Style M bobbins are typically used on mid-sized and large commercial machines for sewing heavy fabric, canvas, upholstery, and leather.
Style M bobbins are normally used with mid-sized and large commercial machines for heavy fabric, canvas, upholstery, and leather. Its diameter is slightly greater than a U.S. quarter, and its height is just barely taller than 6 quarters stacked.
Dimensions
Diameter: 1-1/64" (1.02 In.), 2.60 cm
Height: 7/16" (0.435 In.), 1.10 cm

Information
Bobbin Buying Guide
Machine / Style Reference
Bobbin Style Guide - PDF

Code Color Description
bobbins-style-m-46 Bobbins - Style M - Size 46
Style M / Size 46 bobbins are typically used with topstitch thread size 69.
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bobbins-style-m-69 Bobbins - Style M - Size 69
Style M / Size 69 bobbins are typically used with topstitch thread size 92.
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bobbins-style-m-92 Bobbins - Style M - Size 92
Style M / Size 92 bobbins are typically used with topstitch thread size 138.
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bobbins-style-m-138 Bobbins - Style M - Size 138
Style M / Size 138 bobbins are typically used with topstitch threads that are size 207 and higher.
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