Mounting Hardware – Mouser Puerto Rico

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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 (USD) 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
Mounting Hardware ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: $0.26 A tariff of 8% may be applied if shipping to the United States. 187,378In Stock 12,674On Order	Mfr. Part # IUB-M3-2 Mouser Part # 153-IUB-M3-2	SI	Mounting Hardware ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	187,378In Stock 12,674On Order	$0.26 $0.178 $0.143 $0.134 View $0.113 $0.109 $0.106 $0.103 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Hardware ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: $0.52 A tariff of 8% may be applied if shipping to the United States. 40,422In Stock 68,141On Order	Mfr. Part # IUC-M3-2 Mouser Part # 153-IUC-M3-2	SI	Mounting Hardware ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	40,422In Stock 68,141On Order On Order Ship Dates Mfr. #: IUC-M3-2 Stock: 40,422 Can Ship Immediately On Order: 6,141 Pending 62,000 Expected 11/10/2026 Factory Lead-Time: 19 Weeks	$0.52 $0.371 $0.297 $0.267 View $0.248 $0.241 $0.227 $0.222 $0.215 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Hardware HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: $0.41 14,444In Stock	Mfr. Part # IUTB-M3-343 Mouser Part # 153-IUTB-M3-343	SI	Mounting Hardware HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14,444In Stock	$0.41 $0.291 $0.233 $0.209 View $0.194 $0.189 $0.178 $0.174 $0.168	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Hardware HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: $1.21 3,764In Stock	Mfr. Part # IUTC-0420 Mouser Part # 153-IUTC-0420	SI	Mounting Hardware HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3,764In Stock	$1.21 $0.898 $0.707 $0.60 View $0.579 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.316 in	0.5 in	0.342 in	1/4-20
Mounting Hardware HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M3-343 SI 1: $0.81 8,486In Stock	Mfr. Part # IUTC-M3-343 Mouser Part # 153-IUTC-M3-343	SI	Mounting Hardware 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	8,486In Stock	$0.81 $0.575 $0.461 $0.434 View $0.368 $0.352 $0.345 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	3.43 mm	4.55 mm	M3
Mounting Hardware HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: $0.47 9,561In Stock	Mfr. Part # IUTB-M2-318 Mouser Part # 153-IUTB-M2-318	SI	Mounting Hardware HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,561In Stock	$0.47 $0.333 $0.267 $0.24 View $0.217 $0.216 $0.204 $0.199 $0.192	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.18 mm		M2
Mounting Hardware ULTRASONIC INSERT, STAINLESS IUC-632-2 SI 1: $0.66 A tariff of 8% may be applied if shipping to the United States. 6,783In Stock	Mfr. Part # IUC-632-2 Mouser Part # 153-IUC-632-2	SI	Mounting Hardware ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	6,783In Stock	$0.66 $0.464 $0.372 $0.335 View $0.31 $0.302 $0.284 $0.278 Quote A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.185 in	0.25 in	0.219 in	6-32
Mounting Hardware HI-TORQUE INSERT, BRASS IUTB-M3 SI 1: $0.37 A tariff of 8% may be applied if shipping to the United States. 59,979In Stock	Mfr. Part # IUTB-M3 Mouser Part # 153-IUTB-M3	SI	Mounting Hardware HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	59,979In Stock	$0.37 $0.263 $0.21 $0.189 View $0.176 $0.171 $0.161 $0.158 $0.152 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Hardware HI-TORQUE INSERT, STAINLESS IUTC-632 SI 1: $0.79 8,105In Stock	Mfr. Part # IUTC-632 Mouser Part # 153-IUTC-632	SI	Mounting Hardware HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,105In Stock	$0.79 $0.555 $0.445 $0.419 View $0.355 $0.34 $0.333 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.189 in	0.281 in	0.21 in	6-32
Mounting Hardware HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M5-572 SI 1: $0.56 A tariff of 11% may be applied if shipping to the United States. 10,311In Stock	Mfr. Part # IUTB-M5-572 Mouser Part # 153-IUTB-M5-572	SI	Mounting Hardware HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,311In Stock	$0.56 $0.397 $0.318 $0.286 View $0.266 $0.258 $0.244 $0.238 $0.23 A tariff of 11% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	5.72 mm		M5
Mounting Hardware HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: $0.54 A tariff of 38% may be applied if shipping to the United States. 9,923In Stock	Mfr. Part # IUTC-M2-318 Mouser Part # 153-IUTC-M2-318	SI	Mounting Hardware 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	$0.54 $0.381 $0.305 $0.274 View $0.254 $0.247 $0.233 $0.228 $0.22 A tariff of 38% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	3.18 mm	3.73 mm	M2
Mounting Hardware HI-TORQUE INSERT, STAINLESS IUTC-M2.5 SI 1: $0.86 A tariff of 38% may be applied if shipping to the United States. 10,312In Stock	Mfr. Part # IUTC-M2.5 Mouser Part # 153-IUTC-M2.5	SI	Mounting Hardware HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,312In Stock	$0.86 $0.61 $0.489 $0.44 View $0.408 $0.396 $0.374 $0.365 Quote A tariff of 38% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M2.5
