Wing nut

01

Choose the standard and type of manufacture

ASME B18.6.9 (Wing Nuts, Inch Series) covers complete general and dimensional data for nine types and styles of wing nuts; thumb screws and wing screws are covered by ASME B18.6.8. [1]

AFT Fasteners describes four types: Type A cold-forged from steel or stainless steel for strength, Type B hot-forged, Type C die-cast, and Type D stamped from carbon steel sheet with hollow wings, slightly less strong but more cost-effective. It says wing nuts suit frequent assembly and disassembly, such as access panels, adjustable furniture and marine hardware, and applications needing minimal torque because they are tightened by hand. [2]

Haiyan Bolt lists wing nuts (butterfly nuts) to DIN 315 and ASME, describing a hexagonal or square body with two flat wings for grip. [3]

In metric practice DIN 315 (July 1998, superseding the June 1983 edition) covers wing nuts with a round wing shape in steel, malleable iron, austenitic steel and copper-zinc alloy, sizes M4 to M24, product class C. DIN 314 (September 1999) covers the edged wing shape, which the reproducing site calls close to the American form, in the same material groups and sizes M4 to M12, also product class C. [4] [5]

Give the supplier the standard and type (cold-forged, hot-forged, die-cast or stamped), thread and size, material, finish, quantity, any locking (nylon insert) requirement and packaging.

02

Fix the size, material and finish

AFT lists wing nuts in SAE and metric sizes from #6-32 to 5/8 in-11 and M3-0.50 to M18-2.50, in stainless steel, steel or nylon, with plain or zinc Cr+3 finish. [2]

The DIN 315 table gives each size's pitch with maximum and minimum limits for wing span e, height h, hub diameter D1, wing thickness g and nut body height m. For M8 (pitch 1.25 mm) these are e 36–39 mm, h 18–20 mm, D1 13–16 mm, g 2–2.8 mm and m 6.5–10 mm. For M12 (pitch 1.75 mm) they are e 62–65 mm, h 31–35.5 mm and m 10–14 mm, and for M24 (pitch 3 mm) e 106–110 mm and h 53.5–56.5 mm. [4]

The edged-wing DIN 314 nut is smaller across the wings at the same thread: for M8 it gives e 35–38 mm, h 17–19 mm and m 6.5–8.5 mm, and for M12 e 63–66 mm and h 29–32 mm. [5]

Haiyan Bolt lists metric sizes M8 to M24 in carbon, alloy and stainless steels (201, 304, 316), brass and aluminium alloy, with finishes including plain, black oxide, zinc, hot-dip galvanised, nickel, chrome, Dacromet and Geomet. [3]

Editorial calculation: 5/8 in ≈ 15.9 mm, so AFT's largest inch size sits just below its largest metric size, M18. [2]

Editorial calculation: at M8 the DIN 315 round-wing nut can be up to 1 mm wider across the wings (39 mm against 38 mm maximum) and 1 mm taller (20 mm against 19 mm maximum) than the DIN 314 edged-wing nut, so check hand clearance against the drawing of the form actually supplied. [4] [5]

03

Compare what suppliers offer

The suppliers linked to this page list wing nuts; their cards link to the pages reviewed.

Ask any supplier for the standard and type, thread and size, wing span and height drawing, material and its certificate, finish and coating thickness, any proof-load or torque test, and packaging.

Because both DIN standards give tolerance bands rather than single values, ask for measured wing span, height and body height on a first-article sample against the band for your size.

04

Trace what defines the nut

This is a functional reference built from the sources cited; it is not one maker's specification.

05

Fill the specification fields with values for your order

A wing nut quotation needs values for your application. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.

06

Send the standard, type and size data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Standard: [ASME B18.6.9; DIN 315]
Type: [cold-forged; hot-forged; die-cast; stamped]
Thread: [inch or metric size]
Material: [steel; stainless; brass; nylon]
Finish: [plain; zinc; HDG]
Quantity and packing: [pieces]

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