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Compact silver steel fold-up hex key set with five blades

Klein Tools

Klein Tools 409-70579 5 Piece SAE Fold-Up Hex Key Set

SKU CH-2FA9-G9PZP MPN 409-70579

Compact fold-up hex key set with heat-treated alloy steel blades for 180-degree straight and 90-degree right-angle access

  • TypeHex Keys & Accessories
  • Heat-treated alloy steel blades resist wear
  • Fold-out notches enable 180 straight and 90 right-angle use
  • Compact five-piece SAE set covers common sizes
  • Lightweight 88 lb design reduces hand fatigue

5 Piece SAE Fold-Up Hex Key Set

The Klein Tools 409-70579 provides five heat-treated alloy steel hex blades in a compact fold-up format. It is designed for technicians and DIY users who need a portable set of SAE keys for common fastening tasks. The fold-out notches allow each blade to lock at 180 degrees for straight access or 90 degrees for right-angle leverage. Silver steel construction resists wear during repeated use.

Fold-Up Design and Angle Constraints

The fold-up mechanism limits each blade to two fixed positions: fully extended at 180 degrees or angled at 90 degrees. Continuous angle adjustment is not possible, so the tool cannot match arbitrary fastener orientations. Blade length is constrained by the handle size, reducing reach in deep recesses compared to individual long-arm keys. The set covers only the five included SAE sizes; additional sizes require a separate purchase.

Highlights

  • Heat-treated alloy steel blades resist wear
  • Fold-out notches enable 180 straight and 90 right-angle use
  • Compact five-piece SAE set covers common sizes
  • Lightweight 88 lb design reduces hand fatigue

Specifications

BrandKlein Tools
TypeHex Keys & Accessories
Shipping weight1.34 kg
Package size254 × 76 × 25 mm

Questions about this item

Which Klein Tools 409-70579 set should I pick for general SAE hex work?

This 5-piece SAE fold-up hex key set covers the common fractional sizes in one compact handle, so you carry fewer loose bits on the job.

What does the 180-degree fold-out mean when I am tightening a bolt?

The blade locks straight at 180 degrees for maximum leverage or at 90 degrees for right-angle access in tight spots.

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