Mounting Fixings – Mouser Finland

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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.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (EUR) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Type	Material	Mounting Hole Size	Length	Outside Diameter	Thread Size	Packaging
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: 0,224 € 187 278In Stock 12 674On Order	Mfr. Part No. IUB-M3-2 Mouser Part No 153-IUB-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	187 278In Stock 12 674On Order	0,224 € 0,153 € 0,123 € 0,115 € View 0,097 € 0,094 € 0,091 € 0,089 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: 0,447 € 92 438In Stock 16 125On Order	Mfr. Part No. IUC-M3-2 Mouser Part No 153-IUC-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	92 438In Stock 16 125On Order On Order Ship Dates Mfr. No: IUC-M3-2 Stock: 92 438 Can Dispatch Immediately On Order: 6 141 Pending 9 984 Expected 10/11/2026 Factory Lead Time: 19 Weeks	0,447 € 0,319 € 0,255 € 0,23 € View 0,213 € 0,207 € 0,195 € 0,191 € 0,185 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: 0,353 € 14 444In Stock	Mfr. Part No. IUTB-M3-343 Mouser Part No 153-IUTB-M3-343	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14 444In Stock	0,353 € 0,25 € 0,20 € 0,18 € View 0,167 € 0,163 € 0,153 € 0,15 € 0,144 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: 0,404 € 9 561In Stock	Mfr. Part No. IUTB-M2-318 Mouser Part No 153-IUTB-M2-318	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9 561In Stock	0,404 € 0,286 € 0,23 € 0,206 € View 0,187 € 0,186 € 0,175 € 0,171 € 0,165 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.18 mm		M2
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: 1,04 € 3 764In Stock	Mfr. Part No. IUTC-0420 Mouser Part No 153-IUTC-0420	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3 764In Stock	1,04 € 0,772 € 0,608 € 0,516 € View 0,498 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.316 in	0.5 in	0.342 in	1/4-20
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M3-343 SI 1: 0,697 € 8 486In Stock	Mfr. Part No. IUTC-M3-343 Mouser Part No 153-IUTC-M3-343	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8 486In Stock	0,697 € 0,495 € 0,396 € 0,373 € View 0,316 € 0,303 € 0,297 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	3.43 mm	4.55 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-632-2 SI 1: 0,568 € 6 783In Stock	Mfr. Part No. IUC-632-2 Mouser Part No 153-IUC-632-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6 783In Stock	0,568 € 0,399 € 0,32 € 0,288 € View 0,267 € 0,26 € 0,244 € 0,239 € 0,231 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.185 in	0.25 in	0.219 in	6-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M3 SI 1: 0,318 € 59 979In Stock	Mfr. Part No. IUTB-M3 Mouser Part No 153-IUTB-M3	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	59 979In Stock	0,318 € 0,226 € 0,181 € 0,163 € View 0,151 € 0,147 € 0,138 € 0,136 € 0,131 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-632 SI 1: 0,679 € 8 105In Stock	Mfr. Part No. IUTC-632 Mouser Part No 153-IUTC-632	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8 105In Stock	0,679 € 0,477 € 0,383 € 0,36 € View 0,305 € 0,292 € 0,286 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.189 in	0.281 in	0.21 in	6-32
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: 0,464 € 9 923In Stock	Mfr. Part No. IUTC-M2-318 Mouser Part No 153-IUTC-M2-318	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9 923In Stock	0,464 € 0,328 € 0,262 € 0,236 € View 0,218 € 0,212 € 0,20 € 0,196 € 0,189 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	3.18 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M5-572 SI 1: 0,482 € 10 311In Stock	Mfr. Part No. IUTB-M5-572 Mouser Part No 153-IUTB-M5-572	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10 311In Stock	0,482 € 0,341 € 0,273 € 0,246 € View 0,229 € 0,222 € 0,21 € 0,205 € 0,198 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	5.72 mm		M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M2.5 SI 1: 0,74 € 10 312In Stock	Mfr. Part No. IUTC-M2.5 Mouser Part No 153-IUTC-M2.5	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10 312In Stock	0,74 € 0,525 € 0,421 € 0,378 € View 0,351 € 0,341 € 0,322 € 0,314 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: 0,55 € 9 560In Stock	Mfr. Part No. IUB-M5-2 Mouser Part No 