Wera Kraftform 27 RA: The Smoothest Fine-Tooth Ratcheting Driver Made
- All-metal fine-tooth ratchet with minimal back-drag that wont spin loose screws out.
- Pop-up bayonet handle holds 6 torsion bits securely so you dont drop them in grass.
- Kraftform ergonomic handle allows max torque transfer without blistering palms.
- Handle bit bayonet release button is stiff when cold or covered in grease.
- Longer overall tool length than stubby drivers for tight engine bays.
The Straight-Shooter Take
If you have ever used a cheap big-box ratcheting screwdriver, you know the frustration of high back-drag. You start turning a machine screw into a tapped hole, and instead of clicking through the backstroke, the tool drags the screw right back out with it. Wera solved that with the Kraftform Kompakt 27 RA. The internal pawl engagement is silky smooth, and the ratchet locks with authority when you need to break loose a stubborn machine bolt.
Fit, Finish & Mechanical Integrity
The handle features Wera's signature Kraftform shape, designed with soft and hard zones that mold to your hand under full grip. A green release collar pops the bit magazine out from the base, revealing six 25mm torsion bits held in snug rubber caddies.
- Ratchet Selector: Smooth knurled collar toggles between clockwise, counter-clockwise, and fixed lock
- Bit Retention: Heavy permanent magnet pulls 1-inch bits firmly into place with zero slop
- Shaft Construction: Chrome-plated matte steel shaft resists rust in humid Texas shop conditions
Real-World Durability Check
- Panel Wiring: Drove dozens of terminal screws inside a generator transfer switch. Zero cam-out on brass lugs.
- Back-Drag Benchmark: Successfully drove loose M4 machine screws into untapped plastic electrical enclosures without the screw backing out during the return stroke.
- Drop Impact: Dropped onto the concrete shop floor from bench height three times; the bit magazine stayed latched and the ratchet mechanism never jammed.
Bottom Line: Keep or Pass?
This is one of those hand tools you buy once and keep in your field bag for decades. It saves your wrist from repetitive strain on long assembly jobs and keeps your most essential bits self-contained.
Shop Benchmarks & Specs
| Gear Tooth Count | 36-Tooth fine gear / 10° return angle |
| Max Hand Torque | 50 Nm (442 in-lbs) mechanical rating |
| Drive Size | 1/4-inch hex with strong magnetic collar |
| Handle Core | Kraftform multi-component anti-roll |