Martin 3V · D-5
8 3V 690 SK
Exact Stock QD Hi-Cap wedge sheave identity and geometry from Martin's official sheave catalog.
Published catalog evidence
Exact manufacturer record
- Catalog number
- 8 3V 690 SK
- Belt section
- 3V
- Number of grooves
- 8
- Pitch diameter
- 6.9"
- Outside diameter
- 6.9"
- QD bushing
- SK
- Catalog page
- D-5
- Published row text
- 8 3V 690 SK 6 .90 6 .90 A-2 SK 2 .625 0 .625 1 .3125 1 .815 0 .9688 14 .0 10 3V 690 SK A-2 SK 2 .625 0 .75 1 .4375 1 .815 1 .6563 16 .0
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 · 8 grooves8 3V 650 SK6.5" PD · QD SK3V · 8 grooves8 3V 600 SK6" PD · QD SK3V · 8 grooves8 3V 800 SF8" PD · QD SF3V · 8 grooves8 3V 560 SK5.6" PD · QD SK3V · 8 grooves8 3V 530 SK5.3" PD · QD SK3V · 8 grooves8 3V 500 SK5" PD · QD SK3V · 8 grooves8 3V 475 SK4.75" PD · QD SK3V · 8 grooves8 3V 1060 SF10.6" PD · QD SF