{"id":1481,"date":"2020-04-16T12:30:31","date_gmt":"2020-04-16T12:30:31","guid":{"rendered":"http:\/\/fastenerworld.ae\/?post_type=product&p=945"},"modified":"2026-07-06T08:40:00","modified_gmt":"2026-07-06T08:40:00","slug":"cap-doom-nuts","status":"publish","type":"product","link":"https:\/\/asiabolt.om\/ar\/product\/cap-doom-nuts\/","title":{"rendered":"Cap \/ Doom Nuts"},"content":{"rendered":"
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Cap Nuts \u2013 Dome <\/span>Nut & Acorn Nut Manufacturer & Supplier <\/span>in UAE<\/span><\/h4>\n<\/div>\n
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Asia Bolts Industries LLC is a <\/span>trusted <\/span>Cap Nut, Dome Nut, and Acorn Nut manufacturer and supplier<\/span><\/strong> based in Dubai, <\/span>UAE, serving the construction, <\/span>architectural, oil & gas, food <\/span>processing, marine, automotive, and <\/span>general engineering sectors across the <\/span>GCC and global markets since 1997. Our <\/span>Cap Nuts deliver a dual-function <\/span>fastening solution \u2014 providing the full <\/span>clamping performance of a standard hex <\/span>nut while simultaneously enclosing and <\/span>protecting the exposed bolt thread end <\/span>in a precision-formed dome profile that <\/span>enhances safety, aesthetics, and <\/span>long-term corrosion resistance in the <\/span>assembled joint.<\/span><\/p>\n<\/div>\n

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What Are Cap <\/span>Nuts \/ Dome Nuts?<\/span><\/h4>\n<\/div>\n
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Cap Nuts \u2014 <\/span>interchangeably referred to as <\/span>Dome Nuts, Acorn Nuts, Crown Nuts<\/span><\/strong>, <\/span>or <\/span>Blind Nuts<\/span><\/strong> \u2014 are hexagonal nuts <\/span>in which one end is closed by a rounded <\/span>dome-shaped cap formed integrally with <\/span>the nut body. The internal thread <\/span>engages the bolt in the conventional <\/span>manner, while the external dome covers <\/span>the protruding bolt thread end <\/span>completely \u2014 protecting it from <\/span>corrosion, physical damage, and <\/span>providing a smooth, injury-free <\/span>external surface on the assembled <\/span>joint.<\/span><\/p>\n<\/div>\n

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The dome profile serves <\/span>three distinct engineering functions <\/span>simultaneously:<\/span><\/p>\n<\/div>\n

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  • Thread Protection<\/span><\/strong> \u2014 seals the exposed bolt end from <\/span>moisture, salt spray, process fluids, <\/span>and corrosive <\/span>atmospheres that cause thread corrosion <\/span>and seizure, particularly critical in <\/span>GCC coastal and offshore environments<\/span><\/li>\n
  • Personnel Safety<\/span><\/strong> \u2014 eliminates <\/span>sharp, projecting thread ends in public <\/span>spaces, architectural installations, <\/span>walkways, handrails, playground <\/span>equipment, and food processing plant <\/span>where personnel contact with fasteners <\/span>is likely<\/span><\/li>\n
  • Aesthetic Finish<\/span><\/strong> \u2014 the <\/span>smooth dome profile provides a clean, <\/span>professional appearance on visible <\/span>fastener installations in architectural <\/span>steelwork, furniture, signage, and <\/span>decorative metalwork<\/span><\/li>\n<\/ul>\n<\/div>\n
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    They are widely <\/span>used in:<\/span><\/p>\n<\/div>\n

