Board Spacers, Standoffs

Part Number	Description / PDF	Quantity
4982 Keystone Electronics Corp.	HEX STANDOFF #8-32 NYLON 1/2"	14834300
24331 Keystone Electronics Corp.	HEX STANDOFF M2.5X0.45 ALUM 10MM	0
8441F Keystone Electronics Corp.	HEX STANDOFF #6-32 NYLON 7/8"	1150600
7673 Keystone Electronics Corp.	RND STNDFF #8-32 CERAMIC 1-1/2"	109168
24349 Keystone Electronics Corp.	HEX STANDOFF M4 ALUMINUM 10MM	0
1792-2 Keystone Electronics Corp.	ROUND STANDOFF #4-40 BRASS 7/8"	747600
24492 Keystone Electronics Corp.	HEX STANDOFF M4 SS 8MM	27557
1548D Keystone Electronics Corp.	ROUND STANDOFF #6-32 BRASS 5/8"	135700
24465 Keystone Electronics Corp.	HEX STANDOFF M2.5X0.45 SS 15MM	1227
7720 Keystone Electronics Corp.	RND STANDOFF 1/4"-20 CERAMIC 4"	25079
1561B Keystone Electronics Corp.	ROUND STANDOFF #6-32 BRASS 3/8"	2147483647
357 Keystone Electronics Corp.	ROUND STANDOFF #4-40 BRASS 1/2"	116474
1474B Keystone Electronics Corp.	HEX STANDOFF #8-32 BRASS 3/8"	3741200
4939 Keystone Electronics Corp.	4-40 SMT THREADED INSERT	583
24330 Keystone Electronics Corp.	HEX STANDOFF M4 BRASS 25MM	476200
4986 Keystone Electronics Corp.	HEX STANDOFF #8-32 NYLON 1"	13382000
2315A Keystone Electronics Corp.	ROUND STANDOFF #8-32 ALUM 3/8"	273800
25535 Keystone Electronics Corp.	HEX STANDOFF M4 NYLON 25MM	30032700
1922D Keystone Electronics Corp.	HEX STANDOFF #6-32 SS 1"	48601394
24353 Keystone Electronics Corp.	HEX STANDOFF M4 ALUMINUM 20MM	28022

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