Mounting Fixings – Mouser Hong Kong

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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 (HKD) 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, STAINLESS IUTC-0420 SI 1: HK$9.95 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	HK$9.95 HK$7.38 HK$5.81 HK$4.93 View HK$4.76 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: HK$6.66 8,756In 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	8,756In Stock	HK$6.66 HK$4.73 HK$3.79 HK$3.57 View HK$3.02 HK$2.89 HK$2.84 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	3.43 mm	4.55 mm	M3
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-1 SI 1: HK$1.81 33,198In Stock	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	33,198In Stock	HK$1.81 HK$1.31 HK$1.04 HK$0.945 View HK$0.871 HK$0.847 HK$0.806 HK$0.781 HK$0.756	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-832 SI 1: HK$3.04 13,267In 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	13,267In Stock	HK$3.04 HK$2.14 HK$1.71 HK$1.61 View HK$1.36 HK$1.31 HK$1.27 HK$1.23	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-632 SI 1: HK$6.49 8,305In Stock	Mfr. Part No. IUTC-632 Mouser Part No 153-IUTC-632	SI	Mounting Fixings HI-TORQUE INSERT, STAINLESS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,305In Stock	HK$6.49 HK$4.56 HK$3.66 HK$3.44 View HK$2.92 HK$2.79 HK$2.74 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	0.189 in	0.281 in	0.21 in	6-32
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M4 SI 1: HK$8.71 8,335In Stock	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	8,335In Stock	HK$8.71 HK$6.52 HK$5.07 HK$4.78 View HK$4.68 HK$4.52 HK$4.36 HK$4.21 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, BRASS 3.43X3.86 M3 THREAD ULTRASONIC HEAT STAKING DIAGONAL IUTB-M3-343 SI 1: HK$3.37 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	HK$3.37 HK$2.39 HK$1.92 HK$1.72 View HK$1.59 HK$1.55 HK$1.46 HK$1.43 HK$1.38	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	3.43 mm		M3
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M6 SI 1: HK$6.66 7,358In Stock	Mfr. Part No. IUTB-M6 Mouser Part No 153-IUTB-M6	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	7,358In Stock	HK$6.66 HK$4.73 HK$3.79 HK$3.57 View HK$3.02 HK$2.89 HK$2.84 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	8.03 mm	12.7 mm	8.69 mm	M6
Mounting Fixings ULTRASONIC,INSERT,STAINLESS IUCC-M5-2 SI 1: HK$8.22 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	HK$8.22 HK$6.11 HK$4.76 HK$4.48 View HK$4.38 HK$4.23 HK$4.09 HK$3.94 HK$3.88	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: HK$4.44 10,451In 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	10,451In Stock	HK$4.44 HK$3.13 HK$2.51 HK$2.25 View HK$2.09 HK$2.03 HK$1.92 HK$1.87 HK$1.81	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-632-2 SI 1: HK$5.43 8,408In 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	8,408In Stock	HK$5.43 HK$3.81 HK$3.06 HK$2.75 View HK$2.55 HK$2.48 HK$2.33 HK$2.29 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: HK$3.04 64,005In 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	64,005In Stock	HK$3.04 HK$2.16 HK$1.73 HK$1.55 View HK$1.45 HK$1.41 HK$1.32 HK$1.30 HK$1.25	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings ULTRASONIC INSERT, STAINLESS IUC-M2.5-1 SI 1: HK$5.75 10,444In 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	10,444In Stock	HK$5.75 HK$4.04 HK$3.24 HK$2.92 View HK$2.70 HK$2.63 HK$2.47 HK$2.42 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: HK$10.85 9,133In 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	9,133In Stock	HK$10.85 HK$8.04 HK$6.26 HK$5.90 View HK$5.76 HK$5.57 HK$5.38 HK$5.19 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: HK$7.73 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	HK$7.73 HK$5.44 HK$4.36 HK$3.93 View HK$3.64 HK$3.53 HK$3.34 HK$3.26 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.43 mm	9.53 mm	7.92 mm	M5
