Gray iron
ASTM A48/A48M is a common U.S. specification for general engineering gray iron castings. State the exact standard edition and class on the drawing or RFQ.
US · OEM SOURCING GUIDE
Custom Iron Castings for U.S. OEM Buyers
U.S. buyers usually qualify a foundry by part risk, governing material specification, drawing revision, inspection evidence and total landed scope. This guide shows what to define before Anxin can assess a casting project.
Anxin Foundry · Reviewed 29 October 2026BUYER INTENT
What a United States buyer is actually trying to de-risk.
Discovery starts with a part, material or problem. Supplier selection then moves through drawing control, evidence, sample approval and delivery scope. The page is structured in that same order so buyers and answer engines can verify each claim.
China gray iron casting supplier for compressor housingsASTM A48 custom casting with CNC machiningASTM A536 ductile iron casting manufacturerDrawing-based iron castings for U.S. industrial OEMs
Use the buyer’s language, then verify the specification.
Ductile iron
ASTM A536 is a common U.S. specification for ductile iron castings. State the grade, required test basis and any section-specific requirements.
Dimensions
Identify whether dimensions and tolerances use inch-pound or SI units. Do not combine values from different systems unless the drawing explicitly controls the conversion.
Approval package
List any required first-article report, PPAP level, control plan, material report, dimensional layout or capability study. Availability and scope must be confirmed before quotation.
QUALIFICATION CHECK
Information that should exist before supplier approval.
- 01A controlled drawing revision and 3D model
- 02Exact material specification, class or grade
- 03Critical characteristics and inspection method
- 04Casting-only or casting-plus-machining scope
- 05Sample approval and recurring-order documentation
- 06Packaging, Incoterm and destination requirements
Verify the factory before discussing the order.
01
Actual component photographs
Representative castings, as-cast stages and machined interfaces.
02Manufacturing scope
Casting processes, machining resources and project boundaries.
03Quality credentials
IATF 16949 and ISO 9001 certificates plus inspection context.
04Legal entity and factory facts
Registered company identity, address, business scope and contact details.
RFQ INPUT
Send a package an engineer can review.
Include the information below with PDF, DWG, DXF, STEP, IGES or STL files. Anxin will respond with questions where the manufacturing or inspection boundary is unclear.
- 012D drawing, 3D model and controlled revision
- 02Material standard, grade, edition and test basis
- 03Annual volume, batch quantity and target delivery state
- 04Casting weight, critical wall sections and machining scope
- 05Special characteristics, inspection method and documents
- 06Destination, packaging, Incoterm and sample timing
BUYER QUESTIONS
Answers that define the boundary.
Can Anxin quote an ASTM grade from an HT or QT reference?
Send the governing ASTM specification and grade. Similar strength labels are not automatic equivalents; Anxin reviews the standard, section thickness, test basis and drawing requirements before confirming feasibility.
Can a U.S. buyer request PPAP or a first-article report?
Yes, include the requested PPAP level or first-article contents in the RFQ. Anxin will confirm which documents, samples and measurements can be included before the order.
Can one supplier cover casting and machining?
Anxin evaluates combined casting and machining projects. Machining datums, stock allowance, critical bores, threads, sealing faces and inspection points should be identified on the drawing.
What should be included for a landed-cost comparison?
State destination, annual demand, batch size, packaging, Incoterm, inspection documents and whether tooling, samples, machining or surface treatment are included.