DIN 912 · ISO 4762
Socket Head Cap Screw
Class 12.9 alloy socket screw with a machined hex socket and controlled decarburisation. M5 to M20.
From
$0.098/pc
at 50,000 pcs
Specs
Family · Screws
Socket head, set and self-drilling screws.
Socket head cap screws to DIN 912 / ISO 4762, set screws to DIN 913 – 916 and self-drilling screws to DIN 7504, in classes 10.9 and 12.9 and A2/A4 stainless. Class 12.9 is supplied black oxide or zinc flake, never electroplated.
DIN 916
Hex Socket Set Screw
Cup-point set screw, class 45H, for locking shafts, collars and pulleys against rotation.
From
$0.042/pc
at 200,000 pcs
Specs
DIN 7504 K/N
Self-Drilling Screw
Case-hardened self-drilling screw that drills, taps and fastens 1–6 mm steel in one pass.
From
$0.013/pc
at 400,000 pcs
Specs
Specify it once
What to put on the drawing or the PO.
The four lines below decide whether the parts fit, hold and survive. Nine quoting delays out of ten are one of them missing.
- Head and drive: hex socket, Torx/hexalobular, button or countersunk — and the key size, because a shallow socket rounds off under torque.
- Point type for self-drilling: No. 2 for 1.5 – 3 mm steel, No. 3 for 3 – 5 mm, No. 5 for heavier sections.
- Coating that is compatible with the strength class: zinc flake for 10.9 and 12.9, electroplate only at 8.8 or below with a bake.
- Thread form for plastics and light alloy — thread-forming or thread-cutting, with the boss diameter it has to survive.
Where it goes wrong
Mistakes we see on incoming drawings.
We will flag these before production rather than after the first inspection. If a mistake is already in the drawing, we say so in writing on the quote.
- Electroplating 12.9 socket screws and calling it corrosion protection; the failure is delayed and brittle.
- Using a set screw that is too short for the hub, so the point bears on the shaft edge and the joint slips.
- Specifying a drill point by screw diameter instead of sheet thickness, which either walks or strips the hole.
Common questions
Screws — answered before you ask.
Something not covered? Email matrixgrowth@foxmail.com and a person answers, usually inside a shift.
Why can I not get class 12.9 zinc plated?
Because hydrogen from the plating bath migrates into a very hard, very stressed part and causes delayed brittle fracture. Zinc flake and black oxide avoid the bath entirely; where plating is unavoidable it needs a bake and a hydrogen embrittlement test to ISO 15330.
Which drill point for 3 mm steel?
No. 3 covers roughly 3 – 5 mm. No. 2 is for 1.5 – 3 mm and will struggle at the top of that range; the point determines the hole, not the screw diameter.
Do you supply Torx and hexalobular drives?
Yes, in the same classes and coatings. Torx is the better choice where the assembly torque is close to the drive limit — a hex socket of the same size cam-outs earlier.
Other families
What else leaves the same plant.
Next step
Send the standard number and the quantity.
You get unit price, MOQ, pack multiple, lead time and the Incoterm you buy on — within one business day, with the HS code for your broker.