Socket Head Cap Screws

ISO 7380 Button Head Socket Screw

Low-profile domed head socket screw to ISO 7380-1 (ISO 7380-2 with flange). The rounded head has no sharp edges, so it is used on guards, covers, furniture and anywhere a neat, snag-free finish is needed.

Standard: ISO 7380-1 / ISO 7380-2
Equivalents: ASME B18.3 button head (inch)
Sizes: M3 – M12
Lengths: 6 – 60 mm
Grades: 10.9, A2-70, A4-70
Materials: Alloy steel; Stainless 304 / 316
Thread: Metric coarse 6g
MOQ: 500 pcs per size (negotiable for trial orders)

Dimensions

Button head dimensions (ISO 7380-1)
Size	Head Ø dk (mm)	Head height k (mm)	Hex s (mm)
M3	5.7	1.65	2
M4	7.6	2.2	2.5
M5	9.5	2.75	3
M6	10.5	3.3	4
M8	14	4.4	5
M10	17.5	5.5	6
M12	21	6.6	8

Nominal values in mm for reference. Final dimensions and tolerances follow the referenced standard.

Finishes

Finish	Applied	Notes
Black oxide / phosphate	Available	Indoor or oiled service
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.

Features

Smooth, snag-free head
Low head height
Flanged version spreads load

Applications

Machine guards and covers
Furniture and fitness equipment
Automotive trim

Ordering terms

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

ISO 7380 Button Head Screw FAQ

What torque can button head screws take?

Less than DIN 912 because of the shallower socket; use DIN 912 where full 10.9 preload is required.

Request a quote for ISO 7380 Button Head Screw

Tell us size, grade, finish and quantity. We reply with price and lead time within 24 hours.