Superior Bottom Line 60wt Polyester Thread White 603 Yards

The Superior Bottom Line 60wt Polyester Thread — White, 603 Yards is the industry-standard fine bobbin thread specifically designed for use in the bobbin of longarm and home quilting machines paired with standard 40wt top thread. Bottom Line’s ultra-fine 60wt weight produces minimal bobbin thread bulk, allowing top thread tension to dominate the stitch formation for cleaner, more defined quilting designs.

Top 10 Questions About Superior Bottom Line Thread

Why use Bottom Line in the bobbin?

Bottom Line 60wt is finer than 40wt bobbin thread, creating less bobbin thread bulk in the stitch. This allows the 40wt top thread to dominate the visual stitch, producing cleaner line definition. It is also the recommended bobbin thread when using So Fine 50wt top thread for a balanced fine-thread pairing.

Is white the most important Bottom Line color?

White is the most universally used Bottom Line color, serving as the standard neutral bobbin for all light backing fabrics when using any top thread color.

What is 603 yards?

603 yards is a standard pre-wound bobbin thread spool. For hand-winding bobbins, 603 yards provides multiple bobbin fills before the spool is exhausted.

Is Bottom Line appropriate for all longarm machines?

Yes — Bottom Line 60wt is designed for standard longarm and home machine bobbin systems. Use appropriate bobbin tension settings for the finer thread weight.

Does Bottom Line require tension adjustment?

Fine bobbin thread may require slight tension adjustment compared to standard 40wt bobbin thread. Test and adjust to achieve balanced stitch formation before production use.

What bobbin cases does Bottom Line work with?

Bottom Line works in M-size and other standard longarm bobbin cases. Check Superior’s recommendations for specific case compatibility.

Is Bottom Line available in other colors?

Yes — Superior Bottom Line is available in black and other neutral colors. Check Linda’s current inventory for available colors.

When should I use Bottom Line instead of pre-wound bobbins?

When using So Fine 50wt top thread, Bottom Line provides the balanced fine-thread pairing. For standard 40wt production, Magna-Glide pre-wound bobbins are more convenient.

Is Bottom Line colorfast?

Yes — Superior Bottom Line is manufactured to premium colorfast standards.

Is this the same thread wound in Magna-Glide Delights bobbins?

The Delights bobbin system uses a different Magna-Glide proprietary thread; Bottom Line is a separate Superior product used for hand-winding or specific thread-pairing applications.

Common Uses

• Bobbin thread for all light backing fabrics at 60wt fine weight
• Paired with So Fine 50wt top thread for balanced fine-thread production
• Winding bobbins with ultra-fine white thread for reduced bobbin bulk
• Any application where 60wt fine bobbin thread provides superior stitch quality over 40wt