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    Abrasive Discs
    1. Home
    2. Abrasives
    3. Abrasive Discs
    Item # FJ578355 • Mfr # 578355

    Festool Granat Hook & Loop Sanding Disc 5" 400 Grit Hardened Aluminum Oxide Paper Backed 9 Hole 50 Discs-Box 578355

    Description

    Festool Granat 5 Inch Sanding Disc For Fine Work

    Festool Granat 5 inch sanding disc is a paper backed abrasive disc using hardened aluminum oxide, so it cuts effectively while maintaining an even scratch pattern on the surface. The disc is 400 grit, which supports fine sanding where a smoother finish is required before further coats or polishing. A 9-hole pattern and hook and loop backing provide an interface for dust extraction and quick disc changes, which helps keep the work area cleaner and supports consistent cutting. The abrasive is closed coated, meaning the grain coverage on the surface is dense, so the disc engages the material across more of its face with each pass. The disc is part of the Festool Granat line, which is described as long-lasting and high performing for nearly all applications listed.

    Key Granat Disc Details That Help On The Job

    • This Festool Granat disc uses hardened aluminum oxide on a paper backing, so the abrasive surface maintains cutting performance across a range of woodworking and finishing tasks.
    • The 400 grit rating supports fine sanding steps, so surfaces can be prepared for subsequent coats or finishing processes where a refined scratch pattern is important.
    • The 5 inch diameter disc size matches sanders designed for that pad size, so the abrasive area covers typical woodworking panels and parts efficiently in each pass.
    • The hook and loop backing allows quick disc changes on compatible pads, so grit changes or disc replacement fit into normal sanding workflow without extended downtime.
    • The 9-hole design is intended to align with matching hole-pattern backing pads, so dust extraction can occur through the disc during sanding when connected to a dust collection system.
    • The closed coated construction provides dense grain coverage across the disc face, so contact with the workpiece remains consistent over the sanding area.

    Installation And Disc Mounting For Sanding Workflow

    This Festool Granat 5 inch 400 grit disc uses a hook and loop interface, so it attaches to compatible hook and loop sander backing pads by pressing the disc onto the pad surface. The 9-hole pattern is arranged for pads with a corresponding layout, so when the disc is aligned to those holes, air and dust can travel through during sanding. The paper backed construction supports normal orbital or random-orbit sanding operations where the disc is held flat on the work surface. As part of the Granat abrasive line, the disc is suited for repeatedly mounting and removing from hook and loop pads through typical sanding sequences.

    Using This Granat Disc Across Common Materials

    Applications For Wood, Coatings, And Composites

    This Festool Granat abrasive disc is described as well suited for nearly all applications listed, including bare wood, so it can be used for fine sanding passes on raw stock in preparation for coatings. The same disc is indicated for paints and most modern paint systems, so it can refine painted surfaces between coats where controlled material removal helps leveling. It is also suited for VOC clear coats, which means the abrasive can be used in finishing systems using those clear coatings. The disc works on plastic materials and acrylics, so finer shaping or surface refinement of those substrates can be handled with the same 400 grit. It is also suited for solid surface materials and composites, allowing one disc type to be used across different shop materials where those substrates appear together in projects.

    Granat Construction For Consistent Surface Results

    This Granat disc combines hardened aluminum oxide grain with a synthetic resin bond, so the abrasive particles are held to the paper backing in a way that supports sustained cutting during repeated passes. The closed coated layout places grain densely across the surface, so the working face contacts the material more continuously, helping to produce a uniform scratch pattern. The 400 grit level provides a fine cut, so after coarser grits the surface can be brought closer to a finish-ready state while still allowing controlled sanding. The hook and loop backing works together with these features by allowing quick changes to other Granat grits, so sanding sequences can progress from shaping to finishing using related abrasives. This disc is identified under Festool Granat and manufacturer part number 578355, so it aligns with that specific abrasive system when selecting discs for repeatable shop standards.

    Common Questions About Festool Granat 400 Grit Disc

    What materials can this Festool Granat 400 grit disc sand?

    This Festool Granat disc is well suited for bare wood, paints, most modern paint systems, VOC clear coats, plastic materials, solid surface materials, acrylics, and composites, so one abrasive can cover many typical shop substrates.

    How does the 400 grit rating affect sanding results?

    The 400 grit rating provides fine sanding, so it refines the surface after coarser grits and prepares it for further finishing or coating steps where a smoother base is needed.

    What is the benefit of the 9-hole hook and loop design?

    The 9-hole hook and loop design allows attachment to matching pads and supports dust extraction through the disc, so sanding can proceed with improved debris removal and quick disc changes.

    Why is hardened aluminum oxide used on this Granat disc?

    Hardened aluminum oxide is used as the abrasive grain, so the disc maintains cutting performance across different applications while delivering a consistent scratch pattern.

    How does closed coated construction affect sanding performance?

    The closed coated construction places abrasive grain densely across the disc surface, so a larger portion of the face contacts the material, helping create even sanding results.

    What is the role of the synthetic resin bond on this disc?

    The synthetic resin bond secures the hardened aluminum oxide to the paper backing, so the abrasive layer stays in place during normal sanding and supports the disc's performance over its life.

    Selecting This Granat Disc For Multi-Material Sanding

    This Festool Granat 5 inch 400 grit hook and loop 9-hole disc brings hardened aluminum oxide, synthetic resin bonding, and closed coated construction together in one abrasive. It is described as Festool's most long-lasting and highest performing abrasive and is well suited for nearly all applications listed, including bare wood, paints, most modern paint systems, VOC clear coats, plastic materials, solid surface materials, acrylics, and composites. For work that moves between wood, coated surfaces, and man-made materials, this disc supports a consistent sanding approach using a single specified abrasive line.

    Diameter (in)
    5 in
    Diameter (mm)
    125 mm
    Attachment Type
    Hook and loop
    Grit
    400
    Hole Pattern
    9-hole
    Mineral
    Hardened aluminum oxide
    Product Type
    Sanding Discs
    Vacuum Type
    Vacuum
    Backing Weight
    Paper Backed
    Manufacturer Series
    Granat
    Supplier Pack Size
    1
    Sold In
    1
    Diameter (in)
    5 in
    Diameter (mm)
    125 mm
    Attachment Type
    Hook and loop
    Grit
    400
    Hole Pattern
    9-hole
    Mineral
    Hardened aluminum oxide
    Product Type
    Sanding Discs
    Vacuum Type
    Vacuum
    Backing Weight
    Paper Backed
    Manufacturer Series
    Granat
    Supplier Pack Size
    1
    Sold In
    1
    12015022018080040320400240500601,000801001,2001,500
    Festool
    $40.00/Box
    Festool Granat Hook & Loop Sanding Disc 5" 400 Grit Hardened Aluminum Oxide Paper Backed 9 Hole 50 Discs-Box 578355
    Item# FJ578355 / MFR Part # 578355
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