STONE CrMo Steel Chainring Bolts M8: 5-Piece Set for Road and MTB Cranksets in 7.5, 8.5 and 10.5 mm Nut Heights
Product Specifications
- Brand: STONE
- Product: Chainring bolts
- Application: Road bike / mountain bike
- Material: CrMo steel
- Thread size: M8
- Diameter: 10 mm
- Color: Black / Silver
- Available models: 7.5 mm / 8.5 mm / 10.5 mm (nut height)
- Installation torque: 11–12 Nm
- Installation tool: 5 mm hex wrench
- Package: 5 pcs chainring bolts
Color, Size & Weight
Each color option is offered in different nut heights, with surface treatment and weight varying by model.
Black
- Available sizes: 7.5 mm / 8.5 mm
- Surface treatment: Black electrophoresis
- Approx. weight: 4.7 g / 4.9 g per 5 pcs
Silver
- Available sizes: 7.5 mm / 8.5 mm / 10.5 mm
- Surface treatment: Nickel plating
- Approx. weight: 4.4 g / 5.0 g / 6.3 g per 5 pcs
Size Definition
The model name refers to the nut height of the bolt. Choose the size based on your chainring and crankset configuration.
7.5 mm — for single chainring
- Clamping distance: 6–8 mm
- For clamped product thickness: > 6.5 mm
8.5 mm — for double chainring
- Clamping distance: 7–9 mm
- For clamped product thickness: > 7.5 mm
10.5 mm — for chainring guard
- Clamping distance: 9–11 mm
- For clamped product thickness: > 9.5 mm
Features
- Strong CrMo steel construction: Stronger and more durable than aluminum alloy chainring bolts, suitable for road bikes, mountain bikes, and high-load riding.
- Durable surface treatment: Black electrophoresis or silver nickel plating improves wear resistance, corrosion resistance, and long-term color stability.
- High-precision inner hex socket: Provides better tool engagement and helps reduce the risk of slipping or rounding during installation.
- Reliable torque performance: Supports installation torque up to 16 Nm under proper installation conditions.
- Easy installation: Requires a chainring nut tool and a 5 mm Allen wrench for the inner hex socket.
- First installation note for the 8.5 mm spec: Due to the protective surface coating, the thread may feel slightly tight during the first installation. This is normal and will become smoother after the initial installation.
Important Notes
- Please choose the correct specification according to your chainring and crankset thickness.
- The specification name refers to the nut height, not the total bolt length.
- Different chainring and crank setups may require different bolt lengths.
- Do not force installation if the bolt length is not suitable.
- Manual measurement may result in slight size deviation.
Package Includes
- 5 pcs STONE steel chainring bolts
Questions & Answers
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