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PROWHEEL

PROWHEEL Bike Hex Crank Arm Fixing Bolts Spindle 8mm Allen Key Bolt Screws Capless Bottom Bracket for Cycling Bicycle Axle Fits Many Bike Cranksets

  • Based on 131 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Jul 31
Order within 1 hour and 48 minutes
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Color: Black 2PC M8 15 BOLTS


Features

  • 8mm Hex Head Crank Fixing Bolt and Cap Pair
  • Hex-type steel crank fixing bolt set with integrated plastic dust cap
  • Crank bolts. They fit square tapered bottom brackets as well as standard bb's. Please make sure to use metric 8mm allen head for installation.
  • Bolt size: 8x1.0mm hex cap
  • Packing Includes: 2 Pieces 8mm Hex Head Crank Arm Bolts.

Description

8mm Hex Crank Arm Fixing Bolt and Cap replace the old bolts for your crank. Uses an 8mm hex wrench.Please note: If your crank arm is ovalized and keeps falling off. Replacing the bolt with keep the crank arm attached for a while but will eventually fall off. If this happens you will need a new crank arm. When the square taper is ovalized from wear, it will back out the boltM8 (8mm)thread, thread 18mm long, 20mm dia. end capPackage Contents: 2pcs BoltsPlease note if your crank arm bolt is stripping, it is usually due to the bottom bracket axle threading and not the crank, in that case, you will need a new bottom bracket axle

Material: Alloy Steel


Thread Size: M8


Exterior Finish: Unfinished


Manufacturer Grade: Grade 8


Head Style: Hex, Square


Thread Size: M8


Exterior Finish: Unfinished


Manufacturer Grade: Grade 8


Screw Head Style: Hex, Square


Color: Black 2PC M8 15 BOLTS


Fastener Type: Hexagon Bolt


Thread Type: [Iso]


Thread Style: Right Hand


Head Type: Hex


Thread Class: M


Set Screw Thread Type: Metric


Material Type: Alloy Steel


Metal Type: Alloy Steel


Item Diameter: 20 Millimeters


Size Name: M8x1.0


Number of Pieces: 2


Outside Diameter: 20 Millimeters


Fastener Size: M8x1.0


Thread Coverage: Partially Threaded


Brand: PROWHEEL


Manufacturer: Prowheel


Number Of Items: 2


Part Number: Hex Crank Arm Bolts


Unit Count: 2.0 Count


Included Components: 2 Pieces 8mm Hex Head Crank Arm Bolts.


Item Type Name: Crank Arm Fixing Bolts


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Jul 31

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Good fit.
Color: Black 2PC M8 15 BOLTS
They work as designed.
Reviewed in the United States on November 18, 2025 by Adrian Batchelor
    • Good 👍
Color: Sliver 2PC M8 18 BOLTS
Good 👍
Reviewed in the United States on February 26, 2026 by Mishkin
    • Exact Thread
Color: Black 2PC M8 18 BOLTS
Perfect fit. Crank arm is now back on and snug.
Reviewed in the United States on November 17, 2025 by Richard
    • Fits perfect.
Color: Black 2PC M8 18 BOLTS
This worked perfectly for my grandsons bike. It's holding up nicely. I'd highly recommend
Reviewed in the United States on April 27, 2026 by Amazon Customer
    • It's a crank bolt It's a crank bolt
Color: Black 2PC M8 18 BOLTS
Review Image by ibuythingsonlinebecauseihavesocialanxiety
After snapping a crank bolt, these are an adequate affordable replacment. I've had no issues with them after several hundred miles of use.
Reviewed in the United States on April 5, 2026 Reviewed in the United States on April 5, 2026 by ibuythingsonlinebecauseihavesocialanxiety
    • Direct replacement
Color: Black 2PC M8 18 BOLTS
These bolts work perfectly on my Giant Escape 2
Reviewed in the United States on September 19, 2025 by DAVE J.
    • Great product
Color: Sliver 2PC M8 18 BOLTS
Fast shipping
Reviewed in the United States on November 21, 2025 by carlos c.
    • ? It's a hex crank
Color: Sliver 2PC M8 18 BOLTS
Exactly what it should be
Reviewed in the United States on March 16, 2026 by Sarah Pierce

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