Klein Tools 663 #3 Square Rece...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10.69
Klein Tools 663 #3 Square Recess Tip Screwdriver, 4-Inch Round Shank

Klein Tools 663 #3 Square Recess Tip Screwdriver, 4-Inch Round Shank

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Model: KLN663

In Stock (leaves warehouse same day if ordered before 3pm ET)

$10.69
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Klein Tools 663 #3 Square Recess Tip Screwdriver, 4-Inch Round Shank

The Klein Tools 663 is a #3 square recess screwdriver featuring a 4-inch round shank, purpose-built to match square-drive (Robertson-style) fastener heads. The #3 tip size is engineered to seat firmly in the fastener recess, helping to minimize slippage and cam-out while turning. With its 4-inch round shank, the 663 offers a manageable length for both bench work and field use, making it a practical addition to any screwdriver set. Klein Tools designs the 663 as a single-purpose driver, giving electricians, contractors, and maintenance professionals the right tip size on hand when square recess fasteners are part of the job.

Key Features

  • #3 Square Recess Tip: Matches square-drive (Robertson-style) fastener heads for a secure, positive engagement that helps reduce cam-out and slippage while driving.
  • 4-Inch Round Shank: A manageable 4-inch length provides reach into recessed screw locations while keeping the tool compact and easy to control in tight spaces.
  • Round Shank Profile: The round shank allows smooth, even turning and can be gripped with pliers or a nut driver for added leverage when extra torque is needed.
  • Single-Tip Design: Built as a dedicated #3 square recess driver, the 663 delivers consistent torque transfer and a reliable fit on compatible fasteners every time.
  • Compact, Purpose-Built Tool: Sized for everyday fastening tasks, the 663 is a practical choice to keep on hand alongside other screwdriver tip sizes and styles.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Electrical Panel and Enclosure Assembly Work
  • General Maintenance, Repair, and Service Tasks
  • Square-Drive (Robertson-Style) Fastener Installation
  • Appliance, Fixture, and Equipment Assembly
  • Professional Toolboxes and DIY Tool Kits

Why Klein Tools?

Klein Tools has built a reputation among electricians, contractors, and maintenance professionals for hand tools designed to perform reliably on the jobsite. The 663 #3 square recess screwdriver is sized and configured specifically for square-drive fasteners, giving users a dependable, single-purpose tool rather than a general-purpose compromise. Whether used for panel assembly, equipment servicing, or general repair work, the 663 gives users a dedicated tool matched to the #3 square recess fastener size. Keeping a dedicated #3 square recess driver like the 663 on hand helps ensure the correct tip is always available when square-drive fasteners need to be installed or removed. It's a straightforward, functional addition to a professional or home tool collection.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
KLN-20260918
Product Type:
Screwdriver
Configuration:
#3 Square Recess Tip
Department:
Electrical
Product Subgroup:
Screwdrivers & Drivers
Product Group:
Hand Tools
Country Of Origin:
United States
Product Weight:
0.3 lb
Product Depth:
8.25 in
Product Width:
1 in
Product Height:
1 in
Product Material:
Steel

Klein Tools KLN663 – Frequently Asked Questions

1) Will a Klein 663 screwdriver fit Robertson square-drive screws?
Yes. The Klein Tools 663 is a #3 square recess driver, which is the size that matches #3 square-drive (Robertson-style) fastener heads. Square recess sizes run #0 through #3, so if the screws in your job are a smaller square recess, the 663 tip will sit loose in the recess and you want a lower-numbered driver instead.
2) How long is the shank on the Klein Tools 663 square recess screwdriver?
The 663 has a 4-inch round shank. That gives enough reach to get down into recessed screw locations in a panel or enclosure while keeping the driver short enough to control in a crowded box. If you are reaching deep into a tall enclosure, you will want a longer-shank square recess driver.
3) Can I put a wrench on this screwdriver for more torque?
The 663 has a round shank, not a hex bolster, so there is no flat to take an open-end wrench. The description notes the round shank can be gripped with pliers or a nut driver when you need extra leverage. If you want to wrench a square recess driver regularly, look for a model with a square or hex bolster at the base of the shank.
4) Is a dedicated square recess screwdriver worth carrying instead of a multi-bit driver?
A fixed-tip driver like the 663 transfers torque straight through the blade with no bit to slip or wobble in a holder, which matters on square recess fasteners where you are counting on the positive engagement to avoid cam-out. A multi-bit driver covers more fastener types in one tool but adds a joint at the bit. For crews doing panel and enclosure assembly on square-drive screws all day, the single-purpose 663 is the one that stays in the pouch.
How fast can I get the Klein Tools KLN663 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools KLN663 come with a warranty?
Absolutely. The Klein Tools KLN663 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools KLN663?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools KLN663 from ZenSupply?
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