Acorn Nuts

Manufacturer, Exporter & Supplier of Acorn Nuts

Acorn Nuts

Here at GIC Fasteners, we specialize in producing premium acorn nuts, sometimes referred to as cap nuts, that are made to adhere to a number of international standards, such as DIN, ASTM, ISO, and BS. Our acorn nuts are expertly made to guarantee that they reliably shield exposed bolt ends while also improving their appearance. Our goods come in brass, zinc-plated, and stainless steel varieties and are appropriate for industrial, furniture, and automotive applications. For all of your fastening needs, put your trust in GIC Fasteners and enjoy unmatched safety and durability.

Acorn nuts, sometimes referred to as cap nuts, are necessary fasteners that shield exposed bolt ends and improve their appearance. These nuts with a dommed top enhance safety, reduce risk of harm, and give a polished appearance to a variety of uses. We at GIC Fasteners provide a large selection of premium acorn nuts that are appropriate for industrial, furniture, and automotive applications. Our precisely crafted acorn nuts fulfill the strictest industry requirements for dependability and longevity. Whatever your fastening requirements, GIC Fasteners provides the ideal option, whether it’s brass, zinc-plated, or stainless steel.

Choosing GIC Fasteners for your acorn nut requirements guarantees not only top-notch products but also exceptional customer service. Our team of experts is dedicated to helping you find the right fasteners for your specific applications, ensuring optimal functionality and longevity. With competitive pricing and fast shipping, we make it easy to get the acorn nuts you need when you need them. Don’t compromise on quality or safety—contact us today at to discuss your requirements and receive a personalized quote. Let GIC Fasteners be your trusted partner in all your fastening solutions.

Acorn Nuts Specifications​

Standard : DIN, ASTM, BS, ISO, JIS, IS, GB, IS 4190 and all other International Standards
Length : 3 mm to 200 mm
Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Threads: : BSF, UNF METRIC, UNC, BSW or as required
Finish : Plain, black, zinc plated (Cr,3+), zinc plated(Cr,6+), hot dipped galvanized, dacromet, nickel plated, cadmium plated, etc.
Forming : Hot & Cold Forged
Variants : Fully Threaded Square Acorn Nuts, Partial Threaded Square Acorn Nuts, Metric Square Acorn Nuts, Imperial Square Acorn Nuts
Coatings : PTFE (Teflon), Hot Dip Galvanizing, Aluminum Zinc Flake, Zinc Phosphating, Manganese Phosphating, Metallic Zinc, Nickel Bolts Plating, Chrome Plating, Cadmium Plating, Silver Plating, Tin Plating

Dimension Chart For One Piece Cap (Acorn) Closed-End Hex Cap Nuts

Nominal Size or Basic
Major Diameter of

Width Across Flats

Width Across Corners

Body Diameter



Drill Depth
Max Min Max Min Max Min
6 0.1380 0.3125 0.302  0.361  0.344 0.30 0.34  0.16 0.25 0.16
8 0.1640 0.3125 0.302   0.361   0.344 0.30 0.34  0.16 0.25 0.16
10 0.1900 0.3750 0.362  0.433  0.413 0.36 0.41  0.19 0.28 0.19
1/4 0.2500 0.4375 0.428   0.505   0.488 0.41 0.47  0.22 0.34 0.25
5/16 0.3125 0.5000 0.489  0.577  0.557 0.47 0.53  0.25 0.41 0.31
3/8 0.3750 0.5625 0.551  0.650 0.628  0.53 0.62  0.28 0.45 0.38
1/2 0.5000 0.7500 0.736  0.866 0.840 0.72 0.81  0.38 0.59 0.50
5/8 0.6250 0.9375 0.922 1.083 1.051 0.91 1.00  0.47 0.75 0.62
3/4 0.7500 1.0625 1.045 1.227 1.191 1.03 1.16  0.53 0.88 0.75

