Copyright 2012. RacingPartsMaximum. All rights reserved.
Materials
RPM International offers three distinct types of crankshafts—Cast, 4130/5140 Forged with
Nitriding, and the SAE 4340 Forged with Nitriding, which is our top of the line.
SAE Certified 4340 forged material is used for superior strength and its proven performance in the aircraft
and aerospace industries. For increased strength these cranks are given a second heat treatment after rough
finishing and then nitride hardened eliminating any deformation after leaving the factory.
RPM cranks are perfect for the racer who wants a forged unit without the price of a full race crank. These
crankshafts are made from SAE Certified 4130, 4142, or 5140 materials and are nitride hardened for
superior strength. These cranks use the part number prefix DG5 (for example: DG5-182D). Please consult
your price list or the RPM catalog for the most popular street/strip applications.
RPM cast crankshafts are designed as a better than stock nodular iron OE replacement for domestic
applications. Strong castings and a large selection of stroke and rod combinations make these cranks ideal
for the street/strip racer. These crankshafts use part number prefix QT for example QT-039. Please
consult your price list or the RPM catalog for your application.
RPM International offers three distinct types of crankshafts—Cast, 4130/5140 Forged with
Nitriding, and the SAE 4340 Forged with Nitriding, which is our top of the line.
SAE Certified 4340 forged material is used for superior strength and its proven performance in the aircraft
and aerospace industries. For increased strength these cranks are given a second heat treatment after rough
finishing and then nitride hardened eliminating any deformation after leaving the factory.
RPM cranks are perfect for the racer who wants a forged unit without the price of a full race crank. These
crankshafts are made from SAE Certified 4130, 4142, or 5140 materials and are nitride hardened for
superior strength. These cranks use the part number prefix DG5 (for example: DG5-182D). Please consult
your price list or the RPM catalog for the most popular street/strip applications.
RPM cast crankshafts are designed as a better than stock nodular iron OE replacement for domestic
applications. Strong castings and a large selection of stroke and rod combinations make these cranks ideal
for the street/strip racer. These crankshafts use part number prefix QT for example QT-039. Please
consult your price list or the RPM catalog for your application.
| Nodular Iron |
| Forged Steel |
| |||||
MAXX 4340 Forged Crankshafts
Designed for the racer who wants the best!
4340 Forged material for superior strength
.125” radius on all journals
Lightening holes in all rod throws
Shot peened and stress relieved
All forged cranks are nitride hardened
Undercut pendulum counterweights available
Available in various stroke, rod and main configurations
Designed for the racer who wants the best!
4340 Forged material for superior strength
.125” radius on all journals
Lightening holes in all rod throws
Shot peened and stress relieved
All forged cranks are nitride hardened
Undercut pendulum counterweights available
Available in various stroke, rod and main configurations
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