Nonmetallic Precision Acme Nuts

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Travel Distance per Turn

Number of Thread Starts

Thread Direction

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Metric Rounded Trapezoidal

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Dynamic Thrust Load Capacity

Less than 250 lb.

250 lb. to 999 lb.

1,000 lb. to 1,999 lb.

2,000 lb. to 3,999 lb.

RoHS

Tensile Strength

REACH

Maximum Temperature

Minimum Temperature

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Hardness

Performance

External Thread Size

External Thread Length

External Thread Type

101 Products

Metric Ultra-Precision Lead Screws and Nuts


	Style A	Style B	Style C	Style D

Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won't unexpectedly move when the lead screw is at rest. To ensure compatibility, select components that have the same thread size, thread type, thread size, thread pitch, and number of thread starts.

Externally Threaded Nuts—Right-Hand Thread


Style A	Style B

Acetal—Acetal nuts have good wear and corrosion resistance.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

												External Thread
	Style	Thread Size	Lg.	Wd.	Ht.	Dia.	Hex Wd.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn, mm	Size	Lg.	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
Acetal



		A	M2 × 0.5 mm	11/16"	—	—	0.297"	7/16"	Metric Rounded Trapezoidal	1:1	1	0.5	3/8"-24	3/16"	Not Rated	8,000	10	-40 to 185	7549K58	000000


		A	M4 × 0.3 mm	11/16"	—	—	0.297"	7/16"	Metric Rounded Trapezoidal	1:1	1	0.3	3/8"-24	3/16"	Not Rated	8,000	25	-40 to 185	7549K59	00000
		A	M8 × 1.5 mm	1"	—	—	0.548"	11/16"	Metric Rounded Trapezoidal	1:1	1	1.5	5/8"-18	1/4"	Not Rated	8,000	75	-40 to 185	7549K61	00000


		PEEK



				B	M2 × 0.4 mm	5/16"	0.22"	0.197"	—	—	Metric Rounded Trapezoidal	1:1	1	0.375	M5 × 0.8 mm	9/64"	Durometer 83D	Not Rated	2	—	90500A220	00000


				B	M3 × 0.5 mm	13/32"	0.311"	0.276"	—	—	Metric Rounded Trapezoidal	1:1	1	0.5	M7 × 0.75 mm	5/32"	Durometer 83D	Not Rated	5	—	90500A230	00000
				B	M4 × 1 mm	1/2"	0.402"	0.354"	—	—	Metric Rounded Trapezoidal	1:1	1	1	M9 × 1 mm	13/64"	Durometer 83D	Not Rated	10	—	90500A240	00000

Flange Nuts—Right-Hand Thread


Style C	Style D

Style C

Style D

Acetal—Acetal nuts have good wear and corrosion resistance.

Wear-Compensating Internal O-Ring—Flange nuts with wear-compensating internal O-ring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

					Flange
	Style	Thread Size	Lg.	Dia.	Dia.	Wd.	Ht.	Thk.	Thread Type	Speed Ratio	Bolt Circle Dia.	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes	Temp., ° F		Each
Acetal



		C	M2 × 0.5 mm	1/2"	0.297"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	39/64"	1	0.5	Not Rated	8,000	10	2	-40 to 185	7549K62	000000


		C	M4 × 0.3 mm	1/2"	0.297"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	39/64"	1	0.3	Not Rated	8,000	25	2	-40 to 185	7549K63	00000
		D	M8 × 1.5 mm	3/4"	0.548"	1 1/8"	—	—	3/16"	Metric Rounded Trapezoidal	1:1	7/8"	1	1.5	Not Rated	8,000	75	3	-40 to 185	7549K64	00000


		PEEK



				C	M2 × 0.4 mm	9/32"	0.209"	—	15/32"	15/64"	5/64"	Metric Rounded Trapezoidal	1:1	11/32"	1	0.375	Durometer 83D	Not Rated	2	2	—	90500A250	00000


				C	M3 × 0.5 mm	21/64"	0.295"	—	39/64"	5/16"	3/32"	Metric Rounded Trapezoidal	1:1	15/32"	1	0.5	Durometer 83D	Not Rated	5	2	—	90500A260	00000
				C	M4 × 1 mm	13/32"	0.354"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	19/32"	1	1	Durometer 83D	Not Rated	10	2	—	90500A270	00000


