M4 Stainless Steel 304 Hexagonal Hex Domed Cap Nut Hexagon Dome Head Lock Nut Cap Acorn Nut

Product Description

What are cap nuts?
A cap nut (Acorn Nuts or Dome Nuts) is a hex nut whose top is designed as a closed end, which can not only tighten the connection, but also serve as a protective cover for bolts. This structure can effectively prevent moisture and corrosion, and extend the fasteners' service life, and with its smooth dome design, it is both beautiful and suitable for application scenarios that require both functionality and decoration.

Product Name	M4 Stainless Steel 304 Hexagonal Hex Domed Cap Nut Hexagon Dome Head Lock Nut Cap Acorn Nut
Standard:	DIN1587 DIN917 DIN986 GB802.1 GB923
Thread:	Metric thread, Inch thread
Material:	Carbon steel: Q235, A36, A572, C1006, C1008, C1010, C1018, C1018A, C1022, C1035K, C1045K, 12L14.etc Stainless steel: 253MA,SS201,202,301,302,303,304,304L,309,310S,314,316,316L,316Ti,317L,321,347,410,416,420,430,435,904 Aluminium: AL6061, AL6063, 7075 etc. Titanium or titanium alloy: TAD, TA1-TA8, TB2, TC1-TC10 etc. Brass: C36000, C37700, C38500, C26800, C21000, C3602, C3604, H59, H62, H65, H68, H70, H90, etc. Alloy steel: SCM435,10B21,40Cr, C10B33 Precipitation hardening steel: 17-7PH Urea steel: 724L, 725LN Superalloy: GH4169, GH4145, GH2132 Nickel Alloy: Nickel 200, Nickel 201 Non-metallic: Zirconia Ceramic, PFA, Polypropylene, PVDF, polyphenylene sulfide, Polycarbonate, PEI, PTFE, PEEK, PVC, fiberglass, PA66 nylon, POM, Polyethylene. Duplex Stainless Steel: S32750, S32760, S2205, S2507,F51, F53, F55, F60, F61, 2205 Steel: C15, C35, C45(K1045), S45C, C46(K1046), C20, etc Iron: 12L13,12L14,12L15 etc. Corrosion-resistant alloy: XM-19, C4, Alloy20, Alloy28, Alloy31, 904L, 318 Copper: Brass, Phosphor bronze, Silicon bronze, Red copper, Beryllium copper and Copper etc. Bronze: C51000, C52100, C54400, etc.
Size	M3-M24 or as request
Finish:	Zinc Plated, HDG ,Black ,Bright,GOEMET
Packing:	bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand
Leading Time :	20-30 days or based on order required

Hex Dome Cap Nuts By Material

T&Y Hardware provides a variety of material choices for different application needs. The cover nut made of has both anti-rust and aesthetic characteristics, and is suitable for long-term durability needs.

ensures high strength while taking into account cost performance, and is suitable for industrial standard applications.

is especially suitable for wet or corrosive environments due to its excellent oxidation resistance.

are widely used in weight-sensitive scenarios due to their lightweight characteristics.
In addition, we also provide cover nuts made of , which have the advantages of high strength, corrosion resistance, and lightweight, and are ideal for aerospace and other fields.
Hex Acorn Cap Nuts By Features
We offer you a full range of dome cap nut solutions. Our product line includes:
* : It adopts a thickened top design to provide stronger sealing and aesthetics, and is suitable for application scenarios with higher appearance and protection requirements;
* : lower height, suitable for space-constrained installation environments, maintaining stable locking while saving space;
* : built-in anti-loosening nylon ring, effectively preventing loosening caused by vibration and impact, suitable for high dynamic load equipment;
* : With an integrated flange base, it increases the contact surface, disperses pressure, and reduces damage to the connection surface. It is suitable for occasions requiring high stability.

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Company Profile

Established in 2002, Shanghai T&Y Hardware Industry Co., Ltd. is a professional manufacturer specializing in high-quality fasteners, including screws, bolts, nuts, washers, and stamping parts.
* Certified & Compliant: Fully compliant with ISO9001, ISO45001, ISO14001, and RoHS to guarantee top-tier international quality and eco-friendly standards.
* OEM/ODM Expert: Send us your drawings or creative ideas-we possess the strong R&D capacity to deliver perfect finished products
T&Y Hardware focuses on the production and supply of all kinds of bolts (including , and and , (such as , , , etc.), (, , ), screws (, , ), anchors (, , ), threaded rods (, , ), high-precision and
Each year, we actively participate in leading hardware and machinery exhibitions worldwide, including the Saudi Building Materials Exhibition, Fastener Fair Stuttgart, Las Vegas Auto Parts Exhibition, Atlanta Machinery Exhibition, and Hannover Messe.
These international platforms allow us to showcase our latest innovations while forging strong connections with top industry leaders. We sincerely look forward to meeting new potential partners at our next stop to explore collaborative business opportunities and drive mutual growth.

Q1: What is your Minimum Order Quantity (MOQ)?
A1: For standard in-stock items, we support small trial orders with no strict MOQ. For mass production or custom orders, the MOQ generally ranges from 100 kg to 500 kg per specification, depending on the product size and processing requirements. Please contact our sales team for specific details.
Q2: How do you ensure the quality of every process?
A2: As an ISO 9001 certified manufacturer, every production stage is strictly monitored by our in-house Quality Control department. We utilize advanced testing equipment (including tensile testing machines, salt spray testers, and thread gauges) to conduct 100% inspections. We provide Material Test Certificates (MTC) for every batch and welcome third-party inspections like SGS or TÜV.
Q3: How long is your delivery time?
A3: For in-stock items, the delivery time is 7 to 10 days. For mass production or custom orders, it generally takes 30 to 45 days, depending on the order volume and specific production requirements.
Q4: What is your payment method?
A4: Our standard payment term is 30% T/T deposit in advance, with the remaining 70% balance paid against the B/L copy. For orders under $1,000 USD, we recommend 100% advance payment via T/T to minimize international bank charges. We also accept L/C at sight for large orders.
Q5: Can you provide free samples?
Optimized: Yes, we provide standard samples free of charge, but the courier/freight cost is covered by the customer. For custom-made samples based on your drawings, a sample tooling fee may apply, which is refundable upon bulk order placement.
Q6: What materials and strength grades can you provide for your fasteners?
A6: We work with a wide range of materials, including Carbon Steel, Alloy Steel, Stainless Steel (SUS304/SUS316), and Brass. For strength grades, we specialize in high-tensile fasteners, offering Grade 4.8, 8.8, 10.9, and 12.9 to meet rigorous industrial and engineering standards.
Q7: What surface treatments do you offer for corrosion resistance?
A7: We provide comprehensive surface finishing options, including Plain, Zinc Plating (White/Yellow/Black), Hot-Dip Galvanized (HDG), Black Oxide, Dacromet, and Geomet. All treatments comply with environmental standards and can meet specific salt spray test requirements.
Q8: Do you support custom packaging and private labeling?
A8: Yes. Our standard export packaging consists of 25kg cartons on sturdy, film-wrapped pallets. However, we fully support custom small box packaging, private labels, and barcode printing to help you build and promote your own brand in your local market.