Bernette Funlock B48 Serger and Coverstitch Machine
Bernette Funlock B48 Serger and Coverstitch Machine
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Product Information
bernette (BERNINA)
bernette 48 Funlock
(b48)
Master professional seam construction, edge finishing, and coverstitching in a single versatile machine with the bernette 48 Funlock! Engineered for garment makers, activewear designers, and home decor crafters, the b48 Funlock features 23 built-in stitch patterns—including 15 overlock stitches, 3 coverstitches, 4 combo stitches, and 1 chain stitch. Powered by a high-speed engine reaching up to 1,300 stitches per minute, this 5-thread combo serger incorporates color-coded lay-in threading, precision differential feed, an upper looper converter, and an integrated rolled hem lever. Complete with bright LED workspace lighting, a large cut-off bin, and seamless conversion between serging and coverstitching, the b48 Funlock brings professional factory finishes into your home studio.
Includes 15 overlock stitches, 3 coverstitches, 4 combo stitches, and 1 chain stitch for total construction and finishing versatility.
Streamlined design and dedicated coverstitch inserts make transitioning between overlock seaming and professional hemming straightforward.
Visual color-guided pathways and lay-in tension disks simplify 5-thread setup from spool to needles.
Fine-tunes fabric movement via an adjustable dial ratio to eliminate knit puckering or stretch, driving up to 1,300 stitches per minute.
23 Stitch Configurations
23 Built-In 2-, 3-, 4-, and 5-Thread Stitch Patterns
Enjoy complete flexibility across 23 built-in stitch patterns, including 15 overlock stitches, 3 coverstitches, 4 combo stitches, and 1 chain stitch. Tackle everything from narrow edge finishes on sheer silk to durable 5-thread safety seams on heavy denim.
Frustration-Free Setup
Color-Coded Lay-In Threading Pathways
Thread your combo serger quickly and accurately without frustration. Clear color-coded markings guide each of your five thread lines from the spool stand through lay-in tension disks straight to the looper and needle eyes.
Flawless Fabric Control
Precision Differential Feed System
Maintain flawless control over fabric movement under the foot. Turning the differential feed dial adjusts the front-to-rear feed dog ratio to prevent wavy, stretched-out seams on knits and puckering on lightweight wovens.
Seam Density Control
Adjustable Stitch Length Dial Control
Fine-tune seam density up to a maximum stitch length of 4mm. Select shorter stitch lengths for dense, secure seam construction or longer lengths for decorative finishing and flexible stretch seams.
Eliminate Seam Bulk
Precision Cutting Width Adjustment Dial
Control exactly how much fabric margin is trimmed during overlock seaming. Adjusting the cutting width dial matches seam allowances (3mm to 7mm for overlock, up to 10mm for combo stitches) to eliminate seam bulk.
Instant Hem Switch
Integrated Rolled Hem Selection Lever
Switch from standard overlock stitching to a delicate 1.5mm rolled hem instantly without changing stitch plates. Simply slide the integrated lever to roll sheer fabric edges cleanly on chiffon, scarves, and napkins.
2-Thread Overlocking
Upper Looper Converter for 2-Thread Serging
Convert your machine for delicate 2-thread overlocking using the included upper looper converter attachment. Engaging the converter disables upper looper threading to produce flat, un-bulky edge finishes on fine materials.
One Machine, Two Jobs
Seamless Serging to Coverstitch Transition
Move from seam overlocking to professional coverstitch hemming effortlessly. Thoughtful design details, dedicated coverstitch components, and accessible adjustments keep your workflow organized in one machine.
Stay Organized
Dual-Zone Accessory Storage & Cut-Off Bin
Keep essential threading tools organized directly inside the front looper cover. Additional accessories stay organized in a separate storage box, while an included large cut-off bin catches fabric trimmings as you sew.
Key Features
- 23 Built-In Stitch Patterns: 15 overlock stitches + 3 coverstitches (2.5mm & 5.6mm) + 4 combo stitches (3–10mm) + 1 chain stitch.
- High-Speed 1,300 SPM Engine: Fast and reliable motor performance for rapid garment assembly.
- 5-Thread Capacity: Supports 2-, 3-, 4-, and 5-thread overlock, coverstitch, and safety combo configurations.
- Color-Coded Lay-In Threading: Visual color pathways paired with lay-in tension disks and lower looper threader.
- Differential Feed System: Prevents wavy knit seams and fabric puckering while enabling custom gathering.
- Variable Stitch Parameters: Adjustable stitch length (up to 4mm) and cutting width (3mm to 7mm overlock).
