Why Is My Sewing Machine Skipping Stitches on Thick Fabric or Denim?
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That distinct popping sound as the needle deflects on thick denim, followed by a line of skipped stitches, signals a needle that’s too fine for the job. The point bends under pressure, the hook misses the thread loop, and the stitch fails.
Skipped stitches on heavy fabric can stem from several causes, but the needle is often a primary suspect. On thick fabric, a standard needle may bend under pressure instead of piercing cleanly, which prevents proper loop formation with the bobbin thread. This issue is frequently fixable with the right needle before considering machine service or replacement.
Here’s the breakdown of what’s happening and how to address it systematically.
When the Needle Can’t Cope
At the bottom of each stitch cycle, the machine’s hook must catch the thread loop formed by the needle. For thin cotton or light jersey, an 80/12 needle manages this easily. The fabric offers little resistance, the needle stays aligned, and the loop forms cleanly.
Denim presents a different challenge. A double layer of rigid, densely woven cotton pushes back hard against the descending needle. If the needle shaft is too thin for that pressure, it deflects. A bent needle cannot form a proper loop. The hook catches nothing, the bobbin thread stays untouched, and you get a skipped stitch. Continued deflection can eventually lead to a snapped needle or damage to the hook mechanism.
Needle orientation also matters. Needles have a flat side that must face the back of the machine when inserted. Incorrect orientation places the needle eye in the wrong position, which can prevent reliable stitch formation and may cause skipped stitches, even on lighter fabrics.
The solution typically involves a larger, stronger needle suited to the fabric, rather than tension adjustments or immediate service.
Choosing the Right Needle for Heavy Fabrics
For denim and thick fabric, 90/14 is a common starting point. Choose the size according to fabric weight and thread. For heavy layers—like a seam on heavyweight denim or multiple fabric layers—consider moving to 100/16.
A larger needle has a thicker shaft that better resists bending under pressure, and a larger eye that allows thread to pass through with reduced friction. This helps the thread follow the needle cleanly, enabling proper loop formation.
A widely used option for denim is the Schmetz Jeans needle. Schmetz needles are readily available, and the reinforced blade is designed to handle multiple denim layers and thick seams. The ballpoint-style point is slightly rounded, which may reduce snagging on stretch denim.
An affordable alternative is Hemline Jeans Needles (paid link) — they are sharp and suitable for standard denim work. Needle performance can vary with the machine and fabric. If they work for your setup, they represent good value.
An 80/12 universal needle may be unsuitable for heavier denim as its thinner shaft is more prone to bending under the pressure of dense fabric, which can prevent proper loop formation and cause skipped stitches. For heavy denim or multiple layers, a size 100/16 or 110/18 may be suitable, depending on the specific fabric, thread, and your machine’s capability. These larger sizes have a reinforced shaft for better resistance to bending. It’s also important to use a strong thread like polyester, matched to the needle size. For topstitching on heavy denim, a dedicated topstitching thread with a larger needle can yield a cleaner result.
View Hemline Jeans Needles on Amazon → (paid link)
For lighter denim or denim-style cotton drill, an 80/12 Jeans needle or a 90/14 universal might suffice. For thicker seams or multiple layers, sizing up is advisable. Using an undersized needle on heavy fabric is a frequent cause of skipping.
Quick check: If you’re sewing denim with an 80/12 needle, it’s likely too small for the task.
Addressing Feed Issues with the Presser Foot
If you’ve changed to the correct needle size and skipping continues, examine how the fabric feeds under the presser foot.
On a thick seam that sits higher than the surrounding fabric, a standard presser foot may tilt or ride up. This can cause the needle to punch at an angle, disrupting loop formation even with the correct needle. This is a common reason a machine might skip on a thick seam but not on the flat fabric.
A spring-loaded or adjustable compensation foot can help. Its design allows the foot to move vertically over variations in fabric height, maintaining more even pressure and keeping the fabric flatter under the needle. This improves stitch quality across seam transitions. Alternatively, you can carefully guide the fabric to keep it level.
It’s worth noting that a compensation foot assists with feeding fabric over uneven heights; it does not increase the needle’s penetration strength. If the needle itself is bending due to the machine’s limitations, a different foot won’t solve that core issue.
Assessing Machine Capability
Fitting the right needle often resolves skipped stitches on denim. If you’ve tried the correct needle, ensured proper threading with the presser foot raised, cleaned out lint, and the machine still stalls, skips, or grinds on thick fabric, the machine’s capability may be the limiting factor.
📺 Watch: How to Set your MACHINE to SEW TICK FABRIC WITHOUT …
Heavy-duty sewing machines are engineered for such work. Features can include a reinforced metal frame to resist flexing under load, a more powerful motor to maintain speed through dense material, and enhanced feed mechanisms. Frame rigidity is particularly important because any flex when the needle meets resistance alters stitch geometry enough to break loop formation.
If the machine grinds, stalls, or the needle visibly strikes the needle plate when sewing over a seam, it’s advisable to stop. This indicates a need for service, or it may suggest the machine is underpowered for regular heavy work.
Investing in a heavy-duty machine makes sense if you frequently sew denim, canvas, or workwear. For occasional projects, a service and the correct needle are usually sufficient.
Step-by-Step Troubleshooting Sequence
Work through these checks methodically. These steps address several common causes.
📺 Watch: Sewing Machine Troubleshooting - Skipped Stitches
Rethread completely. Raise the presser foot to release the tension discs. Unthread the machine completely and rethread it carefully, ensuring the thread passes correctly through every guide.
Fit the correct needle. Choose a Jeans/Denim needle appropriate to the fabric weight; 90/14 is common, while heavier seams may need 100/16. Insert it with the flat side facing the machine’s back, pushing it up firmly into place.
Check the bobbin. Verify it is the correct type for your machine and seated properly in its case. An incorrectly seated bobbin can cause inconsistent stitches.
Clean the lint. Remove fibres from the feed dogs, bobbin area, and around the needle plate. Lint can interfere with feeding and thread movement.
Adjust tension last. Only if skipping persists, try loosening the top tension slightly—a small increment at a time—testing on a fabric scrap after each adjustment.
If these steps don’t resolve the issue and the machine shows signs of mechanical struggle, seek a service rather than continuing adjustments.
Keep this sequence handy with the free Sew and Fix Fault-Finding Checklist .
Guide to Needle Sizes for Dense Materials
| Fabric Type | Needle Size | Notes |
|---|---|---|
| Light Denim | 90/14 | Suitable for single layers |
| Medium Denim | 90/14 Jeans | Reinforced blade for standard seams |
| Heavy Denim | 100/16 | For double or triple folds |
| Canvas | 100/16 | Rigid, dense weave |
| Multiple Layers | 110/18 | For especially thick woven layers, depending on fabric and machine |
| Stretch Denim | 90/14 Stretch | Designed for fabrics with elastane |
Skipped stitches on denim are frustrating but often solvable. Begin with the correct needle size, ensure careful rethreading, and follow the troubleshooting sequence before concluding the machine is at fault.
Related Guides
For a complete overview, see our Sewing Machine Stitch Problems: What to Check First, and in What Order .
Sources & Further Reading
- Why is my sewing machine skipping stitches?
- Sewing Machine Needles: A Simple Guide to Better Stitching
- Sewing Machine Needles - WonderFil UK
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Note: General guidance only, verify details with a qualified professional or official source.