ASME B18.6.9 Wing Nuts (Inch Series)
ASME B18.6.9 wing nuts, inch series #3 – 3/4 in — the hand-tightened nut in the cold-forged solid pattern (Type A), with the collected per-size chart across the Light / Regular / Heavy series: wing spread, wing height, wing thickness, between-wings, boss diameter and boss height at max/min.
Last updated: 2026-11
Specifications
The wing nut converts thread tightening into a finger operation: two wings give thumb-and-forefinger leverage, no driver, no wrench, and a joint meant to be set and released by hand — fixture knobs, battery and panel hold-downs, formwork, anything adjusted more often than it is torqued. The collected chart is the cold-forged solid pattern (the source classifies it as Type A: solid nuts with wings of moderate height), run in three wing-proportion series — Light, Regular and Heavy — so the same thread size comes in three hand-engagement sizes. That series column is the chart's real content: at 1/4-20, Light carries a 1.10–0.97 in wing spread and 0.18–0.14 in wing thickness, Regular steps to 1.25–1.12 spread, and Heavy to 1.44–1.31 spread with 0.24–0.20 in wings. Per row the chart prints wing spread A, wing height B, wing thickness C, between-wings D, boss diameter E and boss height G at max/min, plus the coarse and fine thread ladders each size is available in (#3 through 3/4 in; the heaviest series at the large end is Heavy-only). Reading rules: D (between wings) is the clearance for gloved or plier-assisted grip; C (wing thickness) is what stands against the hand load, and it is why the Heavy series exists for assemblies adjusted repeatedly or tightened hard by hand. The source marks preferred sizes in bold; the markers do not survive text conversion and are carried as a table footnote. Materials and finishes are not tabulated by the collected specification — per RFQ.
| Standard | ASME B18.6.9-2010 — wing nuts, inch series (chart covers the cold-forged/cold-formed solid pattern, Type A per the source's classification note; stamped and other patterns are separate standards types) |
|---|---|
| Size range | Nominal #3 – 3/4 in, twenty-seven chart rows across Light / Regular / Heavy series; thread ladders per row list coarse and fine TPI (e.g. 1/4: 20 and 28; 5/8: 11 and 18, Heavy only at the large end) |
| Tabulated geometry | Per row: wing spread A (max/min), wing height B, wing thickness C, between wings D, boss diameter E, boss height G — e.g. 1/4-20 Regular: A 1.25–1.12, B 0.66–0.53, C 0.21–0.17, D 0.39–0.32, E 0.58–0.51, G 0.25–0.20 |
| Series ladder | Light / Regular / Heavy are wing-proportion series, not strength grades: at 1/4-20 the spread runs 1.10 (Light) → 1.25 (Regular) → 1.44 (Heavy) and wing thickness 0.18 → 0.21 → 0.24 — larger wings for harder hand tightening, same thread |
| Preferred sizes | The source marks preferred sizes in bold; bold does not survive text conversion (table footnote) — confirm preferred status against the standard before relying on it for stock decisions |
| Materials / finishes | Not tabulated by the collected specification — per RFQ (state material and finish at quotation) |
| Nominal Size (Basic Major Dia.) | Threads per Inch | Series | A — Wing Spread (max) | A (min) | B — Wing Height (max) | B (min) | C — Wing Thickness (max) | C (min) | D — Between Wings (max) | D (min) | E — Boss Dia. (max) | E (min) | G — Boss Height (max) | G (min) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 (0.0990) | 48 56 | Heavy | 0.72 | 0.59 | 0.41 | 0.28 | 0.11 | 0.07 | 0.21 | 0.17 | 0.33 | 0.29 | 0.14 | 0.10 |
| 4 (0.1120) | 40 48 | Heavy | 0.72 | 0.59 | 0.41 | 0.28 | 0.11 | 0.07 | 0.21 | 0.17 | 0.33 | 0.29 | 0.14 | 0.10 |
| 5 (0.1250) | 40 44 | Light | 0.72 | 0.59 | 0.41 | 0.28 | 0.11 | 0.07 | 0.21 | 0.17 | 0.33 | 0.29 | 0.14 | 0.10 |
| 5 (0.1250) | 40 44 | Heavy | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.27 | 0.22 | 0.43 | 0.39 | 0.18 | 0.14 |
| 6 (0.1380) | 32 40 | Light | 0.72 | 0.59 | 0.41 | 0.28 | 0.11 | 0.07 | 0.21 | 0.17 | 0.33 | 0.29 | 0.14 | 0.10 |
| 6 (0.1380) | 32 40 | Heavy | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.27 | 0.22 | 0.43 | 0.39 | 0.18 | 0.14 |
| 8 (0.1640) | 32 36 | Light | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.27 | 0.22 | 0.43 | 0.39 | 0.18 | 0.14 |
| 8 (0.1640) | 32 36 | Heavy | 1.10 | 0.97 | 0.57 | 0.43 | 0.18 | 0.14 | 0.33 | 0.26 | 0.50 | 0.45 | 0.22 | 0.17 |
| 10 (0.1900) | 24 32 | Light | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.27 | 0.22 | 0.43 | 0.39 | 0.18 | 0.14 |
