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ARP 129-2503 Harmonic Balancer Bolt
PART#
129-2503 | SKU ARP129-2503
★★★★★
Vehicle Fitment For:
2001-2026 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML/L5P
See full application list below
$23.92
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Description
The ARP 129-2503 Harmonic Balancer Bolt for your GM 6.6L Duramax is optimized for enhanced reliability and increased strength. Each kit includes a Pro Series balancer bolt that is rated at 200,000 psi tensile strength, and 8740 parallel ground washers. ARP bolts are cold forged to ensure molecular integrity, heat treated prior to thread rolling and machining and designed to exceed the OEM fasteners in strength and durability. Optimum design, enhanced reliability and increased strength are the main attributes of ARPs Pro Series balancer bolt kits.
Features:
- Increased Strength
- Increased Reliability
- 200,000 PSI Tensile Strength
Instructions & Tech Info
Installation Info
Reviews For ARP 129-2503
Overall Rating
/5
3 Reviews
Rating Snapshot
3
0
0
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Verified Buyer
Quality you expect
Matt L (New york) | January 13th, 2026
Amazing quality and great peace of mind for these Duramax trucks.
Crank bolt for harmonica balancer
Duramax7 (Tennessee) | March 23rd, 2021
So far so good little bit confused on the packaging where it says to torque it 325 footpounds GM specs are 260 ?
Arp harmonic balancer bolt
2004 duramax (Idaho) | August 31st, 2020
It's an arp bolt
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Frequently Asked Questions
Is this a TTY bolt?
No, the ARP 129-2503 Harmonic Balancer Bolt is not a toque-to-yield bolt.
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Specifications For ARP 129-2503
MPN
129-2503
SKU
ARP129-2503
GTIN
672036046835
ID
26366
Manufacturer Name
ARP
Shipping Weight
1.00 lb.
Shipping Length
4 in.
Shipping Width
6 in.
Shipping Height
2 in.
Fuel Type
Diesel
Prop 65
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
Internal
L27R59
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