Two Piece Closed-End Hex Cap Nuts Dimension Chart

Nominal Size or Basic
Major Diameter of


Width Across Flats

Width Across Corners

Overall Height
Max Min Max Min Max Min
4 0.1120 0.248 0.225  -  - 0.200 0.177
5 0.1250 0.3125 0.302   0.361   0.344 0.260 0.240
6 0.1380 0.3125 0.302  0.361  0.344 0.260 0.240
8 0.1640 0.3125 0.302   0.361   0.344 0.260 0.240
10 0.1900 0.3750 0.362  0.433  0.413 0.291 0.271
1/4 0.2500 0.4375 0.423  0.505 0.482  0.338 0.318
5/16 0.3125 0.562 0.545  0.650 0.621 0.385 0.365
3/8 0.3750 0.625 0.607 0.722 0.692 0.432 0.412
7/16 0.4375 0.673 0.659 0.775 0.750 0.680 0.660
1/2 0.5000 0.750 0.736 0.866 0.840 0.572 0.552
9/16 0.5625 0.875 0.861 1.010 0.982 0.482 0.462
5/8 0.6250 0.938 0.909 1.083 1.037 0.807 0.787
3/4 0.7500 1.12 1.08 - - 1.12 1.08
7/8 0.8750 1.250 1.212 1.443 1.382 1.420 1.380
1 1.0000 1.497 1.447 1.728 1.650 1.572 1.414

Stainless Steel Acorn Nuts - Grades

  • Stainless Steel 304 Acorn Nuts
  • Stainless Steel 304L Acorn Nuts
  • Stainless Steel 304H Acorn Nuts
  • Stainless Steel 310 Acorn Nuts
  • Stainless Steel 310S Acorn Nuts
  • Stainless Steel 310H Acorn Nuts
  • Stainless Steel 316 Acorn Nuts
  • Stainless Steel 316L Acorn Nuts
  • Stainless Steel 316Ti Acorn Nuts
  • Stainless Steel 317 Acorn Nuts
  • Stainless Steel 317L Acorn Nuts
  • Stainless Steel 321 Acorn Nuts
  • Stainless Steel 321H Acorn Nuts
  • Stainless Steel 347 Acorn Nuts
  • Stainless Steel 347H Acorn Nuts
  • Stainless Steel 904L Acorn Nuts
  • Stainless Steel 410 Acorn Nuts
  • Stainless Steel 446 Acorn Nuts
  • SMO 254 Acorn Nuts
  • 17-4 PH Stainless Steel Acorn Nuts

Duplex Steel Acorn Nuts- Grades

  • UNS S32205 Acorn Nuts
  • UNS S31803 Acorn Nuts

Super Duplex Steel Acorn Nuts - Grades

  • UNS S32750 Acorn Nuts
  • UNS S32760 Acorn Nuts

Inconel/Incoloy Acorn Nuts - Grades

  • Inconel 600 Acorn Nuts
  • Inconel 601 Acorn Nuts
  • Inconel 625 Acorn Nuts
  • Inconel 718 Acorn Nuts
  • Incoloy 800 Acorn Nuts
  • Incoloy 825 Acorn Nuts

Monel Acorn Nuts - Grades

  • Monel 400 Acorn Nuts
  • Monel K500 Acorn Nuts

Nickel Acorn Nuts - Grades

  • Nickel 200 Acorn Nuts
  • Nickel 201 Acorn Nuts

Hastelloy Acorn Nuts - Grades

  • Hastelloy C276 Acorn Nuts
  • Hastelloy C22 Acorn Nuts
  • Hastelloy B2 Acorn Nuts
  • Hastelloy B3 Acorn Nuts
  • Hastelloy X Acorn Nuts

Titanium Acorn Nuts - Grades

  • Titanium Grade 2 Acorn Nuts
  • Titanium Grade 5 Acorn Nuts

Tantalum Acorn Nuts- Grades

  • UNS R05200 Acorn Nuts
  • UNS R05252 Acorn Nuts
  • UNS R05255 Acorn Nuts
  • UNS R05400 Acorn Nuts

Cupro Nickel Acorn Nuts - Grades

  • CuNi 90/10 Acorn Nuts
  • CuNi 70/30 Acorn Nuts

Copper Acorn Nuts - Grades

  • UNS C11000 Acorn Nuts
  • UNS C10100 Acorn Nuts
  • UNS C10200 Acorn Nuts
  • UNS C12000 Acorn Nuts
  • UNS C12200 Acorn Nuts

