See Rod Railing Post Hardware

Mounting Screws


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Rise & Run Details

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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 fasteners in two lengths depending on your application. The 3.5″ 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. These are constructed from 316 Stainless Steel and utilize a T-30 bit.

Purchase a 4 screws for every 2″ square post you’re going to install.

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

Completed Projects

This product has been used in the following "Completed Projects"

    Product Q&A

    Catherine Westerbeck
    8 years 3 hours 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?

    Stair Supplies
    7 years 11 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.

    7 years 4 months ago

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

    Stair Supplies
    7 years 4 months ago

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

    Joe Morris
    7 years 27 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?

    Stair Supplies
    7 years 26 days ago

    Thanks for your question, Joe. For concrete applications with tile, we recommend using our special application 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.