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.

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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 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
1,697In 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, 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
254In 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 7/7/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.03 mm 12.7 mm 8.69 mm M6
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
8,617In Stock
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
1,654In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.468 in 0.5 in 0.509 in 3/8-16
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
5,665In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.03 mm 7.62 mm 8.69 mm M6
SI Mounting Fixings 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 Fixings ULTRASONIC INSERT, BRASS
Datasheet
1,035In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.15 mm 12.7 mm 9.52 mm M6
SI Mounting Fixings 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 Fixings ISC-0420 DBL ENDED NUT
Datasheet
13,412In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Stainless Steel 0.315 in 0.5 in 0.338 in 1/4-20
SI Mounting Fixings ISC-632 DBL ENDED NUT
Datasheet
62In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Stainless Steel 0.188 in 0.281 in 0.215 in 6-32
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
332In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.25 mm 9.53 mm 7.54 mm M5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
675In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 10.19 mm 14.27 mm 11.91 mm M8
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
980In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.107 in 0.188 in 0.141 in 0-80
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
469In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.86 mm 7.62 mm 9.52 mm M6
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
730In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.5 in 0.375 in 1/4-20
SI Mounting Fixings 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 Fixings ULTRASONIC INSERT, AL
Datasheet
835In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.7 mm 6.35 mm 5.56 mm M3