Porcas de capa

Fabricante de porcas personalizadas

Fixador de calor

Porcas de capa


Heatfastener is a professional engaged in the production of Cap nuts and custom screws and 23 years of research and development of screw suppliers that supply made-to-order screws per your print.  Products are widely used in automotive, construction, mining, communications, electronics, and other fields. Our company is equipped with advanced production equipment and testing instruments, such as Taiwan’s multi-station cold heading machine, thread rolling machines, precision stampings for production of hydraulic, as well as precision machining parts Taiwan used automatic lathe, CNC lathe and so on. At the same time, we have several engineers with more than 30 years of experience in machinery manufacturing and development and own specialized testing staff effectively to ensure the quality of the manufactured products. The company always strictly follows the quality management system ISO9001 standards. At present, our products are exported to Europe and the United States, the Middle East, Southeast Asia, Africa, and many other countries and regions. Many professional partners are enjoying our services. We welcome OEM orders and expect to strengthen our business cooperation with customers from all over the world and create a bright future together.

Com certificação ISO9001:2008, iso14001:2004, e especialmente IAFT16949:2009 para a indústria automóvel. Heatfastener oferece parafusos totalmente personalizados e parafusos, porcas personalizadas de acordo com suas necessidades. Nós podemos trazer o seu projeto de fixador para a realidade, e tudo de acordo com suas necessidades.

Cap nuts

Cap Nuts Details

Acorn nuts, também conhecido por Crown Hex Nuts, Blind Nuts, Cap Nuts, or Domed Cap Nuts, are utilized for both safety and appearance. Their crown caps protect and prevent stripping of screws and bolts so they can easily be removed and reused. Acorn nuts also add a finished look to any project and are commonly made with stainless steel or plated with brass or zinc. Low crown (standard) steel cap nuts are usually manufactured in two pieces, a hex nut, and an acorn-shaped top, with a zinc die-cast to form the finished nut. Stainless steel cap nuts are similar in design to the steel nut but made from an austenitic stainless alloy, and can be a one or two-piece style. Additional styles of acorn nuts include high crown and self-locking

Heatfastener carries a wide range of cap nuts in various grades, materials, and styles. We carry both inches and metrics. If you are looking for an uncommon size, length, or material, it is something we can make for you. We can make your hex nut per your print, We can also manufacture these items in special materials and custom made as below listed:


  • Aço inoxidável - SS302, SS304, SS316, (boa tenacidade),Aço inoxidável A2 A4
  • Aço - C45(K1045), C46(K1046),C20
  • Latão - C36000 ( C26800), C37700 ( HPb59), C38500( HPb58),C27200CuZn37), C28000(CuZn40)
  • Bronze-C51000, C52100, C54400, etc
  • Alumínio - Al6061, Al6063 etc
  • Aço carbono – C1006,C1010,C1018,C1022,C1035K,C1045
  • Liga de aço - SCM435,C10B21,C10B339
  • Outros materiais- Titânio, UNS C11000 Cobre, silício


  • Grau: Grau 4.8, Grau 6.8, Grau 8.8, Grau10.9, Grau12.9, etc.
  • Padrão:GB,DIN,ISO, ANSI/ASTM,BS,BSW,JIS, Métrico, Polegada
  • Acabamento:Liso, H.D.G, Óxido preto, Cromo, Teflon, dacromet, Anodizado, Com nylok
  • Certificados: ISO9001:2015, ISO14001:2015,IATF16949, ROHS
  • Feito à medidaOEM está disponível, de acordo com os requisitos do cliente

Tipo de cabeça e tipo de acionamento

  • Tipo de cabeça:Plana, Oval, Vinculada, Pan, Redonda, Treliça, Botão, PF, Queijo, Enchimento, Arruela Pan, Cilindro, Hexágono, Hexágono Dentado, Arruela
  • Tipo de acionamento:Phillips, ranhurado, phiilips/ranhurado, 6 lóbulos, pino 6 lóbulos, Pozidrive, quadrado, triângulo, tipo Y. Tri-wing, tipo S, tipo H, hexágono, 5 pontos, 8 pontos, estriado, chave inglesa, embraiagem, pino hexagonal, pino torx
  • Parafuso de máquina, Parafusos de rosca, Parafuso de corte de rosca, Parafuso de formação de rosca


Use an acorn nut to protect and give a finished look to an exposed bolt end. Cap nuts prevent stripping of screws and bolts on engines, machinery, and wood frames so they can be easily removed and reused. Brass nuts are commonly chosen for plumbing and electrical applications. Use acorn nuts from Grainger to protect exposed ends of threaded fasteners indoors and out.

