FSA Alloy NBD Bolt Assembly
FSA

FSA Alloy NBD Bolt Assembly

$18.00
In Stock

Direct replacement QR-17 bolt for FSA 24mm-spindle NBD cranks. CNC alloy, black anodized finish and self-extracting design for fast, reliable crank removal.

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Product Details

Overview & Technology

The FSA Alloy NBD Bolt Assembly (Mfg. PN: 390-2001, Prod. No: 350534) is a purpose-built replacement bolt for 24mm spindle NBD cranks that use a no-pinch-bolt interface. Built around a QR-17 self-extracting design, this assembly simplifies crank removal and reinstallation while preserving the clean, tool-friendly styling of modern hollow spindle systems. Machined from a heat-treated aluminium alloy and finished in a hard black anodize, the bolt balances low weight with corrosive resistance and long-term durability. The self-extracting mechanism lets the bolt act as its own crank puller, reducing the number of tools you need on the workstand or trailside.

Key Features & Benefits

CNC-machined aluminium construction: High-strength alloy delivers a best-in-class strength-to-weight ratio and resists deformation under repeated torque cycles. The hard-anodized black finish minimizes corrosion and keeps the bolt looking sharp with alloy or black crank arms. QR-17 self-extracting design: Integrates the crank removal function into the bolt head so you can remove crank arms without a separate puller. This saves time during maintenance and reduces the chance of damaging splines or threads. • Exact replacement for FSA part #390-2001 / product 350534. • Optimized for 24mm spindle NBD cranksets (no pinch bolt). • Lightweight — small package and minimal added mass.

Fit, Compatibility & Installation

This bolt is intended specifically for FSA NBD-style crank arms that accept a 24mm spindle and use the no-pinch-bolt interface. It is not compatible with cranksets that rely on external pinch bolts or with spindle diameters other than 24mm. If your crank originally shipped with a QR-17 self-extracting bolt, this is the direct replacement. Installation is straightforward: thread the bolt into the crank arm and tighten to the manufacturer's recommended torque. The self-extracting cap performs the crank-arm removal when backed out. Always verify compatibility with your crank manual and inspect mating surfaces for wear before installation.

Who This Is For

This replacement bolt is ideal for riders and mechanics who own FSA NBD cranksets with a 24mm spindle and need a reliable spare or replacement. It suits road and performance riders who value low weight and neat aesthetics, home mechanics who want to avoid carrying a crank puller, and bike shops replacing lost or damaged bolts. If you run non-FSA cranks, a different spindle diameter, or a pinch-bolt system, choose a bolt specifically matched to your crank's interface instead of this NBD assembly.

Key Features

  • ✓ QR-17 self-extracting design for tool-free crank arm removal
  • ✓ CNC-machined 6061-T6 aluminium alloy for strength and lightness
  • ✓ Hard black anodized finish resists corrosion and wear
  • ✓ Designed for 24mm spindle NBD cranksets (no pinch bolt)
  • ✓ Direct replacement for FSA part #390-2001 (product 350534)
  • ✓ Compact, lightweight unit — minimal added rotating mass
  • ✓ Simple install with common crank tools and clear fitment

Specifications

Misc Black

Product Identifiers

Vendor Item # 390-2001
UPC 400310069542

Frequently Asked Questions

Will this bolt fit my non-FSA crankset?

This bolt is engineered for FSA NBD-style crank arms that use a 24mm spindle and a no-pinch-bolt interface. It may physically thread into other cranks with the same spindle diameter, but compatibility with the self-extracting cap and head profile is not guaranteed. Always check your crank manufacturer's specifications before purchasing.

What tools do I need to install or remove this bolt?

Installation and removal typically require a standard hex driver or socket that matches the bolt head — check your crank's manual for the exact driver size. The QR-17 self-extracting cap eliminates the need for a separate crank puller when removing the arm, but you'll still need a torque wrench to tighten to the recommended specification.

Is the bolt corrosion-resistant for winter riding?

Yes — the bolt features a hard black anodized finish that improves surface hardness and corrosion resistance compared with raw aluminium. Regular cleaning and mild lubrication of mating surfaces will further extend life in wet or salted-road conditions.

What torque should I use when tightening this bolt?

Follow the torque specification published by your crank manufacturer for 24mm spindle bolts. If you no longer have the manual, consult FSA documentation or your local bike shop — proper torque is critical to prevent loosening or damage to the crank interface.

Does this bolt include the self-extracting cap?

The available variant listed is the QR-17 self-extracting bolt for 24mm Alloy NBD cranks, which includes the self-extracting mechanism as part of the assembly. Confirm the variant when ordering to ensure you receive the QR-17 configuration.

How can I tell if my crank uses a 24mm spindle?

Check your crankset's technical specifications or the original product documentation — 24mm spindles are common on many road and older alloy crank systems. If in doubt, remove the crank arm and measure the spindle diameter or consult a shop for a quick compatibility check.

Buying Guide

When replacing crank arm bolts, match three things: spindle diameter, crank interface type (no-pinch vs pinch-bolt), and self-extracting vs standard bolt head. Measure or check your crank documentation first — using the correct bolt prevents damage to expensive cranksets and ensures reliable engagement between the crank arm and spindle. Choose a bolt material and finish based on your riding conditions. Aluminium alloy bolts like the FSA Alloy NBD provide excellent strength-to-weight and a neat anodized appearance. If you ride in corrosive conditions, pair the bolt with regular maintenance and appropriate lubrication on the threads and mating surfaces.

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