Gotoh SG381-01 MG-T Locking 3L/3R Cosmo Black Guitar Tuning Machines

Locking Tuner Set for Stable, Accurate Tuning

The Gotoh SG381-01 MG-T Locking 3L/3R Cosmo Black is a complete six-piece set of locking tuning machines for 3+3 headstocks on electric and acoustic guitars. Each tuner pairs a 16:1 gear ratio with Gotoh's MG-T Traditional Locking System, which uses a knurled thumbwheel on the back of the machine head to clamp the string at the post. The result is fewer string slips, less re-tuning between songs, and quicker string changes during a gig.

Built in Japan from sealed-gear hardware, the set features large metal buttons in a vintage shape, a 20 mm shaft length, and a 10 mm bore that drops into most standard tuner holes without modification. The Cosmo Black finish gives a dark, low-glare look that pairs well with black or dark hardware on a wide range of guitars.

Key Specs at a Glance

• Type: Locking tuning machine set, 3+3 configuration — drop-in replacement for 3+3 headstocks
• Gear Ratio: 16:1 — fine, controlled adjustments for accurate tuning
• Locking System: MG-T with rear knurled thumbwheel — locks string at the post for better tuning stability
• Shaft Length: 20 mm — fits most electric and acoustic guitar headstocks
• Bore: 10 mm — standard mounting hole for direct installation
• Finish: Cosmo Black — dark, durable coating made in Japan
• Package: 6 pieces — full set covers all six strings