- Integrated Rolled Hem Lever: Slide-action lever converts machine to 1.5mm rolled hem mode without plate swaps.
- Upper Looper Converter Included: Enables 2-thread flatlock and lightweight overlock finishing.
- 3.43" Work Area with LED Lighting: Focused daylight LED lighting illuminates the needle and cutting zone.
- 7-Step Presser Foot Pressure Adjustment: Fine-tune downward presser foot force across 7 pressure settings.
- Under-Drive Knife Mechanism: Lower knife drive provides smooth, powerful fabric trimming action.
- Snap-On Cut-Off Bin & Safety Switch: Collects fabric trimmings and automatically disables motor when looper cover is open.
- Retractable Telescopic Thread Stand: Folds flush for compact storage and supports up to 5 thread spools.
Included Accessories
- Standard Presser Foot & Coverstitch Inserts: Standard Overlock Presser Foot, Cover/Chainstitch Insert.
- Looper Attachments & Trimmer Hardware: Upper Looper Converter, Spare Upper Knife, Manual Needle Threader/Inserter, Tweezers.
- Spool Management Set (5-Thread Setup): 5 × Spool Nets, 5 × Spool Caps, 5 × Spool Stabilizers.
- Maintenance Tools & Storage: Large Screwdriver, Small Allen Screwdriver, Machine Oiler, Cleaning Brush, ELx705 Needle Set.
- Machine Attachments & Storage: Large Cut-Off Waste Bin, Protective Dust Cover, Built-In Looper Cover Tool Storage, Accessory Box.
bernette (BERNINA)
bernette 48 Funlock (b48) — Full Details
| General Specifications | |
| Machine Type | 2-, 3-, 4-, and 5-Thread Overlock & Coverstitch Combo Serger |
| Machine Dimensions | 3.43" Work Area Right of Needle |
| Maximum Sewing Speed | 1,300 Stitches Per Minute (SPM) |
| Lighting System | Daylight LED Workspace Lighting |
| Safety System | Built-In Safety Switch Disables Motor When Looper Cover Opens |
| Thread Antenna | Retractable Telescopic 5-Spool Thread Stand |
| Serging & Coverstitch Specifications | |
| Stitch Configurations | 23 Built-In Stitches (15 Overlock, 3 Coverstitch, 4 Combo Stitches, 1 Chain Stitch) |
| Seam Width Parameters | Overlock Width 3–7mm / Coverstitch Width 2.5mm & 5.6mm / Combo Width 3–10mm / Rolled Hem 1.5mm |
| Maximum Stitch Length | 4.0mm Maximum Stitch Length |
| Feeding & Trimming | Differential Feed Ratio Dial & Variable Cutting Width Adjustment Dial |
| Looper System | Color-Coded Lay-In Pathways with Lower Looper Assister & Upper Looper Converter |
| Presser Foot Clearance & Pressure | 4.5mm Foot Lift Clearance with 7-Step Manual Pressure Regulator |
| Needle System | Up to 5 Needles Capacity (ELx705 Industrial Serger Needle System) |
| Waste Management | Snap-On Large Cut-Off Scrap Bin Included |
bernette Limited Warranty
Every bernette machine is backed by a comprehensive limited warranty, giving you peace of mind with every stitch. bernette, a BERNINA brand, stands behind its machines with dedicated support for quality and craftsmanship.
- 2 Years — Mechanical & Electrical Components: Full coverage on manufacturing defects in parts and workmanship for the machine's mechanical and electrical systems.
- 1 Year — Labor & Adjustments: Authorized service center labor costs for covered repairs within the first year of ownership.
Warranty service must be performed by an authorized bernette dealer or service center. The warranty covers defects in materials and workmanship under normal use and does not cover damage resulting from misuse, accident, or unauthorized modification. Please retain your original proof of purchase.
Contact Sewitonline for warranty service assistance and authorized repair referrals.
Why Buy From Us
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- Real Support When You Need It — call us first. Our techs and education specialists solve a lot over video, find you a local repair shop, or walk you through shipping it back. Just keep your box.
- Warranty Valid at Any Authorized Dealer — your coverage travels with you. Take your machine anywhere for service, no questions asked.
Plus, every machine purchase includes access to our full education library — see the Education tab.
What Education Is Included
Every machine purchase includes access to our full education library:
- 🪡 Sew What's Possible Challenge — start sewing real projects fast.
- 📚 Beyond The Basics — level up your technique.
- 🧰 Machine Maintenance Course — keep your machine running right.
- 🏆 From Box to Confidence — sewing the same day it arrives.
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