Carbon Steel Acorn Nuts - Grades

  • Carbon Steel AISI 1018 Acorn Nuts
  • Carbon Steel AISI 1020 Acorn Nuts
  • Carbon Steel AISI 1040 Acorn Nuts
  • Carbon Steel AISI 1045 Acorn Nuts

Alloy Steel Acorn Nuts - Grades

  • Alloy Steel 4130 Acorn Nuts
  • Alloy Steel 4140 Acorn Nuts
  • Alloy Steel 4340 Acorn Nuts
  • Alloy Steel 8620 Acorn Nuts
  • ASTM A193 Alloy Steel Gr B7 Acorn Nuts
  • ASTM A193 Alloy Steel Gr B7M Acorn Nuts
  • ASTM A320 Alloy Steel Gr L7 Acorn Nuts
  • ASTM A320 Alloy Steel Gr L7M Acorn Nuts
  • ASTM A320 Alloy Steel Gr L43 Acorn Nuts
  • ASTM A320 Alloy Steel Gr L43 Acorn Nuts
  • ISO 898-1 Alloy Steel Gr 8.8 Acorn Nuts
  • ISO 898-1 Alloy Steel Gr 10.9 Acorn Nuts
  • ISO 898-1 Alloy Steel Gr 12.9 Acorn Nuts

Brass Acorn Nuts - Grades

  • UNS C21000 Acorn Nuts
  • UNS C22000 Acorn Nuts
  • UNS C22600 Acorn Nuts
  • UNS C23000 Acorn Nuts
  • UNS C24000 Acorn Nuts
  • UNS C26000 Acorn Nuts
  • UNS C26800 Acorn Nuts
  • UNS C27000 Acorn Nuts
  • UNS C27200 Acorn Nuts
  • UNS C28000 Acorn Nuts
  • UNS C33000 Acorn Nuts
  • UNS C33500 Acorn Nuts
  • UNS C34000 Acorn Nuts
  • UNS C34200 Acorn Nuts
  • UNS C35300 Acorn Nuts
  • UNS C35600 Acorn Nuts

Aluminium Acorn Nuts - Grades

  • Aluminium Alloy 1050 Acorn Nuts
  • Aluminium Alloy 1060 Acorn Nuts
  • Aluminium Alloy 1060 Acorn Nuts
  • Aluminium Alloy 1070 Acorn Nuts
  • Aluminium Alloy 1080 Acorn Nuts
  • Aluminium Alloy 1100 Acorn Nuts
  • Aluminium Alloy 1145 Acorn Nuts
  • Aluminium Alloy 2011 Acorn Nuts
  • Aluminium Alloy 2014 Acorn Nuts
  • Aluminium Alloy 2017 Acorn Nuts
  • Aluminium Alloy 2024 Acorn Nuts
  • Aluminium Alloy 2090 Acorn Nuts
  • Aluminium Alloy 3003 Acorn Nuts
  • Aluminium Alloy 5052 Acorn Nuts
  • Aluminium Alloy 5083 Acorn Nuts
  • Aluminium Alloy 6061 Acorn Nuts
  • Aluminium Alloy 6063 Acorn Nuts
  • Aluminium Alloy 6066 Acorn Nuts
  • Aluminium Alloy 6082 Acorn Nuts
  • Aluminium Alloy 7050 Acorn Nuts
  • Aluminium Alloy 7075 Acorn Nuts

Zirconium Acorn Nuts - Grades

  • UNS R60700 Acorn Nuts
  • UNS R60702 Acorn Nuts
  • UNS R60704 Acorn Nuts
  • UNS R60705 Acorn Nuts
  • UNS R60706 Acorn Nuts

Beryllium Copper Acorn Nuts - Grades

  • UNS C17200 Acorn Nuts
  • UNS C17300 Acorn Nuts
  • UNS C17500 Acorn Nuts
  • UNS C17510 Acorn Nuts

Phosphor Bronze Acorn Nuts - Grades

  • UNS C51000 Acorn Nuts
  • UNS C51900 Acorn Nuts
  • UNS C52100 Acorn Nuts
  • UNS C54400 Acorn Nuts