				PEEK with Wear-Compensating Internal O-Ring



						C	M2 × 0.4 mm	5/16"	0.228"	—	15/32"	15/64"	5/64"	Metric Rounded Trapezoidal	1:1	11/32"	1	0.375	Durometer 83D	Not Rated	1	2	—	90500A280	000000


						C	M3 × 0.5 mm	25/64"	0.315"	—	39/64"	5/16"	3/32"	Metric Rounded Trapezoidal	1:1	15/32"	1	0.5	Durometer 83D	Not Rated	2	2	—	90500A290	000000
						C	M4 × 1 mm	31/64"	0.406"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	19/32"	1	1	Durometer 83D	Not Rated	5	2	—	90500A310	000000

Precision Acme Lead Screws and Nuts

Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Round Nuts—Right-Hand Thread

PET—PET plastic nuts are lightweight and corrosion resistant.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
PET



	3/8"-8	3/4"	1.344"	Acme	1:1	1	0.125"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K134	000000


	3/8"-10	3/4"	1.344"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K138	00000
	3/8"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K149	00000
	3/8"-16	3/4"	1.344"	Acme	1:1	1	0.063"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K39	00000
	1/2"-10	1"	1.465"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	1349K141	00000
	5/8"-5	1 1/4"	1.859"	Acme	1:1	1	0.2"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	1349K23	00000
	5/8"-8	1 1/4"	1.859"	Acme	1:1	1	0.125"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	1349K136	00000
	5/8"-10	1 1/4"	1.859"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	1349K143	00000
	3/4"-5	1 1/2"	2.234"	Acme	1:1	1	0.2"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	1349K121	000000
	3/4"-6	1 1/2"	2.234"	Acme	1:1	1	0.167"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	1349K129	000000
	3/4"-10	1 1/2"	2.234"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	1349K145	000000

Round Nuts—Left-Hand Thread

PET—PET plastic nuts are lightweight and corrosion resistant.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
PET



	3/8"-8	3/4"	1.344"	Acme	1:1	1	0.125"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K135	000000


	3/8"-10	3/4"	1.344"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K139	00000
	3/8"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K151	00000
	1/2"-10	1"	1.465"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	1349K142	00000
	5/8"-8	1 1/4"	1.859"	Acme	1:1	1	0.125"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	1349K137	00000
	5/8"-10	1 1/4"	1.859"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	1349K144	00000
	3/4"-5	1 1/2"	2.234"	Acme	1:1	1	0.2"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	1349K122	000000
	3/4"-6	1 1/2"	2.234"	Acme	1:1	1	0.167"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	1349K131	000000
	3/4"-10	1 1/2"	2.234"	Acme	1:1	1	0.1"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	1349K146	000000

Externally Threaded Nuts—Right-Hand Thread

Image of Product. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Precision Acme Lead Screws and Nuts, Externally Threaded Nuts—Right-Hand Thread.

Combine externally threaded nuts with a flange to create a custom flange nut.

PET—PET plastic nuts are lightweight and corrosion resistant.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

								External Thread
	Thread Size	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
PET



		1/4"-16	5/8"	0.688"	Acme	1:1	1	0.063"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	160	15 to 175	95075A210	000000


		1/4"-20	5/8"	0.688"	Acme	1:1	1	0.05"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	160	15 to 175	95075A340	00000
		3/8"-8	5/8"	0.688"	Acme	1:1	1	0.125"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A224	00000
		3/8"-10	5/8"	0.688"	Acme	1:1	1	0.1"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A227	00000
		3/8"-12	5/8"	0.688"	Acme	1:1	1	0.083"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A104	00000
		3/8"-16	5/8"	0.688"	Acme	1:1	1	0.063"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A229	00000
		1/2"-10	3/4"	1.125"	Acme	1:1	1	0.1"	15/16"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	95075A106	00000
		5/8"-8	1"	1.125"	Acme	1:1	1	0.125"	15/16"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	95075A109	00000
		5/8"-10	1"	1.125"	Acme	1:1	1	0.1"	15/16"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	1,000	15 to 175	95075A249	00000
		3/4"-5	1 1/4"	1.125"	Acme	1:1	1	0.2"	1"-18	1/2"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	95075A112	00000
		3/4"-6	1 1/4"	1.125"	Acme	1:1	1	0.167"	1"-18	1/2"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	95075A113	00000


