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.

With ISO9001:2008,iso14001:2004, and especially IAFT16949:2009 certification for the automotive industry. Heatfastener offers fully customized custom bolts and screws, custom nuts according to your needs. We can bring your fastener design to reality, and everything according to your requirements.

Cap nuts

Cap Nuts Details

Acorn nutsとしても知られている。 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:


  • ステンレス - SS302、SS304、SS316、(良い粘り強さ)、ステンレス鋼A2 A4
  • スチール - C45(K1045)、C46(K1046)、C20
  • 真鍮 - C36000(C26800)、C37700(HPb59)、C38500(HPb58)、C27200CuZn37)、C28000(CuZn40)
  • ブロンズ-C51000、C52100、C54400など
  • アルミニウム - Al6061、Al6063など
  • 炭素鋼 – C1006,C1010,C1018,C1022,C1035K,C1045
  • 合金鋼 - SCM435、C10B21、C10B339
  • その他の材料- チタン、UNS C11000 銅、シリコン


  • グレード:グレード4.8、グレード6.8、グレード8.8、グレード10.9、グレード12.9など
  • スタンダードGB、DIN、ISO、ANSI/ASTM、BS、BSW、JIS、メートル、インチ
  • フィニッシュ:プレーン、H.D.G、黒色酸化物、クロム、テフロン、ダクロメット、陽極酸化、ナイロック付き
  • 証明書:ISO9001:2015, ISO14001:2015, IATF16949, ROHS
  • カスタムメイドOEMは顧客のrequirmentsに従って利用できる


  • ヘッドタイプ:フラット、オーバル、バインディング、パン、ラウンド、トラス、ボタン、PF、チーズ、フィリスター、パンワッシャー、シリンダー、六角、インデント六角、ワッシャー
  • ドライブタイプ:プラス, スロット, ファイリップ/スロット, 6ローブ, ピン6ローブ, ポジットドライブ, スクエア, トライアングル, Yタイプ.トライウイング, Sタイプ, Hタイプ, 六角, 5ポイント, 8ポイント, スプライン, スパナ, クラッチ, 六角ピン, トルクスピン
  • 機械ねじ、タッピングねじ、ねじ切りねじ、ねじを形作るねじ切り


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.


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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

We supply all kinds of cap nuts または specialty cap nuts. from small to large.ISO4034 Hexagon Nuts Dimensions sizes chart

Fine Thread 1///
Fine thread 2////1.251.25//1.5
h1Nominal size5.667.58.910.513.515.516.521
max=公称サイズ78101316 | 1718 | 1921 | 222430
6.787.789.7812.7315.73 | 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




深セン熱金物有限公司は、2000年に設立された中国の大手カスタムねじメーカーです。私達は注文ねじ、保証ねじ、Sems ねじ、シカゴねじ、溶接ねじ、長いねじ、マイクロねじ、親指ねじ、止めねじ、注文のボルト、キャリッジ・ボルト、ナットおよび他の注文の締める物を専門にします。業界経験20years以上で。航空宇宙産業、自動車産業、エレクトロニクス、機械電気製品、ロボット、医療産業、通信産業、アウトドアスポーツ製品、スマート家電など、20000社以上のお客様にサービスを提供してきました。


Place the end of a measuring tape on one of the flat sides of the nut’s outer perimeter. Stretch the tape measure across the nut’s diameter to the flat-side directly across from the one you pulling from. If the nut is metric, count the number of lines on the tape measure to find the measurement.

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