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 HI-TORQUE INSERT, STAINLESS
Datasheet
14,735In 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
21,874In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.223 in 0.321 in 0.243 in 8-32
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
16,093In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
4,922In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 5.28 mm 7.92 mm 6.35 mm M4
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
11,933In 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, BRASS
Datasheet
12,828In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 6.43 mm 9.52 mm 6.93 mm M5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
21,131In Stock
123,000On Order
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.58 mm 5.56 mm 4.37 mm M3
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
18,846In Stock
24,000On 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, BRASS
Datasheet
38,061In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M3
SI Mounting Fixings ISB-M3 DBL ENDED
Datasheet
34,333In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.99 mm 5.74 mm 4.62 mm M3
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
41,765In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
1,000In Stock
15Expected 18/05/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.118 in 0.115 in 0.141 in 2-56
SI Mounting Fixings 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 Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
4,390In Stock
10,000Expected 14/04/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.23 mm 3.18 mm M2
SI Mounting Fixings HI-TORQUE INSERT, STAINLESS
Datasheet
1,786In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 4.01 mm 5.74 mm 4.55 mm M2.5
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
620In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 7.06 mm 11.1 mm 8.33 mm M5
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
1,496In Stock
2,000Expected 20/03/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 5.67 mm 8.15 mm 6.17 mm M4
SI Mounting Fixings HI-TORQUE INSERT, BRASS 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL
Datasheet
898In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 8.03 mm 7.62 mm M6
SI Mounting Fixings ULTRASONIC INSERT, ALUM
Datasheet
2,577In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Aluminum 0.153 in 0.135 in 0.172 in 4-40
SI Mounting Fixings ULTRASONIC INSERT, BRASS
Datasheet
16,826In Stock
11,000Expected 13/04/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 3.89 mm 3.43 mm 4.37 mm M3
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
857In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.246 in 0.375 in 0.297 in 10-32
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
498In Stock
10,000Expected 15/04/2026
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 0.153 in 0.135 in 0.172 in 4-40
SI Mounting Fixings TAPERED THRU THREADED INSERT M2X0.4 STAINLESS STEEL
Datasheet
4,851In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3 mm 2.92 mm M2
SI Mounting Fixings ULTRASONIC INSERT, STAINLESS
Datasheet
1,472In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Stainless Steel 3.89 mm 3.43 mm 4.37 mm M2.5
SI Mounting Fixings HI-TORQUE INSERT, BRASS
Datasheet
1,143In Stock
Min.: 1
Mult.: 1

Inserts Threaded Insert Brass 0.253 in 0.375 in 0.273 in 10-32