Klein Tools Folding Hex Key Se...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$69.44
$17.65
Klein Tools Compact Folding Hex Key Set, 12-Key, SAE, Metric Sizes

Klein Tools Folding Hex Key Set 12-Key SAE Metric Sizes Reinforced Nylon Handle CR-V Steel

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Model: 70590
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$69.44
$17.65
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Klein Tools Folding Hex Key Set 12-Key SAE Metric Sizes

Professional-Grade Compact Folding Tool Set

The Klein Tools Folding Hex Key Set delivers professional-grade fastening performance for electrical and mechanical applications. This CR-V steel construction folding set features 12 commonly used SAE and metric hex key sizes in a compact reinforced nylon handle designed for electricians, technicians, and maintenance professionals, providing the reliable performance and industry-leading quality that tradesmen demand from America's most trusted tool manufacturer.

Professional Features & Benefits

Compact Design & Versatility

  • 12 Essential Sizes - Combines six SAE (5/64", 3/32", 7/64", 1/8", 9/64", 5/32") and six metric (1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm) hex keys in one compact tool for maximum convenience
  • High-Leverage Blades - Individual keys open independently up to 270 degrees providing superior access and torque application in tight spaces
  • Square-Cut Ends - Precision-machined ends ensure secure, full-depth fit and maximum contact with fasteners to prevent slippage and stripping
  • Side Access Design - Strategic openings on case sides provide unimpeded access to outer keys without opening the entire set

Durability & Construction

  • Heat-Treated CR-V Steel - Premium chrome vanadium steel construction with black phosphate finish delivers exceptional strength and best-in-class rust prevention
  • Reinforced Nylon Handle - Sturdy, comfortable grip design withstands heavy use while providing secure tool storage and portability
  • Adjustable Tension - Convenient #2 Phillips fastener allows effortless adjustment of key tightness or looseness for optimal operation

Technical Specifications

Overall dimensions: 5.5" length x 1.45" width x 1.6" height, weighing 0.37 lbs. Handle length: 4.38" with reinforced nylon construction. Key lengths range from 2.69" to 3.8". Heat-treated CR-V steel construction with black phosphate finish. Includes 12 hex key sizes: SAE (5/64", 3/32", 7/64", 1/8", 9/64", 5/32") and Metric (1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm). Compact folding design with 270-degree blade opening capability.

Installation & Usage

  1. Select appropriate hex key size by identifying fastener requirements and opening desired blade up to 270 degrees
  2. Insert square-cut end fully into hex socket ensuring complete engagement for maximum torque transfer
  3. Apply steady, controlled pressure while turning to prevent fastener damage and ensure professional results
  4. Utilize high-leverage blade design for increased torque application in confined electrical panel and equipment spaces
  5. Adjust key tension using #2 Phillips fastener as needed for optimal blade retention and smooth operation
  6. Fold unused keys into reinforced nylon handle for compact storage and easy transport between job sites

Professional Applications

Ideal for:

  • Electrical Panel Work - Securing terminal blocks, breaker connections, and control panel assemblies in commercial and industrial installations
  • HVAC Systems - Fastening equipment housings, control boards, and mounting brackets in heating and cooling applications
  • Telecommunications - Installing rack-mounted equipment, cable management systems, and network hardware in data centers
  • Industrial Maintenance - Servicing machinery, motor connections, and equipment housings requiring hex fasteners
  • Residential Wiring - Securing electrical boxes, fixture mounting, and residential panel work requiring compact tool access
  • Commercial Construction - Installing conduit fittings, junction boxes, and electrical equipment in new construction projects
  • Automotive Electrical - Working on vehicle electrical systems, battery connections, and automotive wiring applications
  • Electronic Equipment - Servicing control panels, electronic enclosures, and precision equipment requiring hex fasteners

Folding Design Advantage

Klein Tools' innovative folding hex key design maximizes portability while maintaining professional performance standards. The reinforced nylon handle provides secure storage for all 12 sizes while the high-leverage blade system delivers superior torque application. Square-cut ends ensure precise fastener engagement, while the heat-treated CR-V steel construction guarantees long-lasting durability under demanding electrical and mechanical applications.

Why Choose Klein Tools Quality?

Since 1857, Klein Tools has maintained its commitment to manufacturing America's finest professional tools for electrical tradesmen. This folding hex key set exemplifies Klein's dedication to precision engineering, rigorous testing protocols, and innovative design solutions that enhance productivity and safety for electrical professionals, technicians, and maintenance specialists across all industries.



