Post Mounting Screw

Post Mounting Screws

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Product Description

Stair Supplies has done extensive research to find the best possible fasteners for installing your cable railing posts. We offer 5/16″ diameter GRK fasteners in two lengths depending on your application. The 4″ screws are perfect for our surface mount or angled foot posts, while the 6″ are required for installing side mount & side mount bump out posts.

Purchase a 4 pack of screws for every 2″ square post you’re going to install.  Single screws are also available if you need extras for your project.

5/16″ x 4″ & 5/16″ x 6″ Hardened Mounting Screws for Cable Rail posts from GRK Fasteners a North American Company.   Extremely easy to install, these screws will make your installation life simple.  These are designed for interior and exterior installations into solid framing materials. The screws require a special driver which is included in our installation kit and is sold separately. We recommend using these in most installations, however some installations might require a different mounting system.

Technical Data:
Bending Yield 190,920 PSI
Tensile Strength 178,051 PSI
Shear Strength 123,592 PSI
Bending Yield 118,360 PSI
Tensile Strength 104,767 PSI
Shear Strength 86,880 PSI


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    Product Q&A

    Catherine Westerbeck
    1 year 2 months ago

    I don’t see black exterior post mounting screws, yet the metal posts are black. Will look bad to have silver or gold screws. Do you offer black screws?

    1 year 2 months ago

    Unfortunately we don’t offer black screws. Most customers like the look of the Stainless Steel screws as it’s the same color as the Stainless Steel fittings & cable that are running through the post. Additionally, once you’ve completed your installation you can always quickly touch up the screw heads with a little flat black paint.
    Please let us know if you have any other questions.

    6 months 21 days ago

    Are these suitable for anchoring to concrete and/or masonry? Exterior stair/guard rail for example.

    6 months 18 days ago

    Thank you for asking, Robert. These screws are designed specifically for anchoring into wood.

    Joe Morris
    3 months 13 days ago

    Surface Mounted Posts on a concrete floor with porcelain floor tiles – Will the Foot Cover allow an expansion anchor w/nut and washer in place of the GRQ screws and still provide a flush-to-floor fit?

    3 months 12 days ago

    Thanks for your question, Joe. For concrete applications with tile, we recommend using our special application surface mount posts . This offers a thicker, wider base plate and foot cover than our standard posts. In Stainless Steel, the special application plate and cover would leave you with 15/16” of room, while an Aluminum plate and cover would give you 7/8” of room.


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