Mounting Fixings – Mouser Singapore

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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 (SGD) 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 ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: $0.354 187,778In 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	187,778In Stock 12,674On Order	$0.354 $0.242 $0.194 $0.182 View $0.154 $0.148 $0.144 $0.14	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-832 SI 1: $0.503 13,090In 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	13,090In Stock	$0.503 $0.354 $0.283 $0.267 View $0.226 $0.216 $0.211 $0.204	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: $1.44 5,335In Stock 10,000Expected 2/11/2026	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	5,335In Stock 10,000Expected 2/11/2026	$1.44 $1.08 $0.839 $0.792 View $0.774 $0.748 $0.722 $0.696 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: $1.65 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	$1.65 $1.22 $0.962 $0.816 View $0.787 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: $1.10 8,586In 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	8,586In Stock	$1.10 $0.782 $0.627 $0.59 View $0.50 $0.479 $0.469 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	3.43 mm	4.55 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-632-2 SI 1: $0.898 6,833In 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	6,833In Stock	$0.898 $0.631 $0.506 $0.456 View $0.422 $0.411 $0.386 $0.378 Quote	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: $0.503 60,228In 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	60,228In Stock	$0.503 $0.358 $0.286 $0.257 View $0.239 $0.233 $0.219 $0.215 $0.207	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 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: $0.558 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	$0.558 $0.396 $0.317 $0.284 View $0.264 $0.257 $0.242 $0.237 $0.228	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings ULTRASONIC,INSERT,STAINLESS IUCC-M5-2 SI 1: $1.36 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	$1.36 $1.01 $0.787 $0.741 View $0.725 $0.70 $0.676 $0.651 $0.642	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	7.06 mm	11.1 mm	8.33 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M2-318 SI 1: $0.734 9,951In 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	9,951In Stock	$0.734 $0.518 $0.415 $0.373 View $0.345 $0.336 $0.317 $0.31 $0.299	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	3.18 mm	3.73 mm	M2
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: $0.87 9,560In 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	9,560In Stock	$0.87 $0.616 $0.494 $0.445 View $0.412 $0.40 $0.377 $0.369 Quote	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: $0.952 10,254In 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	10,254In Stock	$0.952 $0.669 $0.536 $0.483 View $0.447 $0.435 $0.409 $0.401 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: $1.80 9,083In 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	9,083In Stock	$1.80 $1.33 $1.04 $0.976 View $0.953 $0.922 $0.891 $0.858 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: $1.28 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	$1.28 $0.90 $0.721 $0.65 View $0.602 $0.585 $0.552 $0.54 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: $0.639 11,005In 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	11,005In Stock	$0.639 $0.453 $0.363 $0.326 View $0.295 $0.294 $0.277 $0.271 $0.261	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: $1.17 10,328In 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	10,328In Stock	$1.17 $0.83 $0.665 $0.598 View $0.555 $0.539 $0.509 $0.496 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M2.5
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M3 SI 1: $1.16 36,897In 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	36,897In Stock	$1.16 $0.824 $0.66 $0.594 View $0.551 $0.536 $0.506 $0.495 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: $1.50 3,711In 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	3,711In Stock 10,000Expected 17/11/2026	$1.50 $1.12 $0.876 $0.826 View $0.808 $0.781 $0.753 $0.726 Quote	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: $1.26 6,901In 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	6,901In Stock	$1.26 $0.945 $0.736 $0.694 View $0.679 $0.656 $0.632 $0.611 $0.601	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: $0.299 23,744In Stock 25,000Expected 12/2/2027	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	23,744In Stock 25,000Expected 12/2/2027	$0.299 $0.216 $0.173 $0.156 View $0.144 $0.14 $0.133 $0.129 $0.125	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-M2 SI 1: $0.626 14,912In Stock	Mfr. Part No. IUTB-M2 Mouser Part No 153-IUTB-M2	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14,912In Stock	$0.626 $0.452 $0.362 $0.325 View $0.302 $0.294 $0.277 $0.271 $0.261	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M4-470 SI 1: $0.666 9,866In Stock	Mfr. Part No. IUTB-M4-470 Mouser Part No 153-IUTB-M4-470	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 4.70X5.51 M4 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,866In Stock	$0.666 $0.465 $0.373 $0.351 View $0.296 $0.284 $0.277 $0.268	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	4.7 mm		M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: $0.816 29,191In Stock 11,000Expected 10/11/2026	Mfr. Part No. IUTFB-M4 Mouser Part No 153-IUTFB-M4	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	29,191In Stock 11,000Expected 10/11/2026	$0.816 $0.583 $0.466 $0.42 View $0.39 $0.379 $0.358 $0.35 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	7.14 mm	M4
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-1 SI 1: $0.653 9,642In Stock	Mfr. Part No. IUC-M3-1 Mouser Part No 153-IUC-M3-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,642In Stock	$0.653 $0.466 $0.374 $0.336 View $0.313 $0.303 $0.286 $0.28 $0.271	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.89 mm	3.43 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: $0.707 20,472In Stock 88,141On 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	20,472In Stock 88,141On Order On Order Ship Dates Mfr. No: IUC-M3-2 Stock: 20,472 Can Dispatch Immediately On Order: 26,141 Pending 62,000 Expected 10/11/2026 Factory Lead Time: 19 Weeks	$0.707 $0.505 $0.404 $0.363 View $0.337 $0.328 $0.309 $0.302 $0.292	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.58 mm	5.56 mm	4.37 mm	M3