Flex 24V FX1451 Impact Wrench vs Craftsman V20 Brushless RP CMCF921 Impact Wrench
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Quick take: The Craftsman V20 Brushless RP CMCF921 Impact Wrench costs $20 less bare; the Craftsman V20 Brushless RP CMCF921 Impact Wrench is lighter (4 vs 4.2 lbs); they live on different battery platforms (Flex 24V vs Craftsman V20), so the deciding factor is usually which batteries you already own.
| Spec | Flex 24V FX1451 Impact Wrench | Craftsman V20 Brushless RP CMCF921 Impact Wrench |
|---|---|---|
| Price (bare tool) | $169 | $149 |
| Kit Price | — | — |
| Rating | — | — |
| Category | Impact Wrench | Impact Wrench |
| Battery Platform | Flex 24V | Craftsman V20 |
| Voltage | 24V | 20V |
| Motor | Brushless | Brushless |
| Weight | 4.2 lbs (bare) | 4.0 lbs (bare) |
| Released | 2022 | 2022 |
| Fastening Torque | 600 ft-lbs | 275 ft-lbs |
| Anvil | 1/2 in friction ring | 1/2 in hog ring |
| Top Speed | 2,700 RPM | 1,900 RPM |
| Modes | 3 speeds + Bolt Auto Stop and Bolt Removal | 2 modes |
Pros & cons
Flex 24V FX1451 Impact Wrench
- ✓Pro Tool Reviews measured a consistent 414.8 ft-lbs working torque on a 3.5Ah Stacked Lithium pack, at the top of the mid-torque wrenches it had tested.
- ✓600 ft-lbs fastening ties DeWalt's DCF891 for the highest fastening rating here, and its 750 ft-lbs nut-busting trails only the Makita GWT07, DeWalt DCF891 and Metabo HPT WR36DE.
- ✓At 6.3 inches long it's shorter than the Bosch (6.6 in) and Ridgid (6.75 in), which helps behind brake calipers and inside wheel wells.
- ✓The 450 RPM low speed gives real control for starting lug nuts and smaller hardware before stepping up.
- ✓Two automatic modes: one stops at seat to avoid stripping lug studs, the other stops once the nut is loose so it doesn't spin off.
- ✓Street price around $169-$199 bare puts near-flagship torque under most premium-brand mid-torque wrenches.
- ✗4.2 lbs bare (Pro Tool Reviews weighed 4.3) ties the Metabo HPT as the heaviest bare tool here, and it's close to 6 lbs with a Stacked Lithium pack.
- ✗Friction ring only, with no pin-detent version for overhead work where a socket must not drop.
- ✗The Flex 24V lineup is still small and mostly sold at Lowe's, so there are fewer automotive companions like ratchets or die grinders.
- ✗No app connectivity or custom torque presets, only the three fixed speeds and two auto modes.
Craftsman V20 Brushless RP CMCF921 Impact Wrench
- ✓Around $149 bare, the lowest price of any impact wrench here.
- ✓The brushless RP motor claims up to 26% more runtime than Craftsman's brushed tools on the same V20 packs.
- ✓Hog ring anvil allows fast one-handed socket changes when rotating tires or swapping sizes.
- ✓Two mode settings let you drop power for smaller fasteners instead of relying only on trigger feel.
- ✓Runs on any Craftsman V20 battery, which is sold widely at Lowe's and Ace Hardware.
- ✗275 ft-lbs fastening is roughly half what Ridgid, Flex and Metabo HPT claim for their mid-torque wrenches.
- ✗Craftsman publishes no nut-busting torque or impact rate, which makes a like-for-like comparison impossible.
- ✗1,900 RPM top speed is the slowest here, so running long bolts takes longer.
- ✗Craftsman doesn't describe either mode as auto-stop or bolt-release, features the Bosch, Ridgid, Flex and Metabo HPT wrenches all list.
- ✗Only a 3-year limited warranty, against Ridgid's lifetime service agreement, Flex's 5-year and Metabo HPT's lifetime tool warranty.