Brass Hex Standoff

Brass Hex Standoffs are precision-machined threaded spacers used to separate and securely fasten components within mechanical and electronic assemblies. Featuring an internal thread at both ends and a hexagonal body for easy installation with standard tools (e.g., 5/16" or 1/4" wrench), these standoffs offer excellent Electrical conductivity, corrosion resistance, and mechanical strength. They are widely used in PCB mounting, industrial automation, telecommunications, medical devices, and aerospace systems.

Key Product Features

• Thread Sizes: Available in #4-40, #6-32, #8-32, #10-32, M3–M6 (custom threads on request)

• Hex Sizes: Common widths across flats: 1/4", 5/16", 3/8", or metric equivalents

• Length Range: 1/8" to 6" (3mm to 150mm), with tolerances of ±0.005" (±0.127 mm)

• Electrical Conductivity: 28–34% IACS, suitable for grounding and EMI shielding

• Thermal Rating: Operates from -200°C to +200°C with minimal mechanical degradation

• Cycle Life: Supports 50–100 installation cycles without galling or thread stripping

• Compliance: Meets ASME, RoHS, and MIL-STD fastener specifications

Precision Machining Process

Our Brass Hex Standoffs are manufactured using state-of-the-art CNC lathes and Swiss turning centers, followed by:

• Thread Tapping (UNC/UNF/Metric)

• Deburring & Edge Chamfering

• Hex Milling to ±0.002" accuracy

• Quality-Controlled Cleaning & Surface Prep

Machining is done under ISO 9001 and IATF 16949 protocols for full traceability and dimensional consistency.

Material Selection

We use C36000 Free-Machining Brass (CuZn39Pb3) — an industry-standard alloy known for its:

• High Machinability Index (100%)

• Copper Content: 58–65%

• Lead Content: 2.5–3.7% for improved chip breakage

• Mechanical Properties:

• Tensile Strength: 44–70 ksi (303–483 MPa)

• Yield Strength: 15–45 ksi (103–310 MPa)

• Hardness: 65–80 HRB

Optional materials include nickel-silver brass, CZ121, or RoHS-compliant low-lead variants upon request.

Surface Finishing Options

• Natural Brass (As-Machined) – Standard yellow-gold appearance

• Nickel Plating – Improves corrosion resistance, thickness: 5–12 μm

• Tin Plating – For improved solderability (electronics use)

• Clear Lacquer Coating – Reduces oxidation, maintains surface aesthetics

• Passivation or Wax Sealing – For long-term storage or high-humidity use

All finishes adhere to ASTM B700, MIL-C-26074, or IEC 60068 standards based on application.

Precision & Inspection Capabilities

Every batch undergoes:

• Dimensional Verification: CMM inspection with ±0.002" capability

• Thread Integrity Check: Using GO/NO-GO gauges per ASME B1.3M

• Visual Defect Inspection: 10x magnification for cracks, corrosion, burrs

• Conductivity Test: Verifying electrical contact resistance (<2 mΩ typical)

• Surface Roughness Test: Ra ≤ 1.6 μm for EMI-sensitive assemblies

Application Fields

• Cleaning: Use 70–99% isopropyl alcohol or neutral pH brass-safe detergents

• Corrosion Prevention: Apply microcrystalline wax or VCI paper for humid storage

• Thread Lubrication: MoS₂ or PTFE-based grease recommended for high-frequency mating

• Inspection Frequency: Every 5,000 hours of use or annual cycle, whichever is earlier

Frequently Asked Questions (FAQ)

Q1: What is the maximum torque these brass standoffs can withstand?
A: It depends on thread size, but generally up to 20 in-lb for M4 or #8-32 threads with proper installation.

Q2: Are these standoffs suitable for outdoor use?
A: Yes, especially with nickel plating or wax sealing, they perform well in IP54–IP67 rated enclosures.

Q3: Can I request custom lengths or threads?
A: Absolutely. We support custom orders with low MOQ and fast prototyping.

Q4: Do brass standoffs support high-frequency EMI shielding?
A: Yes. They offer 60–80 dB attenuation up to 1 GHz, suitable for sensitive electronics.

Q5: Are these standoffs RoHS compliant?
A: Yes, standard C36000 alloy meets RoHS; we also offer low-lead versions upon request.