In the automotive industry, how exactly do you distinguish between OTS, prototype parts, tooling components, and mass-production parts?
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Release time:
Sep 30,2026
Understand the differences at a glance with one table.
1. OTS: It stands for “graduation certificate,” not “parts.”
OTS (Off Tooling Samples) refers to tooling‑derived sample parts. OTS parts must be produced using the official (hard) molds and on the production‑line tooling equipment, with the purpose of demonstrating that your molds and manufacturing line can consistently produce components that meet the design specifications. Key points: OTS parts are typically produced in small quantities—ranging from a few dozen to a few hundred—and are primarily used for DV/PV testing and dimensional verification. Obtaining OTS approval (OTS Release) signifies that your tooling has successfully “graduated.”
2. Sample: It’s a “generic term,” entirely dependent on the prefix.
A “sample” is actually a generic term, much like the word “car”—its specific meaning depends on the modifier that precedes it. A handcrafted prototype: made without a mold, using 3D printing, sheet-metal assembly, or even modeling clay. As long as it looks the part and can be mounted on the vehicle for fit‑and‑function testing, that’s sufficient. It cannot be used for durability‑validation (DV) testing—unless under special arrangements—because it does not represent production‑level conditions. Soft tooling: to accelerate development, parts are produced using low‑cost molds with limited lifespan and slightly lower precision. These components are typically employed for early‑stage fit‑and‑function verification or bench‑testing.
3. Work-in-progress: It is a “state,” not necessarily a “finished product.”
Tooling Part. Any component produced using molds, jigs, or inspection fixtures—collectively referred to as tooling—is classified as a tooling part. Scope: This category encompasses both OTS parts and small‑batch components from the PPAP phase. Distinction: The term “tooling part” emphasizes the production tooling itself. Sometimes, even when the mold has not yet been fully finalized (during T2 or T3 stages), the parts produced are still designated as tooling parts; however, at this stage, their dimensions may be unstable, and they cannot yet be used directly for PV testing.
4. Production‑run parts: They are both “products” and “evidence.”
Production Part refers to the parts produced after the Start of Production (SOP). It is manufactured using the official tooling, on a full‑scale production line, by trained operators, following a standardized operating procedure (SOP), and has passed all required inspections. The core principle: these parts are intended for sale to customers. They must be 100% conforming and fully traceable—e.g., marked with the mold number, production date, and batch number. Special use case: during the small‑batch production phase following PPAP approval (Run@Rate), the parts produced are also considered production parts, used to validate the production line’s cycle time and stability.
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