I am having trouble finding what the difference or the meaning of a M8 x 1 vs a M8 x 1.25 Grease Zerk fitting. What does the last number mean (the 1 vs 1.25) is it the length of the thread or the cut or taper of the thread ? Thanks
Metric Zerks
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2012 Kubota 2920, 60MMM, FEL, BH65 48" Bush Hog, 60"Backblade, B2782B Snowblower
It is the thread pitch. In other words in American it would be Coarse or Fine Thread. Metric, I believe has 3 different pitches 1, 1.5, 2.
Lot more than 1, 1.5, and 2. I just found this chart and it kinda blew my mind.
https://www.fullerfasteners.com/tech/basic-metric-thread-chart-m1-m100-2/
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Thanks guys. No one a my local [Napa Auto Parts (its 30 miles away) ] knew, of course it was a Saturday, I took in my original and they wanted to sell me a M8 x 1 grease zerk. As they didn't stock the M8 x 1.25. I then went down the street to O'Reilly auto and the fella was really helpful I mean he really tried to find the grease zerk for me. But only had the M8 x 1 grease zerk I was impressed for all the time he spent looking for me. I ordered 10 M8 x 1.25 zerks in a 10 pack. From Grangier for like 2.96 and 11 bucks shipping should them in two days, Saving me a trip to town and 5 gallons of fuel. Bill
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The O'Reilly I attend has an assortment of metric grease ftgs. You can get them at Harbor Freight also.
This is a classic case of Japanese standard (JIS) versus European standard (DIN) thread pitch. At least it is better than the British motorcycles from the sixties with three different thread standards: DIN, Imperial and British Whitworth.