Master Setting Disc (SDL / SDS)

Lapped setting discs for air rings and snap gages, in ANSI style 1 or style 3.

Sizes: .150" to 14.510" (3.81 to 368.55 mm)
Part number: SDL or SDS-[class]-[material]-[size]
Example: SDS-XX-C-.7500

Priced by size in the online configurator

Build & price online →

Send us a print (815) 242-0027

Build the part number and see the price in minutes
Formal PDF quote emailed to you
Dual Master or Single Master tooling

Master setting discs set air rings, snap gages and ring gages. They are lapped and polished, in steel or chrome, from .150″ to 14.510″ (3.81 to 368.55 mm).

Two styles

Code	ANSI B47.1 style	Use
SDL	Style 1, full length	Longer disc, for gages set in a fixture or by hand
SDS	Style 3, short	Shorter disc, and usually the lowest cost

Disc length grows with size, from 7/8″ (SDL) or 7/16″ (SDS) on the smallest discs to 2″ and 1″ above 2.010″.

How to order

SDL or SDS – class – material – size. Class XX or X, material S (steel) or C (chrome). Add -MM for metric sizes. Example: SDS-XX-C-.7500.

Certification

Every master ships with a long-form certificate of calibration showing the actual measured size, traceable to NIST. Calibration is done in a temperature-controlled lab conforming to ISO/IEC 17025 and ANSI/NCSL Z540-1.

How many masters?

Dual Master air gaging takes two masters, one at each end of the tolerance. Single Master takes one, at nominal. For best results with a single master, pick a size near the middle of the part tolerance.