Brands Guides About
Miller 417C/ 5/8
Miller

Miller 417C/ 5/8" D Bolt Expansion Anchor

A 5/8" steel D-bolt anchor built to hold a fall protection tie-off point in concrete without budging.

$80.08*$85.19Save 5%
✓ In Stock on Amazon.com
View on Amazon

*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

The Miller by Honeywell 417C D-Bolt Expansion Anchor is a dedicated fall protection anchoring solution for construction and industrial worksites where a fixed, reliable tie-off point needs to be established in concrete or masonry. The 5/8" expansion bolt design drives into a pre-drilled hole and mechanically locks against the substrate as the bolt is torqued to spec — creating a rigid, load-bearing anchor point topped by a D-ring profile ready to accept a snap hook or carabiner. This is a purpose-built safety device, not a general-purpose fastener, and it's manufactured by Miller by Honeywell — a recognized name in fall protection systems.

Installation demands preparation: a hammer drill, a correctly sized masonry bit, and a torque wrench to hit the manufacturer's specified installation torque. The process is not complex for anyone with concrete fastener experience, but it is not a casual DIY task either — fall protection anchors are life-safety hardware and installation accuracy directly affects rated performance. The anchor is manufactured in the United States and is packaged in a 9 × 9 × 11 inch box. Once set correctly, the 417C provides a fixed, durable anchor point that requires no further adjustment and withstands the dynamic loads associated with personal fall arrest systems.

Key Features

This product is manufactured in United States

Package length : 9.0"

Package width : 9.0"

Package height : 11.0"

Specifications

Brand
Miller by Honeywell
Model
417C/
Type
D-Bolt Expansion Anchor
Bolt Size
5/8"
Application
Fall protection anchor point — concrete and masonry
Country of Manufacture
United States
Package Dimensions
9.0" × 9.0" × 11.0"

Pros & Cons

👍 Pros

  • 5/8" diameter expansion bolt delivers substantial holding strength in solid concrete — appropriate for fall arrest load requirements.
  • D-ring profile provides a clean, snag-resistant attachment point for snap hooks and carabiners used in fall protection lanyards.
  • Steel construction withstands the mechanical stress of an expansion installation without deforming during tightening.
  • Manufactured in the United States under Miller by Honeywell's safety equipment standards.
  • Straightforward installation process — hammer drill, correct bit, and a torque wrench are the only tools required.

👎 Cons

  • Expansion anchor design means installation is permanent — these cannot be cleanly relocated once set in concrete.
  • Requires a hammer drill and masonry bits for correct installation; a standard cordless drill will not produce a proper-depth hole.
  • No installation hardware or instructions included in the package — users must source the Miller installation guide separately to confirm torque specs.
  • Only rated for solid concrete and masonry — unsuitable for hollow block, wood, or composite substrates.

Frequently Asked Questions

The 417C uses an expansion bolt mechanism, which is engineered for installation into solid concrete or masonry. Expansion anchors work by mechanically wedging against the substrate as the bolt is tightened — they are not appropriate for hollow block, wood framing, or drywall applications.
A 5/8" expansion anchor typically requires a drilled hole of corresponding diameter — you'll need a hammer drill and a 5/8" masonry bit to prep the substrate. Consult the Miller installation guide for exact hole depth and torque specifications to achieve rated holding strength.
The 417C is designed by Miller by Honeywell specifically for fall protection anchoring — it provides the D-ring attachment point for a snap hook or carabiner in a personal fall arrest system. Always verify that installation meets the rated load requirements and that a qualified person inspects the installation before use.
Expansion bolt anchors are generally considered permanent or semi-permanent installations. Once set and loaded, the expansion mechanism deforms slightly to grip the substrate — reuse after removal is not recommended for life-safety applications.
Installation requires a hammer drill capable of driving a 5/8" masonry bit to proper depth, plus a torque wrench to achieve the manufacturer-specified installation torque. A standard cordless drill is generally insufficient for concrete anchor installation at this size.

Related Products