Top Jaws | McMaster-Carr

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111 Products

Machinable Lathe Chuck Top Jaws

Machine these jaws to fit the curves and edges of your unique workpiece for a tighter hold and more stability than standard hardened jaws. For the tightest fit to your workpiece, use boring rings to hold your jaws in place while machining.

Pointed Jaws


Serrated Jaws	Tongue and Groove Jaws

Pointed jaws provide three points of contact on the workpiece. They are the most common choice for custom workholding.

Serrated Jaws—Serrated jaws work with most power lathe chucks from Kitagawa, LMC, Samchully, Toolmex, Bison, Seoam, and Auto Strong. Attach to your chuck with jaw nuts (not included).

Tongue and Groove Jaws— Tongue and groove jaws work with most manual lathe chucks from Bison, Toolmex, Buck, Samchully, Rohm, and Huron.

6061 Aluminum—6061 aluminum jaws are lighter in weight than steel jaws, so they can be turned at higher speeds with less wear on your machine.

1018 Low-Carbon Steel—1018 low-carbon steel jaws are more durable than aluminum. For repeated use, harden them after machining.

										6061 Aluminum			1018 Low-Carbon Steel
	For Lathe Chuck Dia.	Ht.	Lg.	Wd.	Slot Wd.	No. of Pieces	Serration Size	For Screw Size	Mounting Hole Ctr.-to-Ctr.	Wt., lb.		Each	Wt., lb.		Each
Serrated Jaws



		6"	1 1/2"	3"	1 1/4"	0.472"	3	1.5 mm × 60°	M10	0.787"	1.2	3235N11	000000	3.5	3235N124	000000


		6"	2"	3"	1 1/4"	0.472"	3	1.5 mm × 60°	M10	0.787"	1.8	3235N111	00000	4.7	3235N125	00000
		6"	3"	3"	1 1/4"	0.472"	3	1.5 mm × 60°	M10	0.787"	2.4	3235N112	00000	7.1	3235N126	000000
		8"	2"	4"	1 1/2"	0.551"	3	1.5 mm × 60°	M12	0.984"	3	3235N113	00000	8.1	3235N127	00000
		8"	3"	4"	1 1/2"	0.551"	3	1.5 mm × 60°	M12	0.984"	4.2	3235N114	00000	12.3	3235N128	000000
		8"	4"	4"	1 1/2"	0.551"	3	1.5 mm × 60°	M12	0.984"	5.7	3235N115	000000	16.2	3235N129	000000
		10"	2"	4 1/2"	1 1/2"	0.630"	3	1.5 mm × 60°	M12	1.181"	3.3	3235N116	00000	9.1	3235N13	00000
		10"	3"	4 1/2"	1 1/2"	0.630"	3	1.5 mm × 60°	M12	1.181"	4.8	3235N117	00000	13.8	3235N131	000000
		10"	4"	4 1/2"	1 1/2"	0.630"	3	1.5 mm × 60°	M12	1.181"	6.6	3235N118	000000	18.5	3235N132	000000
		12"	2"	5 1/2"	2"	0.827"	3	1.5 mm × 60°	M16	1.181"	5.4	3235N119	000000	15	3235N133	000000
		12"	3"	5 1/2"	2"	0.827"	3	1.5 mm × 60°	M16	1.181"	7.8	3235N12	000000	22.5	3235N134	000000


		12"	4"	5 1/2"	2"	0.827"	3	1.5 mm × 60°	M16	1.181"	10.5	3235N121	000000	30.3	3235N135	000000
		15"	3"	6 1/2"	2 1/2"	0.866"	3	1.5 mm × 60°	M20	1.693"	11.4	3235N122	000000	33.1	3235N136	000000
		15"	4"	6 1/2"	2 1/2"	0.866"	3	1.5 mm × 60°	M20	1.693"	15.3	3235N123	000000	45	3235N137	000000


