DIN 923 Slotted Pan Head Screws
DIN 923 slotted pan head screws, M1.4 to M10 — the reference slotted pan head of the machine-screw family — with the full collected 10-size table: head and shank limits, slot geometry and thread lengths.
Last updated: 2026-11
Specifications
DIN 923 is the benchmark slotted pan head machine screw: a rounded head with a flat bearing circle, seated on the surface, driven by a simple blade — the form against which the small-head (DIN 920) and large-head (DIN 921) variants are measured. It is the default where a low-ish, forgiving head and the serviceability of a slot matter more than torque: electrical assemblies, housings, brackets, maintenance work where the right driver is always a flat blade away. The collected table runs M1.4 to M10 and tabulates per size: pitch P, thread length b as a minimum (the column that decides clamped-stack coverage), head diameter d k and shank d s each with max=nominal / min bands, head height k, slot width n and slot depth t with their limit bands. The shank d s band matters for drawings that pass the screw through close holes; the b minimum matters because everything stacked beyond it is clamped by thread only if the grip length is chosen accordingly. Materials, property classes and finishes are not printed by the collected specification and follow the drawing callout.
| Standard | DIN 923 — slotted pan head screws (standard head series) |
|---|---|
| Series | M1.4 – M10 (10 sizes tabulated) |
| Tabulated geometry | Per size: pitch P, thread length b min, head diameter d k (max=nominal / min), shank d s (max=nominal / min), head height k (Nominal / max / min), slot width n (Nominal / max / min), slot depth t (max / min) |
| Dimensions at M4 | Thread b min 6; head d k max=nominal 8.5 / min 8.28; shank d s max=nominal 5.5 / min 5.47; head height k nominal 2.4; slot n nominal 1 (1.06–1.2); slot depth t max 1.5 / min 1.3 |
| Dimensions at M10 | Thread b min 13.5; head d k max=nominal 20 / min 19.67; shank d s max=nominal 13 / min 12.957; head height k nominal 4.6; slot n nominal 2.5 (2.56–2.81); slot depth t max 2.8 / min 2.3 |
| Head / drive form | Standard pan head with slotted drive — the reference head of the slotted machine-screw family |
| Materials / strength | Not tabulated by the collected specification — per RFQ (property class and finish per drawing callout) |
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 (DIN 923 Slotted 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
The b column prints a single minimum — how do I read thread length from it?
The collected table states b as a minimum, meaning the thread must reach at least that length from the bearing face; the actual grip length is then chosen per assembly from the standard’s length ladder at quotation. The reading rule for drawings: your total clamped stack (head seat to thread start) must be no longer than the screw’s shank, and the material left to be threaded must be within b — at M4 that is at least 6 mm of thread. If your clamped plate is thicker than the shank of any listed length, the thread starts inside the clearance hole and the joint loses its pilot and shear face; the fix is the next length up or, on thicker stacks, the shanked DIN 427 which exists precisely for that split. State both the length and the grip split explicitly when quoting a shanked or partial-thread requirement.
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