The second 4-inch bolt-on pair here, screws only
A bolt-on PU replacement pair for 4 in hole centers, 10 by 4 in with a 5 7/8 by 1 7/8 in underside cutout, supplied with four screws and nothing else.
Ketofa bolt-on PU replacement arm pads, 4 in spacing
Best for: A 4 in-center chair where you already own a wrench and the washers from the old pads.
This is the other of the two bolt-on pairs on this shelf, and it leads with the right number. The first line of the listing is the hole spacing — 4 in center to center — followed immediately by what it will not fit: 5 in, 5.5 in, and electric wheelchair arms. On a shelf whose buying tip is to measure that one dimension before anything else, a listing that opens with it is doing the reader a favor.
The rest of the fit data is there too. The pad is 10 in long by 4 in wide, and the underside mounting cutout is approximately 5 7/8 by 1 7/8 in, which is the recess that has to clear the bracket on your chair. Left and right pads are supplied as a pair, with four screws, and the construction is PU stated to resist cracking.
Where it differs from its twin is the box. Ketofa includes the screws; the Podoy pair alongside it includes screws, washers and a wrench, and publishes the thread as M6. The two part numbers, 10A0138 and 10U0509, follow the same pattern, the two listings give the same dimensions, and neither mentions the other. If your old fixings survived removal, the hardware difference costs nothing; if they did not, it is the whole difference. And on the day these pages were built, the more complete Podoy box read about $16, a dollar under this one.
Read on the day this page was built: $17 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Best for: A 4 in-center chair where you already own a wrench and the washers from the old pads.
Prices quoted in this text were read on 2026-10-13. The live price is at the top of the page.
No, and the listing says so in its first bullet rather than leaving it to be discovered: "Not compatible with 5" or 5.5" hole spacing or electric wheelchairs." The Podoy pair in this hub also rules out 5 and 5.5 in spacings, but does not mention wheelchairs.
On fit, there is nothing to choose: same 10 by 4 in pad, same 4 in centers, same 5 7/8 by 1 7/8 in cutout, same left-and-right pairing. The difference is the hardware. Ketofa ships two pads and four screws; Podoy ships two pads, four screws, four washers and an installation wrench, and states the thread as M6. The Podoy also reads about a dollar cheaper, $16 against $17, so unless that gap reverses, the more complete box is also the cheaper one.
Memory foam pads with a cooling gel top and a breathable mesh cover, 9.8 by 3 by 1.2 in, held by long velcro straps — at 3 in, the narrowest pad in this hub.
Best for: A narrow armrest, about 3 in across, where a cooler gel surface matters more than height.
A bolt-on replacement for cracked PU arm pads, cut for 4 in center-to-center mounting holes and supplied with M6 screws, washers and the wrench to fit them.
Best for: A chair with 4 in hole centers and arm pads that have cracked through, where covering them up is not the answer.
Memory foam pads that publish what most do not — a thickness, a firmness and the maximum armrest width they fit — with 13 in adjustable straps and a zip-off washable cover.
Best for: A standard task chair with narrow arms, where the pad should be firm enough not to bottom out.
Five plastic-wheeled casters with the standard 7/16 by 7/8 in stem, stated to carry 1,000 lb and to leave hardwood unmarked — in the material this hub’s introduction advises against for hard floors.
Best for: A rug or short carpet, where plastic is the material the shelf would send you to anyway.
Five 2 in rubber casters on standard 11 mm (0.43 in) stems, and the only caster set in this hub to publish its load per wheel rather than a total — the Topdeep base kit is the only other part to give one.
Best for: A chair on a hard floor or low-pile carpet, where the stem has already been measured.
Transparent dual-wheel polyurethane casters with a published noise figure of 28 decibels and a 700 lb rating — the second most modest load claim among the caster sets here, after the Lifelong's 650 lb.
Best for: A shared office or a quiet room, on a chair named in the listing.