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    • Architectural and structural steelwork<\/span><\/strong> \u2014 handrails, balustrades, fa\u00e7ade <\/span>panels, signage frames<\/span><\/li>\n
    • Food and beverage processing<\/span><\/strong> \u2014 <\/span>hygienic stainless steel installations <\/span>requiring no thread crevices<\/span><\/li>\n
    • Marine and offshore<\/span><\/strong> \u2014 deck <\/span>fittings, handrails, ladder rungs, <\/span>equipment guards<\/span><\/li>\n
    • Automotive and transportation<\/span><\/strong> \u2014 <\/span>wheel bolts, body panel trim, interior <\/span>and exterior fittings<\/span><\/li>\n
    • Oil & gas surface equipment<\/span><\/strong> \u2014 <\/span>instrument enclosures, junction boxes, <\/span>access covers<\/span><\/li>\n
    • Playground and public furniture<\/span><\/strong> \u2014 <\/span>safety-critical installations requiring <\/span>no exposed sharp threads<\/span><\/li>\n
    • Electrical enclosures and switchgear<\/span><\/strong> \u2014 panel cover fastening, terminal box <\/span>closures<\/span><\/li>\n
    • Plumbing and pipework<\/span><\/strong> \u2014 <\/span>decorative and functional cover nuts on <\/span>visible pipe connections<\/span><\/li>\n<\/ul>\n<\/div>\n
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      Types of Cap Nuts \/ Dome Nuts <\/span>Available<\/span><\/h4>\n<\/div>\n
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      1. High Dome Cap Nut \u2014 DIN 1587<\/span><\/strong>
      \nThe <\/span>standard configuration \u2014 a full <\/span>hexagonal nut body with a tall, pronounced <\/span>dome cap providing maximum thread <\/span>coverage and the most generous internal <\/span>thread engagement depth. The most <\/span>widely specified Cap Nut globally and <\/span>the reference standard for metric cap <\/span>nut supply across the GCC. Available <\/span>across the full M3 to M36 metric size <\/span>range in carbon steel, stainless steel, <\/span>and brass.<\/span><\/p>\n<\/div>\n

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      2. Low Dome Cap Nut<\/span><\/strong>
      \nA <\/span>reduced-height dome profile for <\/span>space-constrained applications where <\/span>the full DIN 1587 dome height cannot be <\/span>accommodated, or where a lower profile <\/span>aesthetic is required. Same thread <\/span>protection functionality in a more <\/span>compact form factor. Common in <\/span>automotive trim, electrical panel, and <\/span>architectural applications.<\/span><\/p>\n<\/div>\n

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      3. Thin Hex Cap Nut<\/span><\/strong>
      \nA slim-body <\/span>version combining a reduced hex nut <\/span>height with an integral dome cap \u2014 for <\/span>applications where overall fastener <\/span>stack height must be minimised. Used in <\/span>precision mechanical assemblies and <\/span>compact panel fastening.<\/span><\/p>\n<\/div>\n

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      4. Decorative Chrome-Plated Cap Nut<\/span><\/strong>
      \nCarbon steel or brass cap nuts with <\/span>bright chrome electroplating for <\/span>decorative architectural, automotive, <\/span>and furniture applications. The <\/span>high-gloss chrome dome provides an <\/span>aesthetically superior <\/span>finish for visible fastener <\/span>installations in premium fit-out and <\/span>design projects.<\/span><\/p>\n<\/div>\n

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      5. Stainless Steel Polished Cap Nut<\/span><\/strong>
      \nAISI 316 stainless cap nuts with a <\/span>mirror-polished or satin-brushed dome <\/span>finish for architectural, marine, and <\/span>food-grade hygienic applications. <\/span>Combines full corrosion resistance with <\/span>a premium surface finish quality. <\/span>Standard specification for handrail <\/span>systems, balustrades, and food <\/span>processing installations across the UAE <\/span>and GCC.<\/span><\/p>\n<\/div>\n

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      6. Oversized \/ Custom Dome Cap Nut<\/span><\/strong>
      \nF<\/span>or non-standard thread sizes, large <\/span>diameter applications (M42 and above), <\/span>or bespoke dome profiles required by <\/span>project drawings, Asia Bolts <\/span>manufactures custom Cap Nuts to <\/span>customer specification \u2014 including <\/span>extended dome depth for long thread <\/span>protrusion coverage and custom hex body <\/span>dimensions.<\/span><\/p>\n<\/div>\n

