BLACK+DECKER ST8600 Review 2026 ▷ 6.5-Amp Electric String Trimmer

If your yard has a power outlet within reach and you want zero ongoing fuel or battery expenses, the BLACK+DECKER ST8600 makes a compelling case. This 6.5-amp corded electric trimmer has been a consistent top seller in the category for years — not because it breaks new ground in technology, but because it does exactly what a residential trimmer needs to do, reliably, at a price that undercuts battery alternatives by $60–100. Plug in, work, unplug: no charging schedules, no fuel mixing, no pull-start frustration.

This review covers everything you need to know before buying: who it actually suits, where it performs well, where it hits its limits, and how it stacks up against the Greenworks 21142 and WORX WG163 GT Revolution.

Who the BLACK+DECKER ST8600 Is Best For

The ST8600 is the right tool for a specific homeowner profile. You have a residential yard under a quarter-acre, with outdoor power outlets reachable by a 50–100-foot extension cord. You maintain the lawn weekly or bi-weekly, which means the grass never gets dramatically out of hand. You want a tool that starts immediately and doesn't involve managing charging cycles or fuel. You edge sidewalks and driveways occasionally but don't need a dedicated edger.

It is not the right tool if your property is large enough that running an extension cord becomes genuinely cumbersome — say, over 12,000 square feet with no convenient outlet placement. It is also not the right choice for yards with persistent heavy weed growth, thick brush, or long-neglected sections that need reclamation work rather than maintenance trimming. For those conditions, a 40V or 56V battery trimmer or a gas trimmer delivers the power headroom to handle heavier loads without bogging down.

For the homeowner who fits the profile — suburban lot, weekly maintenance, reliable outlet access — the ST8600 removes every complication that battery and gas trimmers add and delivers capable, consistent performance for years of residential use.

BLACK+DECKER ST8600 Specifications

Specification	Value
Motor	6.5 amps, 120V corded electric
Cutting Width	14 inches
Trimmer Line Diameter	0.065 inch
Line Feed System	Automatic AFS (Auto Feed System)
Shaft Type	Curved
Edger Conversion	Yes — rotating head, includes guide wheel
Weight	5.3 lbs
Power Source	Corded — requires extension cord
Warranty	2-year limited
ASIN	B00004RAXK

The 14-inch cutting width is a practical choice for residential use — wide enough to cover ground efficiently on a typical suburban lot, narrow enough to maneuver precisely around tree rings, garden bed edges, and fence posts without overshooting. The curved shaft is the standard design for homeowner-grade trimmers; it places the cutting head at a natural angle for upright trimming without requiring body position adjustment, and it keeps the trimmer lighter and more maneuverable than straight-shaft designs.

Performance Analysis: Real-World Results

The ST8600 performs most impressively during routine maintenance trimming — the weekly or bi-weekly pass around fence lines, tree rings, garden beds, and foundation plantings that keeps a yard looking finished rather than merely mowed. In this role, the 6.5-amp motor maintains consistent head speed without hesitation on standard residential grass, and the automatic AFS line feed advances line smoothly as it wears down. You simply work; the tool manages its own line length.

The AFS system deserves specific attention because it is one of the most significant quality-of-life differences between trimmer models. Traditional bump-feed trimmers require you to tap the head against the ground to advance line — a simple action that still interrupts your workflow and occasionally fails to advance correctly if the line has fused inside the spool. The automatic feed on the ST8600 monitors line length continuously and advances as needed without any input from you. In a typical trimming session, this means you focus on guiding the trimmer rather than managing it. The main trade-off is that automatic systems use line somewhat faster than manual bump-feed — the AFS advances line proactively rather than only when you request it.

On thicker weeds — dandelions with mature stalks, plantain rosettes, established clover patches — the 6.5-amp motor handles the load without stalling, but a perceptible reduction in head speed is noticeable when the line contacts heavy growth consistently. This is not a failure mode; it is the expected behavior of a 6.5-amp class motor encountering meaningful resistance. The motor recovers immediately when it clears the dense patch and returns to normal speed. For most residential yards maintained weekly, you will rarely push the motor to this point.

The edger conversion is genuinely useful and not an afterthought. Rotating the head 90 degrees and positioning the guide wheel against a sidewalk edge produces a clean, consistent edge line that is adequate for weekly residential maintenance. The guide wheel maintains a consistent depth and prevents the trimmer from drifting into the concrete or away from the edge. Compared to freehand edging with a trimmer at an angle — a technique requiring constant visual monitoring — the ST8600's dedicated edger mode is meaningfully more consistent and less tiring over a full driveway-plus-sidewalk edging session.

Pros and Cons

How It Compares to the Competition

Three corded and cordless alternatives are most commonly cross-shopped with the ST8600. Understanding where each fits helps confirm whether the BLACK+DECKER is the right match for your specific situation.

Model	Power	Cut Width	Line	Weight	Best For
BLACK+DECKER ST8600	6.5A corded	14 in	0.065 in	5.3 lbs	Value, simplicity
Greenworks 21142	5A corded	15 in	0.065 in	5.1 lbs	Wider cut, light use
WORX WG163 GT Revolution	20V battery	12 in	0.065 in	5.5 lbs	Cordless convenience

The Greenworks 21142 offers a 15-inch cutting width versus the ST8600's 14 inches, but runs on a 5-amp motor versus the ST8600's 6.5-amp. In practice this means the Greenworks covers slightly more area per sweep but has less motor headroom when cutting through resistance. For purely maintenance trimming on normal residential grass, both perform comparably. The ST8600 wins when the lawn occasionally gets away from you or growth is thicker than average.