Silicon Bronze Acorn Nuts - Grades

  • UNS C65100 Acorn Nuts
  • UNS C65500 Acorn Nuts
  • UNS C66100 Acorn Nuts

Characteristics of Acorn Nuts

  • Design: Acorn nuts, also known as cap nuts or crown hex nuts, feature a domed top, resembling an acorn.
  • Material: Typically made from high-quality materials such as stainless steel, brass, or steel, ensuring durability and corrosion resistance.
  • Function: Acorn nuts are used to cover and protect exposed threads, enhancing safety and aesthetics in various applications.
  • Thread Type: Available in different thread types, including standard, fine, and coarse threads, catering to diverse fastening requirements.
  • Usage: Widely used in automotive, construction, and industrial applications for securing bolts and screws in a wide range of assemblies.
  • Finishes: Acorn nuts come in various finishes, such as plain, zinc-plated, or coated, providing options for different environmental conditions.
  • Size Range: Available in a variety of sizes, from small to large, to accommodate different bolt diameters and thread counts.
  • Easy Installation: Designed for easy installation and removal, making them user-friendly for both professionals and DIY enthusiasts.

Applications of Acorn Nuts

Industry Application
Automotive Used in engine components and body assemblies to secure bolts and screws.
Construction Utilized in structural applications for fastening steel beams, columns, and other components.
Electrical Securing electrical panels, junction boxes, and fixtures to surfaces.
Marine Resistant to corrosion, making them ideal for marine environments, used in boat building and repairs.
Industrial Machinery Found in heavy machinery, conveyors, and manufacturing equipment for reliable fastening.
Furniture Used in furniture assembly, ensuring sturdy and long-lasting joints in various wooden structures.
Aerospace Critical in aerospace applications, providing secure fastening solutions for aircraft components.
Renewable Energy Utilized in wind turbines and solar panel installations for reliable and durable fastening.

Wide Range of Quality Products

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Competitive Pricing and Cost Savings

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Exceptional Customer Service

Personalized assistance, prompt responses, and a commitment to meeting your needs, making your purchase process seamless.

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Acorn Nuts - FAQs

Acorn Nuts come in weather-resistant materials and finishes, making them ideal for outdoor use in various industries.

Acorn Nuts find applications in automotive, construction, marine, aerospace, and renewable energy sectors, ensuring secure fastening in critical components.

Yes, Acorn Nuts are designed to resist corrosion, making them reliable choices for marine applications where exposure to saltwater is common.

Indeed, Acorn Nuts are manufactured in various sizes, accommodating different bolt diameters and thread counts, providing versatility for diverse projects.

Absolutely, Acorn Nuts are commonly used in furniture manufacturing, providing sturdy and long-lasting joints in wooden structures.

No, Acorn Nuts are easy to install and remove, requiring standard tools for fastening, making them user-friendly for professionals and DIY enthusiasts.

Acorn Nuts, when made from high-quality materials, have a long lifespan, ensuring durable fastening solutions in industrial machinery and equipment.

Yes, Acorn Nuts made from heat-resistant materials are suitable for high-temperature environments, ensuring reliable performance in extreme conditions.

Certainly, many manufacturers offer custom finishes for Acorn Nuts, allowing you to match specific aesthetic or functional needs for your projects.

Acorn Nuts - Export Destination

Acorn Nuts Supplier in North America
Antigua and Barbuda, Bahamas, Barbados, Belize, Canada, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guatemala, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, United States.
Acorn Nuts Supplier in South America
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.
Acorn Nuts Supplier in Europe
Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic (Czechia), Denmark, Estonia, Finland, France, Germany, Greece, Holy See, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russia, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom.
Acorn Nuts Supplier in Asia
Afghanistan, Armenia, Azerbaijan, Bahrain, Bangladesh, Bhutan, Brunei, Cambodia, Cyprus, Georgia, India, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Laos, Lebanon, Malaysia, Maldives, Mongolia, Myanmar, Nepal, Oman, Pakistan, Palestine, Philippines, Qatar, Saudi Arabia, Singapore, South Korea, Sri Lanka, State of Palestine, Syria, Taiwan, Tajikistan, Thailand, Timor-Leste, Turkey, Turkmenistan, United Arab Emirates, Uzbekistan, Vietnam, Yemen.
Acorn Nuts Supplier in Australia
Australia, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Zealand, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu, Vanuatu.