Product Parameters
| Item | Specification |
|---|---|
| Material | Stainless Steel (303, 304, 316, 410) |
| Thread | Metric (M2–M24), Imperial (#0–1") |
| Surface | Passivated |
| Standard | ASTM A380, ASTM A967 |
| Application | Food processing, medical, marine, chemical processing |
| MOQ | 50 pcs |
description
Passivated stainless screws have the chromium oxide layer restored after machining - the passivation process removes free iron and other contaminants from the surface and allows the chromium to reform the protective oxide layer that gives stainless steel its corrosion resistance. Without passivation, machined stainless parts can corrode prematurely. 303, 304, and 316 stainless are the most common screw materials. 303 free-machines well but is not as corrosion-resistant as 304. 304 is the standard for general corrosion resistance. 316 adds molybdenum for chloride resistance - the right choice for marine and food processing with salt exposure.
Why Choose Us
Stainless steel is called stainless because of its chromium content - the chromium forms a protective oxide layer that resists corrosion. Machining generates heat, which can deplete chromium at the surface and leave free iron that corrodes. Passivation removes that free iron and lets the chromium reform its oxide layer. Without passivation, a machined stainless screw can look good at assembly and then rust in storage.
FAQ
Q1: MOQ?
A1: 50 pieces for standard screws.
Q2: Materials?
A2: 303, 304, 316, 410 stainless steel.
Q3: Passivation standards?
A3: ASTM A380 and ASTM A967 compliant processes.
Q4: Applications?
A4: Food processing, medical, marine, chemical processing.
Q5: Surface finish?
A5: Passivated - clean, corrosion-resistant surface with natural stainless appearance.
Q6: Custom configurations?
A6: Yes. Custom sizes, thread specifications, head styles.
Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.
- ISO 13485 - Full FDA compliance support; quality management system for medical device components
- ISO 11607 / FDA 21 CFR 820 - Packaging and sterilization validation for implantable and surgical devices
- ASTM F136 / F67 - Material specification compliance for implant-grade titanium and stainless
- First Article Inspection (FAI) - Full dimensional and functional report for every medical component
- Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
- Material Traceability - Heat number tracking from raw material to finished part
From raw material to finished product, every step is controlled and documented:
- Material Preparation - CNC turning/milling to near-net shape
- Heat Treatment - Through-hardening or case-hardening for strength-critical parts
- Surface Preparation - Degreasing, acid cleaning, and surface activation
- Electroplating - Controlled bath process with thickness monitoring
- Sealing / Baking - Chrome sealing, anodize sealing, or hydrogen embrittlement relief baking
- Inspection - Coating thickness measurement, adhesion testing, and visual check
- Packaging - Protective interleaving, VCI packaging, and anti-tarnish wrapping
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