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      Standards & <\/span>Specifications<\/span><\/h4>\n<\/div>\n
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      Standard<\/span><\/th>\nDescription<\/span><\/th>\n<\/tr>\n<\/thead>\n
      DIN 1587<\/span><\/strong><\/td>\nHexagon cap nuts \u2014 high dome, metric <\/span>coarse pitch<\/span><\/td>\n<\/tr>\n
      ASME B18.2.2<\/span><\/strong><\/td>\nHex <\/span>nuts \u2014 inch series (cap nut variants)<\/span><\/td>\n<\/tr>\n
      BS 1768<\/span><\/strong><\/td>\nHexagon cap nuts \u2014 <\/span>British standard<\/span><\/td>\n<\/tr>\n
      ISO 4161<\/span><\/strong><\/td>\nHexagon nuts with flange (associated <\/span>closure standard)<\/span><\/td>\n<\/tr>\n
      ISO 898-2<\/span><\/strong><\/td>\nMechanical properties of nuts \u2014 carbon <\/span>and alloy steel<\/span><\/td>\n<\/tr>\n
      ASTM A563<\/span><\/strong><\/td>\nCarbon and alloy steel nuts<\/span><\/td>\n<\/tr>\n
      ASTM F594<\/span><\/strong><\/td>\nStainless steel nuts \u2014 <\/span>mechanical properties<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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      Non-standard <\/span>dome heights, custom thread depths, and <\/span>project-specific material and coating <\/span>requirements are handled by our <\/span>in-house engineering team.<\/span><\/p>\n<\/div>\n

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      Materials & Grades Available<\/span><\/h4>\n<\/div>\n
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      Material<\/span><\/th>\nGrade \/ <\/span>Specification<\/span><\/th>\nTypical Application<\/span><\/th>\n<\/tr>\n<\/thead>\n
      Carbon Steel<\/span><\/strong><\/td>\nProperty Class 6, 8 (zinc <\/span>plated standard)<\/span><\/td>\nGeneral <\/span>industrial, structural, mechanical<\/span><\/td>\n<\/tr>\n
      Stainless Steel<\/span><\/strong><\/td>\nAISI 304, <\/span>304L, 316, 316L<\/span><\/td>\nMarine, food-grade, <\/span>architectural, offshore<\/span><\/td>\n<\/tr>\n
      Duplex Steel<\/span><\/strong><\/td>\nUNS S31803 (2205) <\/span><\/td>\nOffshore, sour service, coastal <\/span>GCC<\/span><\/td>\n<\/tr>\n
      Brass<\/span><\/strong><\/td>\nCuZn39Pb3, <\/span>CuZn36Pb2Sn1<\/span><\/td>\nDecorative, <\/span>electrical, plumbing, <\/span>instrumentation<\/span><\/td>\n<\/tr>\n
      Alloy Steel<\/span><\/strong><\/td>\nASTM A194 Grade 4, 7<\/span><\/td>\nHigh-strength industrial applications <\/span><\/td>\n<\/tr>\n
      Inconel<\/span><\/strong><\/td>\nAlloy 718<\/span><\/td>\nHigh-temperature, extreme service<\/span><\/td>\n<\/tr>\n
      Titanium<\/span><\/strong><\/td>\nGrade 2 \/ Grade 5<\/span><\/td>\nLightweight, highly corrosive <\/span>environments<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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      Surface treatment and <\/span>finish options include <\/span>zinc electroplating, bright chrome plating, nickel plating, mirror polishing, satin brushing, hot-dip galvanising, PTFE coating, black oxide<\/span><\/strong>, and <\/span>passivation<\/span><\/strong> for stainless <\/span>grades.<\/span><\/p>\n<\/div>\n

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      Dimensions <\/span>& Size Range<\/span><\/h4>\n<\/div>\n
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      Parameter<\/span><\/th>\nRange<\/span><\/th>\n<\/tr>\n<\/thead>\n
      Thread Size<\/span><\/strong><\/td>\nM3 to M64 (metric) <\/span>| No. 6 to 2\u00bd” <\/span>(imperial)<\/span><\/td>\n<\/tr>\n
      Thread Pitch<\/span><\/strong><\/td>\nMetric coarse (standard) \/ <\/span>fine pitch on request<\/span><\/td>\n<\/tr>\n
      Dome Height<\/span><\/strong><\/td>\nHigh dome (DIN 1587) \/ Low <\/span>dome \/ Custom<\/span><\/td>\n<\/tr>\n
      Property Class<\/span><\/strong><\/td>\n6, 8 (metric) | <\/span>Grade A, B (ASTM A563)<\/span><\/td>\n<\/tr>\n
      Finish<\/span><\/strong><\/td>\nZinc plated, <\/span>chrome, nickel, polished, HDG, <\/span>plain<\/span><\/td>\n<\/tr>\n
      Tolerance<\/span><\/strong><\/td>\nPer DIN 1587 \/ ASME B18.2.2 \/ <\/span>customer drawing<\/span><\/td>\n<\/tr>\n
      Thread Form<\/span><\/strong><\/td>\nMetric \/ UNC \/ UNF <\/span>\/ BSF \/ BSP<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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      Complementary Products<\/span><\/h4>\n<\/div>\n
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      Customers <\/span>sourcing Cap Nuts \/ Dome Nuts from Asia <\/span>Bolts Industries frequently specify <\/span>alongside:<\/span><\/p>\n<\/div>\n

