Mitutoyo 571-201-30 Digimatic Depth Gauge

Technical Overview

Precision 0-150mm digital depth gage with ±0.02mm accuracy, 0.01mm resolution, and ABSOLUTE linear encoder. Hardened stainless steel with SPC data output.

Key Features

ABSOLUTE Digimatic technology ensures the gauge keeps track of its origin point once set, eliminating the need to zero-set on power-up
Constructed with hardened stainless steel for enhanced tool longevity and structural rigidity
Hardened and micro-lapped measuring faces and base for exceptional wear resistance and repeatable accuracy
Large LCD digital display with 9 mm character height makes measurement readings highly visible
Equipped with Digimatic SPC data output capability for efficient, paperless quality control recording
Provides stable, unlimited response speed to eliminate overspeed errors on the shop floor
Includes low-voltage and counting value composition error alarms for failsafe measurement operation

Technical Specification Matrix

Parameter	Value
Measuring Range	0 - 150 mm
Accuracy	±0.02 mm
Resolution	0.01 mm
Repeatability	0.01 mm
Base Dimensions (W x T)	100 mm x 6 mm
Display Type	LCD with 9 mm character height
Scale Type	ABSOLUTE electrostatic capacitance linear encoder
Maximum Response Speed	Unlimited
Power Supply	1x SR44 Silver Oxide Battery (Part No. 938882)
Battery Life	Approx. 5 years under normal use (20,000 hours)
Data Output	SPC Digimatic
Alarms	Low voltage, Counting value composition error
Physical Weight (kg)	0.19
Dimensions L x W x H (cm)	23.9 x 5.92 x 1.6

Industrial Applications

1. Machined Part Groove and Slot Inspection

Used in CNC machining facilities to measure the precise depth of milled slots, keyways, and recessed pockets up to 150 mm deep. The hardened, micro-lapped base provides stable positioning, while the ±0.02 mm accuracy ensures parts meet strict mechanical tolerances.

Problem Solved

Prevents out-of-tolerance depth defects in complex machined enclosures. By using the SPC data output, operators can transmit measurements directly to SPC software, reducing manual entry errors and maintaining high-throughput quality control.

CNC MachiningSlot Depth Measurement±0.02mm AccuracySPC Data OutputMicro-lapped Measuring Face

2. Injection Mold Core and Cavity Quality Control

Injection molding tools require exact cavity and step depths to ensure uniform plastic part wall thickness. The 571-201-30 allows metrologists to inspect ejector pin holes, cavity steps, and parting line recesses directly on the mold frame.

Problem Solved

Prevents molding flashing and structural wall failures caused by inaccurate mold plate depths. The ABSOLUTE linear encoder technology saves time by avoiding constant zero-point calibration when measuring multiple critical points across a large mold layout.

Injection MoldingMold Cavity DepthABSOLUTE Linear EncoderStep MeasurementRepeatability 0.01mm

3. Automotive Engine Block Blind Hole Depth Auditing

Ideal for automotive assembly lines to verify the depth of blind threaded holes and cylinder head bores before bolt fastening. The standard 100mm base spans the bore openings stably, and the slim beam easily reaches depths up to 150mm.

Problem Solved

Eliminated the risk of bottoming out bolts in short-threaded blind holes, which can lead to improper clamping torque or engine block cracking. The unlimited response speed ensures that fast-moving technicians on the shop floor do not cause counting errors during high-speed sliding measurements.

Automotive AssemblyBlind Hole MeasurementUnlimited Response SpeedHardened Stainless SteelBore Depth Auditing