		3/4"-10	1 1/4"	1.125"	Acme	1:1	1	0.1"	1"-18	1/2"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	95075A114	00000
		1"-4	1 1/2"	1.5"	Acme	1:1	1	0.25"	1 3/8"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	2,500	15 to 175	95075A118	00000
		1"-5	1 1/2"	1.5"	Acme	1:1	1	0.2"	1 3/8"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	2,500	15 to 175	95075A119	00000
		1"-6	1 1/2"	1.5"	Acme	1:1	1	0.167"	1 3/8"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	2,500	15 to 175	95075A120	00000
		1"-10	1 1/2"	1.5"	Acme	1:1	1	0.1"	1 3/8"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	2,500	15 to 175	95075A121	00000
		1 1/4"-5	1 3/4"	2.125"	Acme	1:1	1	0.2"	1 31/32"-18	13/16"	Acme Class 2C	Not Rated	Not Rated	3,900	15 to 175	95075A218	00000
		1 1/2"-4	2 19/64"	2.125"	Acme	1:1	1	0.25"	1 31/32"-18	13/16"	Acme Class 2C	Not Rated	Not Rated	6,000	15 to 175	95075A219	000000
		2"-4	3 15/32"	2.75"	Acme	1:1	1	0.25"	2 35/64"-18	7/8"	Acme Class 2C	Not Rated	Not Rated	10,000	15 to 175	95075A222	000000

Flanges

Image of Attribute. Front orientation. Contains Annotated.

Thread onto an externally threaded acme nut to create a custom flange nut.

1117 Carbon Steel—Carbon steel flanges have good machinability. However, they will rust when exposed to moisture.

Black-Oxide 1117 Carbon Steel—Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color.

1215 Carbon Steel—Carbon steel flanges have good machinability. However, they will rust when exposed to moisture.

303 Stainless Steel—303 stainless steel flanges have good corrosion resistance.

	Flange Dia.	Flange Thk.	Bolt Circle Dia.	Flange Hardness		Each
1117 Carbon Steel



	1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 156	95082A644	000000


	1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 156	95082A645	00000
	2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 156	95082A646	00000


	Black-Oxide 1117 Carbon Steel



			9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 135	1329K101	00000


			15/16"-16	2 39/64"	17/32"	2 3/32"	Brinell 135	1329K102	00000
			1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 135	1329K104	00000
			1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 135	1329K105	00000


			1215 Carbon Steel



					9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	95082A641	00000


					15/16"-16	2 5/8"	17/32"	2 3/32"	Not Rated	95082A642	00000


					303 Stainless Steel



							9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	1329K11	00000


							15/16"-16	2 5/8"	17/32"	2 3/32"	Brinell 140	1329K12	00000
							1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 140	1329K14	00000
							1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 140	1329K15	000000
							2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 140	1329K16	000000

Fast-Travel Precision Acme Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. The threads have a tight thread fit for accurate, repeatable starts and stops. Pair with a motor in automated motion and positioning applications. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Round Nuts—Right-Hand Thread

PET—PET plastic nuts are lightweight and corrosion resistant.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
PET



	1/4"-12	3/4"	1.344"	Acme	4:1	4	0.333"	Acme Class 2C	Not Rated	Not Rated	160	15 to 175	1349K105	000000


	3/8"-8	3/4"	1.344"	Acme	2:1	2	0.25"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K107	00000
	3/8"-8	3/4"	1.344"	Acme	4:1	4	0.5"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K101	00000
	3/8"-10	3/4"	1.344"	Acme	2:1	2	0.2"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K118	00000
	1/2"-8	1"	1.469"	Acme	2:1	2	0.25"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	1349K15	00000
	1/2"-10	1"	1.469"	Acme	2:1	2	0.2"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	1349K22	00000
	1/2"-10	1"	1.469"	Acme	5:1	5	0.5"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	1349K103	00000

Externally Threaded Nuts—Right-Hand Thread

Image of Product. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel Precision Acme Lead Screws and Nuts, Externally Threaded Nuts—Right-Hand Thread.

Combine externally threaded nuts with a flange to create a custom flange nut.

