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 Hardware HI-TORQUE INSERT, ALUMINUM .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
615In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.316 in 0.3 in 0.342 in 1/4-20
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS
Datasheet
2,700In Stock
5,250Expected 10/30/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.81 mm 7.14 mm 5.33 mm M3.5
SI Mounting Hardware HI-TORQUE INSERT, BRASS
Datasheet
341In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.81 mm 7.14 mm 6.35 mm M3.5 Bulk
SI Mounting Hardware ULTRASONIC INSERT, AULM
Datasheet
486In Stock
10,000Expected 11/13/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
1,302In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.199 in 0.15 in 0.219 in 6-32
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
380In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.267 in 0.225 in 0.297 in 10-24
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
5,924In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.118 in 0.115 in 0.141 in 2-56
SI Mounting Hardware HI-TORQUE INSERT, STAINLESS STEEL .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
380In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.189 in 0.15 in 0.21 in 6-32
SI Mounting Hardware ULTRASONIC INSERT, ALUM
Datasheet
381In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 6.78 mm 5.72 mm 7.54 mm M5
SI Mounting Hardware 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 Hardware 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 Hardware 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 Hardware 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 Hardware 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 Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
954In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.267 in 0.225 in 0.297 in 10-32
SI Mounting Hardware ULTRASONIC INSERT, STAINLESS
Datasheet
763In 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
364In 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
131In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.223 in 0.321 in 0.243 in 8-32
SI Mounting Hardware ULTRASONIC INSERT, BRASS
Datasheet
9,061In 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, STAINLESS
Datasheet
180In Stock
10,000Expected 9/7/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.246 in 0.375 in 0.297 in 10-24
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 .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
14In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.316 in 0.3 in 0.342 in 1/4-20