Description

Key Features

Hybrid Power

Run the sander cordless when a cord gets in the way, then switch to corded operation with the plug it adapter when you want unlimited runtime. That gives you more flexibility on ladders, scaffolding, trim installs, and shop work.

Light One-Hand Control

The compact body, low 2.20 lb tool weight, and Ergo battery layout keep the Festool DTSC 400 cordless delta sander balanced in your hand. That matters when you are sanding overhead, working vertically, or chasing details in tight spots.

Cleaner Finish Work

Efficient dust extraction with the included long-life dust bag, plus compatibility with Festool dust extractors, helps keep fine sanding dust off the surface and out of the air. Cleaner work usually means less rework before finish goes on.

Overview

The Festool DTSC 400 18V cordless delta sander, model 577513, is a compact detail sander built for finish sanding on edges, corners, narrow surfaces, and other places where a larger sander feels clumsy. This is a cordless delta sander designed for detail sanding, finish prep, and close-to-edge work. If you spend time on window frames, door frames, eaves, trim parts, or overhead sanding, this tool solves a real problem: it gives you the control of a small finish sander without tying you to a cord.

What makes this one different is the hybrid setup. You can run it on the included 18V 3.0 Ah Ergo batteries for mobile work, then switch to plug it corded operation when you want continuous runtime indoors or in the shop. Festool built the DTSC 400 to match the performance feel of its corded counterpart, so you are not giving up sanding quality just because you want cordless freedom. The variable no-load speed range of 6,000 to 10,000 RPM gives you room to tune the cut for paint removal, finish sanding, or more delicate surface prep.

The triangular 4 in. x 6 in. sanding pad is the whole point of this tool. It gets into corners and along profiles where a round random orbit sander cannot reach cleanly. The 2 mm sanding stroke is well suited for finish-oriented sanding, where you want control and a consistent surface rather than aggressive stock removal. For painters, remodelers, cabinet installers, and trim carpenters, that means better access and fewer hand-sanding follow-up steps.

Festool also did the ergonomics right here. The Ergo battery layout keeps the cordless delta sander balanced in your hand instead of making it feel tail-heavy. Combined with the light 2.20 lb tool weight, the one-handed form factor is a real advantage on vertical panels, overhead work, and awkward angles. That is not just a comfort feature. Better balance helps you keep the pad flat, which helps the scratch pattern stay even.

Dust control is another big reason people buy into this platform. The included SB-Longlife dust bag handles mobile sanding when you are moving around a jobsite, and the tool can also be paired with a Festool mobile dust extractor for cleaner indoor work. When you are sanding painted trim, varnished frames, or finish surfaces in occupied spaces, cleaner extraction is not a luxury. It helps visibility, cleanup time, and final surface quality.

The removable Protector is a small feature that does a lot of work. It helps protect both the pad and adjacent surfaces when you need to sand right up against an edge without nicking what is next to it. On window sash, installed trim, and finished edges, that saves time and keeps you from creating extra touch-up work. It is exactly the kind of detail that matters more on the job than it does on a spec sheet.

System compatibility is strong if you already run Festool. This kit includes two BP 18 Li 3.0 Ergo I batteries, a TCL 6 rapid charger, the SSH Delta sanding pad, dust bag, Protector, and a Systainer3 for storage and transport. Bluetooth connectivity is built into the system, and Festool also supports corded operation with the plug it mains adapter for users who want both portable and stationary workflow options.

Who should buy it? Anyone doing finish sanding where access, control, and clean results matter more than brute material removal. The Festool DTSC 400 18V cordless delta sander makes the most sense for painters, finish carpenters, remodelers, cabinet and millwork installers, and serious DIY users who care about dust collection and surface quality. If your work lives in corners, along edges, and on installed trim, this tool earns its keep fast.

At a Glance

18V

Battery Platform

6,000-10,000 RPM

No-Load Speed

2 mm

Sanding Stroke

2.20 lbs

Tool Weight

Work Freely on Trim, Frames, and Overhead Details

The biggest advantage here is mobility without losing control. When you are working on installed trim, sanding above shoulder height, or moving around a room, no cord means less fighting the tool and less chance of dragging a hose or cable across finished work.

• 18V power with an ergonomic battery layout for balanced one-hand use
• Up to 30 minutes of runtime at full power from the included battery system
• Especially useful for vertical surfaces, scaffolding, and overhead sanding

Sand Right Up to Adjacent Surfaces

The removable Protector is one of those features that looks simple until it saves a finished edge. If you sand window frames, doors, or trim installed next to another surface, this helps you stay tight to the line without chewing up what is beside it.

