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, BRASS 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M6-762 SI 1: 0,697 € 119In Stock	Mfr. Part No. IUTB-M6-762 Mouser Part No 153-IUTB-M6-762	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	119In 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	7.62 mm		M6
Mounting Fixings HI-TORQUE INSERT, BRASS 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M8 SI 1: 0,834 € 2.826In Stock	Mfr. Part No. IUTB-M8 Mouser Part No 153-IUTB-M8	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 12.70X9.50 M8 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	2.826In Stock	0,834 € 0,593 € 0,486 € 0,412 € View 0,396 € 0,385 € 0,363 € 0,355 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	9.6 mm	12.7 mm	10.31 mm	M8
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-032-1 SI 1: 0,344 € 33In Stock 10.000Expected 1/29/2027	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 1/29/2027	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-M4-1 SI 1: 0,241 € 2.661In Stock 20.000On Order	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	2.661In Stock 20.000On Order On Order Ship Dates Mfr. No: IUB-M4-1 Stock: 2.661 Can Dispatch Immediately On Order: 10.000 Expected 2/8/2027 10.000 Expected 2/26/2027 Factory Lead Time: 17 Weeks	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 ULTRASONIC INSERT, BRASS IUBB-M3-1 SI 1: 0,318 € 8.373In Stock	Mfr. Part No. IUBB-M3-1 Mouser Part No 153-IUBB-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8.373In Stock	0,318 € 0,226 € 0,181 € 0,17 € View 0,144 € 0,138 € 0,135 € 0,131 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.05 mm	3.81 mm	5.56 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-032-1 SI 1: 0,714 € 943In Stock	Mfr. Part No. IUC-032-1 Mouser Part No 153-IUC-032-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	943In Stock	0,714 € 0,507 € 0,406 € 0,382 € View 0,324 € 0,31 € 0,304 € Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.267 in	0.225 in	0.297 in	10-32
Mounting Fixings HI-TORQUE INSERT IUTA-M2 SI 1: 0,275 € 7.220In Stock	Mfr. Part No. IUTA-M2 Mouser Part No 153-IUTA-M2	SI	Mounting Fixings HI-TORQUE INSERT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7.220In Stock	0,275 € 0,19 € 0,152 € 0,143 € View 0,121 € 0,116 € 0,114 € 0,109 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT, ALUMINUM 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-M3-343 SI 1: 0,267 € 360In Stock 10.000Expected 10/30/2026	Mfr. Part No. IUTA-M3-343 Mouser Part No 153-IUTA-M3-343	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	360In Stock 10.000Expected 10/30/2026	0,267 € 0,184 € 0,147 € 0,138 € View 0,117 € 0,112 € 0,11 € 0,106 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	4.01 mm	3.43 mm		M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-256 SI 1: 0,361 € 252In Stock	Mfr. Part No. IUTB-256 Mouser Part No 153-IUTB-256	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	252In Stock	0,361 € 0,26 € 0,207 € 0,187 € View 0,174 € 0,169 € 0,159 € 0,156 € 0,151 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.127 in	0.157 in	0.147 in	2-56
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M2 SI 1: 0,413 € 7.544In Stock 10.000Expected 2/12/2027	Mfr. Part No. IUTFB-M2 Mouser Part No 153-IUTFB-M2	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7.544In Stock 10.000Expected 2/12/2027	0,413 € 0,297 € 0,237 € 0,214 € View 0,199 € 0,193 € 0,182 € 0,178 € 0,172 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.99 mm	4.75 mm	M2	Bulk
Mounting Fixings ISC-440 DBL ENDED NUT ISC-440 SI 1: 0,585 € 557In Stock	Mfr. Part No. ISC-440 Mouser Part No 153-ISC-440	SI	Mounting Fixings ISC-440 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	557In Stock	0,585 € 0,413 € 0,33 € 0,311 € View 0,264 € 0,253 € 0,247 € 0,239 €	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	0.157 in	0.226 in	0.182 in	4-40
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, ALUMINUM IUA-M2.5-2 SI 1: 0,335 € 785In 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	785In 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, BRASS IUB-M6-1 SI 1: 0,49 € 858In Stock 10.000Expected 1/29/2027	Mfr. Part No. IUB-M6-1 Mouser Part No 153-IUB-M6-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	858In Stock 10.000Expected 1/29/2027	0,49 € 0,353 € 0,283 € 0,255 € View 0,237 € 0,23 € 0,217 € 0,212 € 0,205 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.86 mm	7.62 mm	9.52 mm	M6
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 € 1.215In 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	1.215In 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, BRASS IUTB-M5 SI 1: 0,447 € 6.108In 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	6.108In 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, 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 € 337In 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	337In 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 ULTRASONIC INSERT, ALUM IUA-M5-1 SI 1: 0,292 € 81In Stock	Mfr. Part No. IUA-M5-1 Mouser Part No 153-IUA-M5-1	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	81In Stock	0,292 € 0,206 € 0,165 € 0,156 € View 0,132 € 0,126 € 0,123 € 0,119 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.78 mm	5.72 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-032-2 SI 1: 0,533 € 744In Stock 10.000Expected 2/5/2027	Mfr. Part No. IUB-032-2 Mouser Part No 153-IUB-032-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	744In Stock 10.000Expected 2/5/2027	0,533 € 0,38 € 0,304 € 0,273 € View 0,255 € 0,247 € 0,233 € 0,228 € 0,22 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.246 in	0.375 in	0.297 in	10-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUCC-M3-2 SI 1: 0,533 € 344In Stock	Mfr. Part No. IUCC-M3-2 Mouser Part No 153-IUCC-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	344In Stock	0,533 € 0,378 € 0,304 € 0,286 € View 0,242 € 0,231 € 0,227 € 0,219 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.7 mm	6.35 mm	5.56 mm	M3
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-256 SI 1: 0,292 € 253In Stock	Mfr. Part No. IUTA-256 Mouser Part No 153-IUTA-256	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	253In Stock	0,292 € 0,212 € 0,17 € 0,153 € View 0,142 € 0,138 € 0,13 € 0,127 € 0,123 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.127 in	0.157 in	0.147 in	2-56
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-440 SI 1: 0,284 € 559In Stock	Mfr. Part No. IUTA-440 Mouser Part No 153-IUTA-440	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	559In Stock	0,284 € 0,202 € 0,162 € 0,145 € View 0,135 € 0,132 € 0,124 € 0,121 € 0,117 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.158 in	0.226 in	0.179 in	4-40