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304 American Standard Butterfly Nut
A 304 American Standard Butterfly Nut, also known as a wing nut, is crafted from 304-grade stainless steel, known for its excellent resistance to corrosion and oxidation. This type of nut is distinguished by its two large, wing-like projections that allow it to be tightened and loosened by hand without the need for tools. This feature makes butterfly nuts particularly useful in applications where fast, frequent adjustments or disassembly is required.

304 American Standard Butterfly Nut Load Capacity and Strength

Material Strength

304 Stainless Steel: Known for its good mechanical properties and corrosion resistance, 304 stainless steel has a tensile strength of approximately 70,000 psi (480 MPa). This makes it suitable for various applications where moderate strength and resistance to environmental factors are required.

Design and Dimensions

Dimensions: The load capacity of a butterfly nut is directly related to its size and thread dimensions. For American Standard threads, common sizes include 1/4"-20, 5/16"-18, and 3/8"-16, among others. Larger dimensions generally provide higher load capacities.

Design Features: The design of a butterfly nut, which includes wings for manual tightening, impacts its ability to handle loads. The load capacity is also affected by the thickness and overall design of the nut.

Load Capacity

General Capacity: While exact load capacities can vary based on specific dimensions and design, a general rule of thumb for standard 304 stainless steel nuts (not specifically butterfly nuts) is that they can handle a load proportional to their size and thread type. For instance, a 1/4"-20 304 stainless steel nut might handle around 500 to 800 pounds of axial load, but this can vary.

Butterfly Nut Specifics: Butterfly nuts are generally used for applications requiring frequent adjustments or where manual tightening is needed. They are not typically designed for heavy-load applications compared to other types of nuts and fasteners.

Factors Affecting Strength

Installation Conditions: Proper installation and torque application are crucial. Over-tightening can lead to damage, while under-tightening may result in a loose connection.

Environmental Conditions: Although 304 stainless steel is corrosion-resistant, extreme environments or conditions could affect its performance. For critical applications, consider using nuts specifically designed for high-strength or high-corrosion environments.

For precise load capacity and strength values, consulting manufacturer specifications or engineering guidelines specific to the butterfly nut's size and design is essential.

Specifications of 304 American Standard Butterfly Nut
M4 M5 M6 M8 M10 M12 M16 M20 M24
0.7 0.8 1 1.25 1.5 1.75 2 2.5 3
8 11 13 16 20 23 29 35 44
6 8 10 13 17 20 26 32 41
7 9 11 12.5 16.5 19.5 23 29 37.5
5.5 7.5 9 10.5 14.5 17.5 21 27 35
20 26 33 39 51 65 73 90 110
18 24 30 36 48 62 70 86 106
1.9 2.3 2.3 2.8 4.4 4.9 6.4 6.9 9.4
1.1 1.5 1.5 2 3.6 4.1 5.6 6.1 8.6
2.3 2.8 3.3 4.4 5.4 6.4 7.5 8 10.5
1.7 2.3 2.7 3.6 4.6 5.6 6.5 7 9.5
10.5 13 17 20 25 33.5 37.5 46.5 56.5
8.5 11 15 18 23 31 35 44 53.5
4.6 6.5 8 10 12 14 17 21 25
3.2 4 5 6.5 8 10 13 16 20
2 2.5 3 3 5 6 7 8 9
3 4 5 6 8 10 11 14 18

①, Material: a) Forgeable cast iron

GT: GTS or GTW is determined by the manufacturer;

b) Steel St: Forging or cold working is determined by the manufacturer;

c) Copper-zinc alloy CuZn: Forgeable alloy or cast alloy is determined by the manufacturer;

d) Austenitic stainless steel A: Grade is determined by the manufacturer