Board Spacers, Standoffs

Part Number	Description / PDF	Quantity
R6397-02 Harwin	HEX STANDOFF M3X0.5 BRASS 1"	1418
R30-6700994 Harwin	ROUND SPACER M3 NYLON 9MM	0
R30-3001302 Harwin	HEX STANDOFF M3X0.5 BRASS 13MM	5727
R30-6010502 Harwin	ROUND SPACER M3 BRASS 5MM	1955
R30-6700894 Harwin	ROUND SPACER M3 NYLON 8MM	7964
R30-1010702 Harwin	HEX STANDOFF M3X0.5 BRASS 7MM	1175
R40-6710394 Harwin	ROUND SPACER M4 NYLON 3MM	0
R30-6011202 Harwin	ROUND SPACER M3 BRASS 12MM	746
R30-6010302 Harwin	ROUND SPACER M3 BRASS 3MM	16450
R30-1011302 Harwin	HEX STANDOFF M3X0.5 BRASS 13MM	1467
R40-3001802 Harwin	HEX STANDOFF M4X0.7 BRASS 18MM	5169
R40-3000902 Harwin	HEX STANDOFF M4X0.7 BRASS 9MM	0
R30-3011502 Harwin	HEX STANDOFF M3X0.5 BRASS 15MM	1194
R30-9402500 Harwin	HEX SPACER M3 PLASTIC 25MM	0
R40-1001302 Harwin	HEX STANDOFF M4X0.7 BRASS 13MM	0
R30-3011002 Harwin	HEX STANDOFF M3X0.5 BRASS 10MM	1105
R30-3001602 Harwin	HEX STANDOFF M3X0.5 BRASS 16MM	2776
R30-5001102 Harwin	ROUND STANDOFF M3X0.5 BRASS 11MM	7401
R30-6012202 Harwin	ROUND SPACER M3 BRASS 22MM	595
R30-4000402 Harwin	HEX STANDOFF M3X0.5 BRASS 4MM	6621

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