Klein Tools Pro Folding Hex Ke...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$87.37
$49.39
Klein Tools 70550M Pro Folding Hex Key Set, 10-Key, Metric Sizes

Klein Tools Pro Folding Hex Key Set 10-Piece Metric 1.5-12mm with Extended Reach Blades

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Model: 70550M
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$87.37
$49.39
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Klein Tools Pro Folding Hex Key Set 10-Piece Metric 1.5-12mm with Extended Reach Blades

Professional-grade folding hex key set with extended reach and reinforced construction

The Klein Tools Pro Folding Hex Key Set delivers professional performance with 10 metric-sized keys ranging from 1.5mm to 12mm. Featuring heat-treated CR-V steel construction with black phosphate coating and a reinforced nylon handle, this folding set provides reliable fastening solutions for secure hex bolt applications. Extended-reach blades measuring 3.5" to 4.5" long offer superior access in tight spaces while maintaining the compact folding design professionals demand.

Professional Features & Benefits

  • 10 Metric Key Sizes (1.5-12mm): Complete range covers most common metric hex fasteners for versatile professional applications
  • Extended Reach Blades (3.5"-4.5"): Longer blade length provides better access to recessed fasteners and tight spaces
  • Heat-Treated CR-V Steel Construction: Industrial-strength alloy steel delivers maximum durability and resistance to wear under heavy use
  • Black Phosphate Coating: Corrosion-resistant finish prevents rust and extends tool life in demanding environments
  • Reinforced Nylon Handle: Sturdy, comfortable grip design withstands professional use while providing secure control
  • 270-Degree Independent Opening: High-leverage blade positioning allows optimal working angles and maximum torque application
  • Square-Cut Hex Ends: Precision-cut ends ensure full-depth socket contact to prevent slippage and fastener stripping

Technical Specifications

  • Application: Secure Hex Bolt Fastening
  • Country Of Origin: Vietnam
  • Depth: 6.6300 in
  • End: Flat
  • Handle Length: 6.63" (16.9 cm)
  • Handle Type: Reinforced Nylon
  • Included: (10) Metric-Sized Keys
  • Key Lengths: 3.5" to 4.5" (8.9 to11.4 cm)
  • Measurement Standard: Metric
  • Number Of Pieces: 1
  • Overall Height: 2.15" (6.4 cm)
  • Overall Length: 6.6" (16.8 cm)
  • Overall Width: 1.36" (3.5 cm)
  • Product Color: Orange
  • Product Finish: Black Phosphate
  • Product Height: 1.3700 in
  • Product Material: CR-V Steel
  • Product Size: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm
  • Product Type: Folding Set
  • Product Weight: 1.0100 lbs
  • Product Width: 2.1000 in

Installation & Operation

  1. Select the appropriate metric hex key size for your fastener application from the 10 available sizes.
  2. Open the desired key independently up to 270 degrees for optimal working angle and leverage.
  3. Insert the square-cut hex end fully into the fastener socket for maximum contact and secure engagement.
  4. Apply steady torque while maintaining proper alignment to prevent slippage and fastener damage.
  5. Adjust key tightness or looseness as needed using the convenient #2 Phillips fastener on the handle.
  6. Fold keys back into the reinforced nylon handle for compact storage and transport between jobs.

Professional Applications

  • Automotive Maintenance and Repair
  • Mechanical Assembly and Service
  • Industrial Equipment Maintenance
  • Electronics and Precision Instrument Work
  • HVAC System Installation and Service
  • General Construction and Building Trades
  • Machinery and Equipment Assembly

Why Choose Klein Tools Quality?

Klein Tools delivers professional-grade reliability with heat-treated CR-V steel construction and black phosphate coating for long-lasting performance. The reinforced nylon handle and precision square-cut ends demonstrate Klein Tools' commitment to durability and functionality that professionals trust for secure hex bolt fastening applications.

Manufacturer Resources

Spec Sheet

Product Specs

Application:
Secure Hex Bolt Fastening
Country Of Origin:
Vietnam
End:
Flat
Handle Length:
6.63" (16.9 cm)
Handle Type:
Reinforced Nylon
Included:
(10) Metric-Sized Keys
Key Lengths:
3.5" to 4.5" (8.9 to11.4 cm)
Measurement Standard:
Metric
Number Of Pieces:
1
Overall Height:
2.15" (6.4 cm)
Overall Length:
6.6" (16.8 cm)
Overall Width:
1.36" (3.5 cm)
Product Color:
Orange
Product Finish:
Black Phosphate
Product Height:
1.3700 in
Product Material:
CR-V Steel
Product Type:
Folding Set
Product Weight:
1.0100 lbs
Product Width:
2.1000 in
Product Depth:
6.6300 in
Department:
Electrical
Product Group:
Hand Tools
Product Subgroup:
Hammers & Wrenches

Klein Tools 70550M – Frequently Asked Questions

1) What hex sizes come in the Klein Tools 70550M folding hex key set?
Ten metric keys: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm and 12mm. It's metric only, so if your fasteners are SAE/inch hex you need a separate fractional set. That range covers small electronics screws at the 1.5mm end up through 12mm machine and equipment bolts.
2) Will a folding hex key set reach a recessed set screw, or do I need loose L-keys?
Blades on the 70550M run 3.5 to 4.5 inches long, which is longer than typical folding sets and gets into recessed and counterbored fasteners. The limit is the handle itself: at 6.63 inches long and 1.36 inches wide it needs clearance to swing. For a screw down a deep narrow bore or behind an obstruction, a loose long-arm ball-end L-key still wins. For panel work, HVAC units, and equipment covers, the folding set does the job and keeps all ten sizes on one tool.
3) Are the hex ends ball-end or straight cut on this Klein folding set?
Flat, square-cut ends, not ball ends. Square ends sit at full depth in the socket with maximum face contact, which is what you want on a tight or seized fastener where a ball end would cam out and round the socket. The trade-off is no angled entry, so you have to come at the fastener straight on.
4) Can I tighten the keys up if they start flopping open on their own?
Yes. There's a #2 Phillips fastener on the handle that adjusts blade tension, so you can snug the pivot back up as the set wears in. Each blade also swings independently up to 270 degrees, so you can set one key out at whatever angle gives you leverage without the others in the way.
5) Is this hex key set tough enough for daily service work, or is it a homeowner tool?
It's built for trade use: heat-treated CR-V (chrome vanadium) steel blades with a black phosphate finish for corrosion resistance, in a reinforced nylon handle. The phosphate coating matters if the set lives in a van or a damp mechanical room. Klein lists it for automotive, industrial equipment maintenance, HVAC, and general construction work.
6) Will this fit in a tool pouch or a tech's shirt pocket?
Folded, the set measures 6.6 inches long, 2.15 inches high and 1.36 inches wide and weighs about 1.01 lbs. That drops into a pouch or a bag pocket easily. It's a bit long and heavy for a shirt pocket, so think tool bag or belt pouch rather than pocket carry.
7) What part number do I order, and is it easy to spot in a shared tool crib?
Order Klein Tools 70550M. The handle is orange, which makes it quick to pick out of a bag or off a bench, and the M in the model number is the metric designation. It ships as a single assembled unit with all ten keys in the handle, nothing to assemble.
How fast can I get the Klein Tools 70550M 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 70550M come with a warranty?
Absolutely. The Klein Tools 70550M 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 70550M?
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 70550M from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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