ISO 14583 Hexalobular Socket Pan Head Screws
ISO 14583 pan head screws with hexalobular (TORX-style) socket, M2 to M10 — the high-torque pan head machine screw — with the full collected 9-size table: head geometry, socket size and engagement depth, thread-end runout and thread lengths.
Last updated: 2026-11
Specifications
ISO 14583 is the pan head machine screw driven by a hexalobular socket — the TORX-style recess that drives at markedly higher torque than cross-recess Phillips without cam-out, which is why it has become the default recess on pre-assembled and automated lines. The pan head is the low-profile dome that sits on the surface without countersinking, with a slightly larger bearing diameter than a cheese head of the same thread. The collected table runs M2 to M10 and tabulates the pair you cannot mix up on the shop floor: the Socket No. (T6 through T50, growing with the thread) and the minimum engagement depth t that keeps the recess from stripping — plus head diameter d k, head height k, the a/x runout and lash limits at the thread end, and the thread length b for each size. For assembly planning, the A column (Ref.) gives the socket driving dimension the tooling chart needs. The cross-recessed pan head counterpart is DIN 7985 on this site; the socket-cap alternative is DIN 912. Materials, property classes and finishes are not printed by the collected specification and follow the drawing callout.
| Standard | ISO 14583 — pan head screws with hexalobular socket (TORX-style recess) |
|---|---|
| Series | M2 – M10 (9 sizes tabulated) |
| Tabulated geometry | Per size: pitch P, runout a, head diameter d k, head height k, thread-end lash x, socket size (T6–T50), socket driving dimension A (Ref.), engagement depth t, fillet r, thread length b |
| Head / drive form | Pan head (surface-seated dome), hexalobular socket drive — high torque without cam-out |
| Family note | Hexalobular counterpart of the DIN 7985 cross-recess pan head; socket-cap alternative DIN 912 |
| Materials / strength | Not tabulated by the collected specification — per RFQ (property class and finish per drawing callout) |
| Nominal thread | P — Pitch | a — max | d k — max=nominal size | d k — min | k — max=nominal size | k — min | x — max | Socket No. | A — Ref. | t — max | t — min | r — min | Length of Thread b |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M2 | 0.4 | 0.8 | 4 | 3.7 | 1.6 | 1.46 | 1 | T6 | 1.75 | 0.77 | 0.63 | 0.1 | 16 |
| M2.5 | 0.45 | 0.9 | 5 | 4.7 | 2.1 | 1.96 | 1.1 | T8 | 2.4 | 1.04 | 0.91 | 0.1 | 18 |
| M3 | 0.5 | 1 | 5.6 | 5.3 | 2.4 | 2.26 | 1.25 | T10 | 2.8 | 1.27 | 1.01 | 0.1 | 19 |
| (M3.5) | 0.6 | 1.2 | 7 | 6.64 | 2.6 | 2.46 | 1.5 | T15 | 3.35 | 1.33 | 1.07 | 0.1 | 20 |
| M4 | 0.7 | 1.4 | 8 | 7.64 | 3.1 | 2.92 | 1.75 | T20 | 3.95 | 1.66 | 1.27 | 0.2 | 22 |
| M5 | 0.8 | 1.6 | 9.5 | 9.14 | 3.7 | 3.52 | 2 | T25 | 4.5 | 1.91 | 1.52 | 0.2 | 25 |
| M6 | 1 | 2 | 12 | 11.57 | 4.6 | 4.3 | 2.5 | T30 | 5.6 | 2.42 | 2.02 | 0.25 | 28 |
| M8 | 1.25 | 2.5 | 16 | 15.57 | 6 | 5.7 | 3.2 | T45 | 7.95 | 3.18 | 2.79 | 0.4 | 34 |
| M10 | 1.5 | 3 | 20 | 19.48 | 7.5 | 7.14 | 3.8 | T50 | 8.95 | 4.02 | 3.62 | 0.4 | 40 |
Materials
- Material, property class and finish specified per RFQ — the collected specification table covers geometry only
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 14583 Hexalobular Socket Pan 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
Why specify a hexalobular socket over a cross-recess on a pan head screw?
Torque transfer. The lobular drive engages six radial walls, so driver torque goes into rotation instead of slipping out of the recess — the cam-out behavior that limits cross-recess screws. In assembly lines and pre-assembled units that means higher seating torques, fewer driver changes, and less recess wear on reused fasteners. The cost is tooling specificity: the table's Socket No. column (T6–T50) must match the driver exactly, and the minimum engagement depth t is what prevents recess stripping at those higher torques.
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