Ultrasonic/Heat Staking Inserts

SI (Standard Inserts) Ultrasonic/Heat Staking Inserts are hexagonal-shaped body inserts that provide rotational torque resistance and knurling provides torque out resistance. The heat staking inserts are installed by pressing the insert into the mounting hole with a thermal press to melt the plastic surrounding the insert. The SI® brand inserts employ press-in and heat/ultrasonic installation methods to provide strong, reusable, and permanent threads in plastic. These SI® inserts are available in brass, stainless steel, and aluminum. The applications include wearables, smartphones, handheld devices, automotive, aerospace and defense, medical, transportation, industrial, and recreational equipment.

Results: 268
Select Image Part #
 Mfr.
Description Datasheet Availability Pricing (USD) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model Product
Type
Material
Mounting Hole Size
Length
Outside Diameter
Thread Size
Packaging
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
819In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.7 mm 6.35 mm 5.56 mm M3
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
628In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.127 in 0.157 in 0.147 in 2-56
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
1,159In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.158 in 0.226 in 0.179 in 4-40
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
1,730In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.223 in 0.321 in 0.243 in 8-32
SI Mounting Fixings HI-TORQUE INSERT
Datasheet
4,334In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
5,976In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.74 mm 4.7 mm 6.35 mm M4
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
1,501In Stock
2,000Expected 2026/05/29
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.05 mm 3.81 mm 5.56 mm M3
SI Mounting Fixings HI-TORQUE INSERT
Datasheet
3,652In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 3.23 mm 4 mm 3.73 mm M2
SI Mounting Fixings HI-TORQUE INSERT
Datasheet
3,462In Stock
10,000Expected 2026/07/09
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
4,705In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.23 mm 4 mm 3.73 mm M2
SI Mounting Fixings ISB-M4 DBL ENDED NUT
Datasheet
623In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Brass 5.62 mm 8.15 mm 6.22 mm M4
SI Mounting Fixings ULTRASONIC INSERT, ALUM
Datasheet
1,261In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 6.25 mm 9.53 mm 7.54 mm M5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
697In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.185 in 0.25 in 0.219 in 6-32
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
1,440In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.7 mm 6.35 mm 5.56 mm M3.5
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
2,389In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.58 mm 5.56 mm 4.37 mm M2.5
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
394In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 6.25 mm 9.53 mm 7.54 mm M5
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM .225X.247 10-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
861In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.253 in 0.225 in 10-32
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
1,006In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 3.23 mm 3.18 mm M2
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
234In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 5.67 mm 4.7 mm M4
SI Mounting Fixings HI-TORQUE INSERT, BRASS .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
2,427In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.158 in 0.135 in 4-40
SI Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
1,616In Stock
10,200On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 4.7 mm M4
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
19In Stock
10,000Expected 2026/07/07
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.03 mm 12.7 mm 8.69 mm M6
SI Mounting Fixings ULTRASONIC INSERT, ALUM
Datasheet
843In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.185 in 0.25 in 0.219 in 6-32
SI Mounting Fixings ULTRASONIC INSERT, AULM
Datasheet
1,223In Stock
2,000Expected 2026/03/12
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
479In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.118 in 0.115 in 0.141 in 2-56