DIN 316 Wing Screws with Rounded Wings
DIN 316 wing screws with rounded wings, M4 to M12 — the classic two-wing hand knob in die-cast form — with the full collected 6-size table: wing span, wing thickness, hub geometry and grip dimensions.
Last updated: 2026-11
Specifications
DIN 316 is the wing screw most people picture when they hear the word: two rounded wings projecting from a moulded hub, sized for a full-finger grip so a clamp or cover can be tightened hard by hand without pinch points. The rounded wing form is the ergonomic end of the family — compared with the flat, blade-like wings of DIN 317, the rounded profile spreads finger pressure and survives handling and re-handling in jigs, tooling, medical and laboratory equipment, and any enclosure that is adjusted in service. The collected table runs M4 to M12 and tabulates the grip system per size: the wing envelope d 2 and inner d 3 with max/min bands, the overall wing span e (up to 33 mm at M12), wing thickness m, wing height h, the grip-related G and g dimensions, thread length a, and the fillet radii that keep the wing roots from stress-concentrating. Where a fixed torque matters, note that hand torque on wings varies by operator — for calibrated clamping a knurled thumb screw with a torque procedure is the better call. Materials, property classes and finishes are not printed by the collected specification and follow the drawing callout.
| Standard | DIN 316 — wing screws with rounded wings (two-wing hand knob) |
|---|---|
| Series | M4 – M12 (6 sizes tabulated) |
| Tabulated geometry | Per size: pitch P, wing envelope d 2 (max / min), inner wing d 3 (max / min), wing span e (max / min), grip g and G (max / min), wing height h (max / min), wing thickness m (max / min), thread length a max, radii r 1–r 4 (Ref.) |
| Dimensions at M6 | Wing envelope d 2 max 13 / min 10; inner d 3 max 11 / min 9; span e max 26 / min 24; height h max 13 / min 11; thickness m max 6.5 / min 4; thread a max 2.4 |
| Dimensions at M12 | Wing envelope d 2 max 25 / min 21; span e max 33 / min 30; height h max 17 / min 15; thickness m max 8 / min 6 |
| Grip form | Two rounded wings for full-finger hand tightening without tools |
| 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 316 Wing Screws with Rounded Wings) 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 rounded wings over the flat wing form?
The wing profile decides how the hand experiences the screw. Rounded wings (DIN 316) put a comfortable, closed contour under the fingertips — the collected e span and m thickness columns show a proportioned grip, not a cutting edge — so they survive frequent manual adjustment and are the form used where operators handle the screw repeatedly or where gloves are worn. Flat wings hold marginally more torque per gram of material but dig into fingers, which is why they tend to end up under-tightened in service. If your assembly is adjusted by end users rather than by tooling, the rounded form pays for itself in consistent hand torque; if the screw is set once by a fitter and then left, either form holds.
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