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Segment height is the vertical height of the diamond segment on a sintered cup wheel, measured from the steel core to the cutting face. On 100 to 125 mm wheels common heights run 5 mm to 15 mm, trading abrasive reserve against price, change interval and tool weight.
This guide serves factories, distributors and contractors buying cup wheels for concrete, masonry and stone removal. It covers height versus bond and grit, life in square meters and hours, replacement limits, grinder compatibility and reorder checks.
The segment is the only part that wears; core, bore and braze stay unchanged, so height sets total abrasive reserve from new to scrap. A 15 mm segment holds two to three times the diamond and bond volume of a 5 mm segment, with 7 to 10 mm in between.
Height does not set aggressiveness alone; diamond size, concentration and bond hardness do. A tall hard-bond segment can still glaze, while a short soft-bond segment cuts fast but finishes early. Ordering by height alone means overpaying for unused reserve or underbuying a wheel that reaches the braze mid-job.
The deciding read is base abrasiveness, machine class and work volume. Soft brick, blockwork and limestone wear the bond slowly and need little reserve; hard concrete with flint or quartz aggregate, reinforced sections and precast abrade segments fast and justify a taller block.
Hand-held angle grinders run 6,000 to 11,000 rpm and favor 5 to 7 mm segments: lighter tool, lower lift load, easier edge work. Walk-behind grinders run 300 to 1,500 rpm under 15 to 30 kg of head pressure and carry 10 to 15 mm segments, where a longer change interval matters more than weight.
The table pairs common applications with a height band, grit from the site metal-bond range 16, 20, 30 and 40 grit, and a bond direction. Bond labels are relative: soft bond for hard bases, hard bond for soft bases.
| Application | Typical base | Segment height | Grit and bond |
|---|---|---|---|
| Light dressing, glue removal | Soft concrete, brick, 20–25 MPa | 5–7 mm | 30–40 grit, soft to medium bond |
| Floor levelling, coarse grinding | Medium concrete, 25–35 MPa | 7–10 mm | 20–30 grit, medium bond |
| Heavy grinding, exposed aggregate | Hard concrete, 35–45 MPa, light rebar | 10–12 mm | 16–20 grit, medium to hard bond |
| Long-run production, batch work | Uniform hard base, high daily area | 12–15 mm | 16–20 grit, hard bond, high concentration |
Life is recorded per wheel, not per shipment. On 30 MPa medium concrete a 5 to 7 mm segment typically covers 60 to 100 m², a 7 to 10 mm segment 120 to 200 m², and a 10 to 15 mm segment 180 to 300 m² under normal head pressure. These bands shift with aggregate, pressure and coolant, so they are planning figures, not guarantees.
Track two signals with area: remaining height on a caliper, and cutting feel. Measure a new wheel on day one; normal wear recedes the bond 0.05 to 0.15 mm per 100 m², faster loss means a bond too soft, no loss one too hard. Stop at about 3 mm remaining segment: below that the braze to the core is exposed and segment loss, chipping and kickback risk rise sharply.
Height is one fit factor. Confirm wheel diameter against the guard: common cup wheels are 100, 115, 125 and 180 mm, and the guard opening must match the largest stocked diameter. Check bore and spindle: the standard bore for 100 to 125 mm wheels is 22.23 mm, with M14 or 5/8–11 adapters; the wrong thread or bore leaves the wheel unusable.
Match segment count and pitch to machine rpm. A dense layout on a high-rpm hand grinder traps slurry and loads up; wide pitch on a slow walk-behind head leaves ridges. When in doubt, ask the supplier for the layout matching the target speed range.
Rinse slurry off used wheels and let them dry before stacking; trapped paste hardens on the face and reads as glazing. Store wheels upright or flat in a dry rack, away from 75 to 80% RH condensation zones, so bond and braze are not weakened by damp cycles. Keep a short wear log per batch: start height, finished area, grinder hours and fault note.
Three faults are misread as short life. Glazing, a smooth reflective face that stops cutting, comes from a bond too hard for the base and is fixed by changing bond grade, not buying a taller wheel. Pull-out, missing diamond pockets, means the bond is too soft or concentration is low. Uneven wear points to flange runout, an uneven backer or side pressure rather than height shortage.
Before selecting height, line up four facts: base compressive strength in the 20 to 45 MPa range, aggregate abrasiveness, machine class and rpm band, and planned daily area. Soft base plus hand grinder points to 5 to 7 mm; medium floor work to 7 to 10 mm; hard abrasive or long-run production to 10 to 15 mm.
Confirm grit follows the site sequence 16, 20, 30, 40 for coarse metal-bond work, that bore and thread match the grinder, and that the 3 mm remaining-height limit reaches the operator on the job sheet. A wheel chosen on these checks gives predictable life per m², fewer mid-job stops and a stock line that turns without tying up capital in unused reserve.
Written and reviewed by JOY TECH — an SGS & BV audited, CE/RoHS certified diamond tools manufacturer founded in 2004, exporting to 50+ countries.
Our factory and QMS are audited by SGS and Bureau Veritas. Products meet CE/RoHS requirements and every piece is 100% inspected before packing.
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