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 (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 Fixings ISB-M3 DBL ENDED
Datasheet
14In Stock
10,000Expected 27/11/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.99 mm 5.74 mm 4.62 mm M3
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
679In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.246 in 0.375 in 0.297 in 10-24
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
2,198In Stock
10,000Expected 25/01/2027
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.28 mm 7.92 mm 6.35 mm M4
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
2,072In Stock
10,000Expected 02/10/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
1,915In 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
277In Stock
10,000On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
479In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 8.03 mm 7.62 mm M6
SI Mounting Fixings HI-TORQUE INSERT, BRASS .225X.247 10-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
381In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.253 in 0.225 in 10-32
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
505In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.5 in 0.375 in 1/4-20
SI Mounting Fixings ULTRASONIC INSERT, ALUM
Datasheet
331In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 6.78 mm 5.72 mm 7.54 mm M5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
1,080In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.246 in 0.375 in 0.297 in 10-32
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
594In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.7 mm 6.35 mm 5.56 mm M3
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
253In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.127 in 0.157 in 0.147 in 2-56
SI Mounting Fixings HI-TORQUE INSERT, ALUM
Datasheet
659In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.158 in 0.226 in 0.179 in 4-40
SI Mounting Fixings HI-TORQUE INSERT, ALUMINUM .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
946In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.158 in 0.135 in 4-40
SI Mounting Fixings ISB-M4 DBL ENDED NUT
Datasheet
363In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Brass 5.62 mm 8.15 mm 6.22 mm M4
SI Mounting Fixings ULTRASONIC INSERT, ALUM
Datasheet
1,121In 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
1,230In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.7 mm 6.35 mm 5.56 mm M3.5
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
525In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.246 in 0.375 in 0.297 in 10-32
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
489In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.226 in 0.185 in 0.25 in 8-32
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
1,249In 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, BRASS
Datasheet
8,661In Stock
28,000Expected 20/11/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M2.5
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
98In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.321 in 0.5 in 0.375 in 1/4-20
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
798In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.107 in 0.188 in 0.141 in 2-56
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
353In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.5 in 0.342 in 1/4-20