The Epiroc SB 452 T is the tunnel version of the SB 452 Solid Body hydraulic breaker, built for scaling, wall and roof profiling and other underground work on 14,300–28,700 lb (6.5–13 t) carriers. Service weight is 990 lb (450 kg) with a 3.74 in. (95 mm) working tool and 18.5 in. (470 mm) working length. Exchangeable restrictors match the breaker to the job: 550–1,250 bpm tunneling, 850–1,150 bpm scaling; operating pressure 1,450–2,175 psi (100–150 bar) tunneling, 1,450–1,595 psi (100–110 bar) scaling; oil flow 14.5–26.4 gpm (55–100 l/min) tunneling, 18.5–26.4 gpm (70–100 l/min) scaling; max hydraulic input 33.5 HP (25 kW) tunneling, 24.1 HP (18 kW) scaling.

Tunnel-specific details include a press-fit bushing locked by an extra pin to limit bore wear, an exchangeable wear plate, integrated nozzles for water spraying, and a special working tool with front shield and dust cover to limit dust intake. The Solid Body concept integrates the power cell and breaker box in one body and eliminates common parts for a slim, compact, lightweight design, energy recovery feeds piston recoil back into the blow, and the maintenance-free high-pressure accumulator and integrated pressure relief valve protect the breaker from overloads. Current and earlier tunnel tool sets are under Epiroc working tools; see the full Epiroc hydraulic breakers range.

• Carrier weight class 14,300–28,700 lb (6.5–13 t); service weight 990 lb (450 kg)
• Working tool 3.74 in. (95 mm) diameter, 18.5 in. (470 mm) working length; tunnel tools supplied with front shield and dust cover
• Impact rate 550–1,250 bpm tunneling, 850–1,150 bpm scaling; exchangeable restrictors for the two modes
• Oil flow 14.5–26.4 gpm (55–100 l/min) tunneling, 18.5–26.4 gpm (70–100 l/min) scaling
• Max hydraulic input 33.5 HP (25 kW) tunneling, 24.1 HP (18 kW) scaling; operating pressure 1,450–2,175 psi (100–150 bar) tunneling, 1,450–1,595 psi (100–110 bar) scaling
• Integrated water-spray nozzles, exchangeable wear plate, pin-locked press-fit bushing; guaranteed sound power 122 dB(A)
• Supplied as Epiroc configuration 8460030073; carrier adapter plates are carrier-specific and quoted separately; ships by $500 flat-rate Freight from Crowder Supply in Denver