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: 0,231 € 187.060In 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	187.060In Stock 12.674On Order	0,231 € 0,158 € 0,127 € 0,119 € View 0,10 € 0,097 € 0,094 € 0,091 €	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: 0,462 € 92.488In 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	92.488In Stock 16.125On Order	0,462 € 0,329 € 0,264 € 0,237 € View 0,22 € 0,214 € 0,202 € 0,197 € 0,191 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: 0,622 € 10.154In 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	10.154In Stock	0,622 € 0,437 € 0,35 € 0,315 € View 0,292 € 0,284 € 0,267 € 0,262 € 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: 0,329 € 13.030In 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	13.030In Stock	0,329 € 0,231 € 0,185 € 0,174 € View 0,147 € 0,141 € 0,138 € 0,133 €	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 STEEL .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-440-135 SI 1: 0,551 € 9.296In Stock	Mfr. Part No. IUTC-440-135 Mouser Part No 153-IUTC-440-135	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9.296In Stock	0,551 € 0,387 € 0,31 € 0,292 € View 0,248 € 0,237 € 0,232 € 0,224 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.158 in	0.135 in	0.179 in	4-40
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M6 SI 1: 1,17 € 8.953In 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	8.953In Stock	1,17 € 0,868 € 0,677 € 0,638 € View 0,622 € 0,602 € 0,582 € 0,56 € 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: 0,835 € 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	0,835 € 0,588 € 0,471 € 0,424 € View 0,393 € 0,382 € 0,361 € 0,353 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: 0,568 € 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	0,568 € 0,402 € 0,322 € 0,29 € View 0,269 € 0,261 € 0,246 € 0,241 € 0,233 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: 0,364 € 13.385In 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	13.385In Stock	0,364 € 0,258 € 0,207 € 0,186 € View 0,172 € 0,168 € 0,158 € 0,155 € 0,149 €	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: 1,07 € 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	1,07 € 0,797 € 0,628 € 0,533 € View 0,514 € 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: 0,719 € 8.125In 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	8.125In Stock	0,719 € 0,511 € 0,409 € 0,385 € View 0,327 € 0,313 € 0,306 € 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-M2.5 SI 1: 0,764 € 9.692In 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	9.692In Stock	0,764 € 0,542 € 0,434 € 0,391 € View 0,362 € 0,352 € 0,332 € 0,324 € 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-632-2 SI 1: 0,586 € 6.058In 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	6.058In Stock	0,586 € 0,412 € 0,33 € 0,297 € View 0,275 € 0,268 € 0,252 € 0,247 € 0,239 €	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: 0,329 € 56.673In 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	56.673In Stock	0,329 € 0,234 € 0,186 € 0,168 € View 0,156 € 0,152 € 0,143 € 0,14 € 0,135 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: 0,417 € 9.541In 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	9.541In Stock	0,417 € 0,296 € 0,237 € 0,223 € View 0,189 € 0,181 € 0,177 € 0,17 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.18 mm		M2
Mounting Fixings ULTRASONIC,INSERT,STAINLESS IUCC-M5-2 SI 1: 0,888 € 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	0,888 € 0,66 € 0,514 € 0,484 € View 0,473 € 0,457 € 0,441 € 0,425 € 0,419 €	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: 0,48 € 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	0,48 € 0,338 € 0,271 € 0,243 € View 0,226 € 0,219 € 0,207 € 0,202 € 0,195 €	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: 0,497 € 10.291In 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	10.291In Stock	0,497 € 0,353 € 0,282 € 0,254 € View 0,236 € 0,229 € 0,217 € 0,211 € 0,204 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	5.72 mm		M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-440 SI 1: 0,426 € 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	0,426 € 0,299 € 0,24 € 0,216 € View 0,194 € 0,183 € 0,179 € 0,173 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.158 in	0.226 in	0.218 in	4-40	Bulk
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: 0,195 € 20.334In 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	20.334In Stock 52.000On Order On Order Ship Dates Mfr. No: IUB-M3-1 Stock: 20.334 Can Dispatch Immediately On Order: 25.000 Expected 2/12/2027 27.000 Expected 3/12/2027 Factory Lead Time: 20 Weeks	0,195 € 0,141 € 0,113 € 0,102 € View 0,094 € 0,091 € 0,087 € 0,084 € 0,082 €	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: 0,408 € 13.944In Stock 10.000Expected 3/19/2027	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	13.944In Stock 10.000Expected 3/19/2027	0,408 € 0,295 € 0,236 € 0,212 € View 0,197 € 0,192 € 0,181 € 0,177 € 0,17 €	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: 0,702 € 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 2/12/2027 Factory Lead Time: 21 Weeks	0,702 € 0,522 € 0,43 € 0,364 € View 0,361 € 0,349 € 0,337 € 0,331 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.03 mm	12.7 mm	9.53 mm	M6	Bulk
Mounting Fixings HI-TORQUE INSERT IUTA-M3 SI 1: 0,284 € 12.190In Stock 17.000Expected 12/21/2026	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	12.190In Stock 17.000Expected 12/21/2026	0,284 € 0,204 € 0,163 € 0,147 € View 0,137 € 0,133 € 0,125 € 0,123 € 0,118 €	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: 0,755 € 31.933In 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	31.933In Stock	0,755 € 0,538 € 0,431 € 0,388 € View 0,36 € 0,35 € 0,33 € 0,323 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M4-470 SI 1: 0,977 € 3.396In Stock 10.000Expected 11/17/2026	Mfr. Part No. IUTC-M4-470 Mouser Part No 153-IUTC-M4-470	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3.396In Stock 10.000Expected 11/17/2026	0,977 € 0,734 € 0,572 € 0,539 € View 0,527 € 0,51 € 0,492 € 0,474 € 0,467 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	4.7 mm	6.17 mm	M4