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 (CAD) 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 Hardware HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
12,256In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.23 mm 3.18 mm M2
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
12,700In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
14,291In Stock
11,000Expected 2026-09-21
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 8.15 mm 7.14 mm M4
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
5,500In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.316 in 0.5 in 0.342 in 1/4-20
SI Mounting Hardware HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
10,777In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 3.43 mm M3


SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
46,298In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Hardware 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 Hardware 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 Hardware HI-TORQUE INSERT, BRASS
Datasheet
30,485In Stock
53,000Expected 2026-06-26
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
10,005In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.189 in 0.281 in 0.21 in 6-32
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
11,181In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.23 mm 3.18 mm 3.73 mm M2
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
11,531In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
9,363In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 8.03 mm 12.7 mm 8.69 mm M6

SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
11,268In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.43 mm 9.52 mm 6.93 mm M5
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
11,170In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.01 mm 3.43 mm 4.55 mm M3
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
13,860In 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 Hardware HI-TORQUE INSERT, BRASS
Datasheet
17,855In Stock
4,798Expected 2026-06-25
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.23 mm 4 mm 3.73 mm M2
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
35,907In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
19,268In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M2.5
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS STEEL 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
2,947In Stock
7,124Expected 2026-06-08
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 9.6 mm 12.7 mm 10.31 mm M8
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
10,670In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.23 mm 4 mm 3.73 mm M2
SI Mounting Hardware HI-TORQUE INSERT, BRASS .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
1,481In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.189 in 0.15 in 6-32
SI Mounting Hardware 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 Hardware 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 Hardware ULTRASONIC INSERT, BRASS
Datasheet
755In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.349 in 0.3 in 0.375 in 1/4-20