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 (IDR) 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 HI-TORQUE INSERT, ALUMINUM .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
959In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.158 in 0.135 in 4-40
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
1.955In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.189 in 0.281 in 0.21 in 6-32
SI Mounting Fixings HI-TORQUE INSERT
Datasheet
1.881In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.81 mm 7.14 mm 5.33 mm M3.5
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
397In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 6.43 mm 5.72 mm M5
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
988In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 9.6 mm 12.7 mm 10.31 mm M8
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
824In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.253 in 0.375 in 0.273 in 10-24
SI Mounting Fixings HI-TORQUE INSERT, BRASS .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
16In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.3 in 0.342 in 1/4-20
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
254In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.5 in 0.342 in 1/4-28
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
333In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.468 in 0.5 in 0.509 in 3/8-16
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
1.573In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.253 in 0.375 in 0.273 in 10-24
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
915In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.316 in 0.3 in 0.342 in 1/4-20
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .185X.217 8-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
940In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.223 in 0.185 in 0.243 in 8-32
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
880In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.253 in 0.375 in 0.312 in 10-32
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
898In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.127 in 0.157 in 0.187 in 2-56
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
114In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.223 in 0.321 in 0.281 in 8-32 Bulk
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
585In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass M10 Bulk
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
16.993On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
11.788On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.58 mm 5.56 mm 4.37 mm M2.5
SI Mounting Fixings HI-TORQUE INSERT
Datasheet
14.962On Order
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
11.452On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 6.43 mm 9.52 mm 6.93 mm M5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
11.823Expected 12/06/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M2.5
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM .125X.121 2-56 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
4In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.127 in 0.125 in 2-56
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
4.990Expected 10/04/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.153 in 0.135 in 0.172 in 4-40
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
10.780On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.28 mm 7.92 mm 6.35 mm M4
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
4.023On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.81 mm 7.14 mm 5.33 mm M3.5