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    AI Overview
    Hillman M6 x 40 mm External Hex Hex-Head Cap Screw (7-Pack ...
    Inner hexagon bolts (socket head) and outer hexagon screws (hex cap/bolts) are primary fastening components. Inner hex types are circular with a recessed socket, requiring an Allen key, while outer hex types have a six-sided head tightened with a wrench or socket. Both offer high torque capability and are used in machinery. 
    Key Differences: 
    • Head Design: Inner hexagon (Allen) bolts are compact and cylindrical, often used for recessed applications. Outer hexagon bolts have a traditional hexagonal head, ideal for external tightening and high-torque applications.
    • Tools: Inner hexagon bolts require Hexagonal socket keys (Allen wrenches). Outer hexagon screws require standard spanners, wrenches, or sockets.
    • Application: Outer hex screws are often used with nuts, whereas inner hex bolts are ideal for narrow spaces.
    • Thread Types: Both can be fully threaded or partially threaded (shoulder bolts). 
    Specialty Fasteners:
    Some specialized bolts, such as those sometimes found on solar mounting brackets, may feature both an outer hexagonal shape and a hollow inner, or an inner hole for security purposes (security hex). 
    Removal Tips: 
    • Rounded Allen Bolt: Use a punch to create a notch, mole grips, or specialized screw extractors.
    • Outer Hex Bolt: If stripped, use an RPT socket extractor or weld a new nut onto the top. 
    For standard hex head bolts, you can explore options from The Home Depot. 
    • How to remove rounded Allen head bolts | remove rounded ...
      Jun 10, 2018 — in this video I'm going to demonstrate some ways of removing rounded Allen head bolts. there are a lot of variables when doing job...
      13m
      YouTube·Ultimate Handyman
    • What's the difference between outer hexagon screws and inner ...
      What's the difference between outer hexagon screws and inner hexagon screws? | Sic-solar.com * Outer hex screws and inner hex scre...
      Sic-solar.com
    • What is this kind of screw and how do I get it out? Circle inner ring, hexagonal outside.
      Jan 29, 2025 — It looks like you're looking at a security hex bolt. It has a special type Allen key with a hole in the middle to accommodate the ...
      Reddit
    • 2 Easy Methods! To Remove a Rounded Hex Fastener with ...
      May 17, 2025 — all it's doing is just rounding it out no engagement in this circumstance. we can use our external. and internal so I'll show you ...
      2m
      YouTube·Grip Edge Tools
    • Tap Bolt versus Hex Cap Screw
      Sep 15, 2020 — Tap bolts are fully threaded, meaning the threads extend along the entire length of the bolt. On the other hand, hex cap screws ar...
      Lightning Bolt, Inc.
    • What is the difference between a hex bolt and a hex screw?
      Use: Hex bolts are typically used with a nut to fasten two pieces of material together, while hex screws are typically screwed dir...
      jiangsu zsa industry co., ltd.
    • Inner Hexagon Bolt VS Outer Hexagon Bolt - KENENG
      Structurally, it is easy to identify the inner hexagon bolt and the outer hexagon bolt. There is basically no difference in the th...
      KENENG
    • How to choose the outer hexagon and inner hexagon bolts?
      Structurally, hexagon socket bolts and external hexagon bolts are easy to distinguish. There is basically no difference in the thr...
      Dongguan Jide Precision Machinery Technology Co., Ltd.
    • Inner hexagon bolt outer hexagon screw - Sic-solar.com
      Solar mounting hex bolt inner hexagon are also called hexagonal screw head bolts,hex-cap bolts,or machine bolts,widely used for so...
      Sic-solar.com
    • Hillman - 1/2 in. x 3 in. External Hex Hex-Head Cap Screw (3-Pack)
      About This Product Hex cap screws are bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. These...
      The Home Depot
    • hex cap screws vs Socket Head Cap Screws: Bolt Guide
      Nov 24, 2025 — Installation Torque Hex cap screws: Higher torque possible due to external hex allowing larger wrenches and better leverage. Socke...
      SC Fastening Systems
    • How to remove rounded Allen head bolts | remove rounded ...
      Jun 10, 2018 — in this video I'm going to demonstrate some ways of removing rounded Allen head bolts. there are a lot of variables when doing job...
      13m
      YouTube·Ultimate Handyman
    • What's the difference between outer hexagon screws and inner ...
      What's the difference between outer hexagon screws and inner hexagon screws? | Sic-solar.com * Outer hex screws and inner hex scre...
      Sic-solar.com
    • What is this kind of screw and how do I get it out? Circle inner ring, hexagonal outside.
      Jan 29, 2025 — It looks like you're looking at a security hex bolt. It has a special type Allen key with a hole in the middle to accommodate the ...
      Reddit
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    Web results

