ROUND ALLEN Bolts (no lock)
ROUND ALLEN bolts connect the crank to the bottom bracket during bicycle assembly. They combine an M15x1 thread with a round-head exterior and an internal Allen interface, giving manufacturers a clearly defined bolt setup in either black or silver.
A composite cover ring is also available for all round-head bolts.
Technical Specifications
FAQ
ROUND ALLEN bolts connect the crank to the bottom bracket during bicycle assembly.
ROUND ALLEN bolts use an M15x1 metric thread. The designation indicates a nominal thread diameter of 15 mm and a thread pitch of 1 mm.
ROUND ALLEN bolts have a round-head exterior and an internal Allen interface.
Both variants use the same thread size and bolt design. The Black version is blackened, while the other version is supplied in silver.
Yes, a composite cover ring is available for all round-head bolts.
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Our B2B Process
We work step by step to clarify what fits before it reaches your assembly line.
1. Tell Us What You Need: Share your crankset interface, bottom bracket configuration and application profile. Our experts help define the right bolt variant, including surface finish.
2. Check the Fit in Your System: We review the selected bolt within your crank and bottom bracket interface. This confirms fit and tightening conditions so it integrates smoothly into your assembly process.
3. Produce with Confidence: You receive clear specifications for assembly and production. This keeps variability low and supports consistent results across your series.
