Automotive & Transportation
The Industry
Automotive manufacturing runs on precision and volume. A V8 engine block has dozens of threaded holes — cylinder head bolts, oil passages, sensor ports, accessory mounts. Every one of them has a specified thread depth. Every one of them has to be right.
The Manufacturing Application: What thread depth gage do automotive manufacturers use for cylinder heads and engine components?
One major US automotive plant used 7 Leitech COMBI Gages to cover 103 threaded holes on a 16-valve cylinder head — replacing 33 fixed-depth step gages and reducing gage inventory by 72%.
The Leitech Solution
The Leitech COMBI Gage is the standard for thread depth inspection in automotive production — from cylinder heads and transmission housings to suspension components and brake assemblies.
Leitech-US has supplied precision manufacturers across North America — including Ford, General Motors, Toyota, Honda, Hyundai, Nissan, BMW, Tesla, Aisin, Denso, Magna, ZF, Linamar, Nemak, GKN, BorgWarner, Dana, Getrag and hundreds of Tier 1 precision machine shops.
"At BMW Motorenwerk Steyr, we have over 1,200 Leitech measuring instruments in action in our mechanical manufacturing operations. Our employees in production are very happy with the handling of the measuring equipment."
Gerald Strebl, BMW Group, Motorenwerk Steyr
Aerospace Manufacturing
The Industry
In aerospace manufacturing, the structural integrity of thread form and length of engagement are of paramount importance. There is no margin for error. No acceptable approximation. No workaround that passes an AS9100 or NADCAP audit. Every threaded fastener holding an aircraft together depends on thread depth being exactly right — not estimated, not counted, not assumed. Measured.
The Manufacturing Application: How do aerospace manufacturers verify thread depth for AS9100, NADCAP and FAI compliance on flight-critical machined components?
Aerospace components demand the highest level of thread depth verification. Titanium structural members. Aluminum airframe components. Engine casings and compressor housings. Landing gear assemblies. Turbine disc fastener holes. Nacelle attach fittings. Avionics housings.
Each threaded hole has a specific depth requirement referenced from a precise datum. Each one must be verified with a traceable, auditable, numerical measurement — not a turn count, not a notched step gage, not an approximation. First Article Inspection, in-process verification, and final inspection all demand the same answer: what is the actual functional depth?
Only a direct reading depth scale delivers the level of measurement confidence required to satisfy AS9100, NADCAP, and FAI documentation requirements .
The Leitech Solution
Major aircraft and engine manufacturers in Europe and the US trust Leitech to ensure the quality of their flight-critical components. The Leitech Hi-Resolution COMBI Gage delivers NIST-traceable functional thread size AND depth verification in a single operation — with a locking device that captures the reading in confined spaces and holds it for documentation. Calibrated to FED-STD-H28. Built for AS9100, NADCAP, and FAI audits.
For production-volume aerospace machining, the Standard COMBI and DMG power-driven models deliver consistent, fast, operator-independent depth verification at production speed across engine component lines, structural machining cells, and final assembly inspection benches.
Leitech-US has supplied aerospace manufacturers across North America — including Pratt & Whitney, GE Aerospace, Rolls-Royce, Collins Aerospace, Honeywell Aerospace, Safran, Lockheed Martin, Northrop Grumman, Bell Textron, Sikorsky, Hartzell Propeller, Lisi Aerospace, Barnes Aerospace and hundreds of AS9100-certified aerospace precision machine shops across the US, Canada and Mexico.
Medical & Orthopedic
The Industry
Orthopedic and medical device threads are held to some of the tightest tolerances in manufacturing. An under-depth thread won't hold. An oversized thread won't seat. Either way, the patient pays the price.
Leitech COMBI Gages verify functional thread size and measure functional thread depth simultaneously — in a single operation — so your inspection process is as reliable as the implant itself.
The Manufacturing Application: What gage is used for thread depth inspection on orthopedic implants and medical devices?
Orthopedic and medical device threads are held to some of the tightest tolerances in manufacturing — and for good reason. An under-depth thread won't hold. An oversized thread won't seat. Either way, the patient pays the price. Leitech COMBI Gages verify functional thread size and measure functional thread depth simultaneously — in a single operation — so your inspection process is as reliable as the implant itself.
The Leitech Solution
From M2 bone screws to M12 acetabular cup interfaces, Leitech handles the full range. The Digi-COMBI delivers 0.01mm digital resolution with full SPC data output — giving quality engineers the traceability documentation that FDA-regulated environments demand. NIST traceable. Built in Denmark. Supported in Milwaukee.
Leitech-US has supplied precision manufacturers across North America — including Zimmer Biomet, Stryker, DePuy Synthes, Smith & Nephew, Medtronic, Globus Medical, Arthrex, Integer Holdings, Orchid Orthopedic Solutions and precision medical contract manufacturers across the US, Canada and Mexico.
