G10 Machined Parts

G10 is the workhorse of the electrical-grade fiberglass laminates — a woven-glass/epoxy composite that machines cleanly, holds tight tolerances, and delivers reliable dielectric performance across a wide temperature range. When your design calls for a precision-machined insulator, structural bracket, or mechanical component that must also resist moisture and track, G10 is the default choice.

Federal Materials machines G10 to customer prints from standard stock rod, sheet, tube, and plate. Whether you need one prototype or a production run, our CNC turning and milling cells hold the same tolerances, and every electrical part is dielectric-tested before it ships.

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What We Machine in G10

Standoffs and spacers — round, hex, and square profiles; threaded or through-bore
Insulators and insulating plates — custom contours, cutouts, and slot patterns
Bushings and sleeves — close-tolerance ID/OD for bearing and guide applications
Arc barriers and arc chutes — contoured profiles for switchgear and circuit breaker assemblies
Structural brackets and mounting plates — drilled, tapped, counterbored to print
Terminal boards and panel substrates — drilled grid patterns, edge routing
Washers and shims — flat and step-ground, any OD/ID combination
Custom profiles and prototypes — one-off and short-run from sheet or rod stock

Typical Tolerances

Dimension type	Production tolerance
Critical turned dims (OD/ID)	±0.0005"
General machined dims	±0.005"
Thread form	2B/3B class per print
Flatness (plates ≤ 12")	±0.003"
Surface finish	125 µin Ra standard; 63 µin on request

Tighter tolerances are available on specific features — note them on your print or RFQ and we will confirm feasibility.

Finish Options

Finish	Description
As-machined	Natural G10 surface — clean, deburred, edges broken
Machined-to-spec edges	Chamfered or radiused edges per drawing callout
Painted / marked	Customer-specified coating or marking (consult application engineering)
No surface treatment	G10 does not require passivation or plating

G10 does not absorb oils or solvents under normal machining conditions. Cut edges are sealed by the epoxy matrix; no additional edge sealing is required for most electrical applications.

Standard Turnaround

Stage	Lead time
Quote response	Same business day (standard RFQs)
Prototype / first article (1–5 pcs)	3–5 business days
Short run (6–50 pcs)	5–10 business days
Production run (50+ pcs)	10–15 business days

Expedite available — contact us at time of RFQ. Lead times assume stock material on hand; see stock table below.

Materials We Stock (G10 Stock Shapes)

Form	Sizes available	Notes
Sheet / plate	0.031" – 4.000" thick; up to 48" × 96"	NEMA G10, MIL-I-24768/2 GP03
Rod	¼" – 6" diameter	Turned from rod for round parts
Tube	Various OD/wall; call for availability	For sleeve and bushing blanks
Machined blanks	Custom sawn-to-size blanks	Reduces turn time on large runs

Stock is maintained in commercial-grade G10 meeting NEMA LI-1 Grade G10 and MIL-I-24768 Type GP03. FR4 is stocked separately — see FR4 Machined Parts for flame-retardant-grade parts.

Quality & Inspection

Every G10 machined part order includes:

Dimensional inspection — first-article CMM report available on request; in-process and final inspection per print
Dielectric withstand testing — available for electrical insulators and switchgear components (specify on RFQ)
Material certification — mill cert or C of C tracing heat/lot to NEMA LI-1 Grade G10 or MIL spec
Visual and surface inspection — delamination check, burr-free edges, surface finish verification
Packaging — parts individually protected for thread and bore features; moisture-barrier packaging on request

We operate a documented quality system with full traceability from raw stock to shipped part.