The Jarvis Model USSS-21 is a next-generation, pneumatically operated high-speed captive bolt stunner designed to deliver more effective, humane stunning for cattle. Engineered for modern meat processing facilities, the USSS-21 improves animal welfare while enhancing meat quality and operational efficiency.
 
Featuring a new, lightweight design and a faster, more consistent bolt speed—up to 130 ft/sec (39.6 m/sec)—the USSS-21 ensures animals are rendered instantly insensible to pain in a single shot. Its oblong-shaped penetrating shaft offers superior skull penetration while using up to 25% less air per cycle with no reduction in performance.
 
Built with operator comfort in mind, the USSS-21 includes an ergonomic handle and an auxiliary grip that rotates for custom control. With dual-trigger pneumatic operation and two firing sequence options, this tool minimizes operator fatigue and accidental activation risks. Its easy-to-clean, maintainable design makes it ideal for high-throughput, safety-conscious environments.
 
Key Features:
Superior Stunning Performance:
15–20% faster bolt speed and consistent one-shot stunning.
Oblong rod design improves skull penetration and meat quality.
Air-Efficient Design:
Operates with 25% less air without sacrificing performance.
Normal operating pressure: 175–240 psi.
High-Speed Pneumatic Operation:
Shaft velocity of 130 ft/sec (39.6 m/sec).
Air consumption per cycle: 0.63–0.83 ft³ (17.8–23.5 L).
Ergonomic and Safe Handling:
Lightweight with rotating auxiliary handle for adjustable grip.
Dual trigger system with two firing sequences for added control and operator safety.
Compact and Durable:
Dimensions: 19 x 9 x 17.5 in (482 x 229 x 445 mm).
Weighs 36.5–38.5 lbs depending on handle configuration.
 
The Jarvis USSS-21 Pneumatic Stunner delivers a powerful combination of efficiency, safety, and humane precision—perfectly suited for modern, high-performance meat processing operations.
 
Technical Specifications:
Drive: Pneumatic
Model USSS-21:
Normal Operating Pressure: 12.1 – 16.6 bar (175 – 240 psi)
Maximum Operating Pressure: 17.2 bar (250 psi)
Air Consumption (per cycle) @ 175 psi (12.1 bar): 17.8 – 23.5 L (0.63 – 0.83 ft³)
Shaft Diameter: 19 x 13.2 mm (0.75 x 0.52 in)
Shaft Velocity @ 175 psi (12.1 bar): 39.6 m/sec (130 ft/sec)
Control Handles: Dual Trigger Pneumatic
Overall Dimensions (L x W x H): 482 x 229 x 445 mm (19 x 9 x 17.5 in)
Weight (knocker box side handle): 16.6 kg (36.5 lbs)
Weight (knocker box rear handle): 17.5 kg (38.5 lbs)
Weight (restrainer rear handle): 16.8 kg (37 lbs)
 
Equipment Selection and Accessories:
Rear Handle for “V” or Center Track Restrainer – Order Number: 4044132
Rear Handle for Use in Knocker Box – Order Number: 4044133
Side Handle for Use in Knocker Box – Order Number: 4044134
 
Air Compressor:
5 hp – 460 V / 60 Hz – Order Number: 4061361
10 hp – 460 V / 60 Hz – Order Number: 4061366
5 hp – 575 V / 60 Hz – Order Number: 4061363
5 hp – 380 V / 60 Hz – Order Number: 4061364
5 hp – 230 V / 60 Hz – Order Number: 4061376
5 hp – 220 V / 60 Hz – Order Number: 4061377
 
Model AST-107 Pneumatic Stunner Tester (includes test stand and control box)
115 V / 60 Hz – Order Number: 4016015
230 V / 60 Hz – Order Number: 4016016
 
Air Filter-Regulator-Lubricator (64 oz / 1.9 L Capacity) – Order Number: 3022100
 
Model MSPR-2 Three-Way Pressure Setting Air Regulator, with Filter and Lubricator
115 V – Order Number: 3063703
230 V – Order Number: 3063704
 
Air Hose Assembly (coiled, 25 ft / 7.6 m) – Order Number: 3059045
Balancer – Order Number: 4042035