Product Summary

Longze Flügelmuttern (also known as Butterfly Nuts) are manufactured according to DIN 315 Und ASME B18.6.9 standards, widely used in lighting equipment, consumer electronics, drum kits, and temporary

structures. Featuring two ergonomic "wings", these Longze Flügelmuttern are designed for applications requiring frequent, manual adjustments without the need for wrenches or specialized tools, providing a convenient

and reliable hand-tightened connection.

• ✔ Tool-Free Operation: The large wing surface area allows for high leverage using only fingers, making them ideal for quick-release and rapid assembly.

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• ✔ Precision Threading: Engineered with smooth internal Metric or Imperial threads to prevent galling, especially in Edelstahl variations.

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• ✔ Robust Construction: Available in Forged (heavy duty) or Stamped (light duty) designs to match specific load and aesthetic requirements.

Key Features of Flügelmuttern

• Ergonomic Design – The "butterfly" shape provides a comfortable grip for maximum manual torque application.

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• Rapid Adjustment – Perfect for applications that need to be disassembled or adjusted daily, such as camera rigs or music stands.

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• Korrosionsbeständigkeit – Offered in Zinc Plated for indoor use and Marine Grade SS316 for high-moisture or saltwater environments.

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• Versatile Material Range – From lightweight Aluminium and decorative Brass to high-strength Ductile Iron.

Technical Specifications

• Standards: DIN 315 / ISO 315 / ASME B18.6.9 (Type A, B, C, D) / BS 856

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• Metric Size Range: M3 to M24

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• Inch Size Range: #4 to 1" (UNC / UNF)

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• Manufacturing Process: Cold Forged, Hot Forged, Die Cast, Stamped

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• Finish: Zinc Plated / Hot-Dip Galvanized / Black Oxide / Electropolished

• Material & Mechanical Properties

• Material	Grad	Tensile Strength	Feature	Anwendung
  Carbon Steel	Class 5 / 8	500 to 800 MPa	High Strength	Scaffolding / Heavy Gear
  Edelstahl	SS304 (A2)	$\ge 700$ MPa	Rust Proof	Food / Medical / Outdoor
  Edelstahl	SS316 (A4)	$\ge 800$ MPa	Acid Resistant	Marine / Chemical
  Brass	H62	Medium	Non-Magnetic	Electronics / Decorative

• Dimensions & Global Size Conversion
• Technical Standard: Longze provides professional-grade wing nuts (Butterfly Nuts) manufactured to DIN 315 (Metric) and ASME B18.6.9 (Imperial) standards. These fasteners feature two "wings" designed for manual tightening and loosening without the need for tools, making them ideal for frequently adjusted assemblies.

• American Size (# Gauge/Inch)	Nearest Metric Size (M)	Wing Span (e) (mm/inch)	Total Height (h) (mm/inch)	Base Diameter (d2) (mm/inch)
  #6 - 32	M3.5	18.0 mm / 0.72"	8.5 mm / 0.33"	6.0 mm / 0.24"
  #8 - 32	M4	20.0 mm / 0.78"	10.5 mm / 0.41"	8.0 mm / 0.31"
  #10 - 24	M5	26.0 mm / 1.02"	13.0 mm / 0.51"	10.0 mm / 0.39"
  1/4" - 20	M6	33.0 mm / 1.30"	17.0 mm / 0.67"	13.0 mm / 0.51"
  5/16" - 18	M8	39.0 mm / 1.53"	20.0 mm / 0.78"	16.0 mm / 0.63"
  3/8" - 16	M10	51.0 mm / 2.01"	25.0 mm / 0.98"	20.0 mm / 0.78"
  1/2" - 13	M12	65.0 mm / 2.55"	33.5 mm / 1.31"	23.0 mm / 0.90"
  5/8" - 11	M16	73.0 mm / 2.87"	37.5 mm / 1.47"	29.0 mm / 1.14"
  3/4" - 10	M20	90.0 mm / 3.54"	46.5 mm / 1.83"	35.0 mm / 1.38"

• Surface Treatment

• Coating	Process	Salt Spray	Anwendung
  Zinc Plated	Electroplating	72 to 144h	Indoor Furniture / DIY
  Black Zinc	Electroplating	48 to 96h	Stage Lighting / Optics
  Electropolished	Chemical	1000+h	Food Grade / Marine
  HDG	Molten Zinc	500+h	Outdoor Signage