Engineered for continuous duty, every TAKUMI spark plug passes through our certified quality control process: dimensional checks, leak tests and electrical tests.

Product Overview

TAKUMI R5B12-77 spark plug. TAKUMI R5B12-77 iridium industrial spark plug, cross-referenced to Champion RB77WPCC / Denso GI3-1 / Altronic L1863B family.

Every TAKUMI unit is produced in an ISO 9001 and IATF 16949 certified factory, 100% tested before shipment. The plug is engineered for long service life in continuous operation, with a nickel-plated shell, copper-core electrode and high-grade ceramic insulator.

Key Specifications

• TAKUMI TypeR5B12-77
• Thread SizeM18 x 1.5
• Reach20.6 mm (13/16")
• Hex Size22.2 mm (7/8")
• Seat TypeFlat
• Spark Gap0.3 mm
• Heat Range77
• Electrode TypeIridium / Double J
• ResistorYes

Cross Reference

• ChampionRB77WPCC / KB77WPCC / RB77CC / PB78WPC / RB77WPC
• DENSOGI3-1 / GI3-3 / GI3-5
• ALTRONICL1863B / L1863IP / L1863DP
• Federal Mogul / BERU18GZ4-77 / 18GZ6-77-2
• C-A-T243-4291 / 301-6663 / 194-8518
• WAUKESHA60999Z / 69919D / 69919Z
• C-U-M-M-I-N-S4098162
• GUASCOR7664292

Applications

• CAT G3500 series (G3508 / G3512 / G3516 / G3520)
• WAUKESHA gas engines
• C-U-M-M-I-N-S Q19G
• Industrial gas generators

Advantages

• Drop-in replacement - no engine parameter changes required
• Reliable ignition under high pressure and lean combustion
• Anti-corrosion nickel-plated housing
• 95% alumina insulator for heat and shock resistance
• Monolithic resistor for stable conductivity
• Factory direct with competitive pricing and short lead time

OE numbers are for reference only. Final fitment should be confirmed before ordering.

Factory & Quality Control

The testing equipment is calibrated regularly and all inspection records are kept for at least three years, supporting fast after-sales analysis.

Production Workshop

TAKUMI runs a fully integrated manufacturing base: CNC machining, automated assembly and 100% functional testing under one roof.

From raw material to finished spark plug, every process is controlled in-house with ISO-certified procedures.