• Protector helps shield adjacent surfaces and the pad during close-edge sanding
• Delta pad shape reaches corners and narrow sections that round sanders miss
• Built for paint removal and finish prep on frames, eaves, and detail work

Built for Clean Mobile Finish Sanding

Fine sanding makes a mess fast, especially indoors. The long-life dust bag gives you a self-contained option for punch-list work, while the dust port also fits into a Festool extractor setup when you want better collection for longer sessions.

• Includes SB-Longlife RTS/DTS/ETS dust bag for mobile use
• Dust extraction connection diameter is 1-1/16 in. (27 mm)
• Cleaner surfaces help when you are checking scratch pattern before finish

Complete Kit, Ready to Travel

This is not a stripped-down bare tool. The Plus kit gives you the full working package with batteries, charger, storage, and the sanding accessories needed to put the tool straight into rotation.

• Includes two BP 18 Li 3.0 Ergo I batteries and a TCL 6 rapid charger
• Packed in a Systainer3 for organized storage and easy transport
• Comes with sanding pad, Protector, and reusable dust bag

What’s in the Box

• (1) Festool DTSC 400 cordless delta sander
• (2) BP 18 Li 3.0 Ergo I battery packs
• (1) TCL 6 rapid charger
• (1) SSH Delta sanding pad
• (1) PR DTS-R 100×150 Protector
• (1) SB-Longlife RTS/DTS/ETS dust bag
• (1) Systainer3 SYS3 M 187

Key Specifications

Voltage	18 V
Battery Capacity	3.0 Ah
No-Load Speed	6,000 – 10,000 RPM
Sanding Pad Size	4 in. x 6 in. (100 x 150 mm)
Sanding Stroke	5/64 in. (2 mm)
Dust Port Diameter	1-1/16 in. (27 mm)
Weight	2.20 lbs (1 kg)
Connectivity	Bluetooth
Drive Type	Battery
Made In	Germany

Compatibility

Battery Platform

Runs on Festool 18V Ergo battery packs. This kit includes two BP 18 Li 3.0 Ergo I batteries.

Corded Operation

Supports Festool plug it mains adapter use for continuous corded sanding when cordless runtime is not the priority.

Dust Extraction

Can be used with the included dust bag or paired with a Festool mobile dust extractor through the 27 mm dust connection.

Bluetooth System

Bluetooth technology is part of the tool and battery system for users already invested in compatible Festool cordless accessories and workflow.

Built For

Finish Carpentry Painting Prep Remodeling Window Frames Door Frames Overhead Sanding Vertical Surface Sanding Detail Finish Work

Pro Tip

If you are sanding installed trim or window parts, snap on the Protector before you start instead of after the first close call. On this sander, that small step lets you work tighter to adjacent surfaces and usually saves more touch-up time than you would expect.

Warranty & Support

Covered by Festool’s 3-year Service All-Inclusive warranty.

Tool Nut’s Take

Tool Nut’s Take

Festool DTSC 400 18V cordless delta sander for finish guys who hate hand sanding corners

The Festool DTSC 400 18V cordless delta sander is one of those tools that makes a lot more sense the first day you use it on installed trim, frames, or overhead detail work.

• Who it’s for: Painters, finish carpenters, remodelers, and detail-focused DIY users who need a compact sander for corners, edges, and surface prep in place.
• Why it stands out: Hybrid corded or cordless operation, excellent balance with the Ergo battery, real dust control options, and a Protector that is actually useful instead of gimmicky.
• Worth knowing: This is a finish and detail sanding tool, not a heavy stock-removal machine. Buy it for access, control, and clean edge work, and it will earn its spot fast.

Common Questions

• Is this a cordless-only sander? No. It is a hybrid design that can run cordless on the included 18V batteries or corded with a Festool plug it mains adapter.
• What kind of sanding is the DTSC 400 best for? It is best for detail sanding, edge work, corner access, finish prep, and sanding on vertical or overhead surfaces where a larger sander is harder to control.
• Does it support dust extraction? Yes. It includes a long-life dust bag and can also be used with a Festool mobile dust extractor through the 27 mm dust connection.
• What is the speed range? The no-load speed range is 6,000 to 10,000 RPM.