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Die casting drawing notes

15 copy-ready notes for die casting (inch and metric), in English and Spanish. Copy a note, replace the [bracketed] example values, and check the "Watch for" line before you release the drawing.

Values in [brackets] are examples; replace them with your own. Notes marked Verify values rely on common practice; confirm them with your supplier or design engineer. These notes are examples, not an engineering approval of your drawing.

DCS-01 AlloyDCS-02 Recycled content and certificationDCS-03 Surface qualityDCS-04 DraftDCS-05 Draft directionDCS-06 Flash and trim by locationDCS-07 Parting line mismatchDCS-08 Gate vestige and ejector marksDCS-09 Internal soundnessDCS-10 Pressure tightnessDCS-11 Machining stockDCS-12 Casting tolerances (metric)DCS-13 Fillets and wallsDCS-14 Cast-in markingDCS-15 Tool approval

DCS-01

Alloy

Checked
EN
MATERIAL: ALUMINUM ALLOY [A380] PER ASTM B85. Zinc: [ZAMAK 3] PER ASTM B86. Magnesium: [AZ91D] PER ASTM B94.
ES
MATERIAL: ALEACIÓN DE ALUMINIO [A380] SEGÚN ASTM B85.

Use: every die casting. Asian supply chains often quote ADC12 (JIS H5302), close to A383.

Watch for: "DIE CAST MAGNESIUM" with no alloy; UNS written with the letter O (A03800, not AO3800); recycled content not stated when it matters.

Basis: ASTM B85, B86, B94. checked

DCS-02

Recycled content and certification

Verify values
EN
REUSED (REMELT) MATERIAL [10]% MAX. CHEMICAL CERTIFICATION PER HEAT REQUIRED.
ES
MATERIAL REUTILIZADO (REFUNDIDO) [10]% MÁX. SE REQUIERE CERTIFICADO QUÍMICO POR COLADA.

Basis: convention. verify

DCS-03

Surface quality

Verify values
EN
AS-CAST SURFACE: NADCA CLASS [3] UNLESS NOTED. SURFACES MARKED [△23]: CLASS [4].
ES
SUPERFICIE DE FUNDICIÓN: CLASE NADCA [3] A MENOS QUE SE INDIQUE. SUPERFICIES MARCADAS [△23]: CLASE [4].

Use: every die casting; classes run from utility to superior.

Watch for: "PER NADCA G-6-6-97" — superseded; cite the current NADCA Product Specification Standards (PUB-402, 2024).

Basis: NADCA 2024 standards. checked; class numbering in the 2024 book: verify

DCS-04

Draft

Verify values
EN
DRAFT [1]° PER SIDE UNLESS NOTED. CORED HOLES [0.5]°.
ES
SALIDA [1]° POR LADO A MENOS QUE SE INDIQUE. BARRENOS DE CORAZÓN [0.5]°.

Watch for: draft written as a maximum with no reason; "MINIMUM DRAFT REQUIRED".

Basis: NADCA design guidance; values are examples. verify

DCS-05

Draft direction

Verify values
EN
[+] INDICATES DIMENSION PLUS DRAFT. [–] INDICATES DIMENSION MINUS DRAFT.
ES
[+] INDICA DIMENSIÓN MÁS SALIDA. [–] INDICA DIMENSIÓN MENOS SALIDA.

Basis: convention. verify

DCS-06

Flash and trim by location

Verify values
EN
FLASH AFTER TRIM: PARTING LINE [.010] MAX, CORED HOLES [.010] MAX, GATES AND OVERFLOWS [.030] MAX, EJECTOR PINS [.008] MAX.
ES
REBABA DESPUÉS DEL DESBARBADO: LÍNEA DE PARTICIÓN [.010] MÁX., BARRENOS DE CORAZÓN [.010] MÁX., COMPUERTAS Y REBOSADEROS [.030] MÁX., BOTADORES [.008] MÁX.

Use: every die casting. Pair with flags: "FLASH OK" = FLASH AND MISMATCH PERMITTED PER NOTE [__]. "NO FLASH" = NO FLASH OR MISMATCH PERMITTED.

Basis: NADCA published commercial trim values are close to these (parting line .015, cored holes .010, thin gates .03, thick gates .06). checked (NADCA); your values are tighter. verify

DCS-07

Parting line mismatch

Verify values
EN
PARTING LINE MISMATCH [.010] MAX. Metric: [0.05] MM MAX ON EXTERIOR SURFACES.
ES
DESALINEACIÓN EN LÍNEA DE PARTICIÓN [.010] MÁX.

