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12557840 Engine Harmonic Balancer Bolt for GM Performance Parts, for Most of Gen 3 and Gen 4 LS Engines Crank Bolt, Replaces # 917-139, 1 Pack
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Product details
| Management number | 237310245 | Release Date | 2026/07/10 | List Price | $4.00 | Model Number | 237310245 | ||
|---|---|---|---|---|---|---|---|---|---|
| Category | |||||||||
- Compatiblility: 917-139 harmonic balancer crank bolt for GM engines (4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, L59, L92, L96, L99, LH8,LMG, LMF, LM7, LR4, LMG, LQ4, LQ9, LY5), except LS7/LS9/LT4/LT5.
- Material: LS harmonic balancer bolt replacement made of high-strength steel with precision-engineered threads. Withstands high torque and vibration. Not easy to break or deform.
- Size: Head style is a hex head. 4.55" L x 1.65" W x 0.42" Thread diameter.
- Function: If the balancer bolt slips or becomes loose due to wear and tear at high RPMs, replace it with a new one to prevent damage to the LS engine crankshaft .
- Matched: Specifically designed for most Gen III and Gen IV LS engines. It is a reliable alternative to original LS crank bolts.
| ASIN | B0F5HWZ7DR |
|---|---|
| Brand | AGUNION |
| Color | Silver |
| Model | 12557840 |
| Head Type | Hex |
| Size Name | Standard |
| Metal Type | Alloy Steel |
| Unit Count | 1.0 Count |
| Part Number | 12557840 crank bolt |
| Thread Size | M1.6 x 0.2 |
| Thread Type | Unc |
| Finish Types | Brushed |
| Grade Rating | Class 10.9 |
| Manufacturer | AGUNION |
| Thread Class | 3A |
| Thread Style | Right Hand |
| Fastener Size | M1.6 |
| Fastener Type | Hexagon Bolt |
| Item Diameter | 0.42 Inches |
| Item Hardness | Grade 10.9 |
| Material Type | Alloy Steel |
| Exterior Finish | Brushed |
| Item Dimensions | 1.65 x 0.42 x 4.55 inches |
| Number Of Items | 1 |
| Thread Coverage | Partially Threaded |
| Number of Pieces | 1 |
| Outside Diameter | 0.42 Inches |
| Screw Head Style | Hex Flange |
| Manufacturer Grade | Class 10.9 |
| Included Components | 1 Pack Engine Harmonic Balancer Bolt |
| Warranty Description | 3 Months |
| Compatible Groove Diameter | 0.42 Inches |
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