Mounting Fixings – Mouser South Africa

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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 Fixings ISB-M4 DBL ENDED NUT ISB-M4 SI 1: $0.68 363In Stock	Mfr. Part No. ISB-M4 Mouser Part No 153-ISB-M4	SI	Mounting Fixings ISB-M4 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	363In Stock	$0.68 $0.49 $0.391 $0.352 View $0.327 $0.317 $0.30 $0.293 Quote	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Brass	5.62 mm	8.15 mm	6.22 mm	M4
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-M5-2 SI 1: $0.361 1,121In Stock	Mfr. Part No. IUA-M5-2 Mouser Part No 153-IUA-M5-2	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,121In Stock	$0.361 $0.251 $0.201 $0.19 View $0.16 $0.154 $0.15 $0.145	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3.5-2 SI 1: $0.29 1,230In Stock	Mfr. Part No. IUB-M3.5-2 Mouser Part No 153-IUB-M3.5-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,230In Stock	$0.29 $0.204 $0.163 $0.154 View $0.13 $0.124 $0.122 $0.117	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.7 mm	6.35 mm	5.56 mm	M3.5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-032-2 SI 1: $0.89 525In Stock	Mfr. Part No. IUC-032-2 Mouser Part No 153-IUC-032-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	525In Stock	$0.89 $0.665 $0.518 $0.488 View $0.478 $0.462 $0.447 $0.43 $0.423	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.246 in	0.375 in	0.297 in	10-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-832-1 SI 1: $0.63 489In Stock	Mfr. Part No. IUC-832-1 Mouser Part No 153-IUC-832-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	489In Stock	$0.63 $0.448 $0.359 $0.323 View $0.30 $0.292 $0.276 $0.269 $0.261	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.226 in	0.185 in	0.25 in	8-32
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-2 SI 1: $0.711 1,249In Stock	Mfr. Part No. IUC-M2.5-2 Mouser Part No 153-IUC-M2.5-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,249In Stock	$0.711 $0.504 $0.404 $0.38 View $0.322 $0.309 $0.302 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, BRASS IUBB-M3-1 SI 1: $0.37 8,593In 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	8,593In Stock	$0.37 $0.263 $0.211 $0.198 View $0.167 $0.16 $0.157 $0.152	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: $0.83 954In 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	954In Stock	$0.83 $0.59 $0.472 $0.444 View $0.377 $0.361 $0.354 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: $0.32 7,320In 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	7,320In Stock	$0.32 $0.221 $0.177 $0.166 View $0.141 $0.135 $0.133 $0.127	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: $0.311 364In Stock 10,000Expected 2026/10/30	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	364In Stock 10,000Expected 2026/10/30	$0.311 $0.214 $0.171 $0.16 View $0.136 $0.13 $0.128 $0.123	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: $0.42 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	$0.42 $0.302 $0.241 $0.217 View $0.202 $0.197 $0.185 $0.181 $0.176	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.127 in	0.157 in	0.147 in	2-56
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-832 SI 1: $0.911 131In Stock	Mfr. Part No. IUTC-832 Mouser Part No 153-IUTC-832	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	131In Stock	$0.911 $0.684 $0.533 $0.502 View $0.491 $0.476 $0.458 $0.442 $0.435	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.223 in	0.321 in	0.243 in	8-32
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M2.5-1 SI 1: $0.29 8,661In Stock 28,000Expected 2026/11/20	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	8,661In Stock 28,000Expected 2026/11/20	$0.29 $0.212 $0.17 $0.154 View $0.142 $0.138 $0.13 $0.127 $0.123	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-0420-2 SI 1: $1.40 98In Stock	Mfr. Part No. IUC-0420-2 Mouser Part No 153-IUC-0420-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	98In Stock	$1.40 $1.04 $0.812 $0.69 View $0.665 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.321 in	0.5 in	0.375 in	1/4-20
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-256-2 SI 1: $0.711 798In Stock	Mfr. Part No. IUC-256-2 Mouser Part No 153-IUC-256-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	798In Stock	$0.711 $0.508 $0.406 $0.366 View $0.34 $0.33 $0.311 $0.305 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.107 in	0.188 in	0.141 in	2-56
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-0420 SI 1: $0.811 353In Stock	Mfr. Part No. IUTB-0420 Mouser Part No 153-IUTB-0420	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	353In Stock	$0.811 $0.576 $0.472 $0.40 View $0.384 $0.374 $0.352 $0.345 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.316 in	0.5 in	0.342 in	1/4-20
Mounting Fixings HI-TORQUE INSERT, BRASS .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-0420-300 SI 1: $0.89 14In Stock	Mfr. Part No. IUTB-0420-300 Mouser Part No 153-IUTB-0420-300	SI	Mounting Fixings HI-TORQUE INSERT, BRASS .300X.310 1/4-20 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14In Stock	$0.89 $0.638 $0.511 $0.459 View $0.427 $0.415 $0.391 $0.383 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.316 in	0.3 in	0.342 in	1/4-20
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M4 SI 1: $0.511 3,993In Stock 10,000Expected 2026/11/27	Mfr. Part No. IUTB-M4 Mouser Part No 153-IUTB-M4	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	3,993In Stock 10,000Expected 2026/11/27	$0.511 $0.363 $0.29 $0.261 View $0.243 $0.236 $0.222 $0.217 $0.211	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS 7.62X7.87 M6 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M6-762 SI 1: $0.811 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	$0.811 $0.576 $0.461 $0.434 View $0.368 $0.352 $0.345 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: $0.97 2,976In 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	2,976In Stock	$0.97 $0.69 $0.565 $0.479 View $0.461 $0.448 $0.422 $0.413 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	9.6 mm	12.7 mm	10.31 mm	M8
Mounting Fixings ULTRASONIC INSERT, ALUM IUA-M5-1 SI 1: $0.34 331In 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	331In Stock	$0.34 $0.24 $0.192 $0.181 View $0.154 $0.147 $0.143 $0.138	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: $0.62 754In Stock	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	754In Stock	$0.62 $0.442 $0.354 $0.317 View $0.297 $0.287 $0.271 $0.265 $0.256	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: $0.62 594In 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	594In Stock	$0.62 $0.44 $0.354 $0.333 View $0.281 $0.269 $0.264 $0.255	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: $0.34 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	$0.34 $0.247 $0.198 $0.178 View $0.165 $0.16 $0.151 $0.148 $0.143	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: $0.33 659In 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	659In Stock	$0.33 $0.235 $0.188 $0.169 View $0.157 $0.154 $0.144 $0.141 $0.136	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.158 in	0.226 in	0.179 in	4-40