KEYSTONE PRECISION MACHINING // EST. 1987
CERT ISO 9001:2015 · AS9100D · ITAR REGISTERED TOLERANCE ±0.0001" FACILITY 38,000 SQ FT · BRIDGEPORT, CT EST 1987 · 38 YEARS IN OPERATION
ACCEPTING NEW PROGRAMS · Q3 2026

Precision components
for the industries
where tolerances
are not negotiable.

5-axis CNC milling, Swiss turning, wire EDM, and full inspection on a single floor. AS9100D certified. ITAR registered. Producing flight-critical, implant-grade, and defense-spec components since 1987.

// INDUSTRIES SERVED

Where our components ship.

01

Aerospace

Flight-critical machined components for tier-1 and tier-2 aerospace primes. Engine accessories, structural fittings, hydraulic manifolds. AS9100D supply chain.

  • Inconel 718 · Ti 6AL-4V · A286
  • FAI per AS9102
  • NADCAP-traceable processes
02

Medical device

Implant-grade and surgical-instrument components for Class II and Class III device manufacturers. Validated processes, full lot traceability, certificate of conformance with every shipment.

  • Ti-6AL-4V ELI · 17-4 PH · PEEK
  • 13485-aware processes
  • Sterilization-compatible finishes
03

Defense & aerospace prime

ITAR-controlled component manufacturing for DoD primes and integrators. Cleared facility, U.S.-citizen workforce, controlled-document workflow.

  • ITAR registration current
  • DFARS-compliant materials
  • Mil-spec finishes & coatings
04

Semiconductor & energy

Vacuum chamber components, fixturing, RF assemblies. Tight-tolerance work in 6061, 304/316L, copper, and engineering plastics.

  • UHV-grade surface finishes
  • Cleanroom-ready packaging
  • Run sizes from prototype to 10k+
// CAPABILITIES MATRIX

What's on the floor.

22 CNC machines across 38,000 sq ft. Lights-out capable on the pallet cells. Inspection room temperature-controlled to ±1 °F.

PROCESS
EQUIPMENT
ENVELOPE
TOLERANCE
QTY
5-Axis Milling
DMG Mori DMU 50, Makino D200Z
20" × 16" × 14"
±0.0002"
4
3-Axis Milling (HMC)
Mazak HCN-5000 pallet cell
30" × 24" × 24"
±0.0005"
3
3-Axis Milling (VMC)
Haas VF-2 / VF-4SS
40" × 20" × 20"
±0.001"
6
Swiss Turning
Tsugami SS207, Citizen L20
1.25" Ø × 12" L
±0.0002"
4
CNC Turning
Mazak QT-200, Doosan Lynx
14" Ø × 24" L
±0.0005"
3
Wire EDM
Sodick AQ400L, Mitsubishi MV2400S
16" × 12" × 10"
±0.0001"
2
Inspection
Zeiss Contura G2 CMM, Keyence VHX, Mahr
Climate-controlled
// MATERIALS REGULARLY MACHINED
6061-T6 / 7075 17-4 PH 304 / 316L SS Ti-6AL-4V Ti-6AL-4V ELI Inconel 625 / 718 A286 15-5 PH Hastelloy C-276 Brass C36000 OFHC Copper Tool steels (D2/A2/S7) PEEK Delrin / Acetal Ultem 1000 / 2300 Carbon steel (1018/1144/4140)
// CERTIFICATIONS & COMPLIANCE

Audited. Documented. Renewed.

ISO
9001
ISO 9001:2015 Quality Management System NSF-ISR · Cert #C2018-04482 · Renewed 2024
AS
9100
AS9100D Aerospace Quality Standard NSF-ISR · Cert #A2018-00417 · Renewed 2024
ITAR
ITAR Registered 22 CFR 122 · Defense Trade DDTC Reg · Renewed annually
DFARS
DFARS 252.225-7009 Specialty Metals Compliance Documented supply chain
CAGE
CAGE Code 4ZP19 SAM.gov Active NAICS 332710, 336412
NIST
NIST 800-171 CUI Self-Assessment Score reported · CMMC L2 ready
// FACILITY

One floor. End-to-end.

Programming, machining, inspection, and shipping happen under one roof in our 38,000 sq ft Bridgeport facility. No outside-process bottlenecks. No supplier-of-suppliers risk on flight-critical work.

38,000SQ FT FACILITY
22CNC MACHINES
62FULL-TIME EMPLOYEES
±0.0001"MIN TOLERANCE
// STANDARD PROGRAM FLOW
  1. 01
    RFQ & print review24–72 hr response
  2. 02
    DFM feedback & quote3–10 business days
  3. 03
    PO acceptance & routingSame day
  4. 04
    Programming & first-article1–3 weeks per program
  5. 05
    FAI per AS9102Submitted with shipment
  6. 06
    Production runBy PO schedule
  7. 07
    Inspection & CoC100% on flight-critical
  8. 08
    Ship to customer dockTracked. Documented.
// SHIPPING TO TIER-1 PRIMES IN AEROSPACE, MEDICAL DEVICE, AND DEFENSE
PRIME A
PRIME B
PRIME C
PRIME D
PRIME E
PRIME F

Customer names withheld per NDA — references provided to qualified prospects on request.

// REQUEST FOR QUOTE

Send prints. Get a quote.

Most RFQs answered within 3 business days. Larger programs (5+ part numbers, complex DFM) take up to 10. We require 2D prints for quoting; 3D models (STEP/Parasolid) are appreciated but not required.

FACILITY1847 Boston Avenue, Bridgeport, CT 06610
SECURE PORTALFor ITAR-controlled prints, request our SFTP credentials.
FORM RFQ-INTAKE-2026

RFQ DESK ACKNOWLEDGES RECEIPT WITHIN 4 BUSINESS HOURS · QUOTING WINDOW 3-10 BUSINESS DAYS