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      • Hex Bolts & Machine Screws<\/span><\/strong> \u2014 DIN <\/span>931, DIN 933 for cap nut bolt pairing<\/span><\/li>\n
      • Plain Flat Washers<\/span><\/strong> \u2014 DIN 125, DIN <\/span>9021 for load distribution under cap <\/span>nut hex face<\/span><\/li>\n
      • Stainless Steel Hex Nuts<\/span><\/strong> \u2014 AISI 316 <\/span>for mixed visible \/ concealed nut <\/span>applications<\/span><\/li>\n
      • Hex Flange Nuts<\/span><\/strong> \u2014 <\/span>DIN 6923 where integrated washer <\/span>function is also required<\/span><\/li>\n
      • Dome Head Bolts<\/span><\/strong> \u2014 for matching dome <\/span>aesthetic on both bolt head and nut end<\/span><\/li>\n
      • Stainless Steel Bolts & Screws<\/span><\/strong> \u2014 <\/span>for matched stainless fastener <\/span>assemblies<\/span><\/li>\n
      • Nylon Insert Lock Nuts<\/span><\/strong> \u2014 DIN 985 for vibration resistance on <\/span>non-visible connections<\/span><\/li>\n<\/ul>\n<\/div>\n
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        Asia Bolts can <\/span>supply <\/span>complete matched fastener sets<\/span><\/strong> \u2014 <\/span>bolts, cap nuts, and washers in <\/span>consistent material, grade, and finish <\/span>\u2014 from a single ISO certified <\/span>source for architectural, marine, <\/span>and food-grade projects requiring <\/span>full traceability and aesthetic <\/span>consistency across the <\/span>fastener assembly.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

        Cap Nuts<\/span><\/strong> \u2014 <\/span>also known as <\/span>Dome Nuts, Acorn Nuts<\/span><\/strong>, or <\/span>Crown Nuts<\/span><\/strong> \u2014 by Asia Bolts <\/span>Industries are closed-end <\/span>hexagonal nuts featuring a <\/span>domed cap that covers and <\/span>protects the exposed bolt <\/span>thread end from corrosion, <\/span>contamination, mechanical damage, and <\/span>accidental contact. The enclosed <\/span>dome profile simultaneously serves as <\/span>a thread protection element, <\/span>a finished aesthetic <\/span>cover, and a safety <\/span>feature \u2014 eliminating sharp exposed <\/span>thread ends in public-facing, <\/span>architectural, food-grade, and <\/span>high-traffic industrial environments <\/span>where personnel safety <\/span>and surface finish quality are <\/span>critical requirements.<\/span><\/p>\n

        Manufactured <\/span>to <\/span>DIN 1587, ASME B18.2.2, ISO 4161<\/span><\/strong>,<\/span> and <\/span>BS 1768<\/span><\/strong> standards in carbon steel, stainless <\/span>steel, brass, and exotic alloy <\/span>grades across metric and imperial <\/span>thread forms, our Cap <\/span>Nuts are produced at our <\/span>Dubai Investment Park<\/span><\/strong> facility <\/span>under <\/span>ISO 9001, ISO 45001, and ISO 14001<\/span><\/strong> certified quality systems and exported <\/span>to <\/span>70+ countries<\/span><\/strong> across the GCC, <\/span>Middle East, Africa, and Asia.<\/span><\/p>\n

        \u2705 <\/span>High dome (DIN 1587) & low dome <\/span>variants available<\/span>
        \n\u2705 Carbon steel, <\/span>stainless steel, brass & exotic alloy <\/span>grades<\/span>
        \n\u2705 Polished, chrome-plated & <\/span>decorative finish options<\/span>
        \n\u2705 Standard <\/span>& custom dome profiles manufactured on <\/span>request<\/span>
        \n\u2705 Full MTC documentation & <\/span>batch traceability provided<\/span>
        \n\u2705 ISO <\/span>9001 \u00b7 ISO 45001 \u00b7 ISO 14001 certified<\/span>
        \n\u2705 Approved vendor: Saudi Aramco | <\/span>ADNOC | SABIC<\/span><\/p>\n

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