DIN 315 Wing Nuts
Metric wing nuts (butterfly nuts) per DIN 315, German type — two rounded wings for hand tightening, M4 to M24 in steel and stainless steel A2/A4. No wrench needed: fast, tool-free clamping for quick-release and frequently serviced joints.
Last updated: 2026-11
Specifications
The wing nut is the fastening you operate without tools: two rounded wings give thumb and forefinger enough leverage to run the nut down and clamp it by hand — which is what makes quick-release covers, clamping handles, adjustment points and frequently serviced joints practical. DIN 315 is the metric wing-nut standard of the German type, with two rounded wing-like projections; the collected dimensions table runs from M4 to M24, supplied in steel and stainless steel A2 and A4. The standard has no ISO successor: DIN standards continue to be used for parts with no ISO equivalent, and wing nuts are named as exactly that case, so DIN 315 remains the ordering designation. A wing nut holds by hand pressure, not by wrench torque — it belongs where the clamp is set and released by hand, not in torque-specified or vibration-critical joints. The collected table tabulates per-size values for D2, E, G, H and A; see the worked M10 row in the specification.
| Standard | DIN 315 — metric wing nuts (butterfly nuts), German type, two rounded wings |
|---|---|
| Size range | M4 – M24 |
| Dimensions at M10 | D2 max 20.0 mm; E max 51.0 mm; G max 4.9 mm; H max 25.0 mm; A 20 mm |
| Materials | Steel and stainless steel A2 / A4 |
| Operation | Turned by thumb and forefinger — no wrench; quick hand tensioning and clamping |
| Standard status | DIN 315 has no ISO equivalent — the DIN designation remains in use for wing nuts |
| Nominal thread | Pitch, coarse (mm) | dk max (mm) | dk min (mm) | ds max (mm) | ds min (mm) | L max (mm) | L min (mm) | y max (mm) | y min (mm) | y1 max (mm) | y1 min (mm) | Height k max (mm) | k min (mm) | Height m max (mm) | m min (mm) | r ≈ (mm) | R ≈ (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M4 | 0.7 | 8 | 6 | 7 | 5.5 | 20 | 18 | 1.9 | 1.1 | 2.3 | 1.7 | 10.5 | 8.5 | 4.6 | 3.2 | 2 | 3 |
| M5 | 0.8 | 11 | 8 | 9 | 7.5 | 26 | 24 | 2.3 | 1.5 | 2.8 | 2.3 | 13 | 11 | 6.5 | 4 | 2.5 | 4 |
| M6 | 1 | 13 | 10 | 11 | 9 | 33 | 30 | 2.3 | 1.5 | 3.3 | 2.7 | 17 | 15 | 8 | 5 | 3 | 5 |
| M8 | 1.25 | 16 | 13 | 12.5 | 10.5 | 39 | 36 | 2.8 | 2 | 4.4 | 3.6 | 20 | 18 | 10 | 6.5 | 3 | 6 |
| M10 | 1.5 | 20 | 17 | 16.5 | 14.5 | 51 | 48 | 4.4 | 3.6 | 5.4 | 4.6 | 25 | 23 | 12 | 8 | 5 | 8 |
| M12 | 1.75 | 23 | 20 | 19.5 | 17.5 | 65 | 62 | 4.9 | 4.1 | 6.4 | 5.6 | 33.5 | 31 | 14 | 10 | 6 | 10 |
| M16 | 2 | 29 | 26 | 23 | 21 | 73 | 70 | 6.4 | 5.6 | 7.5 | 6.5 | 37.5 | 35 | 17 | 13 | 7 | 11 |
| M20 | 2.5 | 35 | 32 | 29 | 27 | 90 | 86 | 6.9 | 6.1 | 8 | 7 | 46.5 | 44 | 21 | 16 | 8 | 14 |
| M24 | 3 | 44 | 41 | 37.5 | 35 | 110 | 106 | 9.4 | 8.6 | 10.5 | 9.5 | 56.5 | 53.5 | 25 | 20 | 9 | 18 |
Materials
- Steel
- Stainless steel
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 315 Wing Nuts) 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
When is a wing nut the right choice — and when is it not?
Wherever the clamp is set and released by hand: quick-release covers, handles, adjustment points, anything assembled often without tools. The two rounded wings give thumb and forefinger the leverage for fast hand tightening and release. What wing nuts do not suit are torque-specified or vibration-critical joints — they hold by hand pressure, not by installation torque; there, a hex nut or a lock nut remains the right choice.
Is DIN 315 still the current designation for wing nuts?
Yes. The collected supplier reference notes that DIN standards continue to be used for parts which do not have ISO equivalents — naming DIN 315 wing nuts as that case — so there is no ISO number to migrate to. Order to DIN 315 and the thread size; drawings that carry a wing-nut callout without a standard number should be confirmed against the DIN 315 dimension pattern before production.
What is the MOQ and lead time for this nut type?
The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common diameters in this nut type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for this nut type state?
State the standard designation (for example DIN 985 or DIN 6923), nominal thread size and pitch (metric coarse unless fine pitch is required), material and strength pairing with the mating bolt, finish (plain, zinc, or hot-dip galvanized where compatible), required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.
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