Black+Decker Corded Electric String Trimmers Compared: Which Model Fits Your Yard?

Best for
Mid-sized yards requiring wheeled edging stability

Best for
Operators wanting push-button line control

Best for
Small yards needing lightweight routine trimming

Serving as the agile entry point in the brand’s corded lineup, the BLACK+DECKER String Trimmer and Weed Wacker is built for straightforward, manageable yard work. Operating on a durable 4-amp electric motor, this model spins a 13-inch cutting swath that cuts clean paths through everyday lawn turf and common garden weeds. The black and decker BEST935 model focuses on user comfort, featuring an integrated auxiliary handle that gives you balanced two-handed control during prolonged cleanup sessions.

At an overall weight of 2.7 kg, this tool minimizes physical strain, making it ideal for townhouse owners, small suburban lots, and elderly gardeners who want a dependable tool that is easy to carry. The head quickly converts from standard horizontal trimming to vertical edging, letting you define borders along flowerbeds and fences. However, because it lacks a dedicated guide wheel and relies on a modest 4-amp motor, it gives way to higher-amperage options like the BESTA510 when confronting woody overgrowth or extensive curbside edging.

The unit comes packaged with one pre-wound AF-100 spool and is backed by a 2-year limited warranty. Its automatic feed system relies on centrifugal force to advance line as needed, preventing the interruptions associated with manual line indexing. For standard grass maintenance on compact properties, it delivers essential cutting capability in an approachable form factor.

• Durable 4-amp motor engineered for everyday residential trimming
• 13-inch cutting swath with automatic line feed technology
• Built-in auxiliary handle for balanced two-handed operation
• Includes one factory AF-100 replacement spool and carries a 2-year limited warranty

Best for
Dense overgrowth and heavy yard borders

When stubborn weeds and sprawling borders demand heavier output, the BLACK+DECKER Weed Wacker with Auto Feed steps up the performance tier. Driven by a 6.5 amp corded string trimmer motor and the brand’s proprietary POWERDRIVE Transmission, this black and decker BESTA510 tool spins at 8,000 RPM. The gear-reduction transmission multiplies torque at the cutting line, allowing this black and decker electric weed eater to power through thick weeds without bogging down.

A central highlight of this model is its 2-in-1 design with an integrated wheeled edge guide. By rotating the shaft, you convert the tool from a standard 14-inch grass trimmer into a dedicated wheeled edger. The wheel rolls directly along concrete sidewalks, curbs, and patio pavers, supporting the tool’s 6.3-pound chassis while creating uniform trench lines. An adjustable auxiliary handle and telescoping height positions let you tailor the machine to your posture, while an integrated cord retention system prevents the power cord from unplugging during sudden tugs.

The Automatic Feed Spool (AFS) system continuously feeds line as wear occurs, eliminating the need to bump the head against the turf. This model suits homeowners with medium-sized lots that feature extensive hardscaping and dense perimeter growth. However, because line feeds automatically every time the motor starts, operators who prefer total personal control over line release may find it gives way to the push-button BESTE620.

• High-torque 6.5-amp motor with POWERDRIVE Transmission running at 8,000 RPM
• 14-inch cut path for rapid coverage across open lawn areas
• Wheeled edge guide with rotating shaft for quick conversion to edger
• Automatic Feed Spool mechanism paired with a secure cord retention system

The BLACK+DECKER String Trimmer combines heavy-duty cutting capability with precise line management. Known by model number BESTE620, this black and decker 2-in-1 trimmer edger features the brand’s EASYFEED push-button system. Instead of relying on centrifugal force or ground bumping to advance monofilament, you simply press an ergonomic button on the handle to feed out fresh line instantly whenever you require it.

Mechanically, the black and decker BESTE620 matches the power of the BESTA510, utilizing a 6.5-amp motor and POWERDRIVE Transmission to sweep a 14-inch cutting path through tough grass and dense weeds. Despite this identical power output, the BESTE620 weighs in at just 5.3 pounds, shaving a full pound off the BESTA510 for improved maneuverability. It features an adjustable handle, customizable height settings, a cord retention hook, and a wheeled edge guide that engages when you rotate the shaft for bordering work.

This model is ideal for property owners who find automatic spool systems waste line by feeding unnecessarily during frequent starts and stops. With EASYFEED, you dictate exactly when new string advances, extending the life of your spool. For users who prefer a completely automated, hands-off feed experience without touching a button, this trimmer naturally gives way back to the auto-feeding BESTA510.

