Martin 3V · D-4
3 3V 280 JA
Exact Stock QD Hi-Cap wedge sheave identity and geometry from Martin's official sheave catalog.
Published catalog evidence
Exact manufacturer record
- Catalog number
- 3 3V 280 JA
- Belt section
- 3V
- Number of grooves
- 3
- Pitch diameter
- 2.8"
- Outside diameter
- 2.8"
- QD bushing
- JA
- Catalog page
- D-4
- Published row text
- 3 3V 280 JA 2 .80 2 .80 D-1 JA 1 .25 0 .375 0 .125 1 0 .8125 2 .0 4 3V 280 JA D-1 JA 1 .250 0 .375 0 .125 1 1 .2188 1 .6
Verification boundary
What still needs to match
Belt and groovesConfirm the exact 3V, 5V, or 8V belt section, groove count, belt construction, and matched-set requirements.
Bushing and shaftVerify the QD bushing size, finished bore, shaft diameter, key/keyway, bushing orientation, and installation torque.
GeometryConfirm pitch diameter, outside diameter, sheave width, hub projection, guard clearance, and center-distance constraints.
Drive dutyCheck motor speed, sheave RPM, horsepower, service factor, belt speed, alignment, balance, environmental limits, and current manufacturer ratings.
Related catalog sheaves
Same section and groove count
3V · 3 grooves3 3V 265 JA2.65" PD · QD JA3V · 3 grooves3 3V 300 SH3" PD · QD SH3V · 3 grooves3 3V 250 JA2.5" PD · QD JA3V · 3 grooves3 3V 315 SH3.15" PD · QD SH3V · 3 grooves3 3V 335 SH3.35" PD · QD SH3V · 3 grooves3 3V 365 SH3.65" PD · QD SH3V · 3 grooves3 3V 412 SH4.12" PD · QD SH3V · 3 grooves3 3V 450 SDS4.5" PD · QD SDS