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 (GBP) 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, STAINLESS
Datasheet
10,450In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.185 in 0.25 in 0.219 in 6-32
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
51,640In Stock
192On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M3


SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
24,468In Stock
26,000Expected 21/05/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
14,362In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.223 in 0.321 in 0.243 in 8-32
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
10,024In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.43 mm 9.53 mm 7.92 mm M5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
10,533In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.78 mm 5.72 mm 7.54 mm M5
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
5,600In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.316 in 0.5 in 0.342 in 1/4-20
SI Mounting Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
11,167In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 3.43 mm M3
SI Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
12,561In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.23 mm 3.18 mm M2
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
13,107In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
20,311In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 8.15 mm 7.14 mm M4
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
10,460In Stock
901On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.23 mm 3.18 mm 3.73 mm M2
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
9,478In Stock
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, BRASS
Datasheet
36,384In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
13,333In Stock
34,000On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
9,500In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 6.43 mm 9.52 mm 6.93 mm M5
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
9,970In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.23 mm 4 mm 3.73 mm M2
SI Mounting Fixings ISC-440 DBL ENDED NUT
Datasheet
557In 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
942In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.321 in 0.5 in 0.375 in 1/4-20
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
514In 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 ISB-M3 DBL ENDED
Datasheet
34,033In Stock
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
11,883In Stock
10,000Expected 27/05/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M2.5
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
2,518In Stock
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 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
798In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.03 mm 7.62 mm M6
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
45In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.267 in 0.225 in 0.297 in 10-32