Mounting Hardware ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: $0.64 9,560In Stock	Mfr. Part # IUB-M5-2 Mouser Part # 153-IUB-M5-2	SI	Mounting Hardware ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,560In Stock	$0.64 $0.453 $0.363 $0.327 View $0.303 $0.294 $0.277 $0.271 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Hardware ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: $0.70 A tariff of 8% may be applied if shipping to the United States. 10,229In Stock	Mfr. Part # IUC-M2.5-1 Mouser Part # 153-IUC-M2.5-1	SI	Mounting Hardware ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,229In Stock	$0.70 $0.492 $0.394 $0.355 View $0.329 $0.32 $0.301 $0.295 Quote A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.89 mm	3.43 mm	4.37 mm	M2.5
Mounting Hardware HI-TORQUE INSERT, BRASS IUTB-832 SI 1: $0.37 A tariff of 8% may be applied if shipping to the United States. 13,080In Stock	Mfr. Part # IUTB-832 Mouser Part # 153-IUTB-832	SI	Mounting Hardware HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	13,080In Stock	$0.37 $0.26 $0.208 $0.196 View $0.166 $0.159 $0.155 $0.15 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.223 in	0.321 in	0.243 in	8-32
Mounting Hardware HI-TORQUE INSERT, STAINLESS IUTC-M6 SI 1: $1.32 A tariff of 38% may be applied if shipping to the United States. 9,053In Stock	Mfr. Part # IUTC-M6 Mouser Part # 153-IUTC-M6	SI	Mounting Hardware HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,053In Stock	$1.32 $0.978 $0.762 $0.718 View $0.701 $0.678 $0.655 $0.631 Quote A tariff of 38% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	8.03 mm	12.7 mm	8.69 mm	M6
Mounting Hardware HI-TORQUE INSERT, BRASS IUTFB-M5 SI 1: $0.94 9,727In Stock	Mfr. Part # IUTFB-M5 Mouser Part # 153-IUTFB-M5	SI	Mounting Hardware HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,727In Stock	$0.94 $0.662 $0.53 $0.478 View $0.443 $0.43 $0.406 $0.397 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Hardware HI-TORQUE INSERT, BRASS IUTFB-M3 SI 1: $0.44 21,627In Stock 16,000Expected 2/24/2027	Mfr. Part # IUTFB-M3 Mouser Part # 153-IUTFB-M3	SI	Mounting Hardware HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	21,627In Stock 16,000Expected 2/24/2027	$0.44 $0.313 $0.25 $0.236 View $0.20 $0.191 $0.187 $0.181	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	5.54 mm	M3
Mounting Hardware HI-TORQUE INSERT, BRASS IUTB-M4 SI 1: $0.51 A tariff of 8% may be applied if shipping to the United States. 12,138In Stock	Mfr. Part # IUTB-M4 Mouser Part # 153-IUTB-M4	SI	Mounting Hardware HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	12,138In Stock	$0.51 $0.363 $0.29 $0.261 View $0.243 $0.236 $0.222 $0.218 $0.21 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Hardware ULTRASONIC INSERT, STAINLESS IUC-M3-1 SI 1: $0.48 A tariff of 8% may be applied if shipping to the United States. 9,492In Stock	Mfr. Part # IUC-M3-1 Mouser Part # 153-IUC-M3-1	SI	Mounting Hardware ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,492In Stock	$0.48 $0.343 $0.275 $0.247 View $0.23 $0.223 $0.21 $0.206 $0.199 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Hardware ULTRASONIC INSERT, STAINLESS IUC-M4-1 SI 1: $0.60 A tariff of 8% may be applied if shipping to the United States. 9,845In Stock	Mfr. Part # IUC-M4-1 Mouser Part # 153-IUC-M4-1	SI	Mounting Hardware ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,845In Stock	$0.60 $0.426 $0.341 $0.321 View $0.272 $0.261 $0.255 Quote A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.74 mm	4.7 mm	6.35 mm	M4
Mounting Hardware ULTRASONIC INSERT, STAINLESS IUC-440-2 SI 1: $0.53 8,745In Stock	Mfr. Part # IUC-440-2 Mouser Part # 153-IUC-440-2	SI	Mounting Hardware ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,745In Stock	$0.53 $0.373 $0.298 $0.281 View $0.238 $0.228 $0.223 $0.215	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.141 in	0.219 in	0.172 in	4-40
Mounting Hardware HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: $1.06 A tariff of 8% may be applied if shipping to the United States. 4,695In Stock 10,000Expected 3/5/2027	Mfr. Part # IUTC-M4 Mouser Part # 153-IUTC-M4	SI	Mounting Hardware HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	4,695In Stock 10,000Expected 3/5/2027	$1.06 $0.793 $0.617 $0.582 View $0.569 $0.55 $0.531 $0.512 Quote A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Hardware HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: $0.60 26,933In Stock 11,000Expected 11/10/2026	Mfr. Part # IUTFB-M4 Mouser Part # 153-IUTFB-M4	SI	Mounting Hardware HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	26,933In Stock 11,000Expected 11/10/2026	$0.60 $0.429 $0.343 $0.309 View $0.287 $0.279 $0.263 $0.257 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	7.14 mm	M4
Mounting Hardware ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: $0.22 22,694In Stock 52,000On Order	Mfr. Part # IUB-M3-1 Mouser Part # 153-IUB-M3-1	SI	Mounting Hardware ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	22,694In Stock 52,000On Order On Order Ship Dates Mfr. #: IUB-M3-1 Stock: 22,694 Can Ship Immediately On Order: 25,000 Expected 2/12/2027 27,000 Expected 3/12/2027 Factory Lead-Time: 17 Weeks	$0.22 $0.159 $0.127 $0.115 View $0.106 $0.103 $0.098 $0.095 $0.092	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M3