    Inner hexagon bolt outer hexagon screw


    Sic-solar.com
    https://www.sic-solar.com › inner-hexagon-bolt-outer-h...
    Sic-solar.com
    https://www.sic-solar.com › inner-hexagon-bolt-outer-h...
    Solar mounting hex bolt inner hexagon are also called hexagonal screw head bolts,hex-cap bolts,or machine bolts,widely used for solar panels installation ...Read more
    Inner hexagon bolt outer hexagon screw from www.sic-solar.com

    Binding - Hex Bolts / Bolts: Industrial & Scientific


    Amazon.com
    https://www.amazon.com › Hex-Bolts-Binding
    Amazon.com
    https://www.amazon.com › Hex-Bolts-Binding
    M2 .5 M3 M4 M5 M6 M8 M10 M12 M14 M16 Pure Titanium TA2 External Hex Hexagon Head Cap Screw Bolt Length 5-100mm(40mm,1pc M10).Read more
    Popular products
    • 33% OFF
      304 Stainless Steel Outer Hexagon Internal and External Threads Bolt Adaptable Screw Hollow Helical. 33% OFF.
      304 Stainless Steel Outer Hexagon Internal and External Threads Bolt Adaptable Screw Hollow Helical
      $1.94$2.90
      AliExpress
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      304 Stainless Steel Outer Hexagon Internal and External Threads Bolt Adaptable Screw Hollow Helical
      $1.94$2.90
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    • M16 M18 M20 Inner Outer Thread Hex Head Screw Hollow Threaded.
      M16 M18 M20 Inner Outer Thread Hex Head Screw Hollow Threaded
      $16.99
      eBay - fran-dough
      M16 M18 M20 Inner Outer Thread Hex Head Screw Hollow Threaded
      $16.99
      eBay - fran-dough
    • Hillman Group Internal Hex Socket Cap Screw 10-Pack.
      Hillman Group Internal Hex Socket Cap Screw 10-Pack
      $8.83
      Home Depot
      Free delivery
      5.0(1)
      Hillman Group Internal Hex Socket Cap Screw 10-Pack
      $8.83
      Home Depot
      Free delivery
      5.0(1)
    • 304 Stainless Steel Outer Hexagon Internal And External Threads Bolts Adaptable Screw Hollow Helical.
      304 Stainless Steel Outer Hexagon Internal And External Threads Bolts Adaptable Screw Hollow Helical
      $0.99
      AliExpress
      304 Stainless Steel Outer Hexagon Internal And External Threads Bolts Adaptable Screw Hollow Helical
      $0.99
      AliExpress
    • Hillman M6- 1.00 x 10 mm Internal Hex Button-Head Cap Screws (6-Pack.
      Pickup, 6 mi
      Hillman M6- 1.00 x 10 mm Internal Hex Button-Head Cap Screws (6-Pack
      $3.48
      Home Depot
      4.5(10)
      Pickup, 6 mi
      Hillman M6- 1.00 x 10 mm Internal Hex Button-Head Cap Screws (6-Pack
      $3.48
      Home Depot
      4.5(10)
    • HEXAGON INNER SOCKET BOLT.
      HEXAGON INNER SOCKET BOLT
      $2.20
      Scooterworks USA
      HEXAGON INNER SOCKET BOLT
      $2.20
      Scooterworks USA
    • BD4802-37 Inner Hex Screw M6×25.
      BD4802-37 Inner Hex Screw M6×25
      $1.00
      Bucktool Official
      Free delivery
      BD4802-37 Inner Hex Screw M6×25
      $1.00
      Bucktool Official
      Free delivery
    • Hillman M6- 1.00 x 50 mm Internal Hex Socket Cap-Head Cap Screws (5.
      Pickup, 6 mi
      Hillman M6- 1.00 x 50 mm Internal Hex Socket Cap-Head Cap Screws (5
      $8.80
      Home Depot
      Free delivery
      4.0(2)
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      Hillman M6- 1.00 x 50 mm Internal Hex Socket Cap-Head Cap Screws (5
      $8.80
      Home Depot
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      4.0(2)

    Web results

    Outer hexagon bolts - XINCHI


    XINCHI
    https://www.xinchi-industry.com › NEWS
    XINCHI
    https://www.xinchi-industry.com › NEWS
    Today we are going to discuss with you the advantages and disadvantages of outer hexagon screws and inner hexagon screws. Outer hexagon bolts. Outer Hexagon ...Read more
    Inner hexagon bolt outer hexagon screw from www.xinchi-industry.com

