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Our Services
1. We are specialized in manufacturing fastener
2. Rich manufacture experience.
3. High quality with competitive price.
4. Domestic and Overseas markets.
5. Well equipped with complete facilities.
6. Strict quality control
7. In addition to supplying varieties of types and specifications to our customers, we also accept customized product.
Product Discreption
| Product Name | Butterfly Wing Nut |
| Material | Stainless Steel: SS201, SS303, SS304, SS316, SS410, SS420 Carbon Steel: 4.8, 6.8, 8.8, 10.9, 12.9 |
| Size | M3-M20 or as per your request |
| Standard | ISO,GB, DIN, JIS, ANSI, BSW,ASME |
| Certificate | ISO9001:2008, SGS testing report & RoHS |
| Finishing | Zn- Plated, Ni-plated, Tin-Plated, Radiant Plated, Passivated, Brass plated, Cd- plated, Phosphate Anodize, Cr-plated, Black Oxide etc |
| Heat Treatment | Tempering,Hardening,Spheroidizing,Stress Relieving etc |
| Package | General export package, or according to customer's requirement |
| Delivery time | About 7 -15 days after all details confirmed and able to offering fast delivery for urgent order |
| Customer Service | Replacement at all our cost for rejected products if the part does not match with the PO drawings |


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Products name
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BOLTS, NUTS, WASHERS, SCREWS, THREADED ROD, ANCHOR BOLTS, STAMPING PART,SOLAR ENERGY ACCESSORIES
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Standard
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DIN,ASTM/ANSI JIS EN ISO,AS,GB
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Material
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Stainless Steel: SS201, SS303, SS304, SS316,SS316L,SS904L ,SS31803
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Steel Grade: DIN: Gr.4.6,4.8,5.6,5.8,8.8,10.9,12.9; SAE: Gr.2,5,8; ASTM: 307A,307B,A325,A394,A490,A449,
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Finishing
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Zinc(Yellow,White,Blue,Black),Hot Dip Galvanized(HDG),Black, Geomet,Dacroment,anodization,Nickel plated,Zinc-Nickel plated |
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Production
Process
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M2-M24:Cold Froging,M24-M100 Hot Forging, Machining and CNC for Customized fastener |
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Customized Products
Lead time
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Busy season:15-30days,Slack seaon:10-20days
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Stock Products
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Stainless steel: All DIN Standard stainless steel fastener(BOLTS,NUTS.SCREWS.WASHERS)
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1. What is a stainless steel wing nut?
A stainless steel wing nut is a type of fastener with two protruding "wings" that allow for hand-tightening and loosening without tools. It is made from stainless steel, providing excellent corrosion resistance and durability.
2. What are the advantages of stainless steel wing nuts?
Corrosion Resistance: Ideal for outdoor, marine, and high-moisture environments.
Strength & Durability: Good mechanical strength and long service life.
Tool-Free Operation: Easy to install and remove by hand for quick adjustments.
Hygienic & Aesthetic: Easy to clean, with a clean, modern appearance suitable for food service, medical, and architectural applications.
3. What are the common grades of stainless steel used?
AISI 304 (A2): The most common grade, offering good corrosion resistance for general purposes.
AISI 316 (A4): Superior corrosion resistance, especially against chlorides and acids. Recommended for marine and chemical environments.
Other Grades: 303 (for improved machinability) and 410 (martensitic, heat-treatable for higher strength).
4. What thread types are available?
Standard thread types include:
Coarse Thread (UNC): Common, faster assembly.
Fine Thread (UNF): For applications requiring finer adjustment.
Metric Threads: Standard in many countries.
Always specify the thread size (e.g., #8-32, 1/4"-20, M6, M8) when ordering.
5. What finishes are available?
Common finishes include:
Plain / Mill Finish: Natural stainless steel appearance.
Passivated: Chemical treatment to enhance corrosion resistance by removing free iron and forming a protective oxide layer.
Electropolished: Smooth, mirror-like finish that further improves corrosion resistance and cleanability.
6. Are stainless steel wing nuts magnetic?
Austenitic grades like 304 and 316 are generally non-magnetic in the annealed state but may become slightly magnetic after cold working (e.g., during forging or threading).
Martensitic grades (like 410) are magnetic.
7. Can I use stainless steel wing nuts with other metal fasteners?
Use caution to avoid galvanic corrosion. Stainless steel is cathodic relative to many metals (like aluminum, zinc, or carbon steel). Direct contact in a corrosive environment can accelerate corrosion of the less noble metal. Use insulating washers or choose compatible materials.
8. What are typical applications?
Marine equipment (boats, docks)
Food processing and beverage machinery
Architectural fixtures and furniture
HVAC systems
Agricultural equipment
Stage and lighting rigging
Recreational vehicles and camping gear
Any application requiring frequent, tool-free adjustment in corrosive environments.
9. How do I choose the right size?
Determine:
Thread Diameter and Pitch (e.g., 1/4"-20 or M6 x 1.0)
Wing Span: For grip and torque application.
Height/Profile: Low-profile or standard.
Grade: 304 for general use, 316 for harsh environments.
Standards: Compliance with relevant standards (e.g., ASME B18.6.9, DIN 315).
10. What is the maximum torque I can apply by hand?
Torque varies by size and user strength. Generally, hand-tightening provides sufficient clamping for light to medium-duty applications. For critical high-vibration applications, consider a final check with a torque wrench or using a locking variant (e.g., with a nylon insert).
11. Are there locking or self-locking wing nut versions?
Yes. Options include:
Nylon Insert Locking Wing Nuts: A nylon ring prevents loosening from vibration.
Serrated Bearing Surface: Provides a grip on the mating surface.
Prevailing Torque Types: Deformed threads create friction.
12. How do I clean and maintain stainless steel wing nuts?
Regular wiping with mild soap and water is usually sufficient.
For stubborn stains or salt deposits, use a stainless steel cleaner or a diluted vinegar solution.
Avoid abrasive pads or steel brushes that can damage the passive layer. Use non-metallic scouring pads if needed.
13. Can they be used in high-temperature applications?
Stainless steel has good high-temperature properties. However, the continuous service temperature limit for standard 304/316 is typically around 800°F - 870°F (427°C - 466°C). For higher temperatures, verify the grade's specific properties and consider potential thread galling.
14. What is thread galling, and how can I prevent it?
Galling is a form of wear where threads seize and tear due to friction and adhesion between stainless steel surfaces.
Prevention Tips:
Use a different grade for the bolt and nut (e.g., 316 nut on a 304 bolt).
Apply a lubricant or anti-seize compound (e.g., nickel-based) on threads before assembly.
Start threads carefully and tighten slowly.
Avoid over-torquing.
15. Where can I purchase stainless steel wing nuts?
They are available from:
Industrial distributors (e.g., Fastenal, Grainger, McMaster-Carr)
Specialty fastener suppliers
Online marketplaces
Directly from manufacturers
