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Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair
Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair - Image 2
Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair - Image 3
Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair - Image 4
Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair - Image 5
Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair - Image 6

Bafang G521 (M600) G510 (M620) Crankset Nut, Steel Chainwheel Fixing Nut for Bafang Mid‑Drive Motor Ebike Repair

Bafang G521(M600) G510(M620) crankset nut, heavy‑duty steel chainwheel fixing nut for Bafang mid‑drive motor. Replacement part for ebike mid motor crankset and chainring mounting repair.

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Bafang G521(M600) G510(M620) Steel Crankset Fixing Nut

This heavy‑duty steel crankset fixing nut is designed as replacement mounting part for Bafang M600(G521) and M620(G510) mid‑drive ebike motors.
Note: M‑prefix is retail market model printed on motor housing; G‑prefix is factory OEM internal part number. M600 = G521; M620 = G510. This nut is fully interchangeable between these two motor models.
It securely locks chainring / crankset assembly onto the Bafang mid motor spindle, preventing crankset loosening caused by motor torque and riding vibration. Ideal spare replacement for lost, worn or damaged original nuts during ebike overhaul & maintenance.

Application

✅ Compatible Motor: Bafang M600(G521), M620(G510) mid‑drive ebike motor
✅ Direct replacement for worn, damaged or lost original crankset fixing nut
✅ Suitable for ebike repair shop, DIY ebike maintenance and spare‑parts stocking

Product Specifications

ParameterValue
MaterialSteel
Product TypeCrankset Fixing Nut / Chainwheel Mounting Lock Nut
Fit MotorBafang M600(G521), M620(G510) Mid‑Drive Motor
FeatureHigh‑strength, precise thread, anti‑loosening under torque load

Package Includes

1 × Bafang G521(M600) G510(M620) Crankset Fixing Nut

Key Features

✅ Exact Fit for Bafang M600(G521) & M620(G510)
Precision‑machined thread matches original motor spindle for Bafang M600(G521) 500W eMTB and M620(G510) Ultra 750W‑1000W cargo / fat bike mid‑drive motors. Fully interchangeable between the two motor models.
✅ Durable Steel Construction
Manufactured from solid steel material for high mechanical strength. Delivers stable clamping force to hold chainring and crankset firmly even under high motor torque output.
✅ Anti‑Vibration Locking Performance
Strict thread tolerance reduces risk of nut loosening under continuous vibration from off‑road or heavy‑load riding. Keep stable power transmission from mid‑drive motor to crankset.
✅ Essential Overhaul Spare Part
Critical small component for mid‑motor service. Great backup stock for repair workshops and DIY riders when original nut gets lost, stripped or worn out.
✅ Cost‑Effective Maintenance Solution
Economical replacement part to restore proper chainring mounting without changing complete crank assembly.

Specifications

Product Name: Bafang Mid‑Drive Motor Crankset Fixing Nut
Compatible Motors: Bafang M600(G521), M620(G510)
Material: Steel
Function: Chainwheel / Crankset mounting lock nut
Application: E‑bike mid‑motor repair, crankset maintenance, spare replacement part

Important Notes

⚠️ Only compatible with Bafang M600(G521) and M620(G510). Not fit BBS series, M500, M510, M560 or other Bafang mid‑drive motors.
⚠️ Professional ebike installation recommended. Tighten nut follow Bafang official torque specification. Over‑torque may damage thread.
⚠️ Product photos for reference only, actual product shall prevail.
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We specialize in mid-drive motors and e-bike parts. Strict testing, powerful R&D and flexible OEM service guarantee long-term cooperation.

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It used to take me weeks to hunt down hard‑to‑find e‑bike spare parts. Their compatibility‑check technical support saved me countless repair headaches. Reliable supplier I can always count on.

Mark Wilson Repair Technician

Flexible mixed‑batch ordering is a game‑changer for my business. Low‑risk trial‑order options, fast delivery and solid OEM‑ODM service help me expand my product range with zero inventory pressure.

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We have been sourcing e‑bike components from them for over one year. Product quality is consistent, and their responsive after‑sales support makes our daily shop‑running much easier. Highly recommended.

Ryan Thompson ebike shop owner

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Frequently Asked Questions

We supply genuine OEM parts and premium compatible aftermarket replacement parts for e-bikes, including motor components, controllers, throttles, PAS sensors, wiring harnesses, connectors and Bosch form-factor batteries.

We serve mainstream drive system manufacturers: Ananda, Bafang, Aikema, Tongsheng, Shengyi, Bosch and more. We also provide repair components for complete e-bike brands including Sur‑Ron, Aventon, Trek and many others.

All items are brand-new and inspected before shipment. We do not supply second-hand or refurbished goods.

Our team verifies compatibility according to your bike model, motor info or original part photos. We confirm available OEM parts or recommend workable alternative solutions.

Yes. Flexible order sizes are supported, ranging from single spare parts to bulk purchases.

Sea freight, air freight and rail transport are optional.

Lead time varies by item and shipping mode. We confirm exact timelines before each order and share tracking updates.

We provide part identification, model matching and full order follow-up support.