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FAQs

Maximum torque in Nm is the headline loosening force — match it to the heaviest fastener you work on, with margin for corroded fixings. CFM is the air the gun draws; your compressor must supply it continuously or the gun underperforms. Free speed in RPM matters for run-down speed once the fastener is loose.

Match drive to fastener duty. 1/2-inch is the workshop and tyre-bay standard covering wheel nuts and suspension work. 3/8-inch suits tighter access and smaller fasteners, 1/4-inch is for light fastening, and 3/4-inch and above handle the high-torque fastening on trucks, plant and agricultural equipment.

No — chrome hand sockets can crack and shatter under impact loading. Use impact sockets, which are made from softer, tougher steel with thicker walls, usually black-phosphate finished. They're listed as compatible accessories against the guns here, in the same drive sizes.

Continuous CFM at the gun's rated pressure, typically 6.2–10 bar (90–145 PSI), through an adequate hose bore and coupling — a long, narrow hose strangles a powerful gun. Clean, lubricated air matters too: an inline filter and oiler protect the motor, and the couplings, hoses and oilers are listed in the same air tools section.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Air Impact Wrenches

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Air impact wrenches are the fastening workhorse of the tyre bay and the workshop: compressed-air guns that spin wheel nuts, suspension bolts and driveline fasteners off in seconds. PartsForMachines supplies the range to the trade as an Authorised Distributor and Seller for Chicago Pneumatic, alongside Sealey, SIP and PCL air tools, across the 1/4, 3/8, 1/2 and 3/4-inch drive sizes that cover car, van, plant and commercial work.

Drive size is the first split: 1/2-inch is the general workshop and tyre standard, 3/8-inch suits tighter access and lighter fasteners, and 3/4-inch upwards handles commercial, agricultural and plant fastening. The Chicago Pneumatic CP7755 1/2-inch is the premium workshop standard for tyre and general fastening, with the CP724H 3/8-inch running a heavy-duty rocking-dog clutch in oil bath with a built-in power regulator, and the wider CP family covering the full drive range alongside the Sealey and SIP equivalents.

The working numbers sit on every product page: maximum torque in Nm (match it to the heaviest fastener, with margin), working torque range, air consumption in CFM (the compressor must supply it — an undersized compressor strangles the gun), free speed, and weight. Compare lines candidate guns up side by side, similar models from other brands appear on each listing, and impact sockets — the only sockets that should ever go on an impact gun — are listed as compatible accessories.

Air tools live or die on clean, lubricated air, so couplings, hoses, filters and inline oilers from PCL and the air-line range sit in the same section. For torque or air-supply questions, use Ask Simon on the product page, or contact the team via WhatsApp 07754288583 for workshop fit-outs.

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