PET—PET plastic nuts are lightweight and corrosion resistant.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

								External Thread
	Thread Size	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
PET



		1/4"-12	5/8"	0.688"	Acme	4:1	4	0.333"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	160	15 to 175	95075A207	000000


		3/8"-5	5/8"	0.688"	Acme	5:1	5	1"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	250	15 to 175	95075A101	00000
		3/8"-8	5/8"	0.688"	Acme	2:1	2	0.25"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A226	00000
		3/8"-8	5/8"	0.688"	Acme	4:1	4	0.5"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A225	00000
		3/8"-10	5/8"	0.688"	Acme	2:1	2	0.2"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A228	00000
		1/2"-8	3/4"	1.125"	Acme	2:1	2	0.25"	15/16"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	95075A105	00000
		1/2"-10	3/4"	1.125"	Acme	2:1	2	0.2"	15/16"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	95075A247	00000
		1/2"-10	3/4"	1.125"	Acme	5:1	5	0.5"	15/16"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	650	15 to 175	95075A245	00000
		3/4"-8	1 1/4"	1.125"	Acme	4:1	4	0.5"	1"-18	1/2"	Acme Class 2C	Not Rated	Not Rated	1,450	15 to 175	95075A230	00000
		1"-4	1 1/2"	1.5"	Acme	2:1	2	0.5"	1 3/8"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	2,500	15 to 175	95075A260	00000

Flanges

Thread onto an externally threaded acme nut to create a custom flange nut.

1117 Carbon Steel—Carbon steel flanges have good machinability. However, they will rust when exposed to moisture.

1215 Carbon Steel—Carbon steel flanges have good machinability. However, they will rust when exposed to moisture.

303 Stainless Steel—303 stainless steel flanges have good corrosion resistance.

	Flange Dia.	Flange Thk.	Bolt Circle Dia.	Flange Hardness		Each
1117 Carbon Steel



	1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 156	95082A644	000000


	1215 Carbon Steel



			9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	95082A641	00000


			15/16"-16	2 5/8"	17/32"	2 3/32"	Not Rated	95082A642	00000
			1"-18	2 5/8"	17/32"	2 3/32"	Not Rated	95082A643	00000


			303 Stainless Steel



					9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	1329K11	00000


					15/16"-16	2 5/8"	17/32"	2 3/32"	Brinell 140	1329K12	00000
					1"-18	2 5/8"	17/32"	2 3/32"	Brinell 140	1329K13	00000
					1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 140	1329K14	00000

Fast-Travel Ultra-Precision Lead Screws and Nuts


	Style A

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.

Flange Nuts—Right-Hand Thread

Style A

Acetal—Acetal nuts have good wear and corrosion resistance.

Wear-Compensating Internal O-Ring—Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

					Flange
	Style	Thread Size	Lg.	Dia.	Wd.	Ht.	Thk.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Mounting Hole Ctr.-to-Ctr.	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes		Each
Acetal



		A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.096"	39/64"	Not Rated	Not Rated	25	2	6642K23	000000


		A	5/32"-21.3	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.094"	39/64"	Not Rated	Not Rated	25	2	6642K25	00000
		A	3/16"-42.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	16:1	16	0.375"	39/64"	Not Rated	Not Rated	25	2	6642K57	00000
		A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	4:1	4	0.192"	39/64"	Not Rated	Not Rated	25	2	6642K26	00000


		Acetal with Wear-Compensating Internal O-Ring



				A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.096"	39/64"	Not Rated	Not Rated	5	2	6642K33	00000


				A	5/32"-21.3	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.094"	39/64"	Not Rated	Not Rated	5	2	6642K35	00000
				A	3/16"-42.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	16:1	16	0.375"	39/64"	Not Rated	Not Rated	5	2	6642K67	00000
				A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	4:1	4	0.192"	39/64"	Not Rated	Not Rated	5	2	6642K36	00000

Ultra-Precision Lead Screws and Nuts


	Style A

Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.

Flange Nuts—Right-Hand Thread

Style A

Acetal—Acetal nuts have good wear and corrosion resistance.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

					Flange
	Style	Thread Size	Lg.	Dia.	Wd.	Ht.	Thk.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Mounting Hole Ctr.-to-Ctr.	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes		Each
Acetal



		A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	25	2	6642K22	000000


		A	9/64"-41.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.024"	39/64"	Not Rated	Not Rated	25	2	6642K21	00000
		A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	25	2	6642K24	00000


		Acetal with Wear-Compensating Internal O-Ring



				A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	5	2	6642K32	00000


				A	9/64"-41.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.024"	39/64"	Not Rated	Not Rated	5	2	6642K31	00000
				A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	5	2	6642K34	00000