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Home > Products > Custom Standoff Spacers > Stainless Steel Standoffs
Stainless Steel Standoffs

Stainless Steel Standoffs

Stainless Steel Standoffs are cylindrical or hexagonal spacers used to create precise gaps between components in electronic, mechanical, or architectural assemblies. Made from corrosion-resistant stainless steel, they offer durability, strength, and aesthetic appeal. Available in male-female or female-female configurations, standoffs provide threaded connections for secure fastening. Common applications include PCB mounting, rack systems, and enclosure designs. Their non-conductive properties and resistance to harsh environments make them ideal for industrial, marine, or outdoor use. Customizable in length, diameter, and thread size, stainless steel standoffs ensure reliable spacing and alignment while enhancing structural integrity.
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What Are Stainless Steel Standoffs?

Stainless steel standoffs are precision-engineered fasteners designed to create space between two mounted components while providing robust structural support. These cylindrical spacers typically feature male-female threading (ranging from M2 to M12 metric threads or #4-40 to 1/2"-13 UNC/UNF imperial threads) and are manufactured from high-quality austenitic stainless steel grades, mainly 304 (1.4301) and 316 (1.4401), known for their superior corrosion resistance and mechanical strength.

Stainless Steel Standoffs

Product Features & Technical Characteristics

Material Properties

  • Grade 304 Stainless Steel: Contains 18-20% chromium and 8-10.5% nickel, offering excellent corrosion resistance in most environments.

  • Grade 316 Stainless Steel: Includes 2-3% molybdenum for enhanced resistance to pitting and chloride corrosion, ideal for marine and chemical applications.

Mechanical Strength

  • Tensile Strength: Ranges from 515-690 MPa for 304 grade and up to 827 MPa for 316 grade.

  • Yield Strength: Approximately 205 MPa for 304 and 240 MPa for 316 stainless steel.

Temperature Resistance

  • Continuous service temperatures range from -200°C to 800°C, with intermittent exposure possible up to 925°C without loss of structural integrity.

Surface Finish

  • Standard finishes include #4 brushed finish (Ra 0.4-0.8 μm) or polished finish (Ra ≤ 0.2 μm).

  • Optional passivation treatment per ASTM A967 enhances corrosion resistance by forming a protective oxide layer.

Dimensional Tolerances

  • Manufactured to ±0.05 mm concentricity tolerance and ±0.1 mm length tolerance, ensuring precise alignment and fit.

Electrical Properties

  • Volume resistivity of 0.73 μΩ·m at 20°C makes stainless steel standoffs suitable for grounding and electrical shielding applications.

Machining Process

Our stainless steel standoffs are fabricated using advanced CNC machining technology, ensuring:

  • Precision turning and threading to meet ISO metric and UNC/UNF thread standards.

  • Passivation to boost corrosion resistance and surface quality.

  • Rigorous inspection with Go/No-Go thread gauges and coordinate measuring machines (CMM).

  • Various surface finishes including polishing, black oxide coating, or customized treatments as requested.


Applications

Electronics & Telecommunications

  • Provide 3-10 mm clearance for heat dissipation in PCB mounting.

  • Serve as EMI/RFI shielding components through continuous metal contact.

  • Used in server racks with M6 standoffs supporting up to 500N axial load for heavy equipment.

Architectural Glazing

  • Employed in structural glazing with M10-M12 316L stainless steel standoffs, able to withstand coastal corrosion.

  • Comply with European Standard EN 1993-1-4, transferring wind loads up to 3.5 kN/m².

Medical Equipment

  • 316LVM standoffs compliant with ISO 13485 for surgical tools and implants.

  • Surfaces electropolished to Ra ≤0.15 μm reduce bacterial adhesion, ideal for autoclave sterilization.

Transportation

  • Railway applications use standoffs meeting DIN 5510-2 fire ratings.

  • Marine applications require ASTM F593 compliance for exposure to saltwater.

Industrial Machinery

  • Food processing equipment utilizes standoffs certified by 3-A Sanitary Standard 18-03, featuring radius corners and full penetration welds for hygienic design.

Other Industries

  • Aerospace, optical equipment, and any environment demanding high corrosion resistance and mechanical strength.

Maintenance Procedures

Cleaning Protocols

  • Routine cleaning with isopropyl alcohol (70-99%) and lint-free wipes.

  • For marine environments, remove salt deposits using a 5% acetic acid solution.

  • Re-passivate every 12-24 months with 20-50% nitric acid following ASTM A967 Method C.

Inspection Criteria

  • Conduct quarterly inspections verifying:

    • Thread engagement ≥ 1.5× nominal diameter.

    • Absence of visible crevice corrosion (ASTM G78).

    • Torque values within ±10% of installation specs.

Replacement Indicators

  • Replace standoffs if:

    • Pitting exceeds 0.1 mm depth (ASTM G46).

    • Thread deformation is greater than 15% of pitch diameter.

    • Evidence of galvanic corrosion between dissimilar metals.

Lubrication Requirements

  • For threaded parts, apply:

    • Molybdenum disulfide (MoS₂) grease for high temperatures above 400°C.

    • PTFE-based lubricants for food-grade and sanitary environments.

    • Maintain lubricant film thickness of 25-50 μm.

FAQ

Q1: What thread sizes are available for stainless steel standoffs?
A1: We offer metric threads (M2–M12) and imperial threads (#4-40 to 1/2"-13 UNC/UNF), with custom sizes available.


Q2: Are these standoffs suitable for marine environments?
A2: Yes, especially 316 stainless steel standoffs, which provide superior chloride and saltwater resistance.


Q3: Can these standoffs be used in medical applications?

A3: Absolutely. We provide 316LVM standoffs with electropolished finishes compliant with medical sterilization standards.


Q4: How often should maintenance be performed?
A4: Cleaning and inspection should be done quarterly, with passivation every 1-2 years depending on the environment.


Q5: What surface finishes are available?
A5: Standard finishes include brushed (#4), polished, passivated, and black oxide coatings. Custom finishes are also possible.

Cost-efficient Machined Parts at Any Quantity

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