Model # 9400K-312-HD00L

Internet #202088478

Store SKU #404330

Store SO SKU #1001516996

Stair Parts 3-1/2 in. Steel Rail Bolt

Stair Parts

3-1/2 in. Steel Rail Bolt

$397 /each
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Frequently Bought Together

Product Overview

From stair treads, stair railing and a complete selection of Stair Parts, Surewood-LNL has what you need to make your stairs beautiful. The Surewood-LNL 3-1/2 in. Rail Bolt kit is the professionals choice to install most common stair handrails and fittings. It is made of steel and designed for use in interior rail construction. It comes with a wood plug to cover up the opening following installation and a curved bushing that promotes a snug fit of the hardware against the interior of the stock. The wood plug is installed using common woodworking glue and when the grain is aligned with the stock, produced a beautiful final product.

  • 3-1/2 in. Long
  • Made of steel
  • Wood button plug to cover up the fastener hole after installation
  • For interior use
  • Complements your stair railing system
  • Note: product may vary by store

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Length (in.)
Product Width (in.)


Cap/top included
Color Family
Fillet included
Hardware Included
Product Weight (lb.)
Stair Part Type
Water Resistant

Warranty / Certifications

Manufacturer Warranty
Yes, 1-year limited warranty against manufacturers defects, Limited to replacement of product only, not installation.

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Customer Questions & Answers

Is there a specific wrench needed to tighten the nut? If not what is recommended instruction on tightening the nut?

Asked by: Kurtis
Hi Kurtis, the wrench you need is the Rail Bolt Wrench (Item# 205864570). Standard open-end or box-end wrenches are too big to fit into the hole required for this assembly. The Rail Bolt Wrench is specifically designed to fit and complete partial rotations until the bolt is secure. Feel free to check out the Spring Bolt Rail to Rail Kit (Item# 202755346) if joining fittings and rail sections is your task. The Spring Bolt line of rail joinery kits avoid drilling holes typically used for Rail Bolt Kits. If you have additional questions, we'll be happy to help you. Thank you!
Answered by: Steve Vibert
Date published: 2017-07-04

Can you use a hammer and screwdriver to turn and tighten the nut by tapping it?

Asked by: Qback
Hi Qback, the best method for turning the nut inside the rail is with a rail bolt wrench (item# 205864570). Standard open end wrenches will not fit inside the holes drilled to accept the nut, washer and bushing. Using a hammer and screwdriver may damage your rail and/or the rail bolt kit.
Answered by: Steve Vibert
Date published: 2017-07-04

is this a 5/16" diameter bolt?

Asked by: Joe
Hi Joe, the bolts in these kits may vary, but most are 5/16's with matching nut and washer. We'll be glad to answer other questions for you. Thank you, Steve
Answered by: Steve Vibert
Date published: 2017-03-29

Can this be used to join 2 sections of 6710 handrail, each with a 22.5 degree miter?

Can this be used to join 2 sections of 6710 handrail, each with a 22.5 degree miter?
Asked by: Jeff
  • y_2017, m_8, d_18, h_4CST
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Customer Reviews

3-1/2 in. Steel Rail Bolt is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Perfect solution for joining rail sections Inexpensive, easy to use and highly effective for joining railing sections. Easy to adjust for misalignments during final glue assembly.
Date published: 2014-02-02
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