Basis: convention; NADCA tables give values by part size. verify

DCS-08

Gate vestige and ejector marks

Checked
EN
GATE VESTIGE [.002] ABOVE TO [.010] BELOW SURFACE. EJECTOR MARKS ±[.015].
ES
VESTIGIO DE COMPUERTA [.002] SOBRE A [.010] BAJO LA SUPERFICIE. MARCAS DE BOTADOR ±[.015].

Watch for: "GATE VESTIGE: TBD".

Basis: NADCA cites ejector marks ±.015. checked

DCS-09

Internal soundness

Verify values
EN
RADIOGRAPHIC INSPECTION OF ZONES MARKED [△24] PER ASTM E505, ACCEPTANCE LEVEL [2].
ES
INSPECCIÓN RADIOGRÁFICA DE LAS ZONAS MARCADAS [△24] SEGÚN ASTM E505, NIVEL DE ACEPTACIÓN [2].

Watch for: the old "CATEGORY A POROSITY / B COLD FILL / C SHRINKAGE / D FOREIGN MATERIAL" list — check category letters against E505-22 before reusing.

Basis: ASTM E505-22 current. checked; category letters: verify

DCS-10

Pressure tightness

Verify values
EN
LEAK TEST AT [5] PSIG AIR: LEAK RATE [___] MAX. IMPREGNATION PER MIL-STD-276 [PERMITTED / NOT PERMITTED].
ES
PRUEBA DE FUGA A [5] PSIG DE AIRE: FUGA [___] MÁX. IMPREGNACIÓN SEGÚN MIL-STD-276 [PERMITIDA / NO PERMITIDA].

Use: housings that hold fluid or gas.

Basis: NADCA: pressure tests commonly 5–40 psi, method agreed in advance. checked; MIL-STD-276 current revision: verify

DCS-11

Machining stock

Verify values
EN
MACHINING STOCK [.020–.040] ON SURFACES MARKED [△25]. ALL MACHINED SURFACES FREE OF EXPOSED POROSITY LARGER THAN [Ø.020].
ES
SOBREMATERIAL DE MAQUINADO [.020–.040] EN SUPERFICIES MARCADAS [△25]. SUPERFICIES MAQUINADAS SIN POROSIDAD EXPUESTA MAYOR A [Ø.020].

Basis: convention. verify

DCS-12

Casting tolerances (metric)

Checked
EN
GENERAL CASTING TOLERANCES: ISO 8062-3, DCTG [5].
ES
TOLERANCIAS GENERALES DE FUNDICIÓN: ISO 8062-3, DCTG [5].

Basis: ISO 8062-3:2023 (DCTG 1–15). checked; grade is an example.

DCS-13

Fillets and walls

Verify values
EN
FILLETS AND RADII R[.030] UNLESS NOTED. WALL AND RIB THICKNESS PER MODEL.
ES
RADIOS R[.030] A MENOS QUE SE INDIQUE. ESPESOR DE PARED Y COSTILLAS SEGÚN EL MODELO.

Watch for: "FILLETS .010 MAX" on a die casting — sharp corners shorten tool life.

Basis: convention. verify

DCS-14

Cast-in marking

Verify values
EN
CAST IN: PART NUMBER, CAVITY ID, DATE PLUG AND RECYCLING SYMBOL AT [△26]. REVISION ON A CHANGEABLE INSERT.
ES
FUNDIR EN LA PIEZA: NÚMERO DE PARTE, IDENTIFICACIÓN DE CAVIDAD, FECHADOR Y SÍMBOLO DE RECICLAJE EN [△26]. REVISIÓN EN INSERTO INTERCAMBIABLE.

Basis: convention. verify

DCS-15

Tool approval

Verify values
EN
TOOL DESIGN, PARTING LINE, GATE, OVERFLOW AND EJECTOR LOCATIONS TO BE APPROVED BY [CUSTOMER] BEFORE TOOL CONSTRUCTION.
ES
EL DISEÑO DEL MOLDE, LÍNEA DE PARTICIÓN, COMPUERTAS, REBOSADEROS Y BOTADORES DEBEN SER APROBADOS POR [CLIENTE] ANTES DE CONSTRUIR EL MOLDE.

Basis: convention. verify

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