TONE Electric Nutrunner (GSR Series)
The TONE GSR Series are wired electric nutrunners with an integrated torque controller and lever socket drive — built for structural steel, civil, and infrastructure bolting from 150 to 2,100 N·m. Three variants are available: standard T-models for general use, WT double-switch models requiring two-hand activation for added operator safety, and A Shear Runner models featuring a high-rigidity aluminium body motor for enhanced output and workability. All models double-insulated and Digitorqon compatible. Supplied with lever socket and metal case as standard.
More Information
The TONE GSR Series delivers precision lever-socket torque control from 150 to 2,100 N·m — integrated controller, automatic shut-off, and the consistent accuracy that structural and civil bolting demands. Three variants cover standard, double-switch safety, and aluminium-body Shear Runner configurations.
Why the GSR Series
The GSR Series shares the same core design philosophy as the GST Series — torque controller built directly into the tool body, automatic shut-off at the preset torque value, and ±5% repeat accuracy — in a lever socket format that suits the MRU, HRU, and VRU socket ranges. The full range covers structural steel from M16 through M30 high-tension bolts.
Three model variants are available. The standard T-models (GSR31T through GSR211T) are the core workhorse range with single-trigger operation across five torque tiers. The WT double-switch models (GSR81WT/82WT) require simultaneous two-hand switch activation to run the tool — both the trigger and the sub-switch must be pressed, and the switch positions are designed so that one hand alone cannot engage both — preventing finger crush injuries at the reaction bar. The A Shear Runner models (GSR81A/82A) feature a high-rigidity aluminium body motor delivering higher no-load speed and output power at the 350–800 N·m tier, suited to demanding continuous-use applications.
All models accept the full range of optional MRU, HRU, and VRU lever sockets, and are compatible with the optional DTM-series Digitorqon for digital torque verification.
Key Features
- Integrated torque controller — no external control box; clean setup on site
- Automatic shut-off — stops precisely at preset torque, consistent results regardless of operator
- Lever socket drive — MRU, HRU, and VRU types across the range; wide socket compatibility
- Bidirectional operation — full torque control for both tightening and loosening
- ±5% repeat tightening accuracy — under consistent conditions across all models
- Double-insulated construction — operator safety across the full series
- Digitorqon compatible — supports optional DTM-series digital torque verification
- Double-switch safety variant (WT) — requires simultaneous two-hand activation; prevents reaction bar finger injuries
- Shear Runner aluminium body variant (A) — high-rigidity aluminium body motor; higher output speed and power for demanding applications
Typical Applications
- Structural steelwork and high-tension bolt installation (M16–M30)
- Bridge and civil infrastructure construction
- Road construction and barrier systems
- Rail and railway infrastructure
- Industrial plant maintenance and assembly
Range Overview
Standard T-Models — Single Trigger
| Models | Torque Range | Drive Type |
|---|---|---|
| GSR31T / GSR32T | 150 – 300 N·m | Lever socket MRU |
| GSR51T / GSR52T | 200 – 500 N·m | Lever socket MRU |
| GSR81T / GSR82T | 350 – 800 N·m | Lever socket MRU |
| GSR121T / GSR122T | 600 – 1,200 N·m | Lever socket HRU |
| GSR211T / GSR212T | 1,000 – 2,100 N·m | Lever socket VRU |
Double-Switch Safety Variant — Two-Hand Activation Required
| Models | Torque Range | Drive Type |
|---|---|---|
| GSR81WT / GSR82WT | 350 – 800 N·m | Lever socket MRU |
Shear Runner — High-Rigidity Aluminium Body Motor
| Models | Torque Range | Drive Type |
|---|---|---|
| GSR81A / GSR82A | 350 – 800 N·m | Lever socket MRU |
All models available in 100V (suffix 1/T) and 200V (suffix 2). Each unit supplied with lever socket MRU36T and metal carrying case as standard.
📊 Specifications — TONE GSR Series Electric Nutrunner
| Model | Torque Range (N·m) | Drive Type | No-Load Speed (rpm) | Voltage (V) | Max Current (A) | Max Power (W) | Weight (kg) | Dimensions W×D×H (mm) |
|---|---|---|---|---|---|---|---|---|
| GSR31T | 150 – 300 | Lever socket MRU | 29 | 100V | 13.5 | 1,350 | 4.2 | 365 × 455 × 130 |
| GSR32T | 150 – 300 | Lever socket MRU | 29 | 200V | — | 1,350 | 4.2 | 365 × 455 × 130 |
| GSR51T | 200 – 500 | Lever socket MRU | 23 | 100V | 13.5 | 1,350 | 4.9 | 365 × 455 × 130 |
| GSR52T | 200 – 500 | Lever socket MRU | 23 | 200V | — | 1,350 | 4.9 | 365 × 455 × 130 |
| GSR81T | 350 – 800 | Lever socket MRU | 16 | 100V | 14.5 | 1,400 | 5.4 | 365 × 455 × 130 |
| GSR82T | 350 – 800 | Lever socket MRU | 16 | 200V | — | 1,400 | 5.4 | 365 × 455 × 130 |
| GSR81WT ⚠ | 350 – 800 | Lever socket MRU | 16 | 100V | 14.5 | 1,400 | 5.4 | 350 × 380 × 110 |
| GSR82WT ⚠ | 350 – 800 | Lever socket MRU | 16 | 200V | 7.5 | 1,400 | 5.4 | 350 × 380 × 110 |
| GSR81A ★ | 350 – 800 | Lever socket MRU | 19 | 100V | 16 | 1,550 | 5.4 | 350 × 380 × 110 |
| GSR82A ★ | 350 – 800 | Lever socket MRU | 19 | 200V | 8 | 1,550 | 5.4 | 365 × 455 × 130 |
| GSR121T | 600 – 1,200 | Lever socket HRU | 10 | 100V | 14.5 | 1,400 | 7.1 | 365 × 455 × 130 |
| GSR122T | 600 – 1,200 | Lever socket HRU | 10 | 200V | — | 1,400 | 7.1 | 365 × 455 × 130 |
| GSR211T | 1,000 – 2,100 | Lever socket VRU | 5 | 100V | 13.5 | 1,350 | 7.3 | 365 × 455 × 130 |
| GSR212T | 1,000 – 2,100 | Lever socket VRU | 5 | 200V | — | 1,350 | 7.3 | 365 × 455 × 130 |
All models: Repeat tightening accuracy ±5% · Bidirectional (tighten/loosen) · Double-insulated · Digitorqon compatible · Pistol-type body · Wired power supply · Supplied with lever socket MRU36T and metal case
⚠ GSR81WT / GSR82WT — Double-switch safety models: Require simultaneous two-hand activation (trigger + sub-switch). Switch positions prevent single-hand operation. Same torque range as GSR81T/82T.
★ GSR81A / GSR82A — Shear Runner models: High-rigidity aluminium body motor. Higher no-load speed (19 rpm), higher max power (1,550 W), and higher current draw compared to the standard T-models at the same torque tier. Note: GSR81A and GSR82A have different body dimensions from each other — confirm with HTC for your specific installation requirements.
