Tip & How-To about Sewing Machines

How to Adjust Bottom Thread Tension on a Sewing Machine

If you have looping under your fabric, there is too much tension in the bobbin case. Turn the little screw on the bobbin case 1/4 turn to the left. If you still have some looping, turn your upper tension dial to the next highest number.

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2 Answers

How do you set the bottom tension and/or where is the thread clamp


Be very careful adjusting the tension on the bobbin case. Generally, most tension issues are regulated using the upper tension adjustment unless the bobbin case is broken or someone has attempted to adjust it incorrectly. In any event, adjustments to the bobbin case should be made ONLY 1/8 of a turn at a time--then do a test stitch. Before making any changes, mark with a permanent marker where the screwdriver slot meets the bobbin case in the event you have to return it to the original position.

If the top thread is looping or knotting under the fabric (bird nesting), the upper thread is too loose or it is threaded incorrectly.

If the top thread is pulling the bobbin thread to the top of the fabric, the upper tension is too tight.

Tension is ideal when both threads meeting in the middle of the fabric.

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Dec 11, 2015 | Sewing Machines

2 Answers

Top thread too tight. Bobbin thread too loose. Bobbin thread bunches up underneath material. The feeder teeth can not feed material through


first thing first - thread inside bobbin should be tightly wound in. Insert bobbin into bobbin case and thread through slot and under the spring. Spring has small screw which regulates the tension. Hold the thread like yo-yo and jerk a little down-up. It should drop just a little (not run down) - that is usually required bottom thread tension,
if not, regulate with the screw. Set top thread tension 3 and sew. If still looping under, increase the top tension higher till the looping disappears. .

Nov 03, 2015 | Sewing Machines

2 Answers

when i sew a test piece of fabric on my sewing machine to check the stitching, the top thread seems fine but the bottom thread is loose and adjusting the tension doesn't seem to help


there are two thread tensioners on a machine
the first one is on the front of the machine for the top thread
the second is the small screw that holds the small flat spring under which you pull the thread after you put the bobbin in the holder
as you put the bobbin in the holder you have to pull the thread around the side until it slips into a small slot then under a retainer spring
that spring is adjustable by that small screw
the amount of tension added or released by that screw is minute so as little as 1/8 turn has a big bearing on the amount of tension of the bobbin thread so turn it just a small bit at a time until the thread tension is correct

Oct 14, 2015 | Sewing Machines

2 Answers

How do I fix a bobbin tnesion problem>


Bobbin tension is one of the biggest problems most sewing machine operators have. Check information sent for assistance on this.
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Jul 23, 2015 | Sewing Machines

1 Answer

tension is loose underside


Loops appear on the surface (top side) of the fabric?
Reduce the tension by turning the upper tension control dial to a lower number. If the loops still appear on the surface of the fabric after you adjust the upper tension, the bobbin thread may be too loose. In this case, turn the screw clockwise, being careful not to over-tighten the screw, approximately 30-45 degrees to increase bobbin tension. After you adjust the bobbin thread, adjust the upper thread to match the bobbin thread.
Make sure you reset before your next project.

Apr 26, 2013 | Brother LS-2125 Mechanical Sewing Machine

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