Socket Head Cap Screws

Hexagon socket screws for tooling, moulds, machinery and automotive assemblies where head space is limited: DIN 912 / ISO 4762 cylinder-head cap screws and ISO 7380 button-head screws. Alloy steel in 8.8, 10.9 and 12.9, or A2/A4 stainless. Black oxide is the default for 12.9; zinc and zinc-nickel are used where corrosion protection matters, with embrittlement relief agreed for 10.9 and above.

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Socket Head Cap Screws we supply

DIN 912 Socket Cap Screw – representative photo

DIN 912 Socket Head Cap Screw

ISO 7380 Button Head Socket Screw

Socket Head Cap Screws: standards, sizes and options
Product / standard	Sizes	Grades	Material	Finishes	MOQ
DIN 912 / ISO 4762 DIN 912 Socket Cap Screw	M3 – M24	8.8, 10.9, 12.9, A2-70, A4-80	Alloy steel SCM435 / 35CrMo; Stainless 304 / 316	Black oxide / phosphate, Zinc flake (Dacromet/Geomet type), Zinc-nickel, Zinc plated	500 pcs / size
ISO 7380-1 / ISO 7380-2 ISO 7380 Button Head Screw	M3 – M12	10.9, A2-70, A4-70	Alloy steel; Stainless 304 / 316	Black oxide / phosphate, Zinc-nickel, Zinc plated	500 pcs / size

Ordering socket head cap screws

MOQ: 500 pcs per size (negotiable for trial orders)
Mixed sizes: Welcome in one order
Samples: Samples available — cost and lead time quoted per request
Lead time: 15–25 days for standard parts; finishes such as HDG or Dacromet add a few days
Payment: T/T 30% deposit, 70% before shipment
Shipping: FOB Ningbo / CIF / DDP on request
Packaging: Cartons on pallets, or private-label boxes and bags
Documents: Material certificate, coating thickness and salt-spray reports on request
Custom: Drawings, non-standard sizes, coatings, marking and private-label packaging

To quote quickly, please send

Standard (e.g. DIN, ISO, ASTM) or drawing number
Size × length and thread pitch
Property class / grade and material
Finish and coating thickness (or the salt-spray hours you need)
Quantity per size and annual volume
Packaging and destination port

Finishes for socket head cap screws

Zinc-nickel and zinc are plated on our own line in Ningbo. Other finishes are applied by specialist coaters to the relevant standard.

Finish	Applied	Notes
Black oxide / phosphate	Available	Indoor or oiled service
Zinc flake (Dacromet/Geomet type)	Available	Electrolyte-free, no hydrogen embrittlement risk
Zinc-nickel	Our own line	12–15 µm, clear or black passivation; 1,000 h (12 µm) to 1,440 h (15 µm) neutral salt spray
Zinc plated	Our own line	Clear/blue, yellow or black passivation

For property class 10.9 and above, choose zinc flake, or zinc-nickel with hydrogen-embrittlement relief agreed at order stage.

Row of zinc-nickel electroplating tanks — Our zinc-nickel plating line. Salt spray: 12 µm ≈ 1,000 h, 15 µm ≈ 1,440 h (neutral salt spray to first red rust). How zinc-nickel compares

How to choose

Cylinder head or button head?: DIN 912 carries the full rated load. ISO 7380 button heads have a lower, rounded profile for covers and guards but a lower recommended tightening torque.
Plated 12.9 screws?: 12.9 is sensitive to hydrogen embrittlement. Prefer black oxide or zinc flake; electroplating only with baking and a customer-approved process.

Request a socket head cap screw quote

Send sizes and quantities — we reply with price, finish options and lead time within 24 hours.