Board Spacers, Standoffs

Image	Part Number	Description / PDF	Quantity	Rfq
	R40-6001502 Harwin	ROUND SPACER M4 BRASS 15MM	0
	R40-1001502 Harwin	HEX STANDOFF M4X0.7 BRASS 15MM	0
	R4456-02 Harwin	CONNECTOR HARDWARE	0
	R40-1000702 Harwin	HEX STANDOFF M4X0.7 BRASS 7MM	0
	R6125-02 Harwin	952-3455-ND	0
	R106111C Harwin	HEX STANDOFF	0
	R106843C Harwin	HEX STANDOFF	0
	R4427-02 Harwin	CONNECTOR HARDWARE	0
	R106934C Harwin	HEX STANDOFF	0
	R6354-02 Harwin	952-1523-ND	0
	R30B3002502 Harwin	HEX STANDOFF	0
	R6303-02 Harwin	ROUND STANDOFF M3X0.5 BRASS 8MM	0
	R4485-02 Harwin	CONNECTOR HARDWARE	0
	R106777C Harwin	HEX STANDOFF	0
	R50-3005002 Harwin	CONNECTOR	0
	R4421-02 Harwin	CONNECTOR HARDWARE	0
	R40-4002002 Harwin	HEX STANDOFF M4X0.7 BRASS 20MM	0
	R4755-02 Harwin	ROUND STANDOFF 4BA BRASS 3/4"	0
	R30-5000502 Harwin	ROUND STANDOFF M3X0.5 BRASS 5MM	0
	R30-3015002 Harwin	R30-3012002-ND	0

Board Spacers, Standoffs

1. Overview

Board spacers and standoffs are specialized hardware components used to create controlled spacing between printed circuit boards (PCBs), panels, or structural elements. They provide mechanical support, electrical isolation, and thermal management in electronic assemblies. Their importance in modern technology includes enabling compact designs, reducing vibration stress, and improving heat dissipation in devices ranging from smartphones to industrial control systems.

2. Main Types & Functional Classification

Type	Functional Features	Application Examples
Cylindrical Spacers	Simple tubular design with uniform diameter	PCB layer separation in consumer electronics
Hexagonal Standoffs	6-sided structure for wrench tightening	Industrial equipment panel mounting
Self-clinching Standoffs	Permanent installation with threaded compression	Sheet metal enclosures in servers
Adjustable Spacers	Variable length through threaded adjustment	Prototype development and testing
Insulated Spacers	Non-conductive materials for electrical isolation	High-voltage power supply assemblies

3. Structure & Composition

Typical construction includes:

Material: Stainless steel (corrosion resistance), aluminum (lightweight), or nylon (insulation)
Geometry: Cylindrical (standard), stepped (for multiple board heights), or flanged (for load distribution)
Installation Features: Internal threading (male/female), knurled surfaces (for grip), or press-fit tabs
Surface Treatment: Passivation (metal), UV resistance (plastics), or EMI shielding coating

4. Key Technical Specifications

Parameter	Importance
Material Hardness (HV)	Determines wear resistance and load capacity
Thread Engagement Length	Affects vibration resistance in dynamic environments
Thermal Conductivity (W/m K)	Critical for heat dissipation in power electronics
Dielectric Strength (kV/mm)	Safety factor in high-voltage applications
Installation Torque Rating	Prevents over-tightening damage to PCBs

5. Application Fields

Primary industries include:

Electronics Manufacturing: Server racks, LED displays
Automotive: Engine control units (ECUs), ADAS systems
Aerospace: Satellite PCB mounting, avionics enclosures
Medical Devices: MRI scanner internal structures
Consumer Electronics: Smartphone PCB stacking

6. Leading Manufacturers & Products

Manufacturer	Representative Product
PEM	S-8900 Series self-clinching standoffs
RS Components	486-8826 insulated hexagonal spacers
Mouser Electronics	925206-12 adjustable PCB spacers
McMaster-Carr	91285A102 stainless steel standoffs

7. Selection Recommendations

Evaluate mechanical load requirements vs material strength
Match thread type (UNC/UNF/Metric) with assembly hardware
Consider CTE (Coefficient of Thermal Expansion) compatibility with PCB materials
Select insulated variants for >50V circuits
Use vibration-damping coatings in mobile applications

8. Industry Trends

Emerging developments include:

Miniaturization: Sub-1mm spacers for wearable devices
Material Innovation: Conductive polymer composites for EMI shielding
Smart Integration: Standoffs with embedded strain gauges for structural monitoring
Automated Installation: Self-aligning designs for robotic assembly lines
Sustainability: Biodegradable plastic options (PLA-based) entering mainstream production