Energy & Industrial
The Industry
Oil and gas infrastructure, power generation, hydraulics, fluid power — these industries run on components that must not fail. Valve bodies. Pump housings. Turbine casings. Compressor manifolds. The threaded connections that hold these systems together operate under extreme pressure, extreme temperature, and zero tolerance for leakage or failure.
When a valve fails in the field, the consequences aren't measured in scrap — they're measured in downtime, safety incidents, and environmental liability.
The Manufacturing Application: How do oil and gas manufacturers inspect thread depth on valve bodies and pipeline components?
Large-bore threaded valve bodies and flanged connections are among the most demanding thread inspection challenges in manufacturing. Thread depth determines engagement length. Engagement length determines holding strength. And in a high-pressure pipeline or subsea wellhead assembly, holding strength is everything.
Leitech COMBI Gages handle the full range — from fine instrument threads to large-pitch heavy industrial threads — verifying functional size and measuring functional depth in a single operation, on the shop floor, without sending parts to the lab.
The Leitech Solution
The Leitech COMBI Gage is built for the demands of energy and industrial manufacturing — robust enough for the shop floor, precise enough for critical infrastructure. Handle sizes T200 through T700 cover the full thread range from M2 to M33. The Digi-COMBI model adds 0.01mm digital resolution and SPC data output for facilities running statistical process control on critical threaded features.
Leitech-US has supplied precision manufacturers across North America — including Baker Hughes, Halliburton, Emerson, Flowserve, Parker Hannifin, Eaton, Danfoss, Hubbell Power Systems, ABB, Solar Turbines, Dresser-Rand and major energy and industrial contract manufacturers across the US and Canada.
Precision Machine Shops
The Industry
Precision machine shops are where tolerances live or die. Every job that comes through the door has a print. Every print has a thread callout. And every thread callout has a depth requirement that has to be verified before the part ships.
Whether you're running a 5-person job shop or a 200-machine contract manufacturer, your reputation is built one threaded hole at a time.
The ManufacturingApplication: What thread inspection tool works across multiple thread sizes, pitches and depth requirements for contract manufacturers?
Aluminum housings. Steel flanges. Stainless fittings. Threaded bores from M2 to M33 — blind holes at varying depths, varying pitches, varying materials. Your customers span automotive, aerospace, medical, energy and defense. Their requirements span every thread standard on the books.
One Leitech COMBI Gage handles the range. Verify functional thread size and measure functional thread depth simultaneously — on the machine, at the bench, or at final inspection. No calculation. No step gage. No guessing.
The Leitech Solution
The Leitech COMBI Gage is the precision machine shop's most versatile thread inspection tool. A single handle with interchangeable inserts covers multiple thread sizes and pitches. The Hi-Res model delivers 0.1mm resolution for close-tolerance work. The Digi-COMBI adds digital readout and SPC output for shops running quality systems or serving customers who require inspection data with every shipment.
Leitech-US has supplied precision manufacturers across North America — including hundreds of precision machine shops, contract manufacturers, gage labs and metrology service providers serving every major industry sector across the US, Canada and Mexico.
Defense & Military Manufacturing
The Industry
Defense manufacturing demands more from thread depth inspection than almost any other industry. Parts are mission-critical. Tolerances are non-negotiable. Quality standards — MIL-SPEC, DFARS, ITAR, AS9100D — are enforced by government auditors, not just customer quality teams.
Defense manufacturing demands more from thread depth inspection than almost any other industry. Parts are mission-critical. Tolerances are non-negotiable. Quality standards — MIL-SPEC, DFARS, ITAR, AS9100D — are enforced by government auditors, not just customer quality teams. From ITAR-registered precision contract machine shops supplying Tier 1 defense primes, to government arsenals producing ordnance, to military depots remanufacturing battle-damaged combat systems — Leitech COMBI Gages are the thread depth inspection standard wherever precision machined metal components support the warfighter.
The ManufacturingApplication: How do defense manufacturers and precision contract machine shops verify thread depth on MIL-SPEC components for ground combat vehicles, naval systems, missiles, ordnance, and weapons?
Defense precision machining spans an enormous range of components — each with its own thread depth criticality and zero tolerance for failure in the field.
NAVAL & SUBMARINE SYSTEMS: Valve bodies, hydraulic manifold blocks, pressure housing components, pipe fitting interfaces, motor housings, shaft supports, and propulsion system hardware for surface ships and submarines. Thread engagement in a submarine system is a life-safety specification — not a quality preference.
GROUND COMBAT VEHICLES: Tank hull attachment threads, transmission housing ports, suspension component bosses, weapon mount fastener holes on M1 Abrams, Bradley Fighting Vehicle, Stryker, JLTV, and MRAP platforms. Every threaded feature must be verified before the vehicle is assembled and before it goes to war.
