Fowler 52-125-004-0 Flat Depth Base Attachment for Dial & Electronic Indicators

The Fowler 52-125-004-0 Flat Depth Base Attachment is a precision accessory that instantly converts a standard dial or electronic indicator into a fully functional depth gage. With a 4-inch ground and lapped base, it provides a stable, flat reference surface for accurate and repeatable depth measurements on machined slots, counterbores, and other recessed features.

Key Features:

• Converts any compatible dial or electronic indicator into a depth gage
• 4" base length for stability and broad surface contact
• Fits indicators with 3/8" (0.375") or 8mm mounting stems — adaptor bushing included
• Ground and lapped base for exceptional flatness and consistent readings
• Includes four 4-48 threaded depth extensions for added depth range

Manufactured by Fred V. Fowler Company, a trusted name in precision metrology since 1946, this depth base attachment is ideal for quality control, inspection labs, machining, and shop-floor dimensional checks. The included adaptor bushing ensures compatibility with both imperial and metric indicator stems, eliminating the need for additional tooling.