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 (CRC) 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
Datasheet
10 242In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.189 in 0.281 in 0.21 in 6-32
SI Mounting Hardware ISA-032 DBL ENDED NUT
Datasheet
986In Stock
Min.: 1
Mult.: 1

Screws & Fasteners Nut, Double Ended Aluminum 0.252 in 0.375 in 0.276 in 10-32
SI Mounting Hardware ISB-M3 DBL ENDED
Datasheet
14In Stock
10 000Expected 11/27/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.99 mm 5.74 mm 4.62 mm M3
SI Mounting Hardware 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 Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
2 102In Stock
10 000Expected 11/2/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
645In Stock
10 000Expected 10/23/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.74 mm 4.7 mm 6.35 mm M4
SI Mounting Hardware 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 Hardware HI-TORQUE INSERT
Datasheet
327In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Hardware 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 Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
192In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.127 in 0.157 in 0.147 in 2-56
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
525In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.5 in 0.375 in 1/4-20
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
9 088In Stock
28 000Expected 11/20/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M2.5
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
84In Stock
10 000Expected 8/24/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.7 mm 6.35 mm 5.56 mm M3
SI Mounting Hardware 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 Hardware 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 Hardware HI-TORQUE INSERT, BRASS
Datasheet
6 905In Stock
10 000Expected 11/27/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Hardware HI-TORQUE INSERT, BRASS 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
698In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.03 mm 7.62 mm M6
SI Mounting Hardware HI-TORQUE INSERT, BRASS 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
3 016In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 9.6 mm 12.7 mm 10.31 mm M8
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
793In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 6.78 mm 5.72 mm 7.54 mm M5
SI Mounting Hardware HI-TORQUE INSERT
Datasheet
4 310In Stock
27 000On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Hardware HI-TORQUE INSERT, ALUMINUM 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
584In Stock
10 000Expected 10/30/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 4.01 mm 3.43 mm M3
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
252In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.127 in 0.157 in 0.147 in 2-56
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
151In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.223 in 0.321 in 0.243 in 8-32
SI Mounting Hardware 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 Hardware 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