Klein 651QS Quad-4 SAE impact flip socket displaying 1/4, 3/8, 7/16, and 5/16-inch sizes on a quick-change hex extension shaft.
Diagram detailing 4 SAE sizes in 1 socket body, color-coded bands, deep-well profile, and impact-rated alloy steel construction.
Diagram demonstrating spring-loaded coaxial action where applying pressure retracts inner sleeve walls to engage larger imperial hex heads.
Overview of included components showing the Klein Quad-4 SAE flip socket alongside its 3.5-inch impact extension adapter shaft.
Klein 651QS Quad-4 SAE flip socket mounted on a power impact driver chuck to highlight high-torque impact compatibility.
How A Quad Socket Works (651QS, 652QS, 653QS, 654QS and 656QS) promotional video
Klein 651QS Quad-4 SAE impact flip socket displaying 1/4, 3/8, 7/16, and 5/16-inch sizes on a quick-change hex extension shaft.
Diagram detailing 4 SAE sizes in 1 socket body, color-coded bands, deep-well profile, and impact-rated alloy steel construction.
Diagram demonstrating spring-loaded coaxial action where applying pressure retracts inner sleeve walls to engage larger imperial hex heads.
Overview of included components showing the Klein Quad-4 SAE flip socket alongside its 3.5-inch impact extension adapter shaft.
Klein 651QS Quad-4 SAE flip socket mounted on a power impact driver chuck to highlight high-torque impact compatibility.
How A Quad Socket Works (651QS, 652QS, 653QS, 654QS and 656QS) promotional video
KLEIN TOOLS

Klein Tools SAE Impact Flip Socket 651QS 1 Piece Quad 4 (1/4 Inch Drive 4 in 1 Imperial Spring Loaded Steel Hex Fastening Adapter)

Only 2 left
SKU: 651QS
$19.98 USD

Description

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Klein Tools 651QS Quad-4 SAE 4-in-1 Coaxial Heavy-Duty Impact Flip Socket

The Klein Tools 651QS Quad-4 SAE Impact Flip Socket consolidates four primary imperial hex dimensions into a single dual-ended reversible socket body designed to attach directly onto 1/4-inch hex flip socket impact extension shanks. Forged from heat-treated cold-forged alloy steel with high-torque impact rating, this 2.72 oz (0.17 lb) ASME B107.2 compliant tool measures 4.2 inches long by 0.68 inches wide and houses internal spring-loaded coaxial socket sleeves across 1/4-inch, 5/16-inch, 3/8-inch, and 7/16-inch hex sizes. Engineered to absorb extreme rotational impact loads, this multi-size attachment allows electrical contractors, HVAC technicians, and sheet metal installers to compress internal socket walls against bolt heads for instant hands-free size transitions without detaching the socket from power impact drivers.

Best Used For:

  • Sheet Metal & Ductwork Screws: Driving HVAC sheet metal screws, zip screws, and duct flange fasteners requiring 1/4-inch, 5/16-inch, 3/8-inch, and 7/16-inch imperial hex dimensions without carrying individual socket bits.
  • Electrical Panel & Grounding Fastening: Fastening terminal ground lugs, transformer taps, and enclosure panel bolts utilizing a deep-well coaxial socket profile.
  • 1/4-Inch Impact Shank Integration: Mounting onto standard 1/4-inch hex flip socket extension shafts or quick-change impact drivers for rapid high-torque power fastening.

Key Performance & Safety Features

  • 4-in-1 Quad-4 Coaxial SAE Socket: Integrates 1/4-inch, 5/16-inch, 3/8-inch, and 7/16-inch imperial hex sizes into a single dual-ended reversible tool.
  • Hands-Free Spring-Loaded Compression: Inner coaxial socket sleeve retracts under forward force, providing immediate access to larger hex heads without stopping for manual adjustment.
  • Heat-Treated Cold-Forged Steel Metallurgy: Heavy-duty impact-rated alloy steel construction withstands high rotational torque and vibration without cracking drive walls or stripping fastener corners.
  • Industry-Standard Color-Coded Bands: Painted visual identification rings allow instant size detection inside dark junction boxes or cluttered tool bags.
  • Deep Well Access Profile: Reaches recessed bolts, long threaded studs, and tight enclosure corners with maximum gripping force.
  • ASME B107.2 Industry Standard Compliance: Precision-manufactured to satisfy rigorous ASME structural and mechanical strength specifications for power impact tools.

What's Included

  • (1) Klein Tools 651QS Quad-4 Coaxial Reversible 4-in-1 Heavy-Duty SAE Impact Flip Socket (1/4", 5/16", 3/8", 7/16")

Technical Specifications

Brand Manufacturer Klein Tools®
Model Part Number OEM SKU 651QS
Tool Classification System Quad-4 4-in-1 Coaxial SAE Impact Flip Socket
Core Metallurgy Material Heat-Treated Cold-Forged Steel
Primary Input Drive Interface 1/4 inch Hex Drive Shank Connection
Integrated SAE Socket Sizes 1/4 inch, 5/16 inch, 3/8 inch, and 7/16 inch Hex
Socket Point Profile Geometry 6-Point Deep Well Profile
Fastener Transition Action Hands-Free Coaxial Spring-Loaded Compression & Reversible Flip Body
Manufacturing Quality Standards ASME B107.2 Compliant
Visual Identification System Color-Coded Painted Rings
Overall Length x Width x Height 4.2 inches L x 0.68 inches W x 0.68 inches H (10.7 x 1.7 x 1.7 cm)
High-Voltage Insulated Frame No (Uninsulated - do not use on energized electrical circuits)
Total Piece Count 1 Piece
Assembled Net Product Weight 2.72 oz / 0.17 lb (77 g)
Global Trade Item Number GTIN 00092644380105

Pro-Tip: To drive 1/4-inch or 5/16-inch hex screws, push the driver forward firmly against the fastener face so the internal coaxial spring depresses. To engage larger 3/8-inch or 7/16-inch hardware, ease forward pressure or flip the socket on your 1/4-inch extension shaft to utilize the outer socket wall profile directly.