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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 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 Hardware HI-TORQUE INSERT, BRASS
Datasheet
760In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.253 in 0.375 in 0.312 in 10-32
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
89In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.223 in 0.321 in 0.281 in 8-32 Bulk
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
549In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass M10 Bulk
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
9,710Expected 9/3/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.25 mm 9.53 mm 7.54 mm M5
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
9,015Expected 11/24/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 7.06 mm 11.1 mm 8.33 mm M5
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
9,795Expected 11/6/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.141 in 0.219 in 0.172 in 4-40


SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
9,419Expected 9/11/2026
A tariff of 40% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.28 mm 7.92 mm 6.35 mm M4
SI Mounting Hardware HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
9,998Expected 9/18/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 4.7 mm M4
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
8,617Expected 11/13/2026
A tariff of 38% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.316 in 0.5 in 0.342 in 1/4-28
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
39,503On Order
A tariff of 45% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 5.54 mm M3
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
17,132On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.03 mm 12.7 mm 9.53 mm M6 Bulk
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
9,994Expected 9/18/2026
A tariff of 45% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.153 in 0.135 in 0.172 in 4-40
SI Mounting Hardware ULTRASONIC INSERT, AL
Datasheet
9,349Expected 11/27/2026
A tariff of 38% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.7 mm 6.35 mm 5.56 mm M3
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
9,993Expected 9/21/2026
A tariff of 45% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.05 mm 3.81 mm 5.56 mm M3
SI Mounting Hardware 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 Hardware HI-TORQUE INSERT
Datasheet
7,320Expected 9/29/2026
A tariff of 38% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 3.23 mm 4 mm 3.73 mm M2
SI Mounting Hardware HI-TORQUE INSERT
Datasheet
8,509Expected 10/12/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
498Expected 9/25/2026
A tariff of 38% may be applied if shipping to the United States.
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.81 mm 7.14 mm 5.33 mm M3.5
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
1,997Expected 10/30/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.189 in 0.281 in 0.25 in 6-32
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
Non-Stocked Lead-Time 10 Weeks
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.141 in 0.219 in 0.172 in 4-40
SI Mounting Hardware ISA-0420 DBL ENDED NUT
Datasheet
Non-Stocked
A tariff of 38% may be applied if shipping to the United States.
Min.: 10,000
Mult.: 1,000

Screws & Fasteners Nut, Double Ended Aluminum 0.315 in 0.5 in 0.338 in 1/4-20
SI Mounting Hardware ISA-256 DBL ENDED NUT ALUM
Datasheet
Non-Stocked
A tariff of 38% may be applied if shipping to the United States.
Min.: 10,000
Mult.: 1,000

Screws & Fasteners Nut, Double Ended Aluminum 0.126 in 0.157 in 0.151 in 2-56
SI Mounting Hardware ISA-440 DBL ENDED NUT
Datasheet
Non-Stocked
A tariff of 38% may be applied if shipping to the United States.
Min.: 10,000
Mult.: 1,000

Screws & Fasteners Nut, Double Ended Aluminum 0.157 in 0.226 in 0.182 in 4-40
SI Mounting Hardware ISA-632 DBL ENDED NUT, ALUM
Datasheet
Non-Stocked
A tariff of 38% may be applied if shipping to the United States.
Min.: 10,000
Mult.: 1,000

Screws & Fasteners Nut, Double Ended Aluminum 0.188 in 0.281 in 0.215 in 6-32
SI Mounting Hardware ISA-832 DBL ENDED NUT
Datasheet
Non-Stocked
A tariff of 38% may be applied if shipping to the United States.
Min.: 10,000
Mult.: 1,000

Screws & Fasteners Nut, Double Ended Aluminum 0.221 in 0.321 in 0.245 in 8-32