OD, ID, jig, and surface grinding — micron-level finishing.
Grinding holds tolerances milling and turning can't — and produces finishes that lapping would have to chase. Hardened steel, carbide, ceramic. OD, ID, jig, surface. AS9100D + ITAR-compliant. Job costing and certs flow through our machine shop ERP.
Each grind serves a different geometry.
OD, ID, jig, and surface grinding each handle a specific class of feature. Most precision parts use a combination — turn a shaft, then OD-grind to size and finish.
OD & ID cylindrical grinding
Round work to ±.00005". Hardened shafts after heat treat. Bearing journals, hydraulic spools, instrument arbors. Concentricity and finish in one operation.
Jig grinding
Precision-location features in hardened tooling — pin holes, gauge bores, inspection masters. Holds positional tolerance to .0001" against datums.
Surface grinding
Flat finishing on hardened steel, carbide plate, ceramics. Parallelism, perpendicularity, finish. Common for die plates, fixturing, and gage blocks.
Grinding pairs with everything.
Most ground parts arrive from milling or turning first. The platform routes the part through both ops in one job.
CNC milling
Rough the part, harden, then surface or jig grind to print.
/ CapabilityCNC turning
Turn shafts close to size, OD-grind to tolerance and finish.
/ CapabilityWire EDM
Cut hardened blanks on wire, then surface grind faces to spec.
/ IndustryAerospace
Bearing journals, control-surface pins, hardened structural pieces.
Precision grinding questions, answered.
What types of grinding does K+G do?
OD, ID, jig, and surface grinding. Cylindrical and centerless for round work, flat grinding for parallel surfaces and dies.
What surface finishes can you achieve?
Down to 4 µin Ra on precision grinding. 8–16 µin Ra is the standard production target. Mirror finishes available with a lapping pass.
What materials do you grind?
Hardened tool steels (D2, M2, A2), carbide, ceramic, hardened stainless. Anything wear-resistant or post-heat-treat that needs tight finish or tight tolerance.
When should I grind vs. mill or turn?
Grind when the tolerance is tighter than ±0.0002″, the surface finish is critical, or the material is too hard for cutting tools. Otherwise mill or turn — it's faster and cheaper.
Typical lead time for ground parts?
Quote in 24 hours. Standard 4–6 weeks including heat-treat partner cycle. Rush in 1–2 weeks if the heat-treat schedule permits.
Send the print. Quote in 24 hours.
Grind quotes need finish callout, hardness, and datum scheme — STEP + PDF is ideal.