What Size tap To Replace That 5/16 Axle Zerk? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 8 Old 01-17-2016, 08:57 PM Thread Starter
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What Size tap To Replace That 5/16 Axle Zerk?

Mine has one of those cheap driven in axle zerks that sticks out the side of the gear box behind the wheel. I pretty much doubt that another drive in is going to stay put. What is the drill and tap size you guys use to upsize that zerk to a screw in?

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post #2 of 8 Old 01-17-2016, 10:00 PM
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I don't know about that specific application but most zerks with threads will cut their own threads. They have a shape like a pipe thread that gets bigger and jams itself into the hole as it's screwed in.

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post #3 of 8 Old 01-18-2016, 09:16 AM Thread Starter
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I'll give it a try. Plenty of meat there to mess it up and go bigger. ****, I never even knew they had such a thing as a drive in zerk and had never seen one before. I thought the threads were stripped off by the prior owner. I suppose this is one of those el cheapo step savers that companies use today. It sure seems like one of those things that you just know can't hold up long term.

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post #4 of 8 Old 01-18-2016, 10:34 AM
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I'm in the same boat. All the ones I've ever seen were on cars and they all threaded in. First one I saw (last year) I thought it stripped out too until I saw a photo of the replacement.

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post #5 of 8 Old 01-18-2016, 12:11 PM
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My 2004 Craftsman has press-in zerks on the auger shaft. I used a normal grease gun end fitting to grease them and they pulled out. I hammered them back in and use a small needle type fitting that just pushes the little ball bearing in so grease can flow. It is the type of grease gun fitting used to lubricate 4WD front constant velocity universal joints that have a cup fitting between the two close fitting joints.

A threaded zerk will work better where you have the room to install.

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post #6 of 8 Old 01-18-2016, 12:20 PM
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The smallest pipe thread Zerk will be 1/8" NPT, which is a pretty big hole. You can get ones with 1/4" bolt thread which will take a 13/64" drill and 1/4" nc tap. If you can get the axle out easily, this will be an easy job, because you don't have to worry about the bottom of the hole and a bottom hole tap. You will be able to do the whole job with a starting tap.
Press in Zerks have been common for a long time, but I never liked them.


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post #7 of 8 Old 01-18-2016, 11:22 PM Thread Starter
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Quote:
Originally Posted by Kiss4aFrog View Post
I'm in the same boat. All the ones I've ever seen were on cars and they all threaded in. First one I saw (last year) I thought it stripped out too until I saw a photo of the replacement.

Same here. First I couldn't figure out how I stripped that zerk putting it back on. Then came the part where somehow I peeled off every thread as flush as if I had rolled it across a grinder. After that was looking down the bore of that shaft all cleaned up and not seeing any torn up threads. It actually took some time with the manual to find out the stupid things even exist. Just another of those Homer Simpson moments. Duhhhhh.

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post #8 of 8 Old 01-18-2016, 11:53 PM
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I take it that 5/16 was the wrench size of the zerk that you want to put in? 1/4-28 is very common and about 2/3 of the diameter of 1/8 NPT.
someone above said 1/4 NC thread. That would be 1/4-20. (20 being the thread count in an inch of threaded bolt) What you want is 1/4 NF. (National "fine" thread)
NC is "National Coarse" thread)
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