Bosch 18V Brushless Top-Handle Jig Saw (GST 18V-125 B)
Modern brushless speed and endurance delivering up to 3,500 SPM. Features a slim grip perimeter, enhanced dust blower, and robust die-cast shoe.
- Max Wood Cut: 125 mm
- Max Steel Cut: 10 mm
- Stroke Speed: 0–3,500 SPM
- Bare Tool Weight: 1.9 kg
Browse compatible T-shank blades for wood, metal and plastics →
View official Bosch battery packs and dual-voltage rapid chargers →
Key Performance Highlights
- 125 mmMax Wood Cut
- 0–3,500 SPMStroke Speed
- 26 mmStroke Length
- Top Handle (D-Handle)Grip Style
Engineering Strengths & Performance Advantages
Advantage 1
High-speed brushless motor delivers up to 3,500 SPM for rapid cross-cutting and panel ripping.
Advantage 2
Slim ergonomic barrel-arch handle with rubberized vibration dampening.
Advantage 3
Heavy-duty cast aluminum baseplate with bevel detents up to 45°.
Advantage 4
Tool-less SDS blade clamping system.
Workshop Checklist & Buying Advice
- Bare Tool designation: On merchant listings like Amazon, "Bare Tool" indicates the package includes only the jigsaw itself. Battery packs and charger are sold separately or bundled in kit versions.
- Universal T-Shank: This tool utilizes standard universal T-shank blades. Older U-shank or universal-hole blades are not recommended.
- Dust collection: For indoor carpentry and cabinetry remodeling, connect an external 1-1/4" vacuum hose adapter to minimize airborne dust.
Workshop Performance Scorecard & Benchmark Ratings
Standardized evaluation measuring blade guide rigidity, vibration dampening, and sustained cutting cadence.
- Cutting Precision & Guide Rigidity9.3 / 10
Square 90° verticality retention and minimal lateral blade deflection in thick timber.
- Vibration Damping & Work Ergonomics9.0 / 10
Dynamic counterbalance control minimizing operator hand fatigue during continuous runs.
- Cutting Cadence & Motor Torque9.5 / 10
Aggressive feed rate through dense hardwoods without speed stalling.
- Cutline Visibility & Dust Clearance9.5 / 10
Integrated blower effectiveness and illumination along marked cut lines.
- Tool-Free Blade Clamp & Bevel Base8.9 / 10
Keyless hot blade ejection mechanism and rigid cast footplate bevel detents.
Orbital Pendulum Dial Guide: Matching Positions 0 to 3 to Your Cut
Orbital pendulum action drives the blade forward on the upstroke and retracts it on the downstroke. Dialing the right setting eliminates tear-out, blade breakage, and overheating.
Position 0: Straight Vertical Reciprocation (No Orbital)
Zero tear-out & dense structural materialsSheet steel, aluminum plate, PVC conduit, acrylic glass, double-sided melamine, and tight radius scrolling.
Position 1: Low Orbital Thrust
Dense hardwoods & 45° bevel cutsWhite oak, maple, butcher block countertops, and 45° miter bevels to prevent lateral blade wander.
Position 2: Medium Orbital Setting
Everyday softwood & plywood standardPine, fir, CDX plywood, OSB subflooring, and general woodworking balancing speed with edge quality.
Position 3: Maximum Orbital Action
High-speed demolition & rough framingStructural 2x4 framing lumber, pressure-treated posts, garden timber, and rough cuts where chip-out does not matter.
Everything You Need to Start Cutting with this Jigsaw
To maximize precision and runtime right out of the box, our woodworking editors recommend pairing this saw with contractor-grade blades and matching power accessories.
Bosch 18V Brushless Top-Handle Jig Saw (GST 18V-125 B)
Modern brushless speed and endurance delivering up to 3,500 SPM. Features a slim grip perimeter, enhanced dust blower, and robust die-cast shoe.
Bosch Robust Line Wood and Metal (10-Piece Set)
Heavy-duty shockproof case containing premium Clean for Wood, Speed for Wood, and Basic for Metal blades.
Bosch CORE18V 4.0 Ah Compact Battery (GBA18V40)
Genuine Bosch 18V System (AMPShare) lithium-ion battery pack with 4.0 Ah capacity and cell thermal protection.
