Mounting Fixings – Mouser Estonia

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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 HI-TORQUE INSERT, ALUMINUM 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-M4-470 SI 1: 0,327 € 928In Stock	Mfr. Part No. IUTA-M4-470 Mouser Part No 153-IUTA-M4-470	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	928In Stock	0,327 € 0,229 € 0,183 € 0,173 € View 0,146 € 0,14 € 0,137 € 0,132 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	5.67 mm	4.7 mm		M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-032 SI 1: 0,447 € 958In Stock	Mfr. Part No. IUTB-032 Mouser Part No 153-IUTB-032	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	958In Stock	0,447 € 0,313 € 0,251 € 0,237 € View 0,20 € 0,192 € 0,187 € 0,181 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.253 in	0.375 in	0.273 in	10-32
Mounting Fixings HI-TORQUE INSERT, BRASS .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-440-135 SI 1: 0,258 € 8.098In Stock	Mfr. Part No. IUTB-440-135 Mouser Part No 153-IUTB-440-135	SI	Mounting Fixings HI-TORQUE INSERT, BRASS .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8.098In Stock	0,258 € 0,181 € 0,144 € 0,136 € View 0,114 € 0,11 € 0,108 € 0,104 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.135 in		4-40
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M6-1 SI 1: 0,912 € 1.880In Stock	Mfr. Part No. IUC-M6-1 Mouser Part No 153-IUC-M6-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1.880In Stock	0,912 € 0,683 € 0,531 € 0,501 € View 0,49 € 0,474 € 0,458 € 0,441 € 0,434 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.86 mm	7.62 mm	9.52 mm	M6
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-032 SI 1: 0,834 € 1.184In Stock	Mfr. Part No. IUTC-032 Mouser Part No 153-IUTC-032	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1.184In Stock	0,834 € 0,621 € 0,489 € 0,415 € View 0,401 € 0,395 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.253 in	0.375 in	0.273 in	10-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-832 SI 1: 0,507 € 89In Stock	Mfr. Part No. IUTFB-832 Mouser Part No 153-IUTFB-832	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	89In Stock	0,507 € 0,363 € 0,291 € 0,261 € View 0,243 € 0,237 € 0,223 € 0,218 € 0,211 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.223 in	0.321 in	0.281 in	8-32	Bulk
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-032-1 SI 1: 0,344 € 33In Stock 10.000Expected 10/1/2026	Mfr. Part No. IUB-032-1 Mouser Part No 153-IUB-032-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	33In Stock 10.000Expected 10/1/2026	0,344 € 0,249 € 0,20 € 0,18 € View 0,167 € 0,162 € 0,153 € 0,15 € 0,144 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.267 in	0.225 in	0.297 in	10-32
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-440-1 SI 1: 0,189 € 9.994In Stock	Mfr. Part No. IUB-440-1 Mouser Part No 153-IUB-440-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.994In Stock	0,189 € 0,133 € 0,107 € 0,101 € View 0,084 € 0,081 € 0,079 € 0,077 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.153 in	0.135 in	0.172 in	4-40
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M4-1 SI 1: 0,241 € 8.011In Stock	Mfr. Part No. IUB-M4-1 Mouser Part No 153-IUB-M4-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8.011In Stock	0,241 € 0,173 € 0,138 € 0,125 € View 0,115 € 0,113 € 0,106 € 0,103 € 0,10 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.74 mm	4.7 mm	6.35 mm	M4
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-M5 SI 1: 0,413 € 1.211In Stock	Mfr. Part No. IUTA-M5 Mouser Part No 153-IUTA-M5	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1.211In Stock	0,413 € 0,292 € 0,234 € 0,221 € View 0,187 € 0,179 € 0,175 € 0,169 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M2 SI 1: 0,421 € 7.339In Stock	Mfr. Part No. IUTC-M2 Mouser Part No 153-IUTC-M2	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7.339In Stock	0,421 € 0,298 € 0,238 € 0,224 € View 0,19 € 0,182 € 0,178 € 0,172 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-832-2 SI 1: 0,284 € 9.721In Stock	Mfr. Part No. IUB-832-2 Mouser Part No 153-IUB-832-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.721In Stock	0,284 € 0,20 € 0,16 € 0,146 € View 0,131 € 0,129 € 0,122 € 0,12 € 0,115 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.208 in	0.312 in	0.25 in	8-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-440 SI 1: 0,284 € 8.624In Stock	Mfr. Part No. IUTB-440 Mouser Part No 153-IUTB-440	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8.624In Stock	0,284 € 0,196 € 0,157 € 0,144 € View 0,129 € 0,127 € 0,12 € 0,117 € 0,114 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.226 in	0.179 in	4-40
