Mounting Fixings – Mouser Bulgaria

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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 € 190.792In 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	190.792In Stock 12.674On Order On Order Ship Dates Mfr. No: IUB-M3-2 Stock: 190.792 Can Dispatch Immediately On Order: 8.041 Pending 4.633 Expected 10/16/2026 Factory Lead Time: 20 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 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: 0,404 € 11.575In 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	11.575In Stock	0,404 € 0,286 € 0,23 € 0,216 € View 0,183 € 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-M2.5 SI 1: 0,74 € 10.935In 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	10.935In 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: 0,507 € 9.710In 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	9.710In Stock	0,507 € 0,358 € 0,286 € 0,27 € View 0,229 € 0,218 € 0,214 € 0,207 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 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-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 IUC-632-2 SI 1: 0,568 € 7.383In 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	7.383In 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 € 62.715In 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	62.715In 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, 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, 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 € 7.235In 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	7.235In 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 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 ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: 0,189 € 27.188In Stock 25.000Expected 11/20/2026	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	27.188In Stock 25.000Expected 11/20/2026	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 € 13.261In 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	13.261In 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 ULTRASONIC INSERT, BRASS IUB-M2.5-2 SI 1: 0,404 € 9.486In Stock	Mfr. Part No. IUB-M2.5-2 Mouser Part No 153-IUB-M2.5-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.486In Stock	0,404 € 0,283 € 0,227 € 0,213 € View 0,181 € 0,173 € 0,169 € 0,163 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-440 SI 1: 0,413 € 9.989In Stock	Mfr. Part No. IUTFB-440 Mouser Part No 153-IUTFB-440	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.989In Stock	0,413 € 0,29 € 0,232 € 0,209 € View 0,188 € 0,177 € 0,174 € 0,168 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.226 in	0.218 in	4-40	Bulk
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-024-2 SI 1: 0,748 € 9.048In Stock 1.132On Order	Mfr. Part No. IUC-024-2 Mouser Part No 153-IUC-024-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.048In Stock 1.132On Order	0,748 € 0,556 € 0,438 € 0,371 € View 0,358 € 0,353 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.246 in	0.375 in	0.297 in	10-24
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUCC-M3-1 SI 1: 0,55 € 11.866In Stock	Mfr. Part No. IUCC-M3-1 Mouser Part No 153-IUCC-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	11.866In Stock	0,55 € 0,386 € 0,31 € 0,279 € View 0,258 € 0,251 € 0,237 € 0,231 € 0,224 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.05 mm	3.81 mm	5.56 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M8 SI 1: 1,25 € 10.201In Stock	Mfr. Part No. IUTC-M8 Mouser Part No 153-IUTC-M8	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10.201In Stock	1,25 € 0,929 € 0,722 € 0,679 € View 0,665 € 0,642 € 0,62 € 0,599 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	9.6 mm	12.7 mm	10.31 mm	M8
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M6-2 SI 1: 1,22 € 9.462In Stock	Mfr. Part No. IUC-M6-2 Mouser Part No 153-IUC-M6-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.462In Stock	1,22 € 0,912 € 0,706 € 0,665 € View 0,65 € 0,629 € 0,607 € 0,586 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.15 mm	12.7 mm	9.52 mm	M6
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: 0,447 € 10.572In 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	10.572In Stock 98.141On Order On Order Ship Dates Mfr. No: IUC-M3-2 Stock: 10.572 Can Dispatch Immediately On Order: 36.141 Pending 62.000 Expected 11/20/2026 Factory Lead Time: 20 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 € 7.918In 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	7.918In 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