Screws & Fasteners – Mouser Singapore

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RT™ Free-Running Locknuts

PEM RT™ Free-Running Locknuts feature all-metal construction and are resistant to vibrational loosening. These locknuts from PEM allow the screw to turn freely until a clamp load is applied, and the modified thread angle on the loaded flank provides a vibration-resistant locking feature. The back side of the panel is flush or sub-flush for screw installation, and the locking feature reusability is not affected by the number of on/off cycles.

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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	Thread Size	Length	Material	Plating	Screw Head
Screws & Fasteners S-M3-1ZI, RAMP THREAD S-RTM3-1ZI PEM 1: $0.299 9,441In Stock	Mfr. Part No. S-RTM3-1ZI Mouser Part No 153-S-RTM3-1ZI	PEM	Screws & Fasteners S-M3-1ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	9,441In Stock	$0.299 $0.223 $0.201 $0.175 View $0.16 $0.159 $0.133 $0.128	Min.: 1 Mult.: 1	Nuts	Self Clinching	M3 x 0.5	4.22 mm	Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-M6-00ZI, RAMP THREAD S-RTM6-00ZI PEM 1: $0.639 6,255In Stock	Mfr. Part No. S-RTM6-00ZI Mouser Part No 153-S-RTM6-00ZI	PEM	Screws & Fasteners S-M6-00ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	6,255In Stock	$0.639 $0.483 $0.438 $0.384 View $0.354 $0.333 $0.316 $0.306 $0.295	Min.: 1 Mult.: 1	Nuts	Self Clinching	M6 x 1		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-440-0ZI, RAMP THREAD S-RT440-0ZI PEM 1: $0.299 9,373In Stock	Mfr. Part No. S-RT440-0ZI Mouser Part No 153-S-RT440-0ZI	PEM	Screws & Fasteners S-440-0ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	9,373In Stock	$0.299 $0.227 $0.204 $0.175 View $0.16 $0.158 $0.132 $0.128	Min.: 1 Mult.: 1	Nuts	Self Clinching	4-40		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-M3-2ZI, RAMP THREAD S-RTM3-2ZI PEM 1: $0.299 8,926In Stock	Mfr. Part No. S-RTM3-2ZI Mouser Part No 153-S-RTM3-2ZI	PEM	Screws & Fasteners S-M3-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	8,926In Stock	$0.299 $0.227 $0.204 $0.175 View $0.16 $0.158 $0.132 $0.128	Min.: 1 Mult.: 1	Nuts	Self Clinching	M3 x 0.5	4.22 mm	Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners SS-RT032-2ZI PEM 1: $0.354 29In Stock	Mfr. Part No. SS-RT032-2ZI Mouser Part No 153-SS-RT032-2ZI	PEM	Screws & Fasteners Learn More about PEM rt free running locknuts	Datasheet	29In Stock	$0.354 $0.273 $0.248 $0.215 View $0.197 $0.185 $0.174 $0.165 $0.156	Min.: 1 Mult.: 1	Nuts	Self Clinching	10-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners SS-M5-0ZI, RAMP THREAD SS-RTM5-0ZI PEM 1: $0.354 92In Stock	Mfr. Part No. SS-RTM5-0ZI Mouser Part No 153-SS-RTM5-0ZI	PEM	Screws & Fasteners SS-M5-0ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	92In Stock	$0.354 $0.268 $0.242 $0.209 View $0.193 $0.181 $0.171 $0.162 $0.154	Min.: 1 Mult.: 1	Nuts	Self Clinching	M5 x 0.8		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-0420-0ZI, RAMP THREAD S-RT0420-0ZI PEM 1: $0.612 364In Stock	Mfr. Part No. S-RT0420-0ZI Mouser Part No 153-S-RT0420-0ZI	PEM	Screws & Fasteners S-0420-0ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	364In Stock	$0.612 $0.446 $0.405 $0.355 View $0.328 $0.326 $0.276 $0.272	Min.: 1 Mult.: 1	Nuts	Self Clinching	1/4-20		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-832-2ZI, RAMP THREAD S-RT832-2ZI PEM 1: $0.313 550In Stock	