Greenworks GD24JSK2
Greenworks
- Power: 24V Lithium-Ion
- Max Wood: 80 mm
- Speed: Up to 3,000 SPM
WORX WX542.9
WORX
- Power: 18V Lithium-Ion
- Max Wood: 120 mm
- Speed: 0–3,500 SPM
Bosch PST 650
Bosch
- Power: 240V Mains / 500W (UK 3-Pin Plug)
- Max Wood: 65 mm
- Speed: 3,100 SPM
Bosch 18V Brushless Top-Handle Jig Saw (GST 18V-125 B): Workshop Positioning & Cutting Capabilities
Engineered to excel in architectural millwork and fine curve cutting, the Bosch 18V Brushless Top-Handle Jig Saw (GST 18V-125 B) combines Bosch’s signature reliability with a balanced Top Handle (D-Handle) form factor. Its robust 18V Brushless Lithium-Ion motor delivers controlled reciprocating thrust, giving finish specialists confident guidance across delicate veneers and structural timber alike with the Bosch GST 18V-125 B.
Modern brushless speed and endurance delivering up to 3,500 SPM. Features a slim grip perimeter, enhanced dust blower, and robust die-cast shoe.
With rated cutting capacities reaching 125 mm in construction timber, 10 mm in sheet metal, and 20 mm in non-ferrous metals, the Bosch GST 18V-125 B easily accommodates everything from hardwood worktop sink cutouts to electrical junction box cutouts and architectural trim coping.
Verified Factory Specifications & Physical Dimensions
Below are the verified manufacturer specifications and physical parameters for the Bosch 18V Brushless Top-Handle Jig Saw (GST 18V-125 B):
- Power Platform: 18V Lithium-Ion
- Grip Configuration: Top Handle (D-Handle)
- No-Load Stroke Rate: 0–3,500 SPM
- Stroke Length: 26 mm
- Cutting Capacity in Wood: 125 mm
- Cutting Capacity in Steel: 10 mm
- Cutting Capacity in Aluminum: 20 mm
- Bare Tool Weight: 1.9 kg
- Bevel Range: Positive detents at 0°, 15°, 30°, and 45°
- Blade Shank Standard: Universal keyless T-shank clamp
Motor Architecture & Vibration Damping Dynamics
Bosch engineered the Bosch GST 18V-125 B with a high-torque brushless drive regulated by Constant Response circuitry. This electronic governor maintains consistent stroke cadence even as cutting resistance spikes through hardwood knots. Harmonic vibration dampeners built into the plunger assembly keep hand-arm vibration well below commercial fatigue thresholds.
With its classic bow-handle architecture, the Bosch GST 18V-125 B provides comfortable, upright control ideal for general workshop dimensioning and jobsite framing. A variable-speed trigger with an integrated lock-on button permits steady feed rates without inducing hand cramping on extended sheet cuts.
Shoe Base Engineering, Bevel Accuracy & Cut-Line Clarity
The footplate on the Bosch GST 18V-125 B is cast from rigid alloy with steel inserts to withstand heavy jobsite drops. Tool-free bevel adjustments lock securely at standard 0°, 15°, 30°, and 45° angles. A built-in dust blower keeps the pencil path clear of debris, while the included non-marring sub-base shoe protects pre-finished cabinetry from unsightly scratches.
Keyless Blade Clamp & pendulum action Settings
The Bosch GST 18V-125 B features an intuitive keyless blade clamp engineered for rapid changeovers. Inserting a T-shank blade engages positive mechanical locking with a reassuring tactile click, while the lever-action release ensures safe removal without burning your fingers.
A dedicated 4-position pendulum action switch on the Bosch GST 18V-125 B adjusts the aggressive forward thrust of the blade:
- Setting 0: Vertical reciprocation without orbital swing. Essential for sheet metals, copper tubing, PVC, and chip-free cuts in double-sided melamine veneers.
- Setting 1: Subtle orbital oscillation. Recommended for dense hardwoods like white oak, hard maple, and birch plywood to balance edge smoothness with cut progress.
- Setting 2: Medium pendulum swing. The workhorse setting for general softwood framing (2x4, 2x6) and construction lumber.
- Setting 3: Maximum aggressive orbital thrust. Delivers blistering feed speed for rough dimensioning, timber framing, and demolition work where speed outweighs edge cosmetics.
Frequently Asked Questions About the Bosch GST 18V-125 B
Can I use existing Bosch batteries with the Bosch GST 18V-125 B?
Yes. The Bosch GST 18V-125 B is fully cross-compatible with any standard pack from the Bosch 18V Brushless Lithium-Ion lineup. Whether using compact 2.0 Ah slim packs or high-demand 5.0 Ah extended-runtime batteries, the tool locks on securely without adapters.
Does the Bosch GST 18V-125 B feature low-voltage battery protection?
Yes. Integrated microprocessor monitoring cuts motor power before cells discharge below critical voltage levels, preserving the overall cycle life and health of your 18V Brushless Lithium-Ion lithium-ion packs.
Does the blade clamp accept U-shank blades?
No. Like modern professional jigsaws, the Bosch GST 18V-125 B is engineered specifically for universal T-shank blades. T-shank side tangs provide positive mechanical locking that prevents blade slippage under high orbital loads.