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 .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-440-135 SI 1: 0,258 € 5.298In 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	5.298In 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, BRASS IUB-440-1 SI 1: 0,189 € 9.774In 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	9.774In 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 HI-TORQUE INSERT, ALUM IUTA-M5 SI 1: 0,413 € 811In 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	811In 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 € 7.224In 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	7.224In 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,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 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 € 0,144 € 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 € 8.245In 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	8.245In Stock	0,284 € 0,196 € 0,157 € 0,146 € View 0,123 € 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 € 9.510In 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	9.510In Stock	0,292 € 0,206 € 0,164 € 0,148 € 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 ULTRASONIC INSERT, BRASS IUB-632-1 SI 1: 0,206 € 98In Stock 10.000On Order	Mfr. Part No. IUB-632-1 Mouser Part No 153-IUB-632-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	98In Stock 10.000On Order	0,206 € 0,143 € 0,114 € 0,108 € View 0,091 € 0,087 € 0,085 € 0,083 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.199 in	0.15 in	0.219 in	6-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-256-1 SI 1: 0,413 € 4.909In Stock	Mfr. Part No. IUC-256-1 Mouser Part No 153-IUC-256-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	4.909In Stock	0,413 € 0,292 € 0,234 € 0,211 € View 0,196 € 0,19 € 0,18 € 0,175 € 0,169 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.118 in	0.115 in	0.141 in	2-56
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M6 SI 1: 0,697 € 841In Stock 10.000Expected 2/8/2027	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	841In Stock 10.000Expected 2/8/2027	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, BRASS IUTFB-M2.5 SI 1: 0,482 € 6.476In 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	6.476In 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 ULTRASONIC INSERT, BRASS IUB-M2.5-1 SI 1: 0,249 € 3.840In Stock 28.000On Order	Mfr. Part No. IUB-M2.5-1 Mouser Part No 153-IUB-M2.5-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3.840In Stock 28.000On Order On Order Ship Dates Mfr. No: IUB-M2.5-1 Stock: 3.840 Can Dispatch Immediately On Order: 22.197 Expected 11/10/2026 5.803 Expected 11/18/2026 Factory Lead Time: 17 Weeks	0,249 € 0,182 € 0,146 € 0,132 € View 0,122 € 0,119 € 0,112 € 0,109 € 0,106 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M2.5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M3.5 SI 1: 0,413 € 1.166In Stock	Mfr. Part No. IUTB-M3.5 Mouser Part No 153-IUTB-M3.5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1.166In Stock	0,413 € 0,293 € 0,235 € 0,212 € View 0,196 € 0,191 € 0,18 € 0,175 € 0,17 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.81 mm	7.14 mm	5.33 mm	M3.5
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 € 2.776In 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	2.776In 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 ISB-M3 DBL ENDED ISB-M3 SI 1: 0,344 € 4.564In Stock	Mfr. Part No. ISB-M3 Mouser Part No 153-ISB-M3	SI	Mounting Fixings ISB-M3 DBL ENDED Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	4.564In Stock	0,344 € 0,244 € 0,195 € 0,184 € View 0,156 € 0,149 € 0,146 € 0,141 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.99 mm	5.74 mm	4.62 mm	M3
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M4-2 SI 1: 0,292 € 3.318In Stock 10.000Expected 1/25/2027	Mfr. Part No. IUB-M4-2 Mouser Part No 153-IUB-M4-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3.318In Stock 10.000Expected 1/25/2027	0,292 € 0,208 € 0,167 € 0,151 € View 0,139 € 0,136 € 0,128 € 0,125 € 0,12 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.28 mm	7.92 mm	6.35 mm	M4
Mounting Fixings HI-TORQUE INSERT, ALUM IUTA-632 SI 1: 0,318 € 1.915In Stock	Mfr. Part No. IUTA-632 Mouser Part No 153-IUTA-632	SI	Mounting Fixings HI-TORQUE INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1.915In Stock	0,318 € 0,231 € 0,185 € 0,167 € View 0,155 € 0,151 € 0,142 € 0,138 € 0,134 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.189 in	0.281 in	0.21 in	6-32
Mounting Fixings HI-TORQUE INSERT IUTA-M4 SI 1: 0,361 € 177In Stock 10.000Expected 1/29/2027	Mfr. Part No. IUTA-M4 Mouser Part No 153-IUTA-M4	SI	Mounting Fixings HI-TORQUE INSERT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	177In Stock 10.000Expected 1/29/2027	0,361 € 0,256 € 0,206 € 0,185 € View 0,172 € 0,167 € 0,157 € 0,154 € 0,149 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS .225X.247 10-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-032-225 SI 1: 0,482 € 381In Stock	Mfr. Part No. IUTB-032-225 Mouser Part No 153-IUTB-032-225	SI	Mounting Fixings HI-TORQUE INSERT, BRASS .225X.247 10-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	381In Stock	0,482 € 0,347 € 0,278 € 0,249 € View 0,232 € 0,225 € 0,212 € 0,208 € 0,201 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.253 in	0.225 in		10-32
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-0420 SI 1: 0,679 € 405In Stock	Mfr. Part No. IUTFB-0420 Mouser Part No 153-IUTFB-0420	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	405In Stock	0,679 € 0,506 € 0,416 € 0,353 € View 0,35 € 0,338 € 0,326 € 0,321 €	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.316 in	0.5 in	0.375 in	1/4-20
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