A shot sleeve moving from a die-cast toolroom into a CNC machine shop should not travel with a quote and a CAD file alone; it should travel with a four-pillar certification packet covering material pedigree, heat-treat evidence, dimensional capability, and the machining supplier's registration scope, per the September 2026 Modus Advanced machine-shop vetting guidance [S1].
The typical scope is one sleeve per cold-chamber die-cast machine, machined from H-13 tool steel to NADCA #207-90, vacuum-furnace heat-treated to 46-48 Rc with an optional 0.010-0.012 in gas-nitrided case [S5], with an inner bore and pour-hole geometry ground (not merely turned) for concentricity before the sleeve leaves the toolroom [S5].
Material Pedigree: H-13, MTC, and Mill-Heat Lot
Material pedigree is the first hard filter, and the first document on the handoff stack: a Mill Test Certificate (MTC) or Material Test Report (MTR) tied to the actual heat number stamped on the sleeve face [S4][S5]. H-13 per NADCA standard #207-90 is the dominant die-cast shot-sleeve grade in North American toolrooms, and Precision Tool Company specifies it as the default for all standard, grooved, and threaded sleeve variants [S5].
The MTC must show the smelter, the heat number, the chemistry (Cr, Mo, V within the H-13 envelope), and the annealed-as-supplied hardness; a shop that cannot produce an MTC conforming to ASTM, AMS, or ISO cannot certify that the bore will respond uniformly to vacuum heat treat, and the sleeve is rejected before any machining begins [S4]. For sleeves that pair a Copromec-style replaceable insert or thermoregulated circuit, the MTC stack must cover both the body forging and the insert blank separately, with the supplier confirming "certified material" and "certified production process" in writing [S3].
Heat-Treat Evidence: Vacuum Furnace, Temper Cycle, and Case Depth
Heat-treat evidence is the second filter and the one most often faked on a paper-only handoff: a vacuum-furnace chart showing preheat to 1550 F, ramp to 1850 F, a soak of one hour per inch of cross section, a cool in air or nitrogen, and a first temper at 1100 F that lands the sleeve at 48-51 Rc before a mandatory second temper drops the working hardness to 46-48 Rc [S5].
Two specifics separate a real chart from a templated one: the soak-time math versus the actual cross section on the drawing, and the second-temper line item, since omitting the second temper is the single most common cause of premature bore checking in service. If the sleeve is gas-nitrided, the chart must also record a case depth of at least 0.010-0.012 in [S5], and the nitrided sleeve must be re-stamped on the pour-hole face for traceability, matching the same identification convention used for the through-hardness part [S5]. A sleeve supplied without a furnace-chart PDF, a temper-time log, and a post-temper hardness reading (file or portable Rockwell) is not a qualified handoff.
Dimensional and Process Capability: CMM, Cpk, and Concentricity by Grinding
Dimensional evidence is the third filter: a CMM inspection report on the finished sleeve, supported by a calibration certificate for the CMM itself dated within the supplier's stated calibration interval [S4]. The shop must be able to demonstrate a stable dimensional tolerance of at least +/-0.01 mm on critical bore features and supply Cpk (Process Capability Index) data of 1.33 or higher for any feature held across a production batch [S4].
For shot sleeves specifically, the bore-to-OD concentricity is the feature that determines die-cast machine alignment, and the only credible way to hold it is to grind the OD and ID to finish size after heat treat rather than relying on a final turning pass [S5]. The handoff packet must list the concentricity number (typically held under 0.001-0.002 in TIR on a production sleeve) on the inspection report, not in a separate cover letter, so the receiving CNC shop can verify it against its own incoming CMM run before any milling work begins. The same incoming-inspection rule that applies to a shot blasting machine housing or any other precision tool component applies here: a shop that cannot measure the part cannot control it [S1].
