Board Spacers, Standoffs

Part Number	Description / PDF	Quantity
9774025151R Würth Elektronik Midcom	RND STNDFF M2.5X0.45 STEEL 2.5MM	18591
970200321 Würth Elektronik Midcom	HEX SPACER M3X0.5 STEEL 20MM	1592
9774070360R Würth Elektronik Midcom	ROUND STANDOFF M3X0.5 STEEL 7MM	415
970370361 Würth Elektronik Midcom	HEX SPACER M3X0.5 STEEL 37MM	129
971080474 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	1089
970100324 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	1016
960450042 Würth Elektronik Midcom	ROUND PLASTIC SPACER L:45,0 MM	356
970050154 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	2946
971070244 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	341
9775116360R Würth Elektronik Midcom	ROUND STANDOFF M3 STEEL 1MM	483
970170581 Würth Elektronik Midcom	HEX SPACER M5 STEEL 17MM	0
963020174 Würth Elektronik Midcom	ROUND BRASS SPACER L:2,0 MM;ID:4	4852
971110385 Würth Elektronik Midcom	PLASTIC SPACER STUD METRIC THREA	500
970160154 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	282
963050174 Würth Elektronik Midcom	ROUND BRASS SPACER L:5,0 MM;ID:4	367
960090084 Würth Elektronik Midcom	ROUND PLASTIC SPACER L:9,0 MM	420
970090155 Würth Elektronik Midcom	PLASTIC SPACER STUD METRIC THREA	640
971200155 Würth Elektronik Midcom	PLASTIC SPACER STUD METRIC THREA	278
970100511 Würth Elektronik Midcom	HEX SPACER M5 STEEL 10MM	0
960110010 Würth Elektronik Midcom	ROUND PLASTIC SPACER L:11,0 MM	1977

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