    Inner Hexagon Bolt VS Outer Hexagon Bolt


    KENENG
    https://www.kenenghardware.com › Blog
    KENENG
    https://www.kenenghardware.com › Blog
    Structurally, it is easy to identify the inner hexagon bolt and the outer hexagon bolt. There is basically no difference in the thread part. The outer hexagon ...Read more
    Inner hexagon bolt outer hexagon screw from www.kenenghardware.com
    More products
    • Hillman M6-1 x 12 mm Internal Hex Flat-Head Cap Screws (8-Pack).
      Pickup, 6 mi
      Hillman M6-1 x 12 mm Internal Hex Flat-Head Cap Screws (8-Pack)
      $4.13
      Home Depot
      5.0(2)
      Pickup, 6 mi
      Hillman M6-1 x 12 mm Internal Hex Flat-Head Cap Screws (8-Pack)
      $4.13
      Home Depot
      5.0(2)
    • Inner Hex Screw.
      Inner Hex Screw
      $1.00
      Bucktool Official
      Free delivery
      5.0(1)
      Inner Hex Screw
      $1.00
      Bucktool Official
      Free delivery
      5.0(1)
    • Outer hexagon round screw M10x30.0.
      Outer hexagon round screw M10x30.0
      $5.61
      fvd.net
      Outer hexagon round screw M10x30.0
      $5.61
      fvd.net
    • 2pcs M6 Sus304 External Hexagon Screw Hex Head Hollow Through Hole.
      2pcs M6 Sus304 External Hexagon Screw Hex Head Hollow Through Hole
      $13.99
      eBay - fran-dough
      2pcs M6 Sus304 External Hexagon Screw Hex Head Hollow Through Hole
      $13.99
      eBay - fran-dough
    • Harfington M6x25mm Hollow External Hexagon Screw.
      Harfington M6x25mm Hollow External Hexagon Screw
      $5.87
      Harfington
      Free delivery on $30+
      Harfington M6x25mm Hollow External Hexagon Screw
      $5.87
      Harfington
      Free delivery on $30+
    • Harfington M6x20mm Hollow External Hexagon Screw.
      Harfington M6x20mm Hollow External Hexagon Screw
      $5.78
      Harfington
      Free delivery on $30+
      Harfington M6x20mm Hollow External Hexagon Screw
      $5.78
      Harfington
      Free delivery on $30+
    • 40% OFF
      Unique Bargains M6 x 30mm Alloy Steel Internal Hex Drive Socket Cap Head Screw DIN912 30pcs. 40% OFF.
      Unique Bargains M6 x 30mm Alloy Steel Internal Hex Drive Socket Cap Head Screw DIN912 30pcs
      $15.49$26
      Walmart - Tasharina Corp       & more
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      4.0(1)
      40% OFF
      Unique Bargains M6 x 30mm Alloy Steel Internal Hex Drive Socket Cap Head Screw DIN912 30pcs
      $15.49$26
      Walmart - Tasharina Corp       & more
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      4.0(1)
    • Hexagon hex bolt.
      Hexagon hex bolt
      $3.01
      Omega Parts International
      Hexagon hex bolt
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      Omega Parts International
    People also ask
    What is the difference between a hex bolt and a hex screw?
    An error has occurred. Please try again later.
    What are internal hexagon screws?
    Internal hex screws: Internal hex screws have an internal-facing head indentation and are a common choice for furniture pieces. They require an Allen wrench for installation and removal. Combi screw: Combination screws, also called combi screws, refer to any screw type that combines more than one head style.Jun 10, 2021

    Different Types of Hex Head Screws | All Points Fasteners


    All Points Fasteners
    https://allpointsfasteners.com › blog › different-types-of-...
    All Points Fasteners
    https://allpointsfasteners.com › blog › different-types-of-...
    What is an external hex screw?
    Outer hexagon bolts

    Generally, external hexagon screws are partially threaded. Full-threaded outer hexagon screws are mainly used for short outer hexagon screws with nominal length and longer thread requirements. External hexagon screws with holes are used when external hexagon screws are needed for locking.

    Advantages And Disadvantages Of Outer Hexagon Bolt And ...


    XINCHI
    https://www.xinchi-industry.com › NEWS
    XINCHI
    https://www.xinchi-industry.com › NEWS
    What is the difference between a hexagon head bolt and a hexagon flange bolt?
    Hex Bolts: Feature a six-sided head and require a separate washer for secure fastening. Flange Bolts: Have a built-in flange under the head, which acts as an integrated washer, providing a larger surface area for load distribution.

    Hex Bolt vs Flange Bolt: Key Uses & Differences - TUHU Fasteners


    TUHU Fasteners
    https://tuhufasteners.com › hex-bolt-vs-flange-bolt
    TUHU Fasteners
    https://tuhufasteners.com › hex-bolt-vs-flange-bolt

    Web results

    What is this kind of screw and how do I get it out? Circle ...


