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Vehicle Info NeededARPPART NUMBER: 070-135-2503
Square Drive Balancer Bolt Big Block Chevy 1966-1995 Generation 4 and 5
$3599
Ships on 09/21/2026
Lowest Price GuaranteeBig Block Chevy
- Square Drive Balancer Bolt
- Big Block Chevy
- 1966-1995 Generation 4 and 5
- 1/2"-20 Thread
BB Chevy square drive balancer bolt kit
ARP's Harmonic Damper Bolts safety keep the damper locked into place as the crankshaft flexes and twists and the harmonic damper absorbs incredible amounts of kinetic energy. These damper bolts are ultra strong, 190,000 psi tensile strength that exerts maximum clamping force and are made from heat-treated 8740 chrome moly steel with heavy-duty black oxide finish. Available with a 12-point or square drive head.
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12-Point Bolt: Features a 1/4" thick, wide area washer and an extra tall 12-point head accepts a deep socket and eliminates the worry of stripping the head.
Square Drive Bolt: 1/2" square drive forged into bolt head, accepts a standard 1/2? drive ratchet or breaker bar to facilitate rotating the crank assembly.
Part TypeHarmonic Balancer Bolt
Product LineARP Harmonic Damper Bolts
BrandARP
Package Height0.3
Package Width5.5
Package Length9.4
Weight0.6 PG
Part CategoryPerformance Parts
Washer(S) IncludedYes
Underhead Length1.55 in (39.4 mm)
Fastener Yield Strength (Psi)200,000
QuantitySold individually
Fastener FinishBlack oxide
Washer IncludedYes
Part FitmentSemi Universal
Fastener MaterialChromoly
Head StyleSquare drive
Vendor Part Number135-2503
Package Qty1
Package TypeEA
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