• Push-button EASYFEED system advances line without bumping
• Robust 6.5-amp motor paired with high-torque POWERDRIVE Transmission
• 14-inch cutting width with rotating shaft and wheeled edge guide
• Lightweight 5.3-pound construction with adjustable handle and height settings

Providing a balanced middle ground in motor sizing, the BLACK+DECKER String Trimmer Edger delivers dependable utility for medium yards. Operating on a 5-amp electric motor spinning at 7,000 RPM, the black and decker ST8600 produces plenty of cutting force while remaining manageable for routine trimming. It incorporates the POWERDRIVE Transmission to channel mechanical torque directly to the cutting head, ensuring steady speed through thick patches of grass.

Equipped with a 13-inch trimming radius, the ST8600 navigates tight corners and garden beds more easily than 14-inch models while clearing more turf per pass than compact edgers. It quickly converts between an open trimmer and a wheeled walk-behind edger, utilizing an edge guide wheel to steady the tool along driveways and stone borders. Weighing 5.4 pounds, the tool includes adjustable height positions and ergonomic handles fitted with premium micro-texture grips for a secure hold.

Line advancement is handled by the brand’s Automatic Spool Feed technology, which automatically draws fresh line from the spool as the tip wears down. This trimmer suits homeowners seeking more power and wheeled edging precision than the 4-amp BEST935 offers, without stepping up to the wider chassis of 14-inch machines. For properties with expansive fences or dense brambles, this model gives way to the 6.5-amp units. If you are also evaluating cordless alternatives for larger grounds, you can see how battery power compares in our black and decker 40 volt string trimmer breakdown.

• Balanced 5-amp motor delivering 7,000 RPM cutting speed
• POWERDRIVE Transmission for increased torque at the string
• 13-inch cutting swath with Automatic Spool Feed operation
• Wheeled edge guide with adjustable handle and micro-texture grips

Best for
High-volume trimming requiring extra line spools

Keeping an electric trimmer operating at peak efficiency requires a steady supply of replacement monofilament, and the 10 Pack Weed Eater String Compatible offers an all-in-one replenishment package. Manufactured by Eventronic, this aftermarket bundle contains eight pre-wound replacement spools, two RC100P spool cap covers, and two replacement springs. It serves as a direct alternative to the standard black and decker AF-100 replacement spool, fitting models like the ST8600, BESTA510, and numerous legacy trimmers.

Each spool holds 30 feet of 0.065-inch diameter line, delivering 240 feet of total string across the eight spools. The string is constructed from an upgraded nylon polyamide material engineered with a tensile strength exceeding 100 pounds. This pliable construction allows the line to flex and cushion upon striking stone pavers, concrete foundations, and chain-link fences, improving cutting efficiency and reducing line breakage during aggressive edging sessions.

Operating via centrifugal force, these spools feed smoothly through automatic feed spool heads. The inclusion of two replacement cap covers and springs provides crucial insurance against lost or worn parts after seasons of heavy scraping against sidewalks. While ideal for cost-conscious homeowners with extensive bordering that consumes string rapidly, this third-party kit gives way to genuine Black+Decker spools for buyers who prefer original equipment manufacturer parts.

• Eight factory-wound spools totaling 240 feet of 0.065-inch line
• Includes two RC100P spool cap covers and two replacement springs
• Durable nylon polyamide construction with over 100 pounds tensile strength
• Centrifugal automatic feed design compatible with AF-100 trimmer heads

Best for
Trimmer owners demanding genuine factory line

For gardeners who prefer sticking strictly to original equipment, the BLACK+DECKER Weed Eater String three-pack provides authentic factory components. Listed under model number AF-100-32P (and AF1003ZP), this multipack contains three 30-foot factory-wound spools of genuine 0.065-inch monofilament line. Because they are wound by the original tool manufacturer, these spools guarantee precise tension and eliminate the binding or uneven unraveling that can occur with hand-wound spools.

The spools utilize centrifugal force to smoothly advance line through the tool’s Auto Feed System (AFS), preventing sudden hitches or line jams during active trimming. The packaging specifies broad compatibility across the manufacturer’s corded and cordless lineup, fitting tools such as the BESTA510, BESTE620, and ST8600. The entire 3-pack weighs 4.64 ounces, making it easy to store in a workshop cabinet or tool shed.

Backed by a 2-year limited warranty, this OEM package suits users who want guaranteed fit, factory reliability, and hassle-free installation. It provides peace of mind that the spool’s dimensions, eyelet clearance, and line thickness match the internal tolerances of your trimmer head exactly. However, for users seeking extra bulk spools or those in need of replacement cap covers and springs, this pack gives way to comprehensive aftermarket sets.

• Genuine OEM authentic factory-wound replacement line
• Includes three 30-foot spools of 0.065-inch diameter line
• Utilizes centrifugal force for smooth, hands-free automatic line feeding
• Compatible across standard AFS trimmer models and backed by a 2-year warranty