ISO 7380-2 Flanged Hex Socket Button Head Screws
ISO 7380-2 hex socket button head screws with flange, M3 to M16 — the low-head flanged machine screw — with the full collected 8-size table: flange and head geometry, socket dimensions, key engagement and the printed minimum tensile loads for property classes 8.8 and 10.9.
Last updated: 2026-11
Specifications
ISO 7380-2 is the flanged version of the button head socket screw: the same low dome head and hex socket drive as ISO 7380-1, with an integral flange under the head that widens the bearing surface without adding head height. The flange does the work a washer would — load spreading on thin sheet, soft materials and oversized or slotted holes — while the shallow head keeps clearance low. The collected table runs M3 to M16 with the full flange geometry (flange diameter d c, flange thickness h), head and shank diameters, socket key width s and engagement t, and thread lengths b. It is also the one table in this batch that prints a mechanical figure: minimum tensile load rows for property classes 8.8 and 10.9 — from 3,220 N at M3 (8.8) to 130,000 N at M16 (10.9) — reproduced in the table with the source's ② marker. The ① markers on the socket columns carry no legend on the collected page and are shown as printed. For the washerless form see the ISO 7380-1 page; for a full-height socket head see ISO 4762/DIN 912. Other property classes, materials and finishes stay "per RFQ".
| Standard | ISO 7380-2 — hexagon socket button head screws with flange |
|---|---|
| Series | M3 – M16 (8 sizes tabulated) |
| Tabulated geometry | Per size: pitch P, flange thickness h, flange diameter d c, head diameter d k, shank diameter d s, socket across-corners e ①, head height k, key width s ①, key engagement t, thread length b |
| Strength data (printed by the source) | Minimum tensile load ② for property class 8.8: 3,220 N (M3) – 100,000 N (M16); class 10.9: 4,180 N (M3) – 130,000 N (M16) |
| Head / drive form | Low button head with integral flange, hex socket drive |
| Family note | Flanged counterpart of ISO 7380-1 button head; full-height socket head alternative ISO 4762 / DIN 912 |
| Materials / strength | Property classes 8.8/10.9 tabulated as minimum tensile load ②; other classes, materials and finishes per RFQ |
| Nominal thread | P — Pitch | h — max | h — min | d c — max | d c — min | d k — max | d k — min | d s — max | d s — min | e ① — min | k — max | k — min | s ① — Nominal Size | s ① — max | s ① — min | t — min | Minimum tensile load(N) ② — 8.8 | Minimum tensile load(N) ② — 10.9 | Length of Thread b |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 0.7 | 0.55 | 6.9 | 6.32 | 5.2 | 4.9 | 3 | 2.86 | 2.303 | 1.65 | 1.4 | 2 | 2.08 | 2.02 | 1.04 | 3220 | 4180 | 18 |
| M4 | 0.7 | 0.8 | 0.65 | 9.4 | 8.82 | 7.2 | 6.8 | 4 | 3.82 | 2.873 | 2.2 | 1.95 | 2.5 | 2.58 | 2.52 | 1.3 | 5620 | 7300 | 20 |
| M5 | 0.8 | 1 | 0.8 | 11.8 | 11.1 | 8.8 | 8.4 | 5 | 4.82 | 3.443 | 2.75 | 2.5 | 3 | 3.08 | 3.02 | 1.56 | 9080 | 11800 | 22 |
| M6 | 1 | 1.2 | 1 | 13.6 | 12.9 | 10 | 9.6 | 6 | 5.82 | 4.583 | 3.3 | 3 | 4 | 4.095 | 4.02 | 2.08 | 12900 | 16700 | 24 |
| M8 | 1.25 | 1.5 | 1.25 | 17.8 | 17.1 | 13.2 | 12.8 | 8 | 7.78 | 5.723 | 4.4 | 4.1 | 5 | 5.14 | 5.02 | 2.6 | 23400 | 30500 | 28 |
| M10 | 1.5 | 2 | 1.7 | 21.9 | 21.06 | 16.5 | 16.1 | 10 | 9.78 | 6.863 | 5.5 | 5.2 | 6 | 6.14 | 6.02 | 3.12 | 37100 | 48200 | 32 |
| M12 | 1.75 | 2.4 | 2.1 | 26 | 25.16 | 19.4 | 18.9 | 12 | 11.73 | 9.149 | 6.6 | 6.24 | 8 | 8.175 | 8.025 | 4.16 | 53900 | 70200 | 36 |
| M16 | 2 | 2.8 | 2.5 | 34 | 33 | 26 | 25.5 | 16 | 15.73 | 11.429 | 8.8 | 8.44 | 10 | 10.175 | 10.025 | 5.2 | 100000 | 130000 | 44 |
Materials
- Property classes 8.8 and 10.9 carry printed minimum tensile loads in the collected table (see specs and dimension table)
- Other property classes, stainless grades and finishes specified per RFQ
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (ISO 7380-2 Flanged Hex Socket Button Head Screws) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
What does the flange change compared with the plain button head (ISO 7380-1)?
Bearing area at unchanged head height. The flange spreads the clamp load over a wider diameter, so the screw holds on thin sheet, plastics, composites and oversize or elongated holes where a plain button head would pull through — and in most assemblies it removes the washer and its handling step. The trade is the flange diameter itself: check the d c column against adjacent features and counterbores. Head height and socket drive are the same family as ISO 7380-1, so wrenching and clearance behavior carry over.
How should the printed tensile loads be used in selection?
They are minimum tensile loads per property class — 8.8 and 10.9 — as printed in the collected table. Use them to size the screw against your joint's working load with the normal safety margin, and remember the clamp load a flanged head can carry into thin material is usually limited by bearing (pull-through), not by the screw's tensile capacity. Load cases outside the tabulated classes, and preload/torque figures, are confirmed at quotation.
What is the MOQ and lead time for these screws?
Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; non-stock diameters, lengths or finishes are quoted with a confirmed schedule. Common sizes in this designation are widely stocked — confirm the exact schedule against quantity and size mix at quotation.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support