Rockwell Hardness Measurement
NIST SP 960-5 (2001). Recommended practices for Rockwell hardness measurement of metallic materials. Use with the current test-method standards and project inspection requirements.
PDF • External source ↗ Open PDFDownloads
Browse public engineering references and archived documents. Technical PDFs link to official sources. Archived certificates show their original holders and dates; they are historical records, not evidence of current GD Prototyping certification.
Forming Potential of Stainless Steel
Euro Inox, 1st edition (2006), hosted by worldstainless. Overview of stainless steel forming, mechanical properties and application examples, including hydroforming, spinning and deep drawing.
PDF • External source ↗ Open PDFGuide to Stainless Steel Finishes
Euro Inox, 3rd edition (2005), hosted by worldstainless. Illustrated reference to stainless steel surface finishes, with examples focused on building and architectural applications.
PDF • External source ↗ Open PDFTPU Injection Molding Guide
Covestro: Processing of TPU by Injection Molding. Covers drying, processing, tooling and secondary operations for Covestro TPU grades; confirm current grade-specific recommendations.
PDF • External source ↗ Open PDFPowder Bed Fusion Activity Model
NIST AMS 100-60 (2024). Activity model for powder bed fusion, covering design, process planning, manufacturing, post-processing and evaluation. Not a part-design tolerance standard.
PDF • External source ↗ Open PDFMeasurement Uncertainty Guide
NIST TN 1297 (1994 edition). Guidelines for evaluating and expressing measurement uncertainty. A metrology reference, not a general machining tolerance chart.
PDF • External source ↗ Open PDF
Historical IATF 16949 Certificate
Historical record. Holder: BEST PROTOTYPES MANUFACTURINGCO., LIMITED. Expired 2025-10-11. Certificate T179057 / IATF 0459611. Not evidence of current GD certification.
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Historical D-U-N-S Registration
Historical record. Holder as printed: 东莞市冠速模型科技有限公司. D-U-N-S 554460700; displayed period: Nov 2018-Nov 2020. Not a current GD registration claim.
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Historical ISO 9001 Certificate
Historical record. Holder: Dongguan GJ Precision Technology Co., LTD. Certificate 19822QF4222R0S; expired 2025-05-31. Not evidence of current GD certification.
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Historical Patent Document (Page 1 of 2)
Historical record. Patentee: 东莞市冠速模型科技有限公司. ZL202022829708.1. Page 1 of 2 only; current status unverified. Not a management-system certificate.
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Historical Certificate Collage
Historical collage naming 东莞市冠速模型科技有限公司. Includes expired high-tech certificates. Displayed logos are not claims of current GD certification.
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