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-632 SI 1: 0,292 € 9.852In Stock	Mfr. Part No. IUTB-632 Mouser Part No 153-IUTB-632	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.852In Stock	0,292 € 0,206 € 0,164 € 0,15 € View 0,134 € 0,133 € 0,126 € 0,123 € 0,119 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.189 in	0.281 in	0.21 in	6-32
Mounting Fixings ISC-M4 DBL ENDED NUT ISC-M4 SI 1: 0,86 € 230In Stock	Mfr. Part No. ISC-M4 Mouser Part No 153-ISC-M4	SI	Mounting Fixings ISC-M4 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	230In Stock	0,86 € 0,643 € 0,501 € 0,472 € View 0,462 € 0,446 € 0,431 € 0,415 € 0,409 €	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	5.62 mm	8.15 mm	6.22 mm	M4
Mounting Fixings ISC-M5 DBL ENDED NUT ISC-M5 SI 1: 0,937 € 65In Stock	Mfr. Part No. ISC-M5 Mouser Part No 153-ISC-M5	SI	Mounting Fixings ISC-M5 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	65In Stock	0,937 € 0,701 € 0,545 € 0,514 € View 0,503 € 0,486 € 0,47 € 0,452 € 0,446 €	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	6.4 mm	9.52 mm	7.01 mm	M5
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-632-1 SI 1: 0,241 € 392In Stock	Mfr. Part No. IUA-632-1 Mouser Part No 153-IUA-632-1	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	392In Stock	0,241 € 0,171 € 0,137 € 0,123 € View 0,114 € 0,111 € 0,105 € 0,102 € 0,099 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.199 in	0.15 in	0.219 in	6-32
Mounting Fixings ULTRASONIC INSERT, ALUMINUM IUA-M2.5-2 SI 1: 0,335 € 885In Stock	Mfr. Part No. IUA-M2.5-2 Mouser Part No 153-IUA-M2.5-2	SI	Mounting Fixings ULTRASONIC INSERT, ALUMINUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	885In Stock	0,335 € 0,235 € 0,188 € 0,177 € View 0,15 € 0,144 € 0,14 € 0,136 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, AL IUA-M3-1 SI 1: 0,224 € 294In Stock 10.000Expected 10/23/2026	Mfr. Part No. IUA-M3-1 Mouser Part No 153-IUA-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, AL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	294In Stock 10.000Expected 10/23/2026	0,224 € 0,155 € 0,124 € 0,117 € View 0,098 € 0,094 € 0,092 € 0,089 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-0420-1 SI 1: 1,04 € 114In Stock	Mfr. Part No. IUC-0420-1 Mouser Part No 153-IUC-0420-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	114In Stock	1,04 € 0,782 € 0,608 € 0,574 € View 0,561 € 0,542 € 0,524 € 0,505 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.349 in	0.3 in	0.375 in	1/4-20
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-832-2 SI 1: 0,705 € 1.265In Stock	Mfr. Part No. IUC-832-2 Mouser Part No 153-IUC-832-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1.265In Stock	0,705 € 0,495 € 0,396 € 0,373 € View 0,316 € 0,304 € 0,297 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.208 in	0.312 in	0.25 in	8-32
Mounting Fixings HI-TORQUE INSERT, ALUMINUM .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-0420-300 SI 1: 0,533 € 615In Stock	Mfr. Part No. IUTA-0420-300 Mouser Part No 153-IUTA-0420-300	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	615In Stock	0,533 € 0,378 € 0,304 € 0,273 € View 0,254 € 0,247 € 0,232 € 0,227 € 0,219 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.316 in	0.3 in	0.342 in	1/4-20
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M3.5 SI 1: 0,636 € 4.655In Stock 5.250Expected 10/30/2026	Mfr. Part No. IUTC-M3.5 Mouser Part No 153-IUTC-M3.5	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	4.655In Stock 5.250Expected 10/30/2026	0,636 € 0,448 € 0,359 € 0,338 € View 0,286 € 0,274 € 0,268 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.81 mm	7.14 mm	5.33 mm	M3.5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3.5 SI 1: 0,49 € 341In Stock	Mfr. Part No. IUTFB-M3.5 Mouser Part No 153-IUTFB-M3.5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	341In Stock	0,49 € 0,353 € 0,282 € 0,254 € View 0,236 € 0,23 € 0,216 € 0,212 € 0,205 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.81 mm	7.14 mm	6.35 mm	M3.5	Bulk
Mounting Fixings ISA-032 DBL ENDED NUT ISA-032 SI 1: 0,43 € 986In Stock	Mfr. Part No. ISA-032 Mouser Part No 153-ISA-032	SI	Mounting Fixings ISA-032 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	986In Stock	0,43 € 0,307 € 0,246 € 0,221 € View 0,206 € 0,20 € 0,188 € 0,184 € 0,178 €	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Aluminum	0.252 in	0.375 in	0.276 in	10-32