Aerospace Machining for Flight Safety-Critical Parts
TEK Precision is an AS9100D certified aerospace machine shop in Deer Park, NY, machining flight safety-critical components to OEM print for rotorcraft and fixed-wing programs. CNC milling, turning, precision grinding, honing and inspection all happen under one roof, with full traceability from raw material to the shipped part.
Built to Print Since 1968
TEK Precision started in 1968 as a precision grinding company and grew into a build-to-print manufacturer of machined flight components and assemblies. Today that machining capability supports Sikorsky rotorcraft and Northrop Grumman fixed-wing programs, along with US military and commercial aftermarket supply.
Every part is machined to the customer's drawing and revision. Our certified scope covers machining and assembly of rotary head and fixed wing components for the aerospace industry, so the machining work you buy is the work our quality system is audited against.
Machining Capabilities
CNC Milling
Horizontal machining centers including a Hitachi Seiki HC 400, Okuma MC-500H and Compumill HMC-410, plus Comet and Fadal vertical milling centers, backed by ten Bridgeport mills for secondary operations.
CNC Turning
Hitachi Seiki HT40 and two Mori Seiki SL250 turning centers, with engine lathes up to 17 inches and Hardinge lathes for small, precise turned parts.
Grinding and Honing
Three Tschudin cylindrical grinders, an Okamoto surface grinder and three Sunnen honing machines for bores, journals and sealing surfaces held to the tightest tolerances on the drawing.
Precision Grinding Is Where TEK Began
Ground surfaces on hydraulic spools, shafts, pistons and liners decide how a part seals, wears and survives fatigue loads. TEK's cylindrical and surface grinding capability has been central to the business since the company was founded.
Grinding can damage a surface without changing its dimensions. That is why TEK performs temper etch inspection in-house to detect grind burn per Sikorsky specification SS8705, so ground flight parts are checked for surface damage as well as size. Learn more in our article on grind burn and nital etch inspection.
Aerospace Materials We Machine
TEK machines flight hardware from aluminum, titanium, Inconel and stainless steel alloys, in the forms and heat-treat conditions the drawing specifies.
Material traceability is maintained from the mill certification through every operation to the certificate of conformance that ships with the parts. Our material traceability guide explains what that record contains.
Typical Machined Components
Flight Control Hardware
Pitch links, rod ends, control levers, links and bellcrank components for rotorcraft flight control systems.
Rotor and Drive Components
Rotor shafts, spindle assemblies, bearing housings, bushings and liners for rotary head and drive applications.
Hydraulic Components
Pistons, cylinders, actuator bodies, manifold blocks and housings, many finished in-house as complete hydraulic assemblies.
Inspection Built Into Every Job
Machined flight parts are verified in a dedicated 1,200 square foot inspection area with a Brown and Sharpe CMM, Wilson hardness testers, lab-grade surface plates, a profilometer and a complete Johnson thread gaging system rated for safety-critical threads.
All measuring and test equipment is calibrated to NIST-traceable standards. New part numbers receive 100% first-article inspection, and the quality organization holds independent authority over source, in-process and first-piece inspection. See the full quality program for approvals and equipment.
In-House Special Processes
Machined parts often need processing before they ship. Doing it in-house keeps control of schedule and traceability.
- Thermal stress relief per SS8407 and SS8669
- Temper etch inspection for grind burn per SS8705
- Hardness inspection per ASTM E-10, E-18, E-92 and E-384
- Ultrasonic cleaning and degreasing
- Structural adhesive bonding to all classes of SS8669 for Sikorsky programs
Platforms We Support
TEK machines components for Sikorsky rotorcraft including the UH-60 Black Hawk, SH-60 Seahawk, CH-53, S-92, S-76, S-61 and Sky Crane, and for Northrop Grumman fixed-wing platforms. Machined parts also flow to the US Army, US Navy, US Air Force and Defense Logistics Agency supply channels. See our customers for details.
Why Buyers Machine Flight Parts With TEK
One Qualified Source
Machining, grinding, special processes, assembly, hydraulic testing and inspection happen in one Deer Park facility, so fewer hand-offs touch your parts.
Proven OEM Performance
13 UTC Gold Awards, 19 Northrop Grumman Platinum Awards and 2 Lockheed Martin RMS Elite Awards reflect decades of on-time, conforming deliveries.
Controlled Data
ITAR compliant handling of drawings and technical data, under an independently audited quality management system.
Aerospace Machining FAQ
Is TEK Precision an AS9100 certified machine shop?
Yes. TEK Precision holds AS9100D / ISO 9001:2015 certification, certificate number 275724, for machining and assembly of rotary head and fixed wing components for the aerospace industry.
Do you machine parts to customer drawings?
Yes. TEK is a build-to-print manufacturer. Every part is machined to the customer's drawing, revision and specifications, with first-article inspection on new part numbers.
Which materials can you machine?
TEK machines aerospace aluminum, titanium, Inconel and stainless steel alloys to the material and heat-treat condition the drawing specifies.
How fast can I get a quote?
Send your drawings, models or part numbers. TEK's engineering team responds within one business day.
Send Your Drawings for Review
Send drawings, models or part numbers and our engineering team will confirm capability and respond within one business day. Buying a part we already make? Search the parts catalog.