Supplier Registration Scope: AS9100, ISO 9001, ITAR, and the Right Certificate Scope
Supplier registration is the fourth filter and the easiest to get wrong by reading the certificate but not the scope statement [S1]. The minimum stack for any shop touching a flight-adjacent or defense-adjacent die-cast program is AS9100 Rev D, ISO 9001, and ITAR registration, each with a current certificate, an accredited registrar (ANAB or equivalent), and a scope statement that explicitly covers the process family and material types in the work scope [S1].
An AS9100 certificate scoped to "design and manufacture of electronic assemblies" does not cover a bare machined H-13 sleeve, and accepting it on the face of the document is a common audit finding [S1]. For programs that carry Controlled Unclassified Information (CUI), Cybersecurity Maturity Model Certification (CMMC) Level 2 assessed by an authorized C3PAO is a hard filter: the CMMC Program final rule became effective December 16, 2024, and contract requirements began appearing in Q3 2025, so a non-compliant single manufacturer can disqualify an entire contract bid [S1]. DFARS specialty-metals compliance is a parallel check that the H-13 melt source is on the qualified list, not a substitute for the AS9100 scope statement. For a broader walkthrough of how those registrations line up against the rest of a toolroom's safety certification stack, the same pass/fail logic applies.
Decision Matrix: What to Pass, What to Reject, What to Conditional-Release
Comparing the four pillars side by side, a sleeve passes handoff when MTC + vacuum-furnace chart + CMM report + matching AS9100 scope are all present and consistent, fails when any one pillar is missing, and lands in conditional-release only when the missing item is a nitriding case-depth log or a Cpk file that can be re-issued within 48 hours. Material evidence is the highest-weight pillar because a chemistry mismatch cannot be fixed downstream; heat-treat evidence is second because a missed second temper is invisible until the bore checks; dimensional evidence is third because the receiving CMM will catch a bad concentricity number on the first part; supplier registration is fourth in technical risk but first in contract risk, since a scope mismatch on AS9100 voids the paperwork even when the parts are good [S1][S4][S5].
The "certified material" plus "certified production process" wording on a Copromec-style supplier data sheet [S3] is a useful shorthand but is not a substitute for the four underlying documents, and treating it as one is the most common shortcut that ends in a sleeve being returned mid-program. A shot sleeve supplied without a face-stamp traceable to a heat number and a furnace chart is, for machining-handoff purposes, an unverified blank.
Handoff Packet: File List, Naming, and What the Receiving Shop Verifies
The handoff packet itself should travel as a single zipped folder with a fixed file order: 01_Drawing_PDF, 02_MTC_HeatNumber, 03_VacuumFurnace_Chart, 04_Nitride_CaseDepth (if applicable), 05_CMM_Report, 06_AS9100_Certificate_and_Scope, 07_CMM_Calibration, 08_Shop_Cpk_Summary, with each file named for the sleeve serial number stamped on the pour-hole face [S4][S5]. The receiving shop opens the folder, confirms the face-stamp matches every filename, runs a one-feature CMM check on the bore diameter, and only then releases the sleeve to the CNC queue [S4].
For RFQ-stage work, the same checklist collapses to a four-question pre-screen: does the shop hold AS9100 Rev D with the right scope [S1], can it show a CMM calibration and a Cpk of 1.33 or better on past similar work [S4], will it accept an MTC tied to a specific H-13 heat number, and does its heat-treat partner run a vacuum furnace with a documented two-temper cycle. A "yes" on all four qualifies the shop to quote; a "no" on any one ends the evaluation before drawings change hands [S1][S4]. Engineers who want a parallel checklist for an adjacent certification workflow, such as a chemical anchor certification checklist, will recognize the same four-pillar logic applied to a different component family.
Trackable signals to watch over the next sourcing cycle: whether more NADCA-compliant toolrooms start publishing vacuum-furnace charts as standalone PDFs (rather than as a line in a generic data sheet), and whether AS9100 scope statements at Tier-2 die-cast machine shops are being reissued to explicitly name H-13 tool-steel sleeve production rather than the generic "tooling" wording that still shows up on certificates issued before 2024.