Metal Acme Studs | McMaster-Carr

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Finish

Zinc Plated

System of Measurement

Thread Size

Length

Component

Nut Type

Thread Direction

Material

Thread Type

Threading

Travel Distance per Turn

Height

Fastener Strength Grade/Class

SAE Grade 2

Thread Fit

Acme Class 2G

Number of Thread Starts

Width

Tensile Strength

40,000 psi to 99,999 psi

Hardness

Specifications Met

REACH

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

RoHS

Speed Ratio

72 Products

Acme Lead Screws and Nuts

Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Lead Screws—Right-Hand Thread

Zinc-Plated Carbon Steel—Zinc-plated carbon steel components have mild corrosion resistance and are easier to machine than alloy steel components.

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

	Thread Type	Lg.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength, psi	Specs. Met		Each
Zinc-Plated Carbon Steel



	3/8"-8	Stub Acme	12"	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A730	000000


	3/8"-8	Stub Acme	3 ft.	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A420	00000
	3/8"-8	Stub Acme	6 ft.	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A240	00000
	1/2"-10	Acme	6"	1	1:1	0.1"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A431	00000
	1/2"-10	Acme	12"	1	1:1	0.1"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A735	00000
	1/2"-10	Acme	3 ft.	1	1:1	0.1"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A425	00000
	1/2"-10	Acme	6 ft.	1	1:1	0.1"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A250	00000
	5/8"-8	Acme	6"	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A441	00000
	5/8"-8	Acme	12"	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A740	00000
	5/8"-8	Acme	3 ft.	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A430	00000
	5/8"-8	Acme	6 ft.	1	1:1	0.125"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A260	00000


	3/4"-5	Acme	6"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A205	00000
	3/4"-5	Acme	12"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A745	00000
	3/4"-5	Acme	18"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A233	00000
	3/4"-5	Acme	3 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A435	00000
	3/4"-5	Acme	6 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A268	00000
	3/4"-6	Acme	6"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A451	00000
	3/4"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A750	00000
	3/4"-6	Acme	16"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A461	00000
	3/4"-6	Acme	18"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A463	00000
	3/4"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A440	00000


	3/4"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A270	00000
	1"-5	Acme	6"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A471	00000
	1"-5	Acme	10"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A475	00000
	1"-5	Acme	12"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A755	00000
	1"-5	Acme	18"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A505	00000
	1"-5	Acme	3 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A445	00000
	1"-5	Acme	6 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A280	00000
	1"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A760	00000
	1"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A450	00000
	1"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A282	00000


	1 1/4"-5	Acme	6"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A481	00000
	1 1/4"-5	Acme	12"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A487	00000
	1 1/4"-5	Acme	18"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A493	00000
	1 1/4"-5	Acme	3 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A455	00000
	1 1/4"-5	Acme	6 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A290	000000
	1 1/2"-4	Acme	6"	1	1:1	0.25"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A621	00000
	1 1/2"-4	Acme	12"	1	1:1	0.25"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A770	00000
	1 1/2"-4	Acme	18"	1	1:1	0.25"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	93255A649	000000
	1 1/2"-4	Acme	3 ft.	1	1:1	0.25"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A460	000000
	1 1/2"-4	Acme	6 ft.	1	1:1	0.25"	Acme Class 2G	SAE Grade 2	Rockwell B61	68,000	ASTM A108	98941A300	000000

Hex Nuts—Right-Hand Thread

Hex nuts fasten and position lead screw components.

Zinc-Plated Carbon Steel—Zinc-plated carbon steel components have mild corrosion resistance and are easier to machine than alloy steel components.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
Zinc-Plated Carbon Steel



	1/4"-16	Acme	15/64"	1/2"	1	1:1	0.063"	Acme Class 2G	Rockwell B75	Not Rated	98948A111	000000


	3/8"-8	Acme	23/64"	11/16"	1	1:1	0.125"	Acme Class 2G	Rockwell B75	Not Rated	98948A112	00000
	3/8"-10	Acme	23/64"	11/16"	1	1:1	0.1"	Acme Class 2G	Rockwell B75	Not Rated	98948A113	00000
	3/8"-12	Acme	23/64"	11/16"	1	1:1	0.083"	Acme Class 2G	Rockwell B75	Not Rated	98948A114	00000
	1/2"-8	Acme	31/64"	7/8"	1	1:1	0.125"	Acme Class 2G	Rockwell B75	Not Rated	98948A115	00000
	1/2"-10	Acme	1/2"	7/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B75	Not Rated	98948A730	00000
	5/8"-6	Acme	39/64"	1 1/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	98948A116	00000
	5/8"-8	Acme	5/8"	1 1/16"	1	1:1	0.125"	Acme Class 2G	Rockwell B75	Not Rated	98948A740	00000
	3/4"-5	Acme	47/64"	1 1/4"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A117	00000
	3/4"-6	Acme	3/4"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	98948A750	00000
	3/4"-8	Acme	47/64"	1 1/4"	1	1:1	0.125"	Acme Class 2G	Rockwell B75	Not Rated	98948A118	00000


	7/8"-6	Acme	55/64"	1 7/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	98948A119	00000
	1"-4	Acme	63/64"	1 5/8"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A121	00000
	1"-5	Acme	1"	1 5/8"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A770	00000
	1"-6	Acme	63/64"	1 5/8"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	98948A122	00000
	1"-8	Acme	63/64"	1 5/8"	1	1:1	0.125"	Acme Class 2G	Rockwell B75	Not Rated	98948A123	00000
	1"-10	Acme	63/64"	1 5/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B75	Not Rated	98948A124	00000
	1 1/8"-5	Acme	1 7/64"	1 13/16"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A125	00000
	1 1/4"-4	Acme	1 7/32"	2"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A126	00000
	1 1/4"-5	Acme	1 1/4"	2"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A820	00000
	1 3/8"-4	Acme	1 11/32"	2 3/16"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A127	00000


	1 1/2"-4	Acme	1 15/32"	2 3/8"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A128	00000
	1 1/2"-5	Acme	1 15/32"	2 3/8"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A129	00000
	2"-4	Acme	1 31/32"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A131	000000
	2 1/4"-4	Acme	2 1/2"	3 1/2"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A132	000000
	2 1/2"-4	Acme	2 1/2"	3 1/2"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	98948A133	000000

Hex Nuts—Left-Hand Thread

Hex nuts fasten and position lead screw components.

Zinc-Plated Carbon Steel—Zinc-plated carbon steel components have mild corrosion resistance and are easier to machine than alloy steel components.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
Zinc-Plated Carbon Steel



	1/2"-10	Acme	1/2"	7/8"	1	1:1	0.1"	Acme Class 2G	Rockwell B75	Not Rated	98948A130	000000


	5/8"-8	Acme	5/8"	1"	1	1:1	0.125"	Acme Class 2G	Rockwell B75	Not Rated	98948A140	00000
	3/4"-6	Acme	3/4"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	98948A150	00000
	1"-5	Acme	1"	1 5/8"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A170	00000
	1 1/4"-5	Acme	1 1/4"	2"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	98948A220	00000