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, STAINLESS IUC-632-2 SI 1: 0,568 € 8 408In 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	8 408In 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 € 63 005In 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	63 005In 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-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 756In 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 756In 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 HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: 0,912 € 8 335In Stock	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	8 335In Stock	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 ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: 0,189 € 33 198In Stock	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	33 198In Stock	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-832 SI 1: 0,318 € 13 267In 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 267In 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, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: 0,353 € 15 214In 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	15 214In 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 IUTB-M6 SI 1: 0,697 € 7 358In Stock	Mfr. Part No. IUTB-M6 Mouser Part No 153-IUTB-M6	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7 358In Stock	0,697 € 0,495 € 0,396 € 0,373 € View 0,316 € 0,303 € 0,297 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.03 mm	12.7 mm	8.69 mm	M6
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-632 SI 1: 0,679 € 8 305In 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 305In 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 IUTC-M2.5 SI 1: 0,74 € 10 955In 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 955In 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, STAINLESS IUC-M2.5-1 SI 1: 0,602 € 10 444In 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 444In 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, STAINLESS IUTC-M6 SI 1: 1,14 € 9 133In 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 133In 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 769In 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 769In 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 ULTRASONIC,INSERT,STAINLESS IUCC-M5-2 SI 1: 0,86 € 9 496In Stock	Mfr. Part No. IUCC-M5-2 Mouser Part No 153-IUCC-M5-2	SI	Mounting Fixings ULTRASONIC,INSERT,STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9 496In Stock	0,86 € 0,639 € 0,498 € 0,469 € View 0,458 € 0,443 € 0,427 € 0,412 € 0,406 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	7.06 mm	11.1 mm	8.33 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: 0,464 € 10 451In 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	10 451In 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 ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: 0,447 € 15 572In Stock 98 141On 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	15 572In Stock 98 141On Order On Order Ship Dates Mfr. No: IUC-M3-2 Stock: 15 572 Can Dispatch Immediately On Order: 36 141 Pending 62 000 Expected 20/11/2026 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 IUTB-M5 SI 1: 0,447 € 8 118In Stock	Mfr. Part No. IUTB-M5 Mouser Part No 153-IUTB-M5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8 118In Stock	0,447 € 0,314 € 0,252 € 0,237 € View 0,20 € 0,192 € 0,188 € 0,181 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: 0,516 € 9 211In Stock 31 000On Order	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	9 211In Stock 31 000On Order On Order Ship Dates Mfr. No: IUTFB-M4 Stock: 9 211 Can Dispatch Immediately On Order: 20 000 Expected 12/10/2026 11 000 Expected 04/01/2027 Factory Lead Time: 24 Weeks	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 HI-TORQUE INSERT, BRASS IUTB-M2 SI 1: 0,396 € 16 227In Stock	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	16 227In Stock	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 ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: 0,224 € 146 425In Stock 87 041On 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	146 425In Stock 87 041On Order On Order Ship Dates Mfr. No: IUB-M3-2 Stock: 146 425 Can Dispatch Immediately On Order: 12 674 Pending 74 367 Expected 20/10/2026 Factory Lead Time: 18 Weeks	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 HI-TORQUE INSERT, BRASS IUTFB-M2.5 SI 1: 0,482 € 7 616In Stock	Mfr. Part No. IUTFB-M2.5 Mouser Part No 153-IUTFB-M2.5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7 616In Stock	0,482 € 0,347 € 0,277 € 0,249 € View 0,231 € 0,225 € 0,212 € 0,208 € 0,20 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M2.5	Bulk
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3 SI 1: 0,378 € 19 795In Stock 19 000Expected 02/10/2026	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	19 795In Stock 19 000Expected 02/10/2026	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 IUTA-M3 SI 1: 0,275 € 14 310In Stock 17 000Expected 21/12/2026	Mfr. Part No. IUTA-M3 Mouser Part No 153-IUTA-M3	SI	Mounting Fixings HI-TORQUE INSERT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14 310In Stock 17 000Expected 21/12/2026	0,275 € 0,198 € 0,158 € 0,143 € View 0,132 € 0,129 € 0,121 € 0,119 € 0,114 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M3 SI 1: 0,731 € 39 067In Stock	Mfr. Part No. IUTC-M3 Mouser Part No 153-IUTC-M3	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	39 067In Stock	0,731 € 0,521 € 0,417 € 0,376 € View 0,348 € 0,339 € 0,32 € 0,313 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M3