KLN-70590 - spec sheet

Manufacturer Resources

Product Specs

Application:
Secure Hex Bolt Fastening
Country Of Origin:
Vietnam
End:
Flat
Handle Length:
4.38" (11.1 cm)
Handle Type:
Reinforced Nylon
Included:
(12) SAE and Metric Sized Hex Keys
Key Lengths:
2.69" to 3.8" (6.8 to 9.7 cm)
Measurement Standard:
SAE, Metric
Number Of Pieces:
1
Overall Height:
1.11" (2.8 cm)
Overall Length:
5.5" (14 cm)
Overall Width:
1.05" (2.7 cm)
Product Type:
Folding Set
Department:
Electrical
Product Group:
Hand Tools
Product Subgroup:
Hammers & Wrenches
Product Finish:
Black Phosphate
Product Size:
5/64'', 3/32'', 7/64'', 1/8'', 9/64'', 5/32'', 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm
Product Details:
Folding Set
Product Color:
Orange
Product Height:
1.6000 in
Product Material:
CR-V Steel
Product Weight:
0.3700 lbs
Product Width:
1.4500 in
Product Depth:
4.5600 in

Klein Tools 70590 – Frequently Asked Questions

1) What hex key sizes come in the Klein 70590 folding set?
Twelve keys, six SAE and six metric: 5/64, 3/32, 7/64, 1/8, 9/64 and 5/32 inch, plus 1.5mm, 2mm, 2.5mm, 3mm, 4mm and 5mm. That covers the small-fastener range you hit on terminal blocks, control boards and rack hardware, but it tops out at 5/32 inch and 5mm, so larger set screws and equipment bolts need a separate set.
2) Does one Klein 70590 cover both SAE and metric fasteners, or do I need two tools?
One tool. The 70590 carries both standards in the same handle, six inch-sized keys and six metric, so a tech servicing mixed equipment (imported control gear next to domestic panel hardware) is not carrying two folding sets. It ships as a single piece, one handle with all 12 keys.
3) Will a folding hex key set fit in a pouch or shirt pocket for panel work?
Yes. The Klein 70590 folds to 5.5 inches long by 1.45 inches wide by 1.6 inches high and weighs 0.37 lbs, so it drops into a pouch pocket without snagging. The handle itself is 4.38 inches, which is enough to grip with a gloved hand.
4) Should I buy a folding hex key set or loose L-keys for electrical work?
A folding set like the 70590 keeps all 12 SAE and metric keys captive in one reinforced nylon handle, so nothing gets dropped into a live panel or lost in the truck, and the handle gives you leverage without a second tool. Loose L-keys win when you need to reach deep into a recessed socket or work at a long offset, because the folding keys are limited to 2.69 to 3.8 inches of blade and the handle body has to clear the surface. For most panel, rack and equipment-housing fasteners the folding set is the faster tool.
5) Do the keys get loose and flop open over time?
The pivot tension is adjustable. A #2 Phillips fastener at the hinge tightens or loosens the keys, so when a blade starts swinging free after heavy use you snug it back down instead of replacing the tool. Each key swings independently up to 270 degrees, which also lets you use an opened blade as a lever for extra torque.
6) Are these hex keys ball-end or flat?
Flat, square-cut ends. That means you have to come at the fastener straight on rather than at an angle like a ball-end key, but you get full contact in the socket, which is what you want on soft set screws and painted terminal hardware where a ball end would cam out and round the socket.
7) Will this hex key set rust if it lives in a damp tool bag or service truck?
The blades are heat-treated chrome vanadium steel with a black phosphate finish, which is the corrosion coating used on professional hand tools rather than bare or bright steel. It holds up in a damp bag, though phosphate is a conversion coating, not plating, so wipe it down after standing water or cutting fluid exposure.
8) Can I get to the outermost keys without unfolding the whole set?
Yes. The nylon case has openings cut in the sides so the outer keys swing out directly. On the 70590 that matters when you are one-handed in a panel and only need the 5/64 or the 5mm at either end of the stack.
9) What is the Klein part number and where is this hex key set made?
Klein Tools catalog number 70590, UPC 092644370274. Country of origin is Vietnam. The orange nylon handle is the visual tell if you are matching it to what is already in a crew's bags.
How fast can I get the Klein Tools 70590 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 70590 come with a warranty?
Absolutely. The Klein Tools 70590 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 70590?
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 70590 from ZenSupply?
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