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	Packaging
Mounting Fixings HI-TORQUE INSERT, ALUMINUM .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTA-440-135 SI 1: $0.33 946In Stock	Mfr. Part No. IUTA-440-135 Mouser Part No 153-IUTA-440-135	SI	Mounting Fixings HI-TORQUE INSERT, ALUMINUM .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	946In 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	0.135 in		4-40
Mounting Fixings ULTRASONIC INSERT, AULM IUA-M3-2 SI 1: $0.30 486In Stock 10,000Expected 2026/11/13	Mfr. Part No. IUA-M3-2 Mouser Part No 153-IUA-M3-2	SI	Mounting Fixings ULTRASONIC INSERT, AULM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	486In Stock 10,000Expected 2026/11/13	$0.30 $0.208 $0.167 $0.157 View $0.133 $0.127 $0.124 $0.12	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-632-1 SI 1: $0.24 1,102In Stock	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	1,102In Stock	$0.24 $0.166 $0.133 $0.126 View $0.106 $0.101 $0.099 $0.097	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-024-1 SI 1: $0.861 380In Stock	Mfr. Part No. IUC-024-1 Mouser Part No 153-IUC-024-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	380In Stock	$0.861 $0.64 $0.504 $0.427 View $0.412 $0.406	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.267 in	0.225 in	0.297 in	10-24
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-256-1 SI 1: $0.48 5,924In 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	5,924In Stock	$0.48 $0.34 $0.272 $0.245 View $0.228 $0.221 $0.209 $0.204 $0.197	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, STAINLESS STEEL .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-632-150 SI 1: $0.82 380In Stock	Mfr. Part No. IUTC-632-150 Mouser Part No 153-IUTC-632-150	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .150X.183 6-32 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	380In Stock	$0.82 $0.59 $0.471 $0.424 View $0.394 $0.383 $0.361 $0.354 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.189 in	0.15 in	0.21 in	6-32
Mounting Fixings ISC-M4 DBL ENDED NUT ISC-M4 SI 1: $1.00 230In Stock	Mfr. Part No. ISC-M4 Mouser Part No 153-ISC-M4	SI	Mounting Fixings ISC-M4 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	230In Stock	$1.00 $0.748 $0.583 $0.549 View $0.537 $0.519 $0.501 $0.483 $0.476	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	5.62 mm	8.15 mm	6.22 mm	M4
Mounting Fixings ISC-M5 DBL ENDED NUT ISC-M5 SI 1: $1.09 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	$1.09 $0.815 $0.634 $0.598 View $0.585 $0.565 $0.547 $0.526 $0.519	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, ALUM IUA-632-1 SI 1: $0.28 392In Stock	Mfr. Part No. IUA-632-1 Mouser Part No 153-IUA-632-1	SI	Mounting Fixings ULTRASONIC INSERT, ALUM Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	392In Stock	$0.28 $0.199 $0.159 $0.143 View $0.133 $0.129 $0.122 $0.119 $0.115	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	0.199 in	0.15 in	0.219 in	6-32
Mounting Fixings ULTRASONIC INSERT, ALUMINUM IUA-M2.5-2 SI 1: $0.39 885In 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	885In Stock	$0.39 $0.273 $0.219 $0.206 View $0.174 $0.167 $0.163 $0.158	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.58 mm	5.56 mm	4.37 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, AL IUA-M3-1 SI 1: $0.261 294In Stock 10,000Expected 2026/10/23	Mfr. Part No. IUA-M3-1 Mouser Part No 153-IUA-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, AL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	294In Stock 10,000Expected 2026/10/23	$0.261 $0.18 $0.144 $0.136 View $0.114 $0.109 $0.107 $0.104	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-0420-1 SI 1: $1.21 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	$1.21 $0.909 $0.707 $0.668 View $0.652 $0.63 $0.609 $0.587 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: $0.82 1,265In 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	1,265In Stock	$0.82 $0.576 $0.461 $0.434 View $0.368 $0.354 $0.345 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: $0.62 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	$0.62 $0.44 $0.354 $0.317 View $0.295 $0.287 $0.27 $0.264 $0.255	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, STAINLESS IUTC-M3.5 SI 1: $0.74 4,655In Stock 5,250Expected 2026/10/30	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 2026/10/30	$0.74 $0.521 $0.418 $0.393 View $0.333 $0.319 $0.312 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: $0.57 341In 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	341In Stock	$0.57 $0.411 $0.328 $0.295 View $0.274 $0.267 $0.251 $0.247 $0.238	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.81 mm	7.14 mm	6.35 mm	M3.5	Bulk
Mounting Fixings ISC-0420 DBL ENDED NUT ISC-0420 SI 1: $1.40 13,412In Stock	Mfr. Part No. ISC-0420 Mouser Part No 153-ISC-0420	SI	Mounting Fixings ISC-0420 DBL ENDED NUT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	13,412In Stock	$1.40 $1.04 $0.808 $0.761 View $0.744 $0.719 $0.694 $0.669 Quote	Min.: 1 Mult.: 1	Screws & Fasteners	Nut, Double Ended	Stainless Steel	0.315 in	0.5 in	0.338 in	1/4-20
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M8-2 SI 1: $2.61 1,160In Stock	Mfr. Part No. IUC-M8-2 Mouser Part No 153-IUC-M8-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,160In Stock	$2.61 $1.95 $1.52 $1.42 View $1.40 $1.34 $1.30 $1.26 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	10.19 mm	14.27 mm	11.91 mm	M8
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-024 SI 1: $1.09 1,487In Stock	Mfr. Part No. IUTC-024 Mouser Part No 153-IUTC-024	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,487In Stock	$1.09 $0.809 $0.63 $0.594 View $0.58 $0.561 $0.541 $0.522 $0.514	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.253 in	0.375 in	0.273 in	10-24
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-0518-1 SI 1: $2.58 915In Stock	Mfr. Part No. IUC-0518-1 Mouser Part No 153-IUC-0518-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	915In Stock	$2.58 $1.93 $1.50 $1.40 View $1.38 $1.33 $1.28 $1.24 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.431 in	0.335 in	0.469 in	5/16-18
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-0616-1 SI 1: $1.78 919In Stock	Mfr. Part No. IUB-0616-1 Mouser Part No 153-IUB-0616-1	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	919In Stock	$1.78 $1.33 $1.04 $0.969 View $0.948 $0.916 $0.885 $0.854 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.523 in	0.375 in	0.563 in	3/8-16
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-0616 SI 1: $1.78 1,644In Stock	Mfr. Part No. IUTC-0616 Mouser Part No 153-IUTC-0616	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	1,644In Stock	$1.78 $1.33 $1.04 $0.973 View $0.952 $0.92 $0.889 $0.856 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.468 in	0.5 in	0.509 in	3/8-16
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-0616-2 SI 1: $1.74 925In Stock	Mfr. Part No. IUB-0616-2 Mouser Part No 153-IUB-0616-2	SI	Mounting Fixings ULTRASONIC INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	925In Stock	$1.74 $1.30 $1.02 $0.952 View $0.932 $0.90 $0.869 $0.839 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	0.488 in	0.625 in	0.563 in	3/8-16
Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: $0.47 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	$0.47 $0.333 $0.267 $0.251 View $0.213 $0.204 $0.199 $0.192	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.18 mm		M2
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M2.5 SI 1: $0.39 33,757In Stock	Mfr. Part No. IUTB-M2.5 Mouser Part No 153-IUTB-M2.5	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	33,757In Stock	$0.39 $0.276 $0.221 $0.208 View $0.176 $0.167 $0.165 $0.159	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M2.5