The catch
Singer Heavy Duty 6380
Its 6.25-inch throat stays the same size even with the supplied table
Side by side
Singer Heavy Duty 6380 vs Singer Heavy Duty 6700C: 6380 comes with bulky-seam tools, and 6700C limits speed for detailed work
Quick verdict
When flat household projects and bulky seam transitions are the main job, the 6380 fits with its supplied extension table and clearance plate. Go with the 6700C for electronic speed limiting, more buttonhole styles and sewn lettering.
Before you buy
Why, and what it costs you
The large table comes with the mechanical model
Fabric to the left rests on the 6380's table. On the right, its 6.25-inch throat still limits rolled fabric.
Where this comes from
6380 comes with a table and 6.25-inch needle-to-tower space.
The catch
Singer Heavy Duty 6700C
Calling it heavy-duty does not prove industrial-duty capability
Singer Heavy Duty 6380
- Why pick it
- Wider fabric supported by an included extension table
- Raised seam transitions handled with a clearance plate
- The catch
- Its 6.25-inch throat stays the same size even with the supplied table
Singer Heavy Duty 6700C
- Why pick it
- Detailed work with a maximum-speed setting
- Sewn lettering plus seven one-step buttonhole styles
- The catch
- Calling it heavy-duty does not prove industrial-duty capability
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What this page compares
Singer Heavy Duty 6380 or Singer Heavy Duty 6700C? Here is how they differ, what each package includes and which suits your projects.
Support for fabric, or electronic control of pace
Which one fits
Pick the situations that sound like you
Table support comes included for wider flat projects
The extension table comes explicitly with 6380.
- Singer Heavy Duty 6380
- Better fit
- Singer Heavy Duty 6700C
- Depends
Keeping a curved seam under careful control
A maximum-speed control comes with 6700C.
- Singer Heavy Duty 6380
- Good
- Singer Heavy Duty 6700C
- Better fit
Sewing over a raised trouser seam
A clearance plate comes with 6380, though the correct needle and setup are still necessary.
- Singer Heavy Duty 6380
- Better fit
- Singer Heavy Duty 6700C
- Depends
A number of decorative buttonhole styles
Seven styles come with 6700C.
- Singer Heavy Duty 6380
- Good
- Singer Heavy Duty 6700C
- Better fit
In practice
Differences you will notice
The large table comes with the mechanical model
Fabric to the left rests on the 6380's table. On the right, its 6.25-inch throat still limits rolled fabric.
How we worked this out
6380 comes with a table and 6.25-inch needle-to-tower space.
These models offer almost the same throat room
Throat width on the 6700C is 0.15 inch more. That is too little evidence to call it a substantially roomier quilting machine.
How we worked this out
6.4 less 6.25 is 0.15 inch.
A clearance plate and a speed slider help at different moments
Over a raised seam, the 6380's plate helps level the foot. Through a detailed section, the 6700C's speed control limits pace. Without a matched test, neither proves superior sewing through thick seams.
How we worked this out
Singer ties the 6380 plate to seam leveling and 6700C to maximum-speed control.
Option A
Singer, Heavy Duty 6380
Heavy Duty 6380
A clearance plate keeps the foot level over a thick seam, and the included table holds the fabric up. Adjustable pressure gives you control across different fabrics.
- Best for
- Wider fabric supported by an included extension table
Facts we checked
- Extension table: Supplied
- Buttonhole styles: A single one-step style
- Speed control: Mechanical, run from the pedal
- Width of throat: 6.25 inches
Option B
Singer, Heavy Duty 6700C
Heavy Duty 6700C
Before a tricky curve, electronic speed control lets you hold the pace down more easily. One-step buttonholes and lettering give garment projects more options.
- Best for
- Detailed work with a maximum-speed setting
Facts we checked
- Extension table: Check which package the listing covers
- Buttonhole styles: Seven, all one-step
- Speed control: A control for maximum speed
- Width of throat: 6.4 inches
Spec by spec
Where they really differ
| Spec | Singer Heavy Duty 6380 | Singer Heavy Duty 6700C | In practice |
|---|---|---|---|
| Extension table | Included | Confirm the exact listing package | Table support is explicitly supplied with the 6380. Don't assume every 6700C kit includes it. |
| Buttonhole styles | One one-step style | Seven one-step styles | The 6700C brings more design choices to a process that both automate. |
| Speed control | Pedal-controlled mechanical operation | Maximum-speed control | Before a difficult seam, you can cap sewing pace on the 6700C. |
| Throat width | 6.25 inches | 6.4 inches | The 0.15-inch gain looks tiny next to the visible size of an extension table. |
| Stitch selection | Mechanical dial | Electronic selection with lettering | Pick the workflow you want, and don't compare stitch applications as though they were unique patterns. |
Trade-offs
What each pick costs you
With Singer Heavy Duty 6380
- Where the 6700C has seven, it has one automatic buttonhole style.
With Singer Heavy Duty 6700C
- Its 6.4-inch throat is just 0.15 inch wider than the 6380's, giving little extra clearance for a bulky rolled quilt.
Change of plan
When the answer changes
Table support has to come in the box
Go with Singer Heavy Duty 6380. An extension table comes with the 6380.
The control that matters to you is a speed ceiling
Go with Singer Heavy Duty 6700C. This feature is documented for the 6700C.
You require a throat above 8 inches
Neither model fits. Each stays near 6.3 inches and falls short of the required opening.
Decision guide
How to decide
Pick the 6380 if flat household projects and bulky seam transitions are the main job, since it supplies an extension table and clearance plate. The 6700C is the choice for electronic speed limiting, more buttonhole styles and sewn lettering.
The large table comes with the mechanical model
Fabric to the left rests on the 6380 table, but its 6.25-inch throat still limits rolled fabric on the right. The 6380 includes a table and has 6.25-inch needle-to-tower space.
These models offer almost the same throat room
Throat width grows by 0.15 inch on the 6700C. That is not enough evidence to call it a substantially roomier quilting machine. The math is 6.4 minus 6.25 equals 0.15 inch.
A clearance plate and a speed slider help at different moments
The plate on the 6380 helps level the foot over a raised seam, and the speed control on the 6700C limits pace through a detailed section. Without a matched test, neither proves superior sewing through thick seams. Singer assigns seam-leveling use to the 6380 plate and maximum-speed control to 6700C.
Check the package before you price the upgrade
A particular Amazon bundle may not match Singer's current manufacturer accessory list. Confirm the supplied feet and table in the listing you select. A compatible accessory shown elsewhere on the page may be an extra purchase.
What this page can’t tell you
- Published specifications and exact package records are the basis for this comparison, which is not a hands-on seam-quality test.
- Fabric, needle, thread and setup change the results, and a heavy-duty name or maximum stitch rate does not prove industrial capability.
By the numbers
What the data shows
What we found across the sewing machines we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Singer Heavy Duty 6380 |
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| Singer Heavy Duty 6700C |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Singer Heavy Duty 6380
Wider fabric supported by an included extension table
See price & reviews on AmazonSinger Heavy Duty 6700C
Detailed work with a maximum-speed setting
See price & reviews on AmazonEach link opens in a new tab.
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