What is hex cap nuts ?
Cap nuts are a type of hexagonal nut with a closed dome shape, also known as hex dome nuts or acorn cap nuts. It can protect bolt threads from corrosion and also serve as a decorative and anti-collision function, making it a popular fastener.
As an industry-leading professional supplier of acorn cap nuts, T&Y Hardware is committed to providing customers with one-stop service from standard products to customized solutions. We have a complete product series of cap nuts, covering M3 to M24 metric standards, and at the same time Support customization of non-standard sizes such as American and Imperial systems to meet the diverse needs of different industries and application scenarios.
Hex Acorn Cap Nuts Types By Feature
Our company supplies various types of cap nuts (Acorn Nut), including standard type, high top type, low top type, nylon insert type, and flange type, which can meet the needs of different application scenarios.

A dwarf-type hex cap nut or flat acorn cap nut, has a flat head that does not protrude.
Standard: DIN917
Size: M3~M20, 6-32~5/8-11
Height:4.5mm~24.5mm

Its head is slightly smaller than a regular cap nut, and nylon material is inserted into the thread to achieve an anti-loosening effect, also known as a self-locking cap nut. The top can be made of metal, nylon or other materials.
Standard: DIN 986

This is the most commonly used cap nut, with a round top
Standard: DIN1587
Size: M3~M24, 6-32~5/8-11
Height:6mm~42mm

The cap nut adds a ring of flange design and can be installed directly without additional gaskets, which not only simplifies the assembly process but also ensures connection stability. We provide a long type for wheel assembly.
Size: M4~M12, 6-32~5/8-11
Acorn Cap Nuts By Material
T&Y Hardware uses professional craftsmanship to create high-quality cover nuts. It selects a variety of high-quality materials such as 304/316 stainless steel, high-strength carbon steel, corrosion-resistant brass, aerospace-grade titanium alloy, and lightweight aluminum alloy. With zinc plating, nickel plating, Dacromet, and other surface treatment processes, it not only ensures excellent anti-rust performance and structural strength but also gives the products an exquisite appearance.
We provide you with all-around fastening solutions at competitive prices to meet the stringent needs of different fields.
Our Company Advantage
T&Y Industrial specializes in producing cap nuts. We strictly adhere to international standards and use high-quality materials such as 304 316 stainless steel and carbon steel, which have the advantages of high strength, corrosion resistance, clear threads, and are not easily damaged.
We not only produce standard products, but also support customized non-standard fasteners, OEM, ODM services.
Various parameters of our Acorn cap nuts
- Our certificate
- Materials
- Strength grade
- Surface Treatment

17H Steel, 22H Steel, Brass, Aluminum, titanium alloy
Stainless Steel: SS202、SS304、SS316、SS410、SS420、SS430
Alloy steel: Inconel 600、 Inconel 625 、Inconel 718 、 Monel 400、 K500
Class 6/8/10
ASTM 2H/2HM
Astm grade a 563 A/ B /C
Plain, Galvanized, HDG, Nickel Plated, Copper plating, black oxidation, passivation, polishing,power coated and so on
Related Product
We usually keep stock for standard hex cap nuts. If not special items, no MOQ required
Every process will be checked by our quality inspection department which ensures every product’s quality. In the production of products, we will personally go to the factory to check the quality of the products.
Our main customers are from Europe,S outh and North America, Southeast Asia
Sure, our sample is provided free of charge, but not include courier fees.
30% value of T/T in advance and other 70% balance on B/L copy.
For small order less than 1000USD, would suggest you pay 100% in advance to reduce the bank charges.
For Standard carbon steel hex dome nuts ,we will ship in one month ,For stainless steel acorn cap nuts ,we will ship in 7-10 days, Special items per required
















