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
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Description Datasheet Availability Pricing (COP) 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 Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
4.936In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.28 mm 7.92 mm 6.35 mm M4
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
12.283In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.78 mm 5.72 mm 7.54 mm M5
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
19.776In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
16.592In Stock
5.322Expected 2/18/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.223 in 0.321 in 0.243 in 8-32
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
15.845In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
13.028In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.43 mm 9.52 mm 6.93 mm M5
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
39.245In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
19.230In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.23 mm 4 mm 3.73 mm M2
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
21.231In Stock
123.000On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
28.946In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
42.469In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Hardware ISB-M3 DBL ENDED
Datasheet
34.363In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.99 mm 5.74 mm 4.62 mm M3
SI Mounting Hardware ISC-440 DBL ENDED NUT
Datasheet
774In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Stainless Steel 0.157 in 0.226 in 0.182 in 4-40
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
967In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.321 in 0.5 in 0.375 in 1/4-20
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
949In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.86 mm 7.62 mm 9.52 mm M6
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
1.319In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.349 in 0.3 in 0.375 in 1/4-20
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
1.219In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.185 in 0.25 in 0.219 in 6-32
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
1.425In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.208 in 0.312 in 0.25 in 8-32
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
757In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.158 in 0.226 in 0.179 in 4-40
SI Mounting Hardware ISB-M5 DBL ENDED NUT
Datasheet
1.130In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Brass 6.4 mm 9.52 mm 7.01 mm M5
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
901In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.349 in 0.3 in 0.375 in 1/4-20
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
2.861In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.226 in 0.185 in 0.25 in 8-32
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
6.360In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
3.075In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.74 mm 4.7 mm 6.35 mm M4
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
866In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.15 mm 12.7 mm 9.52 mm M6