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Starrett 98-8 Precision Machinist Level (8-Inch)
The Starrett 98-8 is a highly accurate 8-inch (200 mm) precision machinist level designed for aligning and leveling heavy machinery, shafting, and industrial equipment. It features a ground and graduated main vial alongside a built-in cross test vial, allowing technicians to verify level in multiple directions simultaneously and avoid reading inaccuracies caused by side canting on cylindrical surfaces.
The instrument is constructed with an involute grooved base, providing a reliable, stable seat for round materials such as pipes or shafts. Its sensitive vial is protected by a satin chrome-finished brass tube equipped with a friction-fit closing cover to prevent accidental breakage during storage or transit.
Technical Specifications
| Manufacturer Model | 98-8 |
|---|---|
| Tool Length | 8 inches (200 mm) |
| Vial Graduations | 80-90 seconds (0.005 inches per foot / 0.42 mm per meter) |
| Graduation Markings | Six lines on each side of the bubble |
| Housing Material | Satin chrome-finished brass tube |
| Base Design | Involute groove (lengthwise) |
Frequently Asked Questions
Q: What are the graduation increments on the Starrett 98-8 main vial?
A: The main vial is graduated at approximately 80 to 90 seconds, which translates to 0.005 inches per foot (0.42 mm per meter). There are six markings on each side of the central bubble.
Q: Can this level be used securely on round pipes or shafts?
A: Yes, the base of the level features an involute groove running its entire length, allowing it to seat securely and accurately on round surfaces without slipping.
Q: What is the purpose of the cross test vial?
A: The adjustable cross test vial allows for simultaneous leveling in two perpendicular directions. This prevents inaccuracies in the main vial reading that can occur if the level is canted sideways while resting on round work.
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