The WORX WG163 GT Revolution is the cordless alternative for homeowners who prioritize freedom from the extension cord. Its 20V battery eliminates cord management entirely, and the 3-in-1 design (trimmer, edger, mini-mower mode) provides more versatility. The trade-off: 12-inch cutting width is narrower, requiring more passes on larger sections, and the battery adds ongoing replacement cost. For a yard where cord management is genuinely cumbersome, the WORX is worth the premium. For yards where an extension cord is a non-issue, the ST8600's larger motor and lower total cost make it the better value.

Maintenance Tips

The ST8600 requires minimal maintenance compared to gas trimmers, but a few simple practices extend its life and keep performance consistent.

Line management: The most common issue users encounter is the AFS advancing line faster than expected when trimming near hard surfaces like concrete curbs, brick walls, or gravel. Each contact with a hard surface abrades the line and can trigger an advance. To minimize unnecessary line consumption near hard surfaces, slow your working pace and keep the trimmer head slightly further from the contact surface — let the line tips do the work rather than driving the head into the surface. This extends spool life significantly in edge-heavy yards.

Cleaning after use: Grass clippings and sap accumulate around the cutting head and in the air vents of the motor housing. After each use, brush or wipe debris from the head area and blow out the vents with compressed air or a soft brush. Accumulated debris in the vents restricts airflow and causes the motor to run hotter than designed. For corded electric motors, heat is the primary cause of accelerated wear.

Cord care: Inspect your extension cord before each use for cuts, abrasion, or damage to the insulation. A damaged outdoor cord is a safety hazard and can also reduce power delivery to the motor. Store cords loosely coiled — tight coiling around a nail or hook stresses the insulation at the bend points over time. Replace any cord with cracked or damaged insulation immediately.

Off-season storage: For winter storage, clean the trimmer thoroughly, remove the spool and store it separately in a dry location (cold and humidity can affect the line's flexibility), and hang or shelve the trimmer in a garage or shed where it won't be knocked over or have heavy objects placed on the curved shaft. The motor requires no seasonal maintenance — there is no carburator to drain, no oil to change, no fuel to stabilize. Simply clean and store.

Frequently Asked Questions

Frequently Asked Questions

What size extension cord do I need for the BLACK+DECKER ST8600?

The ST8600 draws 6.5 amps at 120V, which means it needs a properly rated outdoor extension cord. For runs up to 50 feet, a 16-gauge (AWG 16) outdoor-rated cord is sufficient. For runs of 50 to 100 feet, step up to 14-gauge to avoid voltage drop that reduces motor performance. Never use an indoor extension cord outdoors — these lack the weatherproofing and can create safety hazards. A 100-foot 14-gauge outdoor cord covers most residential yards and costs around $25–35. Look for cords rated for outdoor use and labeled with a 'W' (weather-resistant) designation. Avoid cords thinner than 16-gauge at any length, as they will cause the motor to run hot and underperform.

How do I replace the trimmer line on the BLACK+DECKER ST8600?

The ST8600 uses an automatic AFS (Auto Feed System) spool. When the line runs short, it advances automatically as you work — no bump-feeding required. When the spool is completely empty, you have two options: buy a pre-wound replacement spool (BLACK+DECKER part AF-100, widely available at home improvement stores for $5–8), or rewind the spool yourself with 0.065-inch diameter trimmer line. To rewind manually: remove the spool cap by pressing the side tabs, pull out the old spool, wind the line in the direction indicated by the arrow on the spool, thread both line ends through the exit guides, and replace the cap. The pre-wound spool is faster and eliminates the chance of loading errors, making it the preferred option for most homeowners.

Can the BLACK+DECKER ST8600 be converted to an edger?

Yes. The ST8600 includes a rotating head that allows conversion to inline edger mode. To use it as an edger, rotate the cutting head 90 degrees so the trimmer line spins vertically rather than horizontally. A small guide wheel on the unit helps maintain consistent depth along sidewalk and driveway edges. The result is a clean, defined edge line — adequate for weekly maintenance edging on residential properties. For the sharpest possible edge definition, a dedicated lawn edger with a metal blade produces cleaner lines, but the ST8600's edger mode eliminates the need for a separate tool for homeowners who edge every 1–2 weeks.

Is the BLACK+DECKER ST8600 powerful enough for thick weeds?

The ST8600 handles standard residential weeds reliably — dandelions, plantain, clover, and most garden-perimeter weeds up to about 3/8-inch stem diameter. Its 6.5-amp motor with 0.065-inch line will slow noticeably when hitting very thick, woody weed stems or heavy growth that has gone uncut for several weeks. In those conditions, the automatic line feed may also advance line faster than normal, consuming the spool more quickly. For properties with persistent heavy weed growth or overgrown sections, a 40V or 56V battery trimmer, or a gas trimmer, delivers more consistent motor speed under load. The ST8600 excels as a maintenance trimmer — weekly cuts around fences, beds, and tree rings — rather than as a reclamation tool.

How long does the BLACK+DECKER ST8600 warranty last?

BLACK+DECKER backs the ST8600 with a 2-year limited warranty covering defects in materials and workmanship under normal use and conditions. The warranty covers repair or replacement at BLACK+DECKER's discretion. It does not cover damage from misuse, accidents, commercial use, or normal wear items like trimmer line and spool. To register your warranty, visit the BLACK+DECKER website within 30 days of purchase with your purchase receipt. BLACK+DECKER's service network includes authorized repair centers in most major cities; check their website locator for the nearest location. For a corded electric tool, the 2-year coverage is standard in the category and appropriate given that corded motors have fewer failure points than gas engines or battery management systems.