| 10 (0.1900) | 24 32 | Heavy | 1.10 | 0.97 | 0.57 | 0.43 | 0.18 | 0.14 | 0.33 | 0.26 | 0.50 | 0.45 | 0.22 | 0.17 |
| 12 (0.2160) | 24 28 | Light | 1.10 | 0.97 | 0.57 | 0.43 | 0.18 | 0.14 | 0.33 | 0.26 | 0.50 | 0.45 | 0.22 | 0.17 |
| 12 (0.2160) | 24 28 | Heavy | 1.25 | 1.12 | 0.66 | 0.53 | 0.21 | 0.17 | 0.39 | 0.32 | 0.58 | 0.51 | 0.25 | 0.20 |
| 1/4 (0.2500) | 20 28 | Light | 1.10 | 0.97 | 0.57 | 0.43 | 0.18 | 0.14 | 0.33 | 0.26 | 0.50 | 0.45 | 0.22 | 0.17 |
| 1/4 (0.2500) | 20 28 | Regular | 1.25 | 1.12 | 0.66 | 0.53 | 0.21 | 0.17 | 0.39 | 0.32 | 0.58 | 0.51 | 0.25 | 0.20 |
| 1/4 (0.2500) | 20 28 | Heavy | 1.44 | 1.31 | 0.79 | 0.65 | 0.24 | 0.20 | 0.48 | 0.42 | 0.70 | 0.64 | 0.30 | 0.26 |
| 5/16 (0.3125) | 18 24 | Light | 1.25 | 1.12 | 0.66 | 0.53 | 0.21 | 0.17 | 0.39 | 0.32 | 0.58 | 0.51 | 0.25 | 0.20 |
| 5/16 (0.3125) | 18 24 | Regular | 1.44 | 1.31 | 0.79 | 0.65 | 0.24 | 0.20 | 0.48 | 0.42 | 0.70 | 0.64 | 0.30 | 0.26 |
| 5/16 (0.3125) | 18 24 | Heavy | 1.94 | 1.81 | 1.00 | 0.87 | 0.33 | 0.26 | 0.65 | 0.54 | 0.93 | 0.86 | 0.39 | 0.35 |
| 3/8 (0.3750) | 16 24 | Light | 1.44 | 1.31 | 0.79 | 0.65 | 0.24 | 0.20 | 0.48 | 0.42 | 0.70 | 0.64 | 0.30 | 0.26 |
| 3/8 (0.3750) | 16 24 | Regular | 1.94 | 1.81 | 1.00 | 0.87 | 0.33 | 0.26 | 0.65 | 0.54 | 0.93 | 0.86 | 0.39 | 0.35 |
| 7/16 (0.4375) | 14 20 | Light | 1.94 | 1.81 | 1.00 | 0.87 | 0.33 | 0.26 | 0.65 | 0.54 | 0.93 | 0.86 | 0.39 | 0.35 |
| 7/16 (0.4375) | 14 20 | Heavy | 2.76 | 2.62 | 1.44 | 1.31 | 0.40 | 0.34 | 0.90 | 0.80 | 1.19 | 1.13 | 0.55 | 0.51 |
| 1/2 (0.5000) | 13 20 | Light | 1.94 | 1.81 | 1.00 | 0.87 | 0.33 | 0.26 | 0.65 | 0.54 | 0.93 | 0.86 | 0.39 | 0.35 |
| 1/2 (0.5000) | 13 20 | Heavy | 2.76 | 2.62 | 1.44 | 1.31 | 0.40 | 0.34 | 0.90 | 0.80 | 1.19 | 1.13 | 0.55 | 0.51 |
| 9/16 (0.5625) | 12 18 | Heavy | 2.76 | 2.62 | 1.44 | 1.31 | 0.40 | 0.34 | 0.90 | 0.80 | 1.19 | 1.13 | 0.55 | 0.51 |
| 5/8 (0.6250) | 11 18 | Heavy | 2.76 | 2.62 | 1.44 | 1.31 | 0.40 | 0.34 | 0.90 | 0.80 | 1.19 | 1.13 | 0.55 | 0.51 |
| 3/4 (0.7500) | 10 16 | Heavy | 2.76 | 2.62 | 1.44 | 1.31 | 0.40 | 0.34 | 0.90 | 0.80 | 1.19 | 1.13 | 0.55 | 0.51 |
- Row 1 (3 (0.0990)): The source marks preferred sizes in bold within the table; bold formatting does not survive text conversion, so preferred status is not visible here.
Materials
- Material and finish specified per RFQ — hand-torqued joints still need the material to match the environment (steel, stainless, brass are common; none are tabulated in the collected chart)
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 (ASME B18.6.9 Wing Nuts (Inch Series)) 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
What is the difference between the Light, Regular and Heavy series, and how tight can a wing nut actually be?
The series columns are grip geometry, not strength grades. The thread does not change across the series at a given size — the wings do. At 1/4-20: Light spreads 1.10–0.97 in with 0.18–0.14 in thick wings; Regular spreads 1.25–1.12 with 0.21–0.17 wings; Heavy spreads 1.44–1.31 with 0.24–0.20 wings. The numbers to read for duty: wing thickness C is what resists bending when fingers (or a mallet-assisted palm) drive the nut hard, and between-wings D is the clearance for how the nut is gripped — 0.33–0.26 in on the Heavy 1/4 versus 0.26–0.22 on the Light, which is the difference between a bare-finger job and a gloved or plier-accessible one. Choose Light for occasionally adjusted, low-stakes settings (access panels, thread protectors); Regular for the general run of fixture and hold-down work; Heavy where the joint is re-tightened often, tightened hard by hand, or where the wings themselves take handling abuse. On the torque question, stay honest: no figure on the collected chart converts hand torque to clamp load — a wing nut's clamp is only as repeatable as the operator's grip, which is exactly why the pattern belongs on joints that need positive seating, not calibrated preload. Where clamp load matters, the same thread in a hex nut with a torque wrench is the right tool; where frequent hand adjustment is the point, pick the series by the A/B/C/D/E/G columns and quote thread series and material explicitly, since neither is tabulated by the collected specification.
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 sizes in this nut type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
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