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Silver straight pneumatic die grinder with safety-lock throttle lever and multiple collet inserts

DYNABRADE

DYNABRADE 53781 Straight Die Grinder 0.7 hp 35,000 RPM

SKU CH-RZWH-BZ58D

A 0.7 hp straight pneumatic die grinder reaching 35,000 RPM with a safety-lock throttle and four collet inserts included

  • Delivers 0.7 hp for heavy-duty grinding tasks
  • 35,000 RPM maximum speed enables fast material removal
  • Safety-lock throttle lever prevents accidental start-up
  • Includes four collet inserts for 1/4 in, 3/8 in, 6 mm and 8 mm shanks
  • 1/4 in NPT female air inlet connects to standard shop airlines

Straight Die Grinder 0.7 hp 35000 RPM

The DYNABRADE 53781 is a straight pneumatic die grinder built for heavy-duty material removal. It delivers 0.7 horsepower at a maximum speed of 35000 RPM. The tool accepts 1/4 inch and 6 mm collets for precision grinding, deburring and finishing tasks in metalworking and fabrication shops.

Air consumption and safety-lock throttle

The grinder connects via a 1/4 inch NPT female air inlet for standard shop supply. A safety-lock throttle lever prevents accidental start-up during hose connection or bit changes. The straight body orientation allows controlled access to tight internal surfaces and weld seams.

Four collet inserts included

The bare tool ships with four collet inserts: 1/4 inch (50013), 3/8 inch (50014), 6 mm (50016) and 8 mm (50039). This range lets operators switch between imperial and metric carbide burrs or mounted points without sourcing separate accessories.

How it compares

Measured against everything we stock in Air & Hydraulic Power Tools, at today’s prices. Recalculated every night.

Price $633.99
Pricier than about 90% of the 243 comparable items (median $61.99).

Specifications

Product
Brand nameDYNABRADE

Questions about this item

How do I connect the 1/4 in NPT female air inlet on the 53781, and what step do people often miss?

Thread a 1/4 in NPT male fitting into the inlet, then secure the safety-lock throttle lever before pressurising the line — many users forget to engage the lock and get unexpected spindle rotation.

Which collet inserts from the kit will wear first and need replacement?

The four supplied inserts — 1/4 in (50013), 3/8 in (50014), 6 mm (50016) and 8 mm (50039) — are hardened steel; the smallest 6 mm insert typically sees the highest clamping cycles and should be inspected for run-out first.

At 35,000 RPM what limit appears first during continuous grinding?

The 0.7 hp motor reaches its thermal ceiling before the collet or throttle mechanism, so sustained full-speed work requires periodic cool-down pauses to avoid power drop-off.

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