ISO 14587 Hexalobular Raised Countersunk Tapping Screws
ISO 14587 hexalobular socket raised countersunk (oval) head tapping screws — ST2,9 to ST6,3, the six-lobe drive on an oval countersunk head for sheet-metal threads, with the collected a/dk/f/k/y rows.
Last updated: 2026-11
Specifications
ISO 14587 carries the hexalobular drive into the self-tapping world: an oval (raised countersunk) head on a tapping-screw thread that cuts its own mating thread in sheet metal, plastic or thin-walled profiles. The tabulated data covers ST2,9 through ST6,3 with four geometry rows — shank run-out a, head diameter dk max, raised-face height f, head height k max — and the y row (thread-forming end length, Type C), which is the depth of the pointed, fluted entry that does the cutting. The oval head is the point of the series: it sits flush-ish like a countersunk screw but its crowned top leaves a rounded profile with no sharp edge, and it still leaves room for a deep six-lobe socket, so thin-sheet assemblies get torque-proof driving without a proud hex head. The tabulated data has clear limits — the hexalobular size/A/t rows and any length ladder are absent (flagged on the table), so drive tooling and lengths go per RFQ. Pair with the ST thread-chart page in this catalog for the tapped-hole side. Material, case hardness and finish are not tabulated — per RFQ (case-hardened steel is the norm for cutting its own thread; confirm at quotation).
| Standard | ISO 14587 — hexalobular socket raised countersunk (oval) head tapping screws |
|---|---|
| Size range | ST2,9 / ST3,5 / ST4,2 / ST4,8 / ST5,5 / ST6,3 |
| Head diameter | dk max: 6,3 (ST2,9) → 12,6 (ST6,3) mm |
| Head height / face | k max 1,7 → 3,15 mm; f 0,7 → 1,4 mm (the oval crown) |
| Thread-forming end | y, Type C: 2,6 (ST2,9) → 6 (ST6,3) mm |
| Drive | Hexalobular socket — size/A/t rows absent from the collected source, per RFQ |
| Material / hardness / finish | Not tabulated by the collected specification — per RFQ |
| thread | ST2,9 | ST3,5 | ST4,2 | ST4,8 | ST5,5 | ST6,3 |
|---|---|---|---|---|---|---|
| a | 1,1 | 1,3 | 1,4 | 1,6 | 1,8 | 1,8 |
| dk max. | 6,3 | 8,2 | 9,4 | 10,4 | 11,5 | 12,6 |
| f | 0,7 | 0,8 | 1 | 1,2 | 1,3 | 1,4 |
| k max. | 1,7 | 2,35 | 2,6 | 2,8 | 3 | 3,15 |
| y - TYPE C | 2,6 | 3,2 | 3,7 | 4,3 | 5 | 6 |
- Row 1 (a): Collected table is truncated against the standard's full sheet: no hexalobular size/A/t rows and no length/weight ladder in the source capture. Geometry rows above carried verbatim.
Materials
- Material and hardness specified per RFQ — tapping screws are normally case-hardened steel (surface ≥450 HV class per convention) or stainless; state the sheet thickness and substrate at quotation
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 14587 Hexalobular Raised Countersunk Tapping 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 y dimension tell me before I drive the screw?
It is the length of the business end. The y row (Type C) is the thread-forming tip — the tapered, fluted portion that actually cuts or forms the first threads in the sheet. It matters at two moments: when the screw finds the hole (a longer y self-centres more forgivingly) and when thin sheet is close to the head (the formed thread must clear the y zone before the full thread engages, or the joint strips). The tabulated ladder runs y from 2,6 mm at ST2,9 to 6 mm at ST6,3 — it scales with the thread, not the sheet. Your sheet thickness and pilot-hole choice decide the rest, and the ST thread chart in this catalog carries the mating hole side. Drive sizes, lengths, case hardness and coating are not tabulated (flagged verbatim on the table), so those all go on the RFQ rather than being guessed from a neighbouring series.
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