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Grid squares measure 1x1 inch
Key: 3/16 X 5/8 - X-42-15-S:KohlerKey: 3/16 X 5/8 - X-42-15-S:KohlerKey: 3/16 X 5/8 - X-42-15-S:Kohler

Key: 3/​​16 X 5/​​8 X-42-15-S

Part Number: X-42-15-S
Availability: Ships in 7 - 12 business days
Price: $3.99
Leaves our warehouse within
7 - 12 business days
Product Information
This is an authentic Kohler replacement part that has been sourced from the original manufacturer to be used with small engines. The metal woodruff key is used to link a rotating shaft and gear. The key will fit into the slot on the shaft and match a keyway in the gear. This item is sold as an individual replacement part.
Frequently Purchased With

This part is compatible with the following machines:

Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Engine

Questions & Answers for Key: 3/​16 X 5/​8

Is this a correct fit with above mentioned model? I have seen square shaped and another Is like 1/2 moon shaped. Any difference between the two shapes. Thanks
Joe for model number Kholer 21 sv 610-0212 asked on 2022-04-30
Hi Joe, Thank you for your question. Yes, this would be the correct key for your engine. Woodruff keys are used on shafts that are 2-1/2 inches in diameter. The square key is used on shafts with a 1 inch diameter. If you need help placing an order for the keys, customer service is open 7 days a week and anyone will be happy to assist you. Please feel free to give us a call. We look forward to hearing from you!
eReplacementParts Team April 30, 2022
Repair Instructions: Submitted by Customers Like You
1 of 2 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Key: 3/16 X 5/8 - X-42-15-S
Oil Seal - 20 032 08-S
Repair Difficulty:
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set, Wrench Set, impact, fiy wheel puller, small hammer.
Remove bolt from crank, pull pulley off of crank, remove nut from fly wheel use puller to remove the fly wheel.Replace seals on sump and top of block fly wheel side, put new woodruff key in bottom slot put pulley back on and bolt down. Put fly wheel back on make sure key is in place torque fly wheel nut to specs.
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Average Rating (out of 5):
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  • First repair attempt...worked like a charm!
    Not a fan of USPS delivery. Part arrived a day late, however, once installed after watching a few online videos my tractor started right up! Bought a spare, just in case!
    Guest - April 13, 2021 Verified Purchase
    Verified Purchase
    eReplacementParts Team
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    Product Information
    7174 South 400 West
    Suite 5
    Midvale, UT 84047
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