FEIN 72232560090 Corded 1/4″ Die Grinder 8,500 RPM | GSZ 4-90 EL

The FEIN GSZ 4-90 EL Die Grinder is a compact, long-neck grinder engineered for stainless steel work and hard-to-reach grinding and polishing tasks. Operating at variable speeds up to 8,500 RPM, this corded unit delivers fine control and consistent performance. Its elongated 8-1/4″ [210 mm] neck allows users to reach deep into structures like pipe interiors, making it highly suitable for finish work in tight spaces. Equipped with innovative collet technology, protective motor features, and a replaceable rubber casing, this model is purpose-built for tradespeople needing accuracy and durability in metal fabrication and surface prep.

Designed to minimize operator fatigue while maximizing access and tool protection, this die grinder is ideal for jobs requiring finesse in detailed grinding or surface smoothing. The ability to control RPM and swap out tool attachments quickly makes it a reliable option for workshops and field applications alike, especially when dealing with stainless steel, metal tubing, or difficult contours.

FEIN Corded 1/4″ Die Grinder, GSZ 4-90 EL At a Glance

Long, narrow neck (210 mm / 8-1/4″): Enables deep access inside pipes or confined shapes, essential for internal grinding tasks
Innovative collet design: Includes a wrap-around collar that protects the workpiece and prevents wrench slippage, reducing tool change downtime
Variable speed control: Adjusts from 3,500 to 8,500 RPM to suit grinding, deburring, or polishing with various attachments
Dust-protected motor and electronics: Ensures longevity when used on stainless steel or metal surfaces where fine dust is prevalent
Replaceable rubber neck casing: Maintains a safe, insulated grip over time and adds impact protection in tight setups.

Markets

Metal Fabrication Shops: Offers excellent access for weld seam grinding and stainless steel finishing, especially in tubular or enclosed sections
Plumbing and Pipe Fitters: Ideal for grinding and polishing the interior of pipes and tight elbows with control and reach
Municipal Maintenance Crews: Useful in maintenance jobs involving confined spaces or infrastructure components like handrails, grates, or piping
Automotive & Mechanical Repair: Helps in polishing or deburring engine components, brackets, and tight chassis corners
Industrial Equipment Manufacturers: Supports fabrication and finishing during assembly where precise grinding is required
Construction Trades: Practical for surface preparation or cleanup in areas not accessible with bulkier grinders
Educational Trade Schools: Suitable for training students in precision grinding, surface prep, and tool safety

Why The FEIN GSZ 4-90 EL Die Grinder Works for Industry. Trades that rely on high-precision grinding in hard-to-reach places will benefit from the GSZ 4-90 EL’s long-neck design and compact build. Metalworkers and stainless steel fabricators can work with confidence knowing this unit is dust-protected and tailored for surface quality. Utility workers and municipal maintenance crews will find its extended reach beneficial in enclosed or curved spaces. The variable speed range supports polishing and finishing without damaging delicate materials, which is crucial for professionals in fabrication, pipe fitting, and mechanical repair.

FEIN 72232560090 Die Grinder 8,500 rpm|GSZ 4-90 EL Features

Long, narrow neck and a max. width of 8-1/4 in [210 mm] allows tool to reach deep into workpieces (e.g. grinding inside pipes).
Innovative collets with wrap around collar for workpiece protection and to prevent the wrench slipping when changing tools.
Variable speed allows different tools to be used.
Motor and electronics protected against metal dust.
Replaceable rubber neck bearing casing.

FEIN 72232560090 Die Grinder 8,500 rpm|GSZ 4-90 EL Includes

Spanner SW17
1 collet 1/4 in [6 mm]
Spanner size 3

FEIN 72232560090 Die Grinder 8,500 rpm|GSZ 4-90 EL Specifications

Power Consumption: 350 W
Power Output: 170 W
No Load Speed: 3,500 – 8,500 RPM
Max Polishing Disc Diameter: 2″ (50 mm)
Max Grinding Wheel Diameter: 3/4″ (20 mm)
Max Collet Size: 1/4″ (6 mm)
Max Milling Cutter Diameter: 1/2″ (12 mm)
Cord Length: 16.4 ft (5 m)
Weight: 3.31 lbs (1.50 kg)

Why Professionals Choose the FEIN Corded 1/4″ Die Grinder 8,500 RPM | GSZ 4-90 EL

The FEIN GSZ 4-90 EL is often referred to in shops as a “go-to” for long-reach light grinding—especially in stainless applications where finish quality matters. Users appreciate its slim profile, calling it a “neck grinder” or “pipe grinder” for its ability to fit inside tight tubes or framework. Its variable RPMs are a solid match for surface prep and polishing without overheating the workpiece. This grinder is known in the field for being a dust-tough, lightweight tool that handles awkward angles where a standard die grinder can’t fit. When work needs to be clean and precise, especially in stainless or detailed assemblies, this tool is one that gets the job done.