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KRC R-LOK Crankshaft Adapters and Pulleys


KRC
KRC R-LOK Crankshaft Adapters and Pulleys

Product images may differ from actual product appearance.

R-LOK Crankshaft Adapters and Pulleys allow for a modular system in which pulleys can be changed in minutes. More concentric than pin-drive or keyway systems, the unique R-LOK design reduces side loads on damper bolts (a problem on mandrel-type systems). Available for Chevy, Ford, and Dodge, these CNC'd anodized aluminum adapters feature weight reduction pockets that do not affect structural integrity.

The SB-Chevy Pro R-LOK Crank Adapter eliminates the need for a long crank bolt that can potentially break off. A steel tab goes in first with a shorter bolt to fasten the damper to the engine; an R-LOK crank adapter mounts over it; all pulleys are then secured to the adapter with a shorter bolt.

KRC Crank Pulleys are CNC-machined from 6061 billet aluminum to the highest tolerances and SAE specifications. They have weight reduction pockets and are treated to C-70 Rockwell hardness. The serpentine pulleys have 30% more surface area for belt contact than most competitor pulleys.

KRC Crank Spacers provide proper alignment for your application. They fit between an R-LOK crank adapter and an R-LOK crank pulley, resulting in correct alignment of the crank pulley belt and water pump pulley (and/or other pulleys).



22 Products
Adapters

612-40200200
R-LOK Crank Adapter
  • SB-Chevy
  • 1.045"
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  • $42.64
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    612-38140000
    R-LOK Crank Adapter
  • SB-Chevy
  • 1.245"
    More info on KRC 38140000
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  • $44.73
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    612-38140500
    Pro R-LOK Crank Adapter
  • SB-Chevy
  • 1.245"
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  • $82.49
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    612-38130000
    R-LOK Crank Adapter
  • LS1/BB-Chevy
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  • $45.23
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    612-38161000
    R-LOK Crank Adapter
  • Ford 3-bolt
    More info on KRC 38161000
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  • $67.67
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    612-38164000
    R-LOK Crank Adapter
  • Ford 4-bolt
    More info on KRC 38164000
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  • $53.34
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    612-38150000
    R-LOK Crank Adapter
  • SB-Dodge
  • 1.245"
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  • $76.91
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    Pulleys

    612-38225000
    R-LOK Serpentine Crank Pulley
  • 2.5"
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  • $34.72
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    612-38230000
    R-LOK Serpentine Crank Pulley
  • 3"
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  • $44.30
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    612-38232500
    R-LOK Serpentine Crank Pulley
  • 3.25"
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  • $45.62
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    612-38235000
    R-LOK Serpentine Crank Pulley
  • 3.5"
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  • $45.62
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    612-38240000
    R-LOK Serpentine Crank Pulley
  • 4"
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  • $50.49
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    Spacers

    612-38210000
    R-LOK to R-LOK Spacer
  • For stacking serpentine pulleys
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  • $15.98
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    612-38211000
    R-LOK to Pin-Drive Spacer
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    $19.79
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    612-38215200
    R-LOK Crank Spacer
  • .200"
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  • $13.37
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    612-38215250
    R-LOK Crank Spacer
  • .250"
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  • $20.99
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    612-38215375
    R-LOK Crank Spacer
  • .375"
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  • $21.34
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    612-38215575
    R-LOK Crank Spacer
  • .575"
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  • $21.70
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    612-38216000
    R-LOK Crank Spacer
  • 1"
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  • $30.65
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    Accessories

    612-38028000
    R-LOK Mini End Cap
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    $32.99
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    612-38205000
    R-LOK Hex End Cap
  • 1-1/8"
    More info on KRC 38205000
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  • $32.23
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    612-38206000
    R-LOK Smooth End Cap
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    $19.78
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    22 Products