Mfr. Part No. S-RT832-2ZI Mouser Part No 153-S-RT832-2ZI	PEM	Screws & Fasteners S-832-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	550In Stock	$0.313 $0.226 $0.204 $0.178 View $0.163 $0.16 $0.136 $0.129	Min.: 1 Mult.: 1	Nuts	Self Clinching	8-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-M6-2ZI, RAMP THREAD S-RTM6-2ZI PEM 1: $0.653 1,085In Stock 10,000Expected 6/1/2027	Mfr. Part No. S-RTM6-2ZI Mouser Part No 153-S-RTM6-2ZI	PEM	Screws & Fasteners S-M6-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	1,085In Stock 10,000Expected 6/1/2027	$0.653 $0.488 $0.443 $0.389 View $0.358 $0.337 $0.316 $0.31 $0.298	Min.: 1 Mult.: 1	Nuts	Self Clinching	M6 x 1		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners SS-RT032-1ZI PEM 1: $0.354 997In Stock	Mfr. Part No. SS-RT032-1ZI Mouser Part No 153-SS-RT032-1ZI	PEM	Screws & Fasteners Learn More about PEM rt free running locknuts	Datasheet	997In Stock	$0.354 $0.269 $0.243 $0.212 View $0.194 $0.182 $0.173 $0.163 $0.155	Min.: 1 Mult.: 1	Nuts	Self Clinching	10-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners SS-M5-2ZI, RAMP THREAD SS-RTM5-2ZI PEM 1: $0.354 10,682In Stock	Mfr. Part No. SS-RTM5-2ZI Mouser Part No 153-SS-RTM5-2ZI	PEM	Screws & Fasteners SS-M5-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	10,682In Stock	$0.354 $0.256 $0.231 $0.201 View $0.185 $0.182 $0.154 $0.146	Min.: 1 Mult.: 1	Nuts	Self Clinching	M5 x 0.8		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-632-0ZI, RAMP THREAD S-RT632-0ZI PEM 1: $0.299 10,994In Stock	Mfr. Part No. S-RT632-0ZI Mouser Part No 153-S-RT632-0ZI	PEM	Screws & Fasteners S-632-0ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	10,994In Stock	$0.299 $0.224 $0.203 $0.177 View $0.162 $0.155 $0.139 $0.135 $0.128	Min.: 1 Mult.: 1	Nuts	Self Clinching	6-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-M6-1ZI, RAMP THREAD S-RTM6-1ZI PEM 1: $0.639 16,076In Stock	Mfr. Part No. S-RTM6-1ZI Mouser Part No 153-S-RTM6-1ZI	PEM	Screws & Fasteners S-M6-1ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	16,076In Stock	$0.639 $0.471 $0.427 $0.374 View $0.345 $0.326 $0.276	Min.: 1 Mult.: 1	Nuts	Self Clinching	M6 x 1		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-0518-1ZI, RAMP THREAD S-RT0518-1ZI PEM 1: $0.789 374In Stock	Mfr. Part No. S-RT0518-1ZI Mouser Part No 153-S-RT0518-1ZI	PEM	Screws & Fasteners S-0518-1ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	374In Stock	$0.789 $0.592 $0.537 $0.471 View $0.434 $0.409 $0.388 $0.375 $0.362	Min.: 1 Mult.: 1	Nuts	Self Clinching	5/16-18		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-0518-2ZI, RAMP THREAD S-RT0518-2ZI PEM 1: $0.789 2,461In Stock	Mfr. Part No. S-RT0518-2ZI Mouser Part No 153-S-RT0518-2ZI	PEM	Screws & Fasteners S-0518-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	2,461In Stock	$0.789 $0.592 $0.537 $0.471 View $0.434 $0.409 $0.388 $0.375 $0.362	Min.: 1 Mult.: 1	Nuts	Self Clinching	5/16-18		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-632-2ZI, RAMP THREAD S-RT632-2ZI PEM 1: $0.286 540In Stock	Mfr. Part No. S-RT632-2ZI Mouser Part No 153-S-RT632-2ZI	PEM	Screws & Fasteners S-632-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	540In Stock	$0.286 $0.223 $0.201 $0.175 View $0.16 $0.151 $0.143 $0.135 $0.128	Min.: 1 Mult.: 1	Nuts	Self Clinching	6-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-M4-0ZI, RAMP THREAD S-RTM4-0ZI PEM 1: $0.313 680In Stock	Mfr. Part No. S-RTM4-0ZI