Buying task · Pads and backing plates
Polishing pads and backing plates: sizes and fit
How polishing pads fit backing plates: plate size, pad overhang, throw and what each polisher maker allows, so the pad you order fits the tool you own.
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Short answer
Start from your polisher's backing plate, not from the pad. Find the plate size and the maker's rule for pad size, then buy pads to match: RUPES designs its pads to overhang its plates, while Milwaukee says plate and pad diameters should match.[1][2] Use only plates the tool maker recommends.
Why the plate decides the pad
The backing plate is the disc on the polisher that the pad attaches to, usually by hook-and-loop. Its size sets which pads fit and how they behave, and makers do not agree on one rule:
| Maker and tool | Plate | Pad rule |
|---|---|---|
| RUPES LHR15ES | 125 mm | Foam pads listed at 130-150 mm and wool at 130 mm, so the pad deliberately overhangs[1] |
| Milwaukee 2684-20 and 2685-20 | Matches the pad | Plate diameter should match pad diameter; center the pad for balance[2] |
| RUPES LK900E | 125 or 150 mm | Dedicated plates listed by size[3] |
| FLEX PXE 80 kit 493503 | 30 and 75 mm | FLEX's own interchangeable system[4] |
So pad overhang is a maker choice for a given system, not a general rule. Follow the instructions for the tool you own.
The decisions, in order
1. Plate size. Check what plate your tool ships with. Makita lists the XOP02Z as a 5-inch/6-inch polisher,[5] and Milwaukee's manual shows a backing plate as part of the 2684-20 and 2685-20 but says the polishing pad is not included.[2]
2. Pad size for your throw. Milwaukee lists a 5-inch pad as recommended for its 15 mm 2684-20 (6-inch optional) and a 6-inch pad as recommended for its 21 mm 2685-20 (5-inch optional).[6][7] If you change pad size, change to the matching plate. The 5-inch vs 6-inch guide explains the trade-off.
3. Approved accessories only. Milwaukee's manual says to use only accessories specifically recommended for these polishers, as others may be hazardous.[2] That rules out guessing with an unrelated plate thread or size.
4. Pad material. Foam, microfiber and wool pads differ in how they cut and finish, but we found no maker source we could verify that grades cut levels or colors across brands. Use the pad maker's own description for its range.
Every page in this topic
Guides
- Pad and backing-plate compatibility: what the makers allow
- 5-inch vs 6-inch polisher pads: plate size and throw
Polisher type pages
- 15 mm long-throw and 21 mm long-throw polishers, with their usual pad sizes
- Mini polishers and multi-mode micro polishers with small plates
How the polisher itself moves is covered in the car polishers overview, and small plates in mini polishers for tight areas.
How to choose
- Read your plate size from the tool's manual or the plate itself.
- Apply the tool maker's rule: a matching pad for Milwaukee, the listed pad sizes for RUPES.
- Buy pads from the same system where the maker sells its own.
Next
Everything in this topic
Guides
- 5-inch vs 6-inch polisher padsHelps you choose 5-inch or 6-inch plates and pads to match your polisher's throw and the panels you polish.
- Pad and backing-plate compatibilityHelps you buy plates and pads that fit your polisher by following the tool maker's own rule instead of a universal one.
Common questions
Can I use 6-inch pads on a 15 mm polisher?
On some machines. Milwaukee lists 6-inch as optional for its 15 mm 2684-20, with 5-inch recommended, and says the plate should match the pad diameter. More in 5-inch vs 6-inch polisher pads
Why is my 5-inch pad bigger than 5 inches?
Pads are often named for the plate they fit. RUPES pairs its 125 mm plate with 130-150 mm foam pads, a deliberate overhang. Check your tool maker's rule before mixing brands. More in 5-inch vs 6-inch polisher pads
Is a 6-inch pad faster?
It covers more area per pass on a flat panel, but it reaches curves and recesses less easily. We found no independent measurement of correction speed by pad size. More in 5-inch vs 6-inch polisher pads
Which pad size does a 21 mm polisher use?
Milwaukee lists 6-inch as the recommended pad diameter for its 21 mm 2685-20, with 5-inch optional. More in 5-inch vs 6-inch polisher pads
Should the polishing pad be bigger than the backing plate?
It depends on the maker. Milwaukee says the plate diameter should match the pad diameter, while RUPES pairs its 125 mm plate with 130-150 mm foam pads on purpose. Follow your tool's manual. More in Pad and backing-plate compatibility
Can I use a rotary backing plate on a dual-action polisher?
Only if the maker lists it for both. FLEX, for example, sells separate rotary plates (FT331, FT332) and orbital plates (FT333, FT334) for its 120 V machines. More in Pad and backing-plate compatibility
Does the Milwaukee 2684-20 come with a backing plate?
Milwaukee's manual shows a backing plate as part of the tool and says the polishing pad is not included. Its product pages do not say in text which plate size ships, so check the box. More in Pad and backing-plate compatibility
Are universal backing plates safe?
Milwaukee says to use only accessories specifically recommended for its polishers, because others may be hazardous. Treat a plate that does not name your tool as unverified. More in Pad and backing-plate compatibility
Questions
Should the pad be bigger than the backing plate?
It depends on the maker. RUPES pairs its 125 mm LHR15ES plate with foam pads of 130-150 mm, so the pad overhangs on purpose, while Milwaukee's manual says the plate diameter should match the pad diameter on its polishers.[1][2]
Can I use a 6-inch pad on a 15 mm polisher?
Some makers allow it. Milwaukee lists 5-inch as the recommended pad diameter for its 15 mm 2684-20 and 6-inch as optional, and the reverse for its 21 mm 2685-20. Fit a plate that matches the pad when you change size.[6][7][2]
Are polishing pads included with a polisher?
Often not. Milwaukee's manual shows a backing plate as part of the 2684-20 and 2685-20 and states the polishing pad is not included. Check the box contents of your own tool.[2]
Which pad color is for cutting and which for finishing?
Colors are not a standard across brands, and we found no maker source we could verify for pad cut levels. Use the pad maker's own description for its product line.
Can I use any brand of backing plate on my polisher?
Do not assume so. Milwaukee's manual says to use only accessories specifically recommended for the 2684-20 and 2685-20, as others may be hazardous.[2]