Board Spacers, Standoffs

Part Number	Description / PDF	Quantity
13RSSR0209 Richco, Inc. (Essentra Components)	ROUND SPACER, .380 ID, .750 OD,	1995
960450042 Würth Elektronik Midcom	ROUND PLASTIC SPACER L:45,0 MM	356
1144-6-AL RAF	1/4 RD X 1 1/2 X .140 ID	400
13RS062514 Richco, Inc. (Essentra Components)	ROUND SPACER, .160 ID, .625 OD,	500
13RS043723 Richco, Inc. (Essentra Components)	ROUND SPACER, .219 ID, .438 OD,	2000
4501T-440-SS-20 RAF	3/16 HEX X 9/32 LENGTH	880
1101-0-SS RAF	1/8 RD X 3/16 X .064 ID	1485
NC121366A Keystone Electronics Corp.	HEX STANDOFF #6-32 ALUMINUM 3"	1562
13RS037020 Richco, Inc. (Essentra Components)	ROUND SPACER, .265 ID, .370 OD,	4975
2108-632-S-12 RAF	HEX STANDOFF #6-32 STEEL 3/4"	889
1188-10-B-12 RAF	3/8 RD X 3/8 X .192 ID	300
14HTSP115 Richco, Inc. (Essentra Components)	HEX THREADED STANDOFF, #2-56 THR	996
SWI1910A Richco, Inc. (Essentra Components)	ROUND SPACER M9 NYLON 12.3MM	1744
13RS025026 Richco, Inc. (Essentra Components)	ROUND SPACER, .150 ID, .250 OD,	3000
1109-2-SS RAF	3/16 RD X 1/4 X .090 ID	398
1633T-440-N RAF	3/16_ROUND_FEMALE_STANDOFFS	663
3086-B-1032-AL-7 RAF	5/16 RD X 3/4 LENGTH	500
1532-A-4-AL RAF	1/4 RD X 3/16 X .115 ID	800
970050154 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	2946
971070244 Würth Elektronik Midcom	BRASS SPACER STUD METRIC THREAD	341

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