Board Spacers, Standoffs

Part Number	Description / PDF	Quantity
R30-3003502 Harwin	HEX STANDOFF M3X0.5 BRASS 35MM	2997
R30-1001202 Harwin	HEX STANDOFF M3X0.5 BRASS 12MM	2565
R25-1001602 Harwin	HEX STNDFF M2.5X0.45 BRASS 16MM	4519
R40-3001202 Harwin	HEX STANDOFF M4X0.7 BRASS 12MM	3428
R40-3001602 Harwin	HEX STANDOFF M4X0.7 BRASS 16MM	457
R25-3001602 Harwin	HEX STNDFF M2.5X0.45 BRASS 16MM	0
R30-1611100 Harwin	HEX STANDOFF M3X0.5 NYLON 11MM	3384
R40-3001002 Harwin	HEX STANDOFF M4X0.7 BRASS 10MM	0
R30-9400300 Harwin	HEX SPACER M3 PLASTIC 3MM	0
R30-6701894 Harwin	ROUND SPACER M3 NYLON 18MM	1099
R30-1002002 Harwin	HEX STANDOFF M3X0.5 BRASS 20MM	4361
R40-1000802 Harwin	HEX STANDOFF M4X0.7 BRASS 8MM	2493
R30-6201014 Harwin	ROUND SPACER M3 ALUMINUM 10MM	0
R30-6200414 Harwin	ROUND SPACER M3 ALUMINUM 4MM	2831
R30-3002002 Harwin	HEX STANDOFF M3X0.5 BRASS 20MM	387
R30-3002402 Harwin	HEX STANDOFF M3X0.5 BRASS 24MM	10924
R30-1002802 Harwin	HEX STANDOFF M3X0.5 BRASS 28MM	0
R30-1000902 Harwin	HEX STANDOFF M3X0.5 BRASS 9MM	91
R40-1002002 Harwin	HEX STANDOFF M4X0.7 BRASS 20MM	1298
R30-3010802 Harwin	HEX STANDOFF M3X0.5 BRASS 8MM	716

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