Mounting Fixings – Mouser Switzerland

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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 (CHF) 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: 0.21 CHF 190 692In 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 692In Stock 12 674On Order On Order Ship Dates Mfr. No: IUB-M3-2 Stock: 190 692 Can Dispatch Immediately On Order: 8 041 Pending 4 633 Expected 16/10/2026 Factory Lead Time: 20 Weeks	0.21 CHF 0.143 CHF 0.115 CHF 0.108 CHF View 0.091 CHF 0.088 CHF 0.085 CHF 0.083 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-632-2 SI 1: 0.532 CHF 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	0.532 CHF 0.373 CHF 0.30 CHF 0.27 CHF View 0.25 CHF 0.243 CHF 0.228 CHF 0.224 CHF 0.216 CHF	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: 0.298 CHF 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	0.298 CHF 0.212 CHF 0.169 CHF 0.153 CHF View 0.141 CHF 0.138 CHF 0.129 CHF 0.127 CHF 0.123 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: 0.973 CHF 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	0.973 CHF 0.723 CHF 0.569 CHF 0.483 CHF View 0.466 CHF 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: 0.652 CHF 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	0.652 CHF 0.463 CHF 0.371 CHF 0.349 CHF View 0.296 CHF 0.284 CHF 0.278 CHF 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, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: 0.33 CHF 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	0.33 CHF 0.234 CHF 0.187 CHF 0.168 CHF View 0.156 CHF 0.153 CHF 0.143 CHF 0.14 CHF 0.135 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-632 SI 1: 0.636 CHF 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	0.636 CHF 0.446 CHF 0.358 CHF 0.337 CHF View 0.285 CHF 0.273 CHF 0.268 CHF 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: 0.177 CHF 26 588In Stock 25 000Expected 12/02/2027	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	26 588In Stock 25 000Expected 12/02/2027	0.177 CHF 0.128 CHF 0.102 CHF 0.093 CHF View 0.085 CHF 0.083 CHF 0.079 CHF 0.077 CHF 0.074 CHF	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: 0.298 CHF 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	0.298 CHF 0.21 CHF 0.168 CHF 0.158 CHF View 0.134 CHF 0.128 CHF 0.124 CHF 0.121 CHF	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 IUTC-M4 SI 1: 0.854 CHF 7 185In 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 185In Stock	0.854 CHF 0.638 CHF 0.497 CHF 0.469 CHF View 0.458 CHF 0.443 CHF 0.428 CHF 0.412 CHF 0.406 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: 0.515 CHF 9 660In 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 660In Stock	0.515 CHF 0.365 CHF 0.292 CHF 0.263 CHF View 0.244 CHF 0.237 CHF 0.223 CHF 0.218 CHF 0.211 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: 0.563 CHF 10 294In 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 294In Stock	0.563 CHF 0.396 CHF 0.317 CHF 0.285 CHF View 0.265 CHF 0.257 CHF 0.242 CHF 0.238 CHF 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: 1.07 CHF 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	1.07 CHF 0.787 CHF 0.613 CHF 0.578 CHF View 0.564 CHF 0.546 CHF 0.527 CHF 0.508 CHF 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: 0.756 CHF 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	0.756 CHF 0.533 CHF 0.427 CHF 0.385 CHF View 0.357 CHF 0.346 CHF 0.327 CHF 0.319 CHF Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: 0.434 CHF 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	0.434 CHF 0.307 CHF 0.245 CHF 0.221 CHF View 0.204 CHF 0.198 CHF 0.187 CHF 0.183 CHF 0.177 CHF	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 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: 0.378 CHF 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	0.378 CHF 0.268 CHF 0.215 CHF 0.193 CHF View 0.177 CHF 0.174 CHF 0.164 CHF 0.16 CHF 0.154 CHF	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: 0.693 CHF 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	0.693 CHF 0.491 CHF 0.394 CHF 0.354 CHF View 0.329 CHF 0.319 CHF 0.301 CHF 0.294 CHF 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-M3-2 SI 1: 0.418 CHF 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 20/11/2026 Factory Lead Time: 20 Weeks	0.418 CHF 0.299 CHF 0.239 CHF 0.215 CHF View 0.199 CHF 0.194 CHF 0.183 CHF 0.179 CHF 0.173 CHF	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: 0.418 CHF 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	0.418 CHF 0.294 CHF 0.236 CHF 0.222 CHF View 0.187 CHF 0.18 CHF 0.176 CHF 0.169 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M2.5 SI 1: 0.451 CHF 7 506In 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	7 506In Stock	0.451 CHF 0.325 CHF 0.259 CHF 0.233 CHF View 0.216 CHF 0.211 CHF 0.198 CHF 0.195 CHF 0.187 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M2.5	Bulk
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M3 SI 1: 0.354 CHF 23 690In Stock 15 000Expected 02/10/2026	Mfr. Part No. IUTFB-M3 Mouser Part No 153-IUTFB-M3	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	23 690In Stock 15 000Expected 02/10/2026	0.354 CHF 0.252 CHF 0.201 CHF 0.19 CHF View 0.161 CHF 0.154 CHF 0.151 CHF 0.146 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M3
Mounting Fixings HI-TORQUE INSERT IUTA-M3 SI 1: 0.257 CHF 14 310In Stock 17 000Expected 21/12/2026	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	14 310In Stock 17 000Expected 21/12/2026	0.257 CHF 0.185 CHF 0.148 CHF 0.134 CHF View 0.124 CHF 0.121 CHF 0.113 CHF 0.111 CHF 0.107 CHF	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: 0.684 CHF 38 057In 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	38 057In Stock	0.684 CHF 0.488 CHF 0.39 CHF 0.352 CHF View 0.326 CHF 0.317 CHF 0.30 CHF 0.293 CHF 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: 0.885 CHF 4 056In Stock 10 000Expected 17/11/2026	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	4 056In Stock 10 000Expected 17/11/2026	0.885 CHF 0.665 CHF 0.519 CHF 0.489 CHF View 0.478 CHF 0.462 CHF 0.446 CHF 0.43 CHF 0.423 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	4.7 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M5 SI 1: 0.749 CHF 7 621In Stock	Mfr. Part No. IUTC-M5 Mouser Part No 153-IUTC-M5	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7 621In Stock	0.749 CHF 0.56 CHF 0.435 CHF 0.411 CHF View 0.402 CHF 0.388 CHF 0.374 CHF 0.361 CHF 0.356 CHF	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	6.43 mm	9.52 mm	6.93 mm	M5