Main trade-off
Singer Heavy Duty 6380
The supplied table does not increase its 6.25-inch throat
Head-to-head
Singer Heavy Duty 6380 vs Singer Heavy Duty 6700C: 6380 supplies bulky-seam tools, 6700C limits speed for detailed work
The short answer
Choose the 6380 for its supplied extension table and clearance plate when flat household projects and bulky seam transitions are the main job. Choose the 6700C for electronic speed limiting, more buttonhole styles and sewn lettering.
Before you choose
The reasoning and the trade-offs
The large table is on the mechanical side
The 6380's table supports fabric to the left. Its 6.25-inch throat still limits rolled fabric on the right.
What this is based on
6380 includes a table and has 6.25-inch needle-to-tower space.
Main trade-off
Singer Heavy Duty 6700C
A heavy-duty label does not establish industrial-duty capability
Singer Heavy Duty 6380
- Choose it for
- An extension table included for wider fabric
- A clearance plate for raised seam transitions
- Main trade-off
- The supplied table does not increase its 6.25-inch throat
Singer Heavy Duty 6700C
- Choose it for
- A maximum-speed setting for detailed work
- Seven one-step buttonhole styles and sewn lettering
- Main trade-off
- A heavy-duty label does not establish industrial-duty capability
About this comparison
Compare Singer Heavy Duty 6380 and Singer Heavy Duty 6700C. See which fits your projects, the useful differences and what each package includes.
Fabric support or electronic pace control
Winner by situation
Start with what you need it to do
Wider flat projects with table support included
6380 explicitly supplies the extension table.
- Singer Heavy Duty 6380
- Better fit
- Singer Heavy Duty 6700C
- Depends
Carefully controlling a curved seam
6700C supplies a maximum-speed control.
- Singer Heavy Duty 6380
- Good
- Singer Heavy Duty 6700C
- Better fit
Crossing a raised trouser seam
6380 includes a clearance plate, with correct needle and setup still necessary.
- Singer Heavy Duty 6380
- Better fit
- Singer Heavy Duty 6700C
- Depends
Several decorative buttonhole styles
6700C offers seven styles.
- Singer Heavy Duty 6380
- Good
- Singer Heavy Duty 6700C
- Better fit
What matters in practice
The differences that matter
The large table is on the mechanical side
The 6380's table supports fabric to the left. Its 6.25-inch throat still limits rolled fabric on the right.
How we reached this conclusion
6380 includes a table and has 6.25-inch needle-to-tower space.
Throat room barely changes between these models
The 6700C adds 0.15 inch of throat width. That is insufficient evidence to call it a substantially roomier quilting machine.
How we reached this conclusion
6.4 minus 6.25 equals 0.15 inch.
A clearance plate and a speed slider solve different moments
The 6380's plate helps level the foot over a raised seam. The 6700C's speed control limits pace through a detailed section. Neither proves superior sewing through thick seams without a matched test.
How we reached this conclusion
Singer assigns seam-leveling use to the 6380 plate and maximum-speed control to 6700C.
Choice A
Singer, Heavy Duty 6380
Heavy Duty 6380
The included table supports fabric while a clearance plate helps keep the foot level at a thick seam. Adjustable pressure adds control across fabrics.
- Best matched use
- An extension table included for wider fabric
Checked facts
- Extension table: Included
- Buttonhole styles: One one-step style
- Speed control: Pedal-controlled mechanical operation
- Throat width: 6.25 inches
Choice B
Singer, Heavy Duty 6700C
Heavy Duty 6700C
Electronic speed control makes it easier to limit the pace before a tricky curve. Its one-step buttonholes and lettering broaden garment choices.
- Best matched use
- A maximum-speed setting for detailed work
Checked facts
- Extension table: Confirm the exact listing package
- Buttonhole styles: Seven one-step styles
- Speed control: Maximum-speed control
- Throat width: 6.4 inches
Meaningful differences
What changes the fit
| What changes | Singer Heavy Duty 6380 | Singer Heavy Duty 6700C | Why it matters |
|---|---|---|---|
| Extension table | Included | Confirm the exact listing package | The 6380 explicitly supplies table support. Do not assume every 6700C kit includes it. |
| Buttonhole styles | One one-step style | Seven one-step styles | The 6700C adds design choices while both automate the process. |
| Speed control | Pedal-controlled mechanical operation | Maximum-speed control | The 6700C can cap sewing pace before a difficult seam. |
| Throat width | 6.25 inches | 6.4 inches | The 0.15-inch gain is much smaller than the visual size of an extension table. |
| Stitch selection | Mechanical dial | Electronic selection with lettering | Choose the workflow you want rather than comparing stitch applications as unique patterns. |
What you give up
Every choice has a cost
If you choose Singer Heavy Duty 6380
- It has one automatic buttonhole style versus seven on the 6700C.
If you choose Singer Heavy Duty 6700C
- Its 6.4-inch throat is only 0.15 inch wider than the 6380, so it offers little extra clearance for a bulky rolled quilt.
Recommendation switch
The decision flips if...
You need table support in the box
Choose Singer Heavy Duty 6380. The 6380 includes an extension table.
A speed ceiling is the important control
Choose Singer Heavy Duty 6700C. The 6700C documents this feature.
You need a throat above 8 inches
Choose neither. Both remain near 6.3 inches rather than the required opening.
What matters in practice
How to make the call
Read the package before pricing the upgrade
Singer's current manufacturer accessory list and a particular Amazon bundle may differ. Confirm the supplied feet and table in the selected listing. A compatible accessory shown elsewhere on the page may be an extra purchase.
What this comparison cannot tell you
- This comparison uses published specifications and exact package records. It is not a hands-on seam-quality test.
- Fabric, needle, thread and setup affect results. A heavy-duty name or maximum stitch rate does not establish industrial capability.
What the facts say
What the comparison shows
Useful conclusions from the current sewing machines comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Singer Heavy Duty 6380 |
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| Singer Heavy Duty 6700C |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Singer Heavy Duty 6380
An extension table included for wider fabric
See price & reviews on AmazonSinger Heavy Duty 6700C
A maximum-speed setting for detailed work
See price & reviews on AmazonLinks open in a new tab.