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 (SGD) 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, BRASS
Datasheet
549In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass M10 Bulk
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
139,936On 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
9,710Expected 30/10/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.25 mm 9.53 mm 7.54 mm M5
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
10,180On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.246 in 0.375 in 0.297 in 10-24


SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
9,619Expected 11/9/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.28 mm 7.92 mm 6.35 mm M4
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
9,672Expected 13/8/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.15 mm 12.7 mm 9.52 mm M6
SI Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
9,998Expected 18/9/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 4.7 mm M4
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
8,617Expected 13/11/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.316 in 0.5 in 0.342 in 1/4-28
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
7,950Expected 30/10/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.81 mm 7.14 mm 5.33 mm M3.5
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
40,003On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 5.54 mm M3
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
17,232On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.03 mm 12.7 mm 9.53 mm M6 Bulk
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
989Expected 26/8/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.199 in 0.15 in 0.219 in 6-32
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
998Expected 26/8/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 6.43 mm 5.72 mm M5
SI Mounting Fixings ULTRASONIC INSERT, AL
Datasheet
9,349Expected 27/11/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.7 mm 6.35 mm 5.56 mm M3
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
9,993Expected 21/9/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.05 mm 3.81 mm 5.56 mm M3
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 HI-TORQUE INSERT
Datasheet
7,320Expected 29/9/2026
Min.: 1
Mult.: 1

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

Inserts Threaded Insert Aluminum 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
498Expected 25/9/2026
Min.: 1
Mult.: 1

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

Inserts Threaded Insert Brass 0.189 in 0.281 in 0.25 in 6-32
SI Mounting Fixings 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 Fixings ISA-0420 DBL ENDED NUT
Datasheet
Non-Stocked
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 Fixings ISA-256 DBL ENDED NUT ALUM
Datasheet
Non-Stocked
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 Fixings ISA-440 DBL ENDED NUT
Datasheet
Non-Stocked
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 Fixings ISA-632 DBL ENDED NUT, ALUM
Datasheet
Non-Stocked
Min.: 10,000
Mult.: 1,000

Screws & Fasteners Nut, Double Ended Aluminum 0.188 in 0.281 in 0.215 in 6-32