153-IUB-M5-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9 560In Stock	0,55 € 0,39 € 0,312 € 0,281 € View 0,261 € 0,253 € 0,238 € 0,233 € 0,225 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: 0,602 € 10 229In Stock	Mfr. Part No. IUC-M2.5-1 Mouser Part No 153-IUC-M2.5-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10 229In Stock	0,602 € 0,423 € 0,339 € 0,305 € View 0,283 € 0,275 € 0,259 € 0,254 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.89 mm	3.43 mm	4.37 mm	M2.5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-832 SI 1: 0,318 € 13 080In Stock	Mfr. Part No. IUTB-832 Mouser Part No 153-IUTB-832	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	13 080In Stock	0,318 € 0,224 € 0,179 € 0,169 € View 0,143 € 0,137 € 0,133 € 0,129 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.223 in	0.321 in	0.243 in	8-32
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M6 SI 1: 1,14 € 9 053In Stock	Mfr. Part No. IUTC-M6 Mouser Part No 153-IUTC-M6	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9 053In Stock	1,14 € 0,841 € 0,655 € 0,617 € View 0,603 € 0,583 € 0,563 € 0,543 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.03 mm	12.7 mm	8.69 mm	M6
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M5 SI 1: 0,808 € 9 727In Stock	Mfr. Part No. IUTFB-M5 Mouser Part No 153-IUTFB-M5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9 727In Stock	0,808 € 0,569 € 0,456 € 0,411 € View 0,381 € 0,37 € 0,349 € 0,341 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3 SI 1: 0,378 € 20 327In Stock 16 000Expected 24/02/2027	Mfr. Part No. IUTFB-M3 Mouser Part No 153-IUTFB-M3	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	20 327In Stock 16 000Expected 24/02/2027	0,378 € 0,269 € 0,215 € 0,203 € View 0,172 € 0,164 € 0,161 € 0,156 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M4 SI 1: 0,439 € 12 138In Stock	Mfr. Part No. IUTB-M4 Mouser Part No 153-IUTB-M4	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	12 138In Stock	0,439 € 0,312 € 0,249 € 0,224 € View 0,209 € 0,203 € 0,191 € 0,187 € 0,181 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-440-2 SI 1: 0,456 € 8 745In Stock	Mfr. Part No. IUC-440-2 Mouser Part No 153-IUC-440-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8 745In Stock	0,456 € 0,321 € 0,256 € 0,242 € View 0,205 € 0,196 € 0,192 € 0,185 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.141 in	0.219 in	0.172 in	4-40
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: 0,912 € 4 695In Stock 10 000Expected 05/03/2027	Mfr. Part No. IUTC-M4 Mouser Part No 153-IUTC-M4	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	4 695In Stock 10 000Expected 05/03/2027	0,912 € 0,682 € 0,531 € 0,501 € View 0,489 € 0,473 € 0,457 € 0,44 € 0,434 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: 0,516 € 26 933In Stock 11 000Expected 10/11/2026	Mfr. Part No. IUTFB-M4 Mouser Part No 153-IUTFB-M4	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	26 933In Stock 11 000Expected 10/11/2026	0,516 € 0,369 € 0,295 € 0,266 € View 0,247 € 0,24 € 0,226 € 0,221 € 0,213 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	7.14 mm	M4
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: 0,189 € 20 594In Stock 52 000On Order	Mfr. Part No. IUB-M3-1 Mouser Part No 153-IUB-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	20 594In Stock 52 000On Order On Order Ship Dates Mfr. No: IUB-M3-1 Stock: 20 594 Can Dispatch Immediately On Order: 25 000 Expected 12/02/2027 27 000 Expected 12/03/2027 Factory Lead Time: 17 Weeks	0,189 € 0,137 € 0,109 € 0,099 € View 0,091 € 0,089 € 0,084 € 0,082 € 0,079 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M2 SI 1: 0,396 € 14 536In Stock 10 000Expected 12/04/2027	Mfr. Part No. IUTB-M2 Mouser Part No 153-IUTB-M2	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14 536In Stock 10 000Expected 12/04/2027	0,396 € 0,286 € 0,229 € 0,206 € View 0,191 € 0,186 € 0,175 € 0,171 € 0,165 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M6 SI 1: 0,679 € 5 503In Stock 16 427On Order	Mfr. Part No. IUTFB-M6 Mouser Part No 153-IUTFB-M6	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	5 503In Stock 16 427On Order On Order Ship Dates Mfr. No: IUTFB-M6 Stock: 5 503 Can Dispatch Immediately On Order: 4 927 Pending 11 500 Expected 12/02/2027 Factory Lead Time: 19 Weeks	0,679 € 0,506 € 0,416 € 0,353 € View 0,35 € 0,338 € 0,326 € 0,321 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.03 mm	12.7 mm	9.53 mm	M6	Bulk