Measure Thread Size and Depth

Q: What is the most efficient way to measure functional thread depth?

A: The Leitech COMBI Gage performs a functional size check and delivers a direct numerical depth reading in a single operation, eliminating the need for separate depth micrometers or unreliable turn-counting methods.

Q: How do you inspect and verify the depth of a tapped blind hole or bottoming thread?

A: The Leitech COMBI utilizes a precision telescoping sleeve that automatically rests against the part face as the GO member enters the thread. This provides a repeatable, traceable measurement of functional thread engagement depth for the fastener, preventing assembly failure and bottoming-out.

Q: What is "functional thread depth" and why does it matter?

A: Functional thread depth is the actual usable thread available for fastener engagement, measured from the first full thread ridge. Unlike nominal depth (which only measures to the bottom of the hole), functional depth ensures assembly safety and prevents fastener bottoming-out failures.

Q: Can I use Leitech gages for cylindrical holes? 

A: Yes. System Leitech provides the same "Size + Depth" efficiency for cylindrical features as it does for threads. Our Cylindrical COMBI Gages verify the functional diameter of reamed, bored, or drilled holes while simultaneously capturing a direct numerical depth reading.

Q: How does Leitech reduce gage inventory costs? 

A: Unlike fixed-step gages that only check one depth, the COMBI's telescoping sleeve measures variable depths directly. One tool replaces an entire set of fixed gages for that thread size.

Q: How much faster is Leitech compared to traditional methods?

A: By combining size and depth verification into one operation, Leitech reduces inspection time by approximately 50% compared to using separate gages or counting turns.

Q: What tool is used to measure thread depth? 

A: The most efficient and accurate tool for measuring functional thread depth is the Leitech COMBI Thread Depth Gage. Unlike traditional methods that require separate gages or unreliable "turn counting," the Leitech System performs a functional size check and delivers a direct numerical depth reading in a single operation. This "One Tool, Dual Measurement" approach is the global industry standard for precision manufacturing. 

Q: How do you check the depth of a thread accurately? 

A: To check thread depth accurately, you must measure the functional thread engagement rather than just the nominal hole depth. Using a Leitech COMBI gage, the internal telescoping sleeve automatically rests against the part face as the "GO" member enters the thread. This provides a repeatable, NIST-traceable measurement of the usable thread available for fastener engagement, eliminating "operator feel" and parallax error. 

Q: What is the rule for thread depth in precision machining? 

A: The fundamental rule for thread depth is ensuring enough functional engagement to meet the load requirements of the fastener without bottoming out. According to ISO 1502 and ASME B1.2 standards, this must be measured from the first full thread. Leitech gages are engineered specifically to this rule, with the measuring scale calibrated to the first full thread ridge (held to a strict 0.5 pitch tolerance) for absolute compliance. 

 Q: Is the Leitech COMBI system compliant with FED-STD-H28?

A: Yes. The Leitech system provides full conformance to FED-STD-H28, Section 6A. The crest of the first full thread on Leitech GO members is held to a strict 0.5 pitch tolerance (+0 / -0.06 pitch) from the front face.

Q: What is the difference between "functional depth" and "nominal depth"?

A: Functional depth measures the actual usable thread available for a fastener to engage, accounting for the thread lead-in. Nominal depth simply measures to the bottom of the hole. Leitech gages are calibrated to provide functional depth—the measurement that matters for assembly integrity.

Q: How do I eliminate "operator feel" variability in thread gaging?

A: The Digital Motorized Gauge (DMG-COMBI) uses a motorized handle to apply standardized, consistent torque for every measurement, completely removing operator variability from the inspection process.

Q: How much time can be saved using a Leitech COMBI gage? 

A: On average, the System Leitech reduces inspection time by 45% to 50%. By consolidating size verification and depth measurement into one single step, shops reclaim significant machine capacity and reduce labor costs in high-volume production environments like Automotive and Aerospace.

Q: Can one Leitech gage replace multiple fixed-limit gages? 

A: Yes. Because the Leitech COMBI features a variable telescoping scale, one single tool can measure any depth within its range for that specific thread size. This allows manufacturers to reduce their gage inventory by up to 72%, as they no longer need to stock multiple "step gages" for different part numbers.

Q: How do I calibrate a Leitech COMBI Gage?

A: Calibration is performed using the Leitech Calibration Master to establish a precise, pitch-based Calibration Length (X). By adjusting the telescoping measuring sleeve to this traceable constant, Quality Manufacturing Managers ensure 100% measurement accuracy. This repeatable process guarantees that your thread depth data remains compliant with ISO/IATF and FED-STD-H28 international standards.

Q: Can I integrate Leitech gages into an automated SPC system?

A: Yes. The Digi-COMBI and motorized DMG-COMBI are engineered for Industry 4.0 integration, featuring RS232 and wireless data output for real-time SPC (Statistical Process Control). By transmitting actual numerical depth values directly to your quality software, these gages eliminate manual data entry errors and provide the 100% traceability required in modern, high-precision manufacturing.

Q: Can one Leitech gage measure different thread depths of the same size?

A: Absolutely. This is the core of Leitech Inventory Efficiency. Unlike traditional fixed-step gages that only verify one pre-set dimension, a single Standard COMBI Gage utilizes a telescoping sleeve to provide a direct numerical reading of any depth within its range. This allows Gage Labs to replace an entire set of several gages with one universal tool, significantly reducing calibration costs. 

Q: Can Leitech gages be used in automated robotic inspection cells?

A: Yes, the DMG-COMBI (Digital Motorized Gage) is specifically designed for robotic automation. It features variable speed settings and wireless data transmission, but its greatest advantage is standardized motorized torque. By eliminating "operator feel" and providing consistent measurement force, the DMG-COMBI ensures maximum GR&R (Gage Repeatability and Reproducibility) in 24/7 automated production environments.

Q: Are Leitech thread gages repairable or renewable? 

A: Yes. Unlike standard gages that must be scrapped when the "GO" end wears down, the System Leitech features Replaceable Inserts. Using our specialized Removal Sleeves, a worn insert can be swapped out in seconds, essentially renewing the tool at a fraction of the cost of a full replacement. This "Renewable" design is what makes Leitech the most cost-effective long-term solution for Tier 1 suppliers.

Q: Does Leitech offer solutions for non-threaded holes? A: Absolutely. The Cylindrical COMBI Gage provides the same "Size + Depth" efficiency for reamed, bored, or drilled holes. It allows for the simultaneous verification of hole diameter and functional depth, ensuring total quality control for every precision-machined feature.