    Reddit · r/HomeMaintenance
    20+ comments · 1 year ago
    Reddit · r/HomeMaintenance
    20+ comments · 1 year ago
    It's a security head bolt that uses an Allen type wrench but has a hole in the center , you can buy a set of them online for under $15.Read more
    22 answers  ·  Top answer: A socket may work better than a wrench
    Why do we predominantly still use Hex bolts and ...
    207 answers
    Jun 15, 2025
    Eli5 : Why don't we use hex bolts on everything ...
    406 answers
    Jul 12, 2024
    More results from www.reddit.com

    Hex Bolts


    The Home Depot
    https://www.homedepot.com › ... › Fasteners › Bolts
    The Home Depot
    https://www.homedepot.com › ... › Fasteners › Bolts
    1/2-13 in. x 8 in. Galvanized Hex Bolt. Hex bolts are hexagonal head fasteners with machine threads. They are commonly used for machinery and construction ...Read more
    Inner hexagon bolt outer hexagon screw from www.homedepot.com
    4.6 store rating (4.1K) · $3 to $77 · Store nearby (
    1.8 mi
    )     · Free in-store returns
    Missing: Inner ‎outer
    Images
    Inner Hexagon Bolt VS Outer Hexagon Bolt | KENENG
    Inner Hexagon Bolt VS Outer Hexagon Bolt | KENENG
    KENENG
    What's the difference between outer hexagon screws and inner ...
    What's the difference between outer hexagon screws and inner ...
    Sic-solar.com
    Inner Hexagon Bolt VS Outer Hexagon Bolt | KENENG
    Inner Hexagon Bolt VS Outer Hexagon Bolt | KENENG
    KENENG
    Best Inner hexagon bolt outer hexagon screw Supplier,Inner ...
    Best Inner hexagon bolt outer hexagon screw Supplier,Inner ...
    Sic-solar.com
    The Difference Between Hex Bolts And Outer Hex Bolts| XINCHI
    The Difference Between Hex Bolts And Outer Hex Bolts| XINCHI
    XINCHI
    MECCANIXITY M6x25mm Hollow Screw Bolts External Hexagon ...
    MECCANIXITY M6x25mm Hollow Screw Bolts External Hexagon ...
    Amazon.com
    Advantages And Disadvantages Of Outer Hexagon Bolt And Inner ...
    Advantages And Disadvantages Of Outer Hexagon Bolt And Inner ...
    XINCHI
    Inner Hexagon Bolt VS Outer Hexagon Bolt | KENENG
    Inner Hexagon Bolt VS Outer Hexagon Bolt | KENENG
    KENENG
    Fast Delivery, Cost-effective Round Head Internal Hexagon Bolts
    Fast Delivery, Cost-effective Round Head Internal Hexagon Bolts
    Alibaba.com
    Hex Bolts vs. Other Fasteners: When and Why to Use Them
    Hex Bolts vs. Other Fasteners: When and Why to Use Them
    Troop Industrial
    304 Stainless Steel Outer Hexagon Internal And External ...
    304 Stainless Steel Outer Hexagon Internal And External ...
    AliExpress
    Hillman M6 x 40 mm External Hex Hex-Head Cap Screw (7-Pack) 4170
    Hillman M6 x 40 mm External Hex Hex-Head Cap Screw (7-Pack) 4170
    The Home Depot
    All images
    Show more images

    Web results

    How to choose the outer hexagon and inner hexagon bolts?


    Dongguan Jide Precision Machinery Technology Co., Ltd.
    https://ba.jidemachinery.com › info › how-to-choose-the...
    Dongguan Jide Precision Machinery Technology Co., Ltd.
    https://ba.jidemachinery.com › info › how-to-choose-the...
    Jan 1, 2023 — Structurally, hexagon socket bolts and external hexagon bolts are easy to distinguish. There is basically no difference in the threaded part.Read more

    M5 M6 SUS304 inner outer thread hex head ...


    eBay
    https://www.ebay.com › ... › Screws & Bolts
    eBay
    https://www.ebay.com › ... › Screws & Bolts
    M5 M6 SUS304 inner outer thread hex head screw hollow threaded conversion bolt · Buy It Now · Add to cart. Adding to your cart · Add to Watchlist ...Read more
    Inner hexagon bolt outer hexagon screw from www.ebay.com
    $15.99 · $7.95 delivery

    304 Stainless Steel Outer Hexagon Internal And ...


    AliExpress
    https://www.aliexpress.com › ...
    AliExpress
    https://www.aliexpress.com › ...
    Shop high-quality 304 stainless steel bolts with hexagon outer and internal threads. Adaptable hollow helical nuts available in sizes M6-M20, including 1 2 ...
    Inner hexagon bolt outer hexagon screw from www.aliexpress.com
    $0.70 · In stock · 4.9(22) · 15-day returns
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