ISO 15071 Hexalobular Socket Raised Countersunk Tapping Screws
ISO 15071 hexalobular socket raised countersunk (oval) head tapping screws M5 to M16 — the Torx-driven tapping screw with a slightly proud oval head, with the collected b/dc/ds/k/s/h geometry ladder.
Last updated: 2026-11
Specifications
This is the tapping screw for panel work where a flush head is wanted but the edge of the countersink must not bite: the raised (oval) crown sits a hair above the surface with a rounded top, and the hexalobular socket drives it with far less cam-out than a cross recess on long run-ins. The collected ladder covers M5 to M16 with thread engagement b min. (16 → 38 mm), head diameter dc max. (11,4 → 32,8), shank ds max., head height k max. (5,6 → 15,2) and the source's s and h rows (s max. 7 → 21, h min. 1 → 2,4). One reading caution, carried verbatim as an anomaly flag: the page title says tapping screws but the thread labels read M5-M16 in machine-thread style, and the s column is unlegended — confirm the exact drive series and thread form per RFQ before tooling up. Property class, material and finish are not tabulated — per RFQ (state the host sheet thickness; tapping duty usually wants case-hardened steel).
| Standard | ISO 15071 — hexalobular socket raised countersunk (oval) head tapping screws |
|---|---|
| Size range | M5 – M16 in the collected ladder (source thread labels carried verbatim) |
| Head geometry | dc max. 11,4 → 32,8 mm; k max. 5,6 → 15,2; raised (oval) crown, countersunk base |
| Thread engagement | b min.: 16 → 38 mm across the ladder |
| Flagged verbatim | s max. (7 → 21) and h min. (1 → 2,4) rows are unlegended on the collected page; title/label tension flagged — confirm per RFQ |
| Material / finish | Not tabulated by the collected specification — per RFQ |
| thread d | M5 | M6 | M8 | M10 | M12 | M16 |
|---|---|---|---|---|---|---|
| b min. | 16 | 18 | 22 | 26 | 30 | 38 |
| dc max. | 11,4 | 13,6 | 17 | 20,8 | 24,7 | 32,8 |
| ds max. | 5 | 6 | 8 | 10 | 12 | 16 |
| k max. | 5,6 | 6,9 | 8,5 | 9,7 | 12,1 | 15,2 |
| s max. | 7 | 8 | 10 | 13 | 15 | 21 |
| h min. | 1 | 1,1 | 1,2 | 1,5 | 1,8 | 2,4 |
- Row 5 (s max.): the s max. row is unlegended on the collected page and the thread labels (M5-M16) sit in tension with the page title ('tapping screws'); both are reproduced verbatim - confirm the drive series per RFQ before ordering
Materials
- Material and finish specified per RFQ — tapping duty commonly runs case-hardened steel; state the host sheet material and thickness, the corrosion exposure, and confirm the drive series at quotation (the collected page labels the s column without a legend)
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 15071 Hexalobular Socket 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
Why choose a raised countersunk oval head over a flat countersunk tapping screw?
When the countersink is not perfectly matched to the head angle. A flat countersunk head either sits proud at the rim or sinks too deep when the hole is oversize; the oval crown tolerates that mismatch by design — the rounded top stays presentable on visible panels while the 90-degree base still seats. The hexalobular socket adds the other half of the case: high torque transfer into sheet metal without the driver twisting out, which matters on the larger ladder sizes (M12/M16, where the collected dc max. reaches 32,8 mm). Check the flagged rows before ordering: the collected page labels its s and h columns without legends and titles the series a tapping screw while printing M-style thread labels — both are reproduced verbatim here, and the practical rule is to confirm drive series, thread form and finish per RFQ. The collected geometry ladder (b 16 → 38, k max. 5,6 → 15,2) is solid for hole prep and clearance work.
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