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ARP 120-2502 Square Drive Harmonic Balancer Bolt

(1977-1985 Buick Regal; 1977-1985 Buick LeSabre; 1977-1981, 1984-1985 Buick Century; 1977-1979 Buick Skylark; 1979-1985 Buick Riviera + 2 more models)

Part of: ARP Square Drive Harmonic Balancer Bolt

Other options in this family: ARP 134-2503 ARP 145-2503 ARP 135-2503 ARP 190-2502 ARP 180-2502

Manufacturer

Picture for manufacturer ARP

Part Number

120-2502
9 reviews
Sale Price

$34.33

3 left at this price

delivery box

Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The ARP 120-2502 is an ultra-strong harmonic balancer bolt engineered to withstand the extreme forces generated as the crankshaft flexes and twists during engine operation. Rated at 200,000 psi tensile strength, this bolt allows maximum clamping force to ensure the balancer remains locked in position under the most demanding conditions.

Key Features:

  • Integrated 1/2-inch square drive forged directly into the bolt head, enabling engine rotation with any standard 1/2-inch drive ratchet or breaker bar
  • Constructed from heat-treated 8740 chrome moly steel for exceptional strength and durability
  • Heavy-duty black oxide finish for corrosion resistance
  • Extra tall 12-point head accepts deep sockets and eliminates stripping concerns
  • Includes 1/4-inch thick, wide area washer for optimal load distribution
  • 200,000 psi tensile strength rating for maximum clamping force

This specialized balancer bolt combines the security of ARP's premium fastener engineering with the convenience of a built-in square drive for easy crankshaft rotation during assembly, timing, and maintenance procedures.

Products specifications

Fits

1977-1985 Buick Regal; 1977-1985 Buick LeSabre; 1977-1981, 1984-1985 Buick Century; 1977-1979 Buick Skylark; 1979-1985 Buick Riviera; 1985 Buick Electra; 1977-1980 Buick Skyhawk

Fastener Finish

Black oxide

Fastener Material

Chromoly

Fastener Yield Strength (psi)

200,000 psi

Head Style

12-point

Notes

13/16 in. socket size.

Quantity

Sold individually.

Thread Size

3/4-16 in.

Underhead Length (in)

1.300 in.

Washer Included

Yes

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