MISSILES, ROCKETS & ORDNANCE: Fuze body threads, rocket motor case end cap features, guidance housing attachment threads, warhead interface components, and projectile base threads. Precision machined ordnance components require verified thread depth at every stage of production and inspection.
WEAPONS SYSTEMS & ARMAMENT: Cannon barrel thread features, receiver components, weapon mount hardware, gun system actuator housings, and aircraft weapon station attach points. Every machined weapon system component with a threaded feature is a Leitech application.
The Leitech Solution
The Leitech COMBI Gage meets the full spectrum of defense manufacturing thread depth inspection requirements — from the gage lab to the CNC machine, from prototype First Article Inspection to high-rate production, from new manufacture to depot-level remanufacturing of battle-damaged combat systems.
For tight-tolerance defense applications — precision ordnance components, submarine system hardware, and flight-critical structural parts — the Leitech Hi-Resolution COMBI Gage delivers 0.1mm resolution with a locking device that freezes the reading in confined spaces. NIST traceable. Calibrated to FED-STD-H28.
For production-volume defense machining — vehicle transmission housings, ordnance components, weapon system hardware — the Standard COMBI and DMG power-driven models deliver consistent, operator-independent thread depth verification at production speed. For defense facilities running SPC or requiring digital inspection records, the Digi-COMBI delivers 0.01mm digital resolution with direct data output to your quality system.
Leitech-US has supplied defense manufacturers and precision contract machine shops across North America — including General Dynamics, BAE Systems, Raytheon, Lockheed Martin, Northrop Grumman, L3 Harris and many more.
Heavy Equipment & Agriculture
The Industry
Heavy equipment and agricultural machinery operate in the most unforgiving conditions on earth — construction sites, mine operations, farm fields, logging operations. The drivetrain components, axle assemblies, transmission housings and hydraulic systems that power this equipment are built to last decades under extreme load.
That durability starts on the machine shop floor, where every threaded hole has to be right before the component ever leaves the building.
The Manufacturing Application: What is the best thread depth gage for transmission housings, axle components and heavy equipment assemblies?
Transmission cases. Axle housings. Final drive assemblies. Hydraulic manifolds. Heavy equipment components are large, complex, and expensive — and the threaded features that hold them together are engineered to specific depth requirements for a reason. Too shallow and the fastener pulls. Too deep and you've compromised the casting wall.
There's no rework on a final drive housing. You measure it right the first time.
The Leitech Solution
The Leitech COMBI Gage handles the full thread range found in heavy equipment manufacturing — from fine hydraulic fittings to the large-pitch fastener threads on structural assemblies. Robust enough for the production floor. Precise enough for the quality lab. The Standard and Hi-Res models cover high-volume production inspection. The Digi-COMBI adds digital readout and SPC capability for facilities running statistical process control on critical threaded features.
Leitech-US has supplied precision manufacturers across North America — including Caterpillar, John Deere, CNH Industrial, Komatsu, Doosan Bobcat, Cummins, Dana, Bendix, Meritor, PACCAR, Navistar and major powertrain and drivetrain contract manufacturers across the US, Canada and Mexico.
Remanufacturing
The Industry
Remanufacturing is precision manufacturing's second act — and in many ways, its most demanding. Every engine block, transmission housing, axle carrier, and hydraulic component that enters a reman facility arrives with a history. Worn threads. Damaged bores. Re-tapped holes. Installed inserts.
The reman technician's job is to bring that component back to OEM specification — and that means every threaded feature has to be verified, not assumed.
The Manufacturing Application: How do remanufacturing operations verify thread depth on re-tapped holes and thread inserts?
In remanufacturing, thread depth inspection happens at multiple stages — and each one is a critical quality gate:
Incoming core inspection — is this thread salvageable or scrapped?
Re-tap verification — did re-tapping restore full functional depth?
Thread insert qualification — did the Helicoil, Keensert, or E-Z Lok installation achieve full functional depth?
Final assembly sign-off — is every threaded feature on this component ready to go back into service?
Miss any one of those gates and the component fails in the field. In reman, the thread doesn't just have to be there — it has to be right.
The Leitech Solution
The Leitech COMBI Gage is the reman industry's most practical thread inspection tool — because it answers the right question at every stage of the process. Is the thread the right size? Is it deep enough? One gage. One operation. One direct numerical reading.
For thread insert verification specifically, the Leitech COMBI Gage confirms that the insert has achieved full functional thread depth after installation — the measurement that fixed-depth step gages and turn-counting simply cannot provide.
ISO 9001 reman quality systems require documented, traceable inspection. The Leitech COMBI Gage delivers the direct numerical reading your quality record demands — at the core bench, at the machine, or at final sign-off.
Reman customers include heavy truck engine rebuilders, automotive powertrain reman facilities, diesel engine remanufacturers, industrial and off-highway equipment reman operations, and hydraulic component remanufacturers.