The Jarvis Model USSS-22A is a pneumatically operated, high-speed non-penetrating stunner engineered for the humane and efficient stunning of cattle and veal. Available in both 54 mm and 60 mm striking end variants, the USSS-22A is designed to render animals insensible to pain without skull penetration—promoting animal welfare and preserving carcass quality.
 
As Jarvis’s most powerful non-penetrating stunner, the USSS-22A features a 5–10% faster bolt speed than previous models. It delivers a precise, single-shot stunning cycle that prevents accidental multiple firings and enhances overall meat quality. Built with dual triggers and handles, this tool ensures accurate head contact while minimizing recoil and reducing operator fatigue.
 
With a robust pneumatic system operating at up to 250 psi, and a lightweight body (as low as 37.2 lbs), the USSS-22A is ideal for high-throughput environments requiring consistent performance, ergonomic handling, and easy maintenance.
 
Key Features:
Advanced Non-Penetrating Stunning:
Humane design ensures no skull penetration.
Optimizes animal welfare and improves meat quality.
One-Shot Precision Operation:
Fires once per cycle, eliminating the risk of multiple discharges.
Air consumption per cycle: 0.63–0.83 ft³ (17.8–23.5 L).
Enhanced Power and Speed:
54 mm model: 95 ft/sec bolt velocity.
60 mm model: 90 ft/sec bolt velocity.
Ergonomic and Safe Handling:
Dual-trigger, dual-handle configuration reduces kickback.
Promotes operator comfort and fatigue reduction.
Flexible and Durable Build:
Dimensions: 20.9 x 9 x 17.5 in (531 x 229 x 445 mm).
Weight: 37.2–39.2 lbs depending on handle configuration.
Easy Maintenance:
Designed for quick cleaning and simple repairs, ensuring minimal downtime.
 
The Jarvis USSS-22A sets a new standard for non-penetrating pneumatic stunning—delivering unmatched power, control, and humane processing performance.
 
Technical Specifications:
USSS-22A (54 mm)
Normal Operating Pressure: 12.1 – 16.9 bar (175 – 245 psi)
Maximum Operating Pressure: 17.2 bar (250 psi)
Air Consumed per Cycle @ 175 psi: 17.8 – 23.5 L (0.63 – 0.83 ft³)
Shaft Diameter:
Striking End: 53.98 mm (2.125 in)
Rod: 34.93 mm (1.375 in)
Shaft Velocity @ 175 psi: 29 m/sec (95 ft/sec)
Control Handles: Pneumatic | Dual Trigger
Overall Dimensions (L x W x H): 531 x 229 x 445 mm (20.9 x 9 x 17.5 in)
Weight:
Knocker Box Side Handle: 16.9 kg (37.2 lbs)
Knocker Box Rear Handle: 17.8 kg (39.2 lbs)
Restrainer Rear Handle: 17.1 kg (37.8 lbs)
 
USSS-22A (60 mm)
Normal Operating Pressure: 13.1 – 16.9 bar (190 – 245 psi)
Maximum Operating Pressure: 17.2 bar (250 psi)
Air Consumed per Cycle @ 175 psi: 17.8 – 23.5 L (0.63 – 0.83 ft³)
Shaft Diameter:
Striking End: 60 mm (2.36 in)
Rod: 34.9 mm (1.37 in)
Shaft Velocity @ 175 psi: 27.4 m/sec (90 ft/sec)
Control Handles: Pneumatic | Dual Trigger
Overall Dimensions (L x W x H): 531 x 229 x 445 mm (20.9 x 9 x 17.5 in)
Weight:
Knocker Box Side Handle: 16.9 kg (37.2 lbs)
Knocker Box Rear Handle: 17.8 kg (39.2 lbs)
Restrainer Rear Handle: 17.1 kg (37.8 lbs)