Draper Storm Force® 20V Mid-Torque Impact Wrench, 1/2" Sq. Dr., 400Nm, 1 x 4.0Ah Battery, 1 x Charger

Remove and tighten wheel nuts, suspension fasteners, and high-torque fixings freely and without the restriction of a power cable using the Draper Storm Force® CIW204SF-BMC 20V Mid-Torque Impact Wrench — a capable, well-specified cordless impact wrench that delivers up to 400Nm of torque, five speed settings, and an electric brake in a compact 1.87kg package. Supplied complete with a 4.0Ah battery and 1-hour charger, the CIW204SF-BMC is a complete, ready-to-use cordless impact wrench solution suited to vehicle technicians, mechanics, tyre fitters, maintenance engineers, and serious DIY enthusiasts who need the freedom and convenience of a cordless tool without compromising on torque performance.

At 400Nm of maximum torque with an impact rate of up to 3,200 beats per minute and a no-load speed of 2,300rpm, the CIW204SF-BMC delivers productive, efficient fastener removal and installation across a wide range of automotive and maintenance applications. The 1/2" square drive is the standard size for automotive impact work, giving access to the widest range of compatible impact sockets, extensions, and adaptors — covering wheel nuts, suspension bolts, and structural fixings across the full range of passenger cars, SUVs, and light commercial vehicles.

Five speed settings combined with a variable speed trigger give exceptional control over torque and speed output — from gentle, low-speed tightening for delicate fasteners and torque-sensitive applications through to full-power high-speed removal of seized or heavily corroded nuts and bolts. This level of speed and torque adjustability is a significant practical advantage over single-speed impact wrenches, allowing the CIW204SF-BMC to be used confidently across a far wider range of fastener sizes and tightening requirements without the risk of over-torquing or damaging fixings. Forward and reverse operation with electric brake enables both removal and installation of fasteners, with the electric brake stopping the drive instantly on trigger release for improved safety and precision in confined engine bay and suspension environments.

An integrated LED worklight illuminates the work area directly around the fastener — invaluable when working under vehicles, in wheel arches, and in the poorly lit areas of an engine bay where accurate socket placement is difficult without adequate lighting. A battery level indicator keeps you informed of remaining charge during use, preventing unexpected power loss mid-job. The supplied 1-hour charger ensures the 4.0Ah battery is returned to full charge rapidly between working sessions. As part of the Storm Force® 20V Power Interchange system, the battery is fully compatible with all other Storm Force 20V tools in your toolkit. Not compatible with Draper Storm Force® 10.8V tools.

Key Features

• 400Nm maximum torque for confident removal and installation of wheel nuts and high-torque fasteners
• 5 speed settings with variable speed trigger for precise torque and speed control across all fastener types
• Forward and reverse operation with electric brake for safe, controlled fastener removal and installation
• 1/2" square drive — standard automotive size for maximum socket and accessory compatibility
• Integrated LED worklight for improved visibility in wheel arches, engine bays, and under vehicles
• Battery level indicator to monitor remaining charge during use
• Impact rate of 0–3,200bpm at no-load speed of 0–2,300rpm
• Supplied with 1 x 4.0Ah battery and 1-hour charger — complete ready-to-use kit
• Supplied in a carry case
• Part of the Draper Storm Force® 20V Power Interchange series
• Lightweight at just 1.87kg for comfortable extended use
• Not compatible with Draper Storm Force® 10.8V tools

Specifications

FAQ Section

What is included with the CIW204SF-BMC?
The CIW204SF-BMC is supplied as a complete kit including the impact wrench, one 4.0Ah Storm Force 20V Li-Ion battery, a 1-hour charger, and a carry case — everything needed to get straight to work from the box.

What torque does the CIW204SF-BMC produce?
The CIW204SF-BMC delivers a maximum torque of 400Nm — sufficient for removing and installing wheel nuts, suspension fasteners, and high-torque fixings across the full range of passenger cars, SUVs, and light commercial vehicles encountered in automotive and tyre fitting applications.

How does the 5-speed setting work?
The five speed settings allow you to pre-select the torque and speed output level before pulling the trigger — from low-speed, low-torque settings for delicate or torque-sensitive fasteners through to full-power settings for maximum removal performance on seized or heavily corroded nuts and bolts. The variable speed trigger provides additional fine control within each speed setting, giving a comprehensive range of torque outputs across the full spectrum of fastening applications.

What is the electric brake on the CIW204SF-BMC?
The electric brake applies an instant counter-current to the motor the moment the trigger is released, stopping the drive immediately rather than allowing it to spin down freely. This improves safety when working in confined spaces around suspension components and engine bays, and gives more precise control when positioning the socket onto fasteners — particularly important in the awkward working positions common in automotive applications.

How does the CIW204SF-BMC compare to the corded Draper IW1000D impact wrench?
The CIW204SF-BMC offers the significant practical advantage of cordless freedom — no cable management and unrestricted reach under vehicles and in wheel arches. The corded IW1000D delivers more torque at 480Nm with a full metal gearbox suited to the most demanding professional daily use. The CIW204SF-BMC's 400Nm, 5-speed settings, LED worklight, battery level indicator, and Storm Force 20V Power Interchange compatibility make it the more practical and versatile choice for automotive work where cordless freedom, torque control, and ease of use are priorities.

Is the battery compatible with other Storm Force 20V tools?
Yes. The supplied 4.0Ah battery is part of the Draper Storm Force® 20V Power Interchange system and is fully compatible with all other Storm Force 20V tools in your toolkit — including the RCRS20SF reciprocating saw, CCS20SF circular saw, CAG20SF angle grinder, and CSDS20SF SDS drill. Not compatible with Draper Storm Force® 10.8V tools.

Can I use impact sockets I already own with the CIW204SF-BMC?
Yes, provided they are impact-rated sockets with a 1/2" square drive fitting. Standard chrome vanadium sockets must not be used with any impact wrench — only impact-rated sockets (typically chrome molybdenum with a black oxide finish) are designed to withstand the shock loads generated during impact wrench operation.