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FAQs

Straight die grinders give the most versatile general-purpose grip — used for the majority of fabrication, weld preparation, and engineering work. The body sits in line with the work and the operator's hand is naturally positioned for steady control. Angle-head (90-degree) die grinders put the burr at right angles to the body — used in confined spaces, port-and-polish work in cylinder heads and ducts, and any job where reach into a corner matters more than direct in-line control. Most workshops have at least one of each.

1/4-inch (6mm) is the workshop standard for general-purpose burrs, mounted points, sanding rolls, and the majority of die-grinder consumables. 1/8-inch (3mm) is for fine-detail work — small mounted points, jewellery-style tools, and precision finishing. For most fabrication and engineering work, a 1/4-inch grinder covers everything. Add a 1/8-inch unit if you do regular fine-detail work. Some die grinders accept a reduction collet to take 1/8-inch tools in a 1/4-inch grinder, but the air consumption and RPM may not match optimally.

Match the compressor's free-air-delivery (FAD) at 90 PSI to the die grinder's rated air consumption, with at least 25-30% margin for duty cycle and air-system losses. A typical 1/4-inch general-purpose die grinder consumes 4-6 CFM continuously; size the compressor to 5-8 CFM minimum. For continuous fabrication use (where the grinder runs for several minutes at a time), prefer belt-drive compressors with 70-80% duty rating — direct-drive units short-cycle on continuous heavy use. The CFM rating is on every die grinder product page.

Three common causes: (1) the air supply line is too small in diameter — for 1/4-inch and 3/8-inch die grinders, use 3/8-inch ID hose minimum, with 1/2-inch ID for runs over 10 metres; smaller hose chokes the airflow even at correct pressure. (2) The in-line oiler or filter-regulator is restricting flow — check the regulator is set to at least 90 PSI at the tool inlet. (3) The compressor's FAD is below the tool's CFM requirement — the gauge shows full pressure but the air can't sustain at flow. Check all three before sending the tool back.

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 Die Grinders

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Within Compressors / Air Tools, Air Die Grinders covers the pneumatic-driven die grinders used in fabrication, weld preparation, mould finishing, port-and-polish work, and any application where a high-speed rotating burr or stone is needed for material removal. Parts For Machines supplies trade-grade air die grinders for workshop and on-site fabrication use. Parts For Machines is an Authorised Distributor and Seller of SIP and Nuair across air die grinders, with SIP and Nuair covering the trade-grade range used in fabrication and engineering shops.

Sealey extends the line with workshop-grade die grinders at competitive trade pricing. Air die grinders come in two main body styles. Straight (pencil-grip) die grinders are used for general burr-and-stone work where the operator grips the body in line with the work.

Angle-head (90-degree) die grinders are used in confined spaces and for working into corners where a straight body can't fit — common in pipe-and-vessel weld preparation and motor-cycle and automotive port-and-polish work. Product pages list rated free speed (in RPM — typically 18,000 to 25,000 RPM for general-purpose grinders, up to 60,000 RPM for high-speed pencil grinders), collet size (typically 1/4-inch or 6mm for general work, smaller 1/8-inch or 3mm for fine detail work), air consumption (in CFM at 90 PSI working pressure), spindle thread, and weight. For fabrication and weld-preparation work, choose 1/4-inch collet die grinders running 20,000-25,000 RPM with carbide burrs — fast material removal at controlled finish. For finishing and detail work, smaller 1/8-inch collet pencil grinders running 50,000+ RPM with mounted points (small abrasive stones on a spindle) deliver fine-detail finishing.

Always size your compressor to deliver the rated CFM at 90 PSI continuously — a 6 CFM die grinder used continuously needs a 7-8 CFM-rated compressor minimum. Replacement collets, spanner sets, and air-line accessories — air chucks, gauges, in-line oilers — are available for the majority of die grinders we sell. Trade pricing on multi-tool kit orders is available; contact the team via WhatsApp 07754288583.

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