Além disso, os nossos parafusos, cavilhas e parafusos personalizados são amplamente utilizados nas seguintes indústrias

  • Eletrónica
  • Petroquímica
  • Produtos de consumo
  • Transporte
  • Agricultura
  • Máquinas pesadas
  • Construção
  • Automóvel
  • Médico
  • Militar
  • Aeroespacial
  • Petróleo e gás

An cap nut, also referred to as crown hex nut, blind nut, acorn nut, domed cap nut, or dome nut(UK), is a nut that has a domed end on one side, when used together with a threaded fastener with an external male thread, the domed end encloses the external thread, either to protect the thread or to protect the nearby objects from contact with the thread, in addition, the dome gives a more finished appearance

Acorn nuts are usually made of brass, steel, stainless steel, or nylon, they can be chrome plated and given a mirror finish

There are two types of acorn nuts, one is low, or the standard acorn nut, the other is the high acorn nut, the high acorn nut is wider and higher and will protect extra long studs, there are also self locking acorn nuts that have distorted threads in the hex area to create a tight friction fit to prevent the nut from vibrating loose

Fornecemos todos os tipos de cap nuts ou specialty cap nuts. de pequeno a grande porte.Porcas hexagonais ISO4034 Tabela de dimensões

Thread size(d)M4M5M6M8M10M12M14M16M20
PitchRosca grossa0.70.811.251.51.75222.5
Fine Thread 1///
Fine thread 2////1.251.25//1.5
h1Nominal size5.667.58.910.513.515.516.521
h2Tamanho nominal9.610.5121418.122.526.427.535
rmax=dimensão nominal2.533.
max=dimensão nominal78101316 | 1718 | 1921 | 222430
min6.787.789.7812.7315.73 | 16.7317.73 | 18.6720.67 | 21.6723.6729.16
per 1000 units kg1.41.553.35.310.1 | 10.718.3 | 19.026.1 | 26.837.1111

Precisa de porcas personalizadas para a sua indústria?

Como fabricante com 20 anos de experiência na indústria e com uma fábrica equipada com máquinas de precisão, podemos fornecer, desde a consulta até à produção, uma solução única para si.

Sobre nós

Shenzhen Heat Hardware Co., Ltd é um fabricante líder de parafusos personalizados na China, fundado em 2000 anos. Somos especializados em parafusos personalizados, parafusos de segurança, parafusos Sems, parafusos Chicago, parafusos de solda, parafusos longos, micro parafusos, parafusos de polegar, parafusos de ajuste, parafusos personalizados, parafusos de carro, porcas e outros fixadores personalizados. Com mais de 20 anos de experiência no sector. Atendemos mais de 20000 clientes, incluindo a indústria aeroespacial, indústria automotiva, eletrônica, produtos mecânicos e elétricos, robôs, indústria médica, indústria de comunicações, produtos esportivos ao ar livre, aparelhos inteligentes, etc. podemos fornecer um serviço personalizado de fixador único para você, não importa o tipo de fixador personalizado que você precisa.

Perguntas mais frequentes

Coloque a extremidade de uma fita métrica num dos lados planos do perímetro exterior da porca. Estique a fita métrica ao longo do diâmetro da porca até ao lado plano diretamente oposto àquele de onde puxou. Se a porca for métrica, contar o número de linhas na fita métrica para encontrar a medida.

A cap nut serves to protect the bolt threads underneath, but also provides a cleaner appearance, and may improve safety on certain joints and applications. When your application requires a smooth finish or all rough-edged fasteners and exposed threads must be covered, cap nuts provide an excellent solution.

These axle caps really aren’t designed to be reused, but they can be if they’re removed carefully. i.e., when you get them off, you might find you have to run to the store to get replacements anyway

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