The ATC34CAT19MM is a precision 19 mm, 3/4″ drive, 12-point socket designed specifically for use with Caterpillar MBE / CAT headbolts, main bearing cap bolts, and late-model 19 mm MBE904/906 EGR head bolts. This specialty socket provides the reach, strength, and fit required to torque and remove heavy-duty engine fasteners without rounding or damaging the bolt head.
Built with shop durability in mind, the 12-point design allows for fine indexing in tight bolt circles (every 30° vs 60° for hex sockets), which is especially useful in cramped engine compartments. The 3/4″ drive is compatible with heavy-duty torque wrenches or impact tools, making this socket suitable for both teardown and reassembly work in diesel engine rebuilds.
Whether you’re doing head gasket work, bolt rotation, or full engine disassembly, the ATC34CAT19MM is an essential tool for any heavy-duty diesel technician working with CAT MBE, Detroit, or other 19 mm bolt systems.
🔧 Key Features & Benefits
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Exact fit for 19 mm head and main bolts on CAT MBE 19 mm MBE904/906 EGR engines 2007 and later / Detroit Diesel 12 point 19mm
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3/4″ drive — perfect match for heavy-duty torque or impact wrenches
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hard to find 12-point design enables easier engagement in tight bolt patterns designed for heavy torque applications
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Precisely machined to avoid bolt rounding, improve torque accuracy, and extend tool life
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Ideal for engine rebuilds, maintenance, and service shops working on CAT / Detroit diesel engines