Klein Tools Impact Socket NRHD4 6-in-1 Square Utility Wrench (7/16 Hex 1/2 Drive Coaxial Spring Loaded Lineman Pole Hardware Bolt Tightening)

Klein Tools NRHD4 6-in-1 Square Lineman Impact Socket Wrench

The Klein Tools NRHD4 6-in-1 square impact socket tightens utility pole lag screws, installs crossarm braces, adjusts guy wire hardware, and spins nuts onto long threaded rods without manual socket changeouts. Engineered with two nested coaxial spring-loaded sockets and integrated alignment slots, this heavy-duty 2.0-lb impact attachment fits 3/4-inch, 13/16-inch, 1-inch, and 1-1/8-inch square nuts along with utility hardware on 1/2-inch, 5/8-inch, and 3/4-inch pole bolts. Featuring a 6.0-inch hollow shaft with a 13/16-inch internal diameter for clearing extended all-thread studs, an ASME B107.2 impact steel rating, and a 7/16-inch hex quick-change adapter with cross-hole retention, it equips power utility linemen, distribution technicians, and telecom contractors with hands-free aerial fastening efficiency.

Best Used For:

• Utility Pole Hardware Installation & Removal: Fastening square nuts and crossarm mounting bolts across 1/2-inch, 5/8-inch, and 3/4-inch utility pole lines.
• Extended Threaded Rod and Stud Driving: Passing long all-thread studs through the 6-inch hollow barrel to torque deep utility fasteners continuously without bottoming out.
• Eye-Bolt and J-Hook Hardware Alignment: Tightening and loosening curved utility pole suspension hardware and ground attachments using built-in alignment slots.

Key Performance & Safety Features

• Hands-Free Coaxial Socket Stepping: Nested spring-loaded sleeves depress automatically under applied forward pressure to switch between four square socket profiles instantly.
• Integrated Pole Hardware Alignment Slots: Machined high-torque slots engage and drive utility pole eyelet fasteners, J-hooks, and grounding hardware without accessory tools.
• 6-Inch Deep Hollow Barrel: 13/16-inch inside diameter hollow pass-through body accommodates extended bolt shanks and long all-thread rods during pole framing.
• Heavy-Duty Impact-Grade Steel: Hardened alloy steel construction meets ASME B107.2 structural standards to absorb continuous cyclic hammer blows from utility impact guns.
• Cross-Hole Adapter Retention Pin: Positive cross-pin locking design prevents the 7/16-inch quick-change adapter and socket from separating during aerial bucket operation.
• High-Visibility Double-Line Sizing Bands: Color-coded alignment bands allow aerial line workers to identify socket sizes and drive slots quickly in dim working conditions.

What's Included

• (1) Klein Tools NRHD4 6-in-1 Square Lineman Impact Socket Wrench
• (1) 7/16" Hex to 1/2" Square Quick-Change Impact Drive Adapter (Cat. No. NRHDA4)

Technical Specifications

Pro-Tip: Push the impact socket straight onto the fastener to depress the outer sleeve when engaging smaller 3/4-inch or 13/16-inch hardware; the internal spring immediately steps the tool down without requiring linemen to remove insulated gloves or swap heavy sockets in aerial bucket trucks.