Mouser Part No 153-S-RTM4-0ZI	PEM	Screws & Fasteners S-M4-0ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	680In Stock	$0.313 $0.239 $0.216 $0.188 View $0.173 $0.162 $0.152 $0.144 $0.137	Min.: 1 Mult.: 1	Nuts	Self Clinching	M4 x 0.7		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-0420-2ZI, RAMP THREAD S-RT0420-2ZI PEM 1: $0.653 2In Stock	Mfr. Part No. S-RT0420-2ZI Mouser Part No 153-S-RT0420-2ZI	PEM	Screws & Fasteners S-0420-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	2In Stock	$0.653 $0.488 $0.443 $0.389 View $0.358 $0.337 $0.32 $0.31 $0.298	Min.: 1 Mult.: 1	Nuts	Self Clinching	1/4-20		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-RM4-2ZI, RAMP THREAD S-RTM4-2ZI PEM 1: $0.313 9,993Expected 25/11/2026	Mfr. Part No. S-RTM4-2ZI Mouser Part No 153-S-RTM4-2ZI	PEM	Screws & Fasteners S-RM4-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	9,993Expected 25/11/2026	$0.313 $0.226 $0.204 $0.177 View $0.163 $0.16 $0.135 $0.128	Min.: 1 Mult.: 1	Nuts	Self Clinching	M4 x 0.7		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-0420-1ZI, RAMP THREAD S-RT0420-1ZI PEM 10,000: $0.291 66,000Factory Stock Available	Mfr. Part No. S-RT0420-1ZI Mouser Part No 153-S-RT0420-1ZI	PEM	Screws & Fasteners S-0420-1ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	66,000Factory Stock Available More Info Available	$0.291	Min.: 10,000 Mult.: 1,000	Nuts	Self Clinching	1/4-20		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-440-1ZI, RAMP THREAD S-RT440-1ZI PEM 10,000: $0.128 24,950Factory Stock Available	Mfr. Part No. S-RT440-1ZI Mouser Part No 153-S-RT440-1ZI	PEM	Screws & Fasteners S-440-1ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	24,950Factory Stock Available More Info Available	$0.128	Min.: 10,000 Mult.: 1,000	Nuts	Self Clinching	4-40		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-832-1ZI, RAMP THREAD S-RT832-1ZI PEM 10,000: $0.137 14,920Factory Stock Available	Mfr. Part No. S-RT832-1ZI Mouser Part No 153-S-RT832-1ZI	PEM	Screws & Fasteners S-832-1ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	14,920Factory Stock Available More Info Available	$0.137	Min.: 10,000 Mult.: 1,000	Nuts	Self Clinching	8-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-M6-0ZI, RAMP THREAD S-RTM6-0ZI PEM 10,000: $0.291 13,155Factory Stock Available	Mfr. Part No. S-RTM6-0ZI Mouser Part No 153-S-RTM6-0ZI	PEM	Screws & Fasteners S-M6-0ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	13,155Factory Stock Available More Info Available	$0.291	Min.: 10,000 Mult.: 1,000	Nuts	Self Clinching	M6 x 1		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners SS-RT032-0ZI PEM 10,000: $0.156 93,000Factory Stock Available	Mfr. Part No. SS-RT032-0ZI Mouser Part No 153-SS-RT032-0ZI	PEM	Screws & Fasteners Learn More about PEM rt free running locknuts	Datasheet	93,000Factory Stock Available More Info Available	$0.156	Min.: 10,000 Mult.: 1,000	Nuts	Self Clinching	10-32		Carbon Steel	Zinc	Round, Knurled
Screws & Fasteners S-440-2ZI, RAMP THREAD S-RT440-2ZI PEM 10,000: $0.128 Non-Stocked Lead-Time 20 Weeks	Mfr. Part No. S-RT440-2ZI Mouser Part No 153-S-RT440-2ZI	PEM	Screws & Fasteners S-440-2ZI, RAMP THREAD Learn More about PEM rt free running locknuts	Datasheet	Non-Stocked Lead-Time 20 Weeks	$0.128	Min.: 10,000 Mult.: 1,000	Nuts	Self Clinching	4-40		Carbon Steel	Zinc	Round, Knurled

RT™ Free-Running Locknuts

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