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 ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: $0.261 187,070In 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	187,070In Stock 12,674On Order	$0.261 $0.178 $0.143 $0.134 View $0.113 $0.109 $0.106 $0.104	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M3-2 SI 1: $0.52 92,488In Stock 16,125On 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	92,488In Stock 16,125On Order	$0.52 $0.371 $0.297 $0.267 View $0.248 $0.241 $0.227 $0.222 $0.215	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 3.18X3.07 M2 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M2-318 SI 1: $0.47 9,541In 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	9,541In 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 Fixings HI-TORQUE INSERT, STAINLESS IUTC-0420 SI 1: $1.21 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	$1.21 $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 Fixings HI-TORQUE INSERT, STAINLESS STEEL 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-M3-343 SI 1: $0.811 8,125In 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	8,125In Stock	$0.811 $0.576 $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 Fixings HI-TORQUE INSERT, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: $0.411 13,385In 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	13,385In Stock	$0.411 $0.291 $0.233 $0.209 View $0.194 $0.19 $0.178 $0.174 $0.167	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-632-2 SI 1: $0.661 6,058In 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	6,058In Stock	$0.661 $0.464 $0.372 $0.335 View $0.311 $0.302 $0.284 $0.278 $0.269	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: $0.37 56,763In 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	56,763In Stock	$0.37 $0.263 $0.211 $0.19 View $0.176 $0.171 $0.16 $0.158 $0.152	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-M2.5 SI 1: $0.861 10,302In 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	10,302In Stock	$0.861 $0.611 $0.49 $0.44 View $0.408 $0.397 $0.374 $0.365 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, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M5-572 SI 1: $0.561 10,291In Stock	Mfr. Part No. IUTB-M5-572 Mouser Part No 153-IUTB-M5-572	SI	Mounting Fixings HI-TORQUE INSERT, BRASS 5.72X6.27 M5 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	10,291In Stock	$0.561 $0.397 $0.317 $0.286 View $0.266 $0.258 $0.244 $0.238 $0.23	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	5.72 mm		M5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: $0.64 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	$0.64 $0.454 $0.363 $0.327 View $0.304 $0.294 $0.277 $0.271 $0.262	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: $0.70 10,154In 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	10,154In Stock	$0.70 $0.492 $0.394 $0.355 View $0.329 $0.32 $0.301 $0.295 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, BRASS IUTB-832 SI 1: $0.37 13,030In 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	13,030In Stock	$0.37 $0.261 $0.208 $0.197 View $0.166 $0.159 $0.155 $0.15	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 STEEL .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTC-440-135 SI 1: $0.62 9,296In Stock	Mfr. Part No. IUTC-440-135 Mouser Part No 153-IUTC-440-135	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS STEEL .135X.152 4-40 THREAD ULTRASONIC HEAT STAKING DIAGONAL Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,296In Stock	$0.62 $0.436 $0.349 $0.329 View $0.279 $0.267 $0.261 $0.252	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.158 in	0.135 in	0.179 in	4-40
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M6 SI 1: $1.33 8,953In 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	8,953In Stock	$1.33 $0.978 $0.762 $0.718 View $0.701 $0.678 $0.655 $0.632 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: $0.94 9,727In 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	9,727In 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 Fixings ULTRASONIC,INSERT,STAINLESS IUCC-M5-2 SI 1: $1.00 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	$1.00 $0.743 $0.579 $0.545 View $0.533 $0.515 $0.497 $0.479 $0.472	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: $0.54 9,923In 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	9,923In Stock	$0.54 $0.381 $0.305 $0.274 View $0.254 $0.247 $0.233 $0.228 $0.22	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	3.23 mm	3.18 mm	3.73 mm	M2
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-440-2 SI 1: $0.53 8,695In Stock	Mfr. Part No. IUC-440-2 Mouser Part No 153-IUC-440-2	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,695In 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 Fixings HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: $1.06 4,495In Stock 10,000Expected 2027/03/05	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	4,495In Stock 10,000Expected 2027/03/05	$1.06 $0.793 $0.618 $0.583 View $0.569 $0.55 $0.531 $0.512 $0.505	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.67 mm	8.15 mm	6.17 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: $0.60 37,933In Stock	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	37,933In Stock	$0.60 $0.429 $0.343 $0.309 View $0.287 $0.279 $0.263 $0.257 $0.248	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: $0.48 9,506In 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	9,506In Stock	$0.48 $0.343 $0.276 $0.247 View $0.23 $0.223 $0.211 $0.206 $0.199	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-M4-1 SI 1: $0.60 9,492In Stock	Mfr. Part No. IUC-M4-1 Mouser Part No 153-IUC-M4-1	SI	Mounting Fixings ULTRASONIC INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	9,492In Stock	$0.60 $0.426 $0.341 $0.321 View $0.272 $0.261 $0.255 $0.247	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	5.74 mm	4.7 mm	6.35 mm	M4
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M4 SI 1: $0.511 10,918In Stock 10,000Expected 2026/12/01	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	10,918In Stock 10,000Expected 2026/12/01	$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 ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: $0.22 20,334In Stock 52,000On Order	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	20,334In Stock 52,000On Order On Order Ship Dates Mfr. No: IUB-M3-1 Stock: 20,334 Can Dispatch Immediately On Order: 25,000 Expected 2027/02/12 27,000 Expected 2027/03/12 Factory Lead Time: 17 Weeks	$0.22 $0.159 $0.127 $0.115 View $0.106 $0.104 $0.098 $0.095 $0.092	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.89 mm	3.43 mm	4.37 mm	M3