between a set screw and a grub screw?
They are the same product. Grub screw is the common name in the UK and Europe; set screw is the common name in the US.
What hex key fits an M6 set screw?
A 3 mm hex key for DIN 913 to 916 and ISO 4026 to 4029 set screws.
Which set screw point is best for a shaft?
A cup point (DIN 916) is the usual choice for general shaft locking. Use a flat point (DIN 913) when the shaft must not be marked or the screw is adjusted often.
What does 45H mean on a set screw?
45H is the hardness class for steel set screws. These screws are not given tensile classes such as 8.8 or 12.9.
What is the MOQ for set screws?
Reference MOQ is 500 pcs per specification. This product is made to order, so lead time and price are confirmed with each quotation. We reply to every RFQ within 2 working hours.