M-Style Bobbin Thread Capacity

[GerryR]

I would like to know the capacity of M-style bobbins for #69, 92, 138 and 207 thread,  I looked up for prewound bobbins for #138 thread and they stated 36 yds. but said  the same for 92 thread, which didn't sound right to me. (They were probably just loading a fixed amount on the bobbins, not filling to capacity.)  I would like to know the full capacity, +/-, of the M bobbins for the size threads stated.  Can anybody help?  Thanks.

[CowboyBob]

13 hours ago, GerryR said:

I would like to know the capacity of M-style bobbins for #69, 92, 138 and 207 thread,  I looked up for prewound bobbins for #138 thread and they stated 36 yds. but said  the same for 92 thread, which didn't sound right to me. (They were probably just loading a fixed amount on the bobbins, not filling to capacity.)  I would like to know the full capacity, +/-, of the M bobbins for the size threads stated.  Can anybody help?  Thanks.

69=44 yd,92=34 yd,138=23 yd,we don;t stock 207's so IDK how many yards they have.

[GerryR]

Thank you Bob!  It looks like there is about a 10 yd difference between sizes so maybe I can assume 13 yds. for 207 until I can verify it.

[GerryR]

@CowboyBob

I had built a bobbin winder machine using a Rapala digital fishing line counter (see picture) and just received some M-bobbins, and though I haven't yet wound all the above size threads, I did wind sizes 138 and 207.  I got 42 feet of 138 and 32 feet of 207 on the bobbins.  They are probably not wound as tight or as uniform as the "store bought" bobbins but the discrepancy of 69 ft to 42 feet seems quite a lot.  When I have the time I will redo the 138 and 207 and run some 69 and 92 thread.  Just thought you would like to know.  I will follow uo in a few days.