Board Spacers, Standoffs

Part Number	Description / PDF	Quantity
NAS1829C4E25 RAF	STAINLESS STEEL 1/4 HEX MALE/FEM	125
NAS42DD4A-31A RAF	ALUMINUM UNTHREADED SPACER 3/16	0
4628-832-SS RAF	3/8 HEX X 3/4 LENGTH	291
2396-3716-S-12 RAF	5/8 HEX X 2.00 LENGTH	96
1184-8-N RAF	3/8 RD X 1/8 X 0.166	4880
M2147-3005-AL RAF	HEX STANDOFF M3X0.5 ALUM 12MM	1021
M1066-4007-AL RAF	6_MM_ROUND_FEMALE_STANDOFFS	837
M2159-4007-AL-7 RAF	6MM HEX X 24MM X M4 THD	175
1689-832-AL RAF	1/4 RD X 13/16 LENGTH	1000
1183-10-N RAF	5/16 RD X 2.00 X .192 ID	200
4500-632-SS RAF	HEX STANDOFF #6-32 SS 3/16"	3936
2104-440-SS RAF	HEX STANDOFF #4-40 SS 1/2"	262
4549-440-AL RAF	HEX STANDOFF #4-40 ALUM 36.53MM	1488
M2234-4007-SS RAF	10MM X 19MM X M4 THD	150
M1310-3005-B-5 RAF	6MM HEX X 13MM X M3 THD	200
M1377-5008-S-12 RAF	8MM HEX X 40MM X M5 THD	187
1533T-A-6-SS RAF	1_4-ROUND_SWAGE_SPACER	730
NAS1829C6E19 RAF	STAINLESS STEEL 3/8 HEX MALE/FEM	0
4042-632-SS RAF	1/4 RD X 1.00 LENGTH	556
4041-440-AL RAF	1_4_ROUND_MALE_FEMALE_STANDOFFS	710

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