Mitutoyo 137-219 Tubular Inside Micrometer Extension Rod Type 2-40" Carbide-Tipped

The Mitutoyo 137-219 is a Series 137 mechanical tubular inside micrometer featuring an extension rod design with carbide-tipped measuring faces and a measuring range of 2 to 40 inches. This precision instrument is engineered for accurate measurement of inside dimensions across cylinders, rings, bores, and parallel surfaces.

Interchangeable extension rods with cylindrical gage rods are spring-mounted in protective sleeves, allowing the measuring range to be extended quickly and reliably. The 0.5-inch travel micrometer head provides slow, fine head movement for precise positioning, while a locking clamp secures measurements for easy reading. Each extension rod features a knurled collar for secure, tool-free installation and removal.

Included Extension Rods (8 total):

• 0.5-inch rod (1 pc)
• 1-inch rod (1 pc)
• 2-inch rods (2 pcs)
• 4-inch rod (1 pc)
• 8-inch rods (2 pcs)
• 12-inch rod (1 pc)

Specifications:

• Measuring Range: 2 to 40 inches
• Graduation: 0.001 inch
• Travel of Micrometer Head: 0.5 inch
• Accuracy: ±{0.00012 + 0.00005n + (0.00004 × R/2)}" (n = number of rods; R = max measuring length in inches)
• Measuring Faces: Carbide-tipped for enhanced durability and wear resistance
• Display Type: Mechanical (non-digital)
• Series: 137

Supplied complete in a fitted plastic protective case. Part of Mitutoyo's trusted Series 137 lineup of tubular inside micrometers.