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, BRASS
Datasheet
324In Stock
10,000Expected 17/7/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.7 mm 6.35 mm 5.56 mm M3
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
520In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 7.06 mm 11.1 mm 8.33 mm M5
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
1,514In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.107 in 0.188 in 0.141 in 2-56
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
433In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.86 mm 7.62 mm 9.52 mm M6
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
12In Stock
12,000On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.05 mm 3.81 mm 5.56 mm M3
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
SI Mounting Fixings HI-TORQUE INSERT, BRASS 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
3,466In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 9.6 mm 12.7 mm 10.31 mm M8
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
501In Stock
10,000Expected 8/6/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 9.6 mm 12.7 mm 10.31 mm M8
SI Mounting Fixings ISB-M4 DBL ENDED NUT
Datasheet
523In 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
1,261In 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
597In Stock
10,000Expected 31/7/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.185 in 0.25 in 0.219 in 6-32
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
1,330In 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
819In 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
2,339In 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
374In 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
976In 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
232In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 5.67 mm 4.7 mm M4
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
6,833In Stock
17,000Expected 12/6/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.23 mm 4 mm 3.73 mm M2
SI Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
1,354In Stock
10,200On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 4.7 mm M4
SI Mounting Fixings ULTRASONIC INSERT, ALUM
Datasheet
843In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.185 in 0.25 in 0.219 in 6-32
SI Mounting Fixings ULTRASONIC INSERT, AULM
Datasheet
2,489In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
132In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.25 mm 9.53 mm 7.54 mm M5
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
1,375In Stock
10,000Expected 3/7/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 5.54 mm M2.5 Bulk
SI Mounting Fixings ISC-M4 DBL ENDED NUT
Datasheet
535In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Stainless Steel 5.62 mm 8.15 mm 6.22 mm M4