Draper Storm Force® 20V Mid-Torque Impact Wrench, 1/2" Sq. Dr., 250Nm (Sold Bare)

Loosen and tighten wheel nuts, automotive fasteners, and structural fixings freely and without the restriction of a power cable using the Draper Storm Force® CIW20SF 20V Mid-Torque Impact Wrench — a compact, lightweight, and capable cordless impact wrench from the Draper Storm Force® 20V Power Interchange series that delivers up to 250Nm of torque in a remarkably light 1.32kg package. Sold bare — without battery or charger — the CIW20SF is the ideal choice for existing Storm Force 20V tool owners who want to add a versatile cordless impact wrench to their automotive or maintenance toolkit without investing in a duplicate power system.

With a maximum torque of 250Nm and an impact rate of up to 3,600 beats per minute at no-load speeds of 0–2,800rpm, the CIW20SF delivers fast, efficient fastener removal and installation across a wide range of passenger car, light van, and general maintenance applications. The 1/2" square drive is the standard automotive size, giving access to the widest range of compatible impact sockets, extensions, and drive adaptors for wheel nuts, suspension fasteners, and general mechanical fixings. Variable speed control allows the torque and speed output to be matched precisely to the fastener size and material — lower settings for smaller, more delicate fasteners and torque-sensitive applications, and higher settings for maximum removal performance on larger or more stubborn fixings.

Forward and reverse operation with electronic brake enables both removal and installation of fasteners, with the drive stopping instantly on trigger release for improved safety and precise socket placement in confined engine bay and suspension environments. The integrated LED worklight illuminates the work area around the fastener directly — essential for working under vehicles, in wheel arches, and in the poorly lit corners of an engine bay where accurate socket placement is otherwise difficult.

At just 1.32kg the CIW20SF is notably lighter than the CIW204SF-BMC — making it the more comfortable choice for sustained use and overhead fastening applications where tool weight directly affects operator fatigue. For applications requiring more torque — particularly on heavier commercial vehicles or more heavily corroded fasteners — the CIW204SF-BMC's 400Nm output is the appropriate step up. As part of the Storm Force® 20V Power Interchange system, the CIW20SF accepts any Storm Force 20V Li-Ion battery. Battery and charger are sold separately. Not compatible with Draper Storm Force® 10.8V tools.

Key Features

• 250Nm maximum torque for confident removal and installation of automotive and maintenance fasteners
• Variable speed trigger for precise torque and speed control across all fastener types and sizes
• 1/2" square drive — standard automotive size for maximum socket and accessory compatibility
• Impact rate of 0–3,600bpm at no-load speed of 0–2,800rpm
• Forward and reverse operation with electronic brake for safe, controlled fastener removal and installation
• Integrated LED worklight for improved visibility in wheel arches, engine bays, and under vehicles
• Part of the Draper Storm Force® 20V Power Interchange series — compatible with all Storm Force 20V batteries
• Exceptionally lightweight at just 1.32kg for comfortable extended and overhead use
• Sold bare — battery and charger available separately
• Not compatible with Draper Storm Force® 10.8V tools

Specifications

FAQ Section

What batteries are compatible with the CIW20SF?
The CIW20SF is compatible with all Draper Storm Force® 20V Li-Ion batteries within the 20V Power Interchange series, including the B202LISF 2.0Ah and B20LISF 4.0Ah batteries. It is not compatible with Draper Storm Force® 10.8V tools. For sustained impact wrench use the 4.0Ah B20LISF is recommended for maximum runtime between charges.

Why is the CIW20SF sold bare?
The CIW20SF is sold without battery or charger to offer the best value for existing Storm Force 20V tool owners who already have compatible batteries and chargers. Batteries and chargers are available separately within the Storm Force 20V range. For a complete ready-to-use kit including battery and charger, the CIW204SF-BMC is available as a bundled option.

How does the CIW20SF differ from the CIW204SF-BMC?
The CIW20SF delivers 250Nm of maximum torque versus the CIW204SF-BMC's 400Nm, and is slightly lighter at 1.32kg versus 1.87kg. Both share the same 1/2" square drive, LED worklight, electronic brake, and forward/reverse operation. The CIW204SF-BMC adds five discrete speed settings and is supplied with a 4.0Ah battery and 1-hour charger as a complete kit. The CIW20SF is the more compact, lightweight choice for everyday automotive work on passenger cars; the CIW204SF-BMC is better suited to heavier fasteners and commercial vehicle applications requiring more torque.

What is the practical torque difference between 250Nm and 400Nm for automotive use?
For most passenger car wheel nut removal and installation, 250Nm is sufficient — the typical OEM wheel nut torque specification for passenger cars falls between 100Nm and 140Nm, well within the CIW20SF's output. The additional torque of the CIW204SF-BMC becomes more relevant for heavily corroded or over-torqued fasteners, larger commercial vehicle wheels, suspension components, and structural fixings where higher removal torque is needed.

Can I use standard chrome sockets with the CIW20SF?
No. Standard chrome vanadium sockets must never be used with an impact wrench. Only impact-rated sockets — typically manufactured from chrome molybdenum steel with a black oxide finish — are designed to handle the shock loads generated during impact wrench operation. Using standard sockets risks cracking or shattering, creating a serious safety hazard.

What does the electronic brake do on the CIW20SF?
The electronic brake applies an instant counter-current to the motor the moment the trigger is released, stopping the drive immediately. This improves safety when positioning the socket onto fasteners in confined wheel arches and engine bays, and reduces the risk of accidental contact with surrounding components after the trigger is released.