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M2.5 SI 1: HK$7.07 10,935In 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	10,935In Stock	HK$7.07 HK$5.01 HK$4.02 HK$3.62 View HK$3.35 HK$3.26 HK$3.07 HK$3.00 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	4.01 mm	5.74 mm	4.55 mm	M2.5
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M5-2 SI 1: HK$4.85 9,710In 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	9,710In Stock	HK$4.85 HK$3.42 HK$2.74 HK$2.58 View HK$2.19 HK$2.09 HK$2.05 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	6.25 mm	9.53 mm	7.54 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTB-M2 SI 1: HK$3.78 16,327In 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	16,327In Stock	HK$3.78 HK$2.73 HK$2.19 HK$1.96 View HK$1.82 HK$1.78 HK$1.68 HK$1.64 HK$1.58	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	4 mm	3.73 mm	M2
Mounting Fixings HI-TORQUE INSERT IUTA-M3 SI 1: HK$2.63 14,310In Stock 17,000Expected 21/12/2026	Mfr. Part No. IUTA-M3 Mouser Part No 153-IUTA-M3	SI	Mounting Fixings HI-TORQUE INSERT Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	14,310In Stock 17,000Expected 21/12/2026	HK$2.63 HK$1.89 HK$1.51 HK$1.36 View HK$1.27 HK$1.23 HK$1.16 HK$1.13 HK$1.09	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Aluminum	4.01 mm	5.74 mm	4.55 mm	M3
Mounting Fixings HI-TORQUE INSERT, STAINLESS IUTC-M3 SI 1: HK$6.99 39,067In 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	39,067In Stock	HK$6.99 HK$4.98 HK$3.99 HK$3.59 View HK$3.33 HK$3.24 HK$3.06 HK$2.99 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: HK$9.04 4,596In 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	4,596In Stock 10,000Expected 17/11/2026	HK$9.04 HK$6.80 HK$5.29 HK$4.99 View HK$4.88 HK$4.72 HK$4.55 HK$4.39 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: HK$7.64 7,646In 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	7,646In Stock	HK$7.64 HK$5.71 HK$4.45 HK$4.19 View HK$4.10 HK$3.96 HK$3.82 HK$3.69 HK$3.63	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Stainless Steel	6.43 mm	9.52 mm	6.93 mm	M5
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M2 SI 1: HK$3.95 8,794In Stock 10,000Expected 12/2/2027	Mfr. Part No. IUTFB-M2 Mouser Part No 153-IUTFB-M2	SI	Mounting Fixings HI-TORQUE INSERT, BRASS Learn More about SI standard inserts ultrasonic heat staking inserts	Datasheet	8,794In Stock 10,000Expected 12/2/2027	HK$3.95 HK$2.84 HK$2.27 HK$2.05 View HK$1.90 HK$1.84 HK$1.74 HK$1.70 HK$1.64	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.23 mm	3.99 mm	4.75 mm	M2	Bulk
Mounting Fixings HI-TORQUE INSERT, BRASS IUTFB-M4 SI 1: HK$4.93 9,211In Stock 31,000On Order	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	9,211In Stock 31,000On Order On Order Ship Dates Mfr. No: IUTFB-M4 Stock: 9,211 Can Dispatch Immediately On Order: 20,000 Expected 12/10/2026 11,000 Expected 4/1/2027 Factory Lead Time: 24 Weeks	HK$4.93 HK$3.53 HK$2.82 HK$2.54 View HK$2.36 HK$2.29 HK$2.16 HK$2.11 Quote	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	5.67 mm	8.15 mm	7.14 mm	M4
Mounting Fixings ULTRASONIC INSERT, BRASS IUB-M3-2 SI 1: HK$2.14 146,425In Stock 87,041On 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	146,425In Stock 87,041On Order On Order Ship Dates Mfr. No: IUB-M3-2 Stock: 146,425 Can Dispatch Immediately On Order: 12,674 Pending 74,367 Expected 20/10/2026 Factory Lead Time: 18 Weeks	HK$2.14 HK$1.46 HK$1.18 HK$1.10 View HK$0.929 HK$0.896 HK$0.871 HK$0.847	Min.: 1 Mult.: 1	Inserts	Threaded Insert	Brass	3.58 mm	5.56 mm	4.37 mm	M3