		Tongue and Groove Jaws



				5"	1 1/2"	2 1/2"	1"	0.313"	3	—	M8	1.25"	0.9	3235N237	00000	2.7	3235N238	00000


				6"	1 1/2"	3"	1 1/4"	0.313"	3	—	M10	1.5"	1.5	3235N211	00000	3.6	3235N214	00000
				6"	2"	3"	1 1/4"	0.313"	3	—	M10	1.5"	1.8	3235N212	00000	4.8	3235N215	00000
				6"	3"	3"	1 1/4"	0.313"	3	—	M10	1.5"	2.7	3235N213	000000	7.2	3235N216	000000
				8"	2"	4"	1 1/2"	0.313"	3	—	M10	1.75"	3	3235N217	00000	8.1	3235N221	00000
				8"	3"	4"	1 1/2"	0.313"	3	—	M10	1.75"	4.5	3235N218	000000	12	3235N222	000000
				8"	4"	4"	1 1/2"	0.313"	3	—	M10	1.75"	5.7	3235N219	000000	16.2	3235N223	000000
				10"	2"	4 1/2"	1 1/2"	0.500"	3	—	M12	2.125"	3	3235N224	00000	9	3235N227	000000
				10"	3"	4 1/2"	1 1/2"	0.500"	3	—	M12	2.125"	4.8	3235N225	000000	12.9	3235N228	000000
				10"	4"	4 1/2"	1 1/2"	0.500"	3	—	M12	2.125"	6	3235N226	000000	18.3	3235N229	000000
				12"	2"	5 1/2"	2"	0.500"	3	—	M12	2.5"	5.4	3235N231	000000	15	3235N234	000000


				12"	3"	5 1/2"	2"	0.500"	3	—	M12	2.5"	8.1	3235N232	000000	22.5	3235N235	000000
				12"	4"	5 1/2"	2"	0.500"	3	—	M12	2.5"	10.5	3235N233	000000	30.3	3235N236	000000

Square Jaws


	Serrated Jaws

Square jaws have more contact with a workpiece than pointed jaws for a more secure grip. They’re lighter in weight than full-grip jaws, but their hold isn’t as tight.

Serrated Jaws—Serrated jaws work with most power lathe chucks from Kitagawa, LMC, Samchully, Toolmex, Bison, Seoam, and Auto Strong. Attach to your chuck with jaw nuts (not included).

6061 Aluminum—6061 aluminum jaws are lighter in weight than steel jaws, so they can be turned at higher speeds with less wear on your machine.

1018 Low-Carbon Steel—1018 low-carbon steel jaws are more durable than aluminum. For repeated use, harden them after machining.

										6061 Aluminum			1018 Low-Carbon Steel
	For Lathe Chuck Dia.	Ht.	Lg.	Wd.	Slot Wd.	No. of Pieces	Serration Size	For Screw Size	Mounting Hole Ctr.-to-Ctr.	Wt., lb.		Each	Wt., lb.		Each
Serrated Jaws



		6"	1 1/2"	3"	1 1/4"	0.473"	3	1.5 mm × 60°	M10	0.787"	1.5	3235N249	000000	3.9	3235N251	000000


		8"	2"	4"	1 1/2"	0.551"	3	1.5 mm × 60°	M12	0.984"	3	3235N252	00000	8.7	3235N253	00000
		10"	2"	4 1/2"	1 1/2"	0.630"	3	1.5 mm × 60°	M12	1.181"	3.6	3235N254	00000	9.9	3235N255	00000
		12"	2"	5 1/2"	2"	0.827"	3	1.5 mm × 60°	M16	1.181"	5.7	3235N256	000000	16.2	3235N257	000000

Full-Grip Jaws


	Serrated Jaws	Tongue and Groove Jaws

Full-grip jaws surround the workpiece for maximum grip from every angle, ensuring an exact fit on thin or intricate parts. This increased contact area reduces your risk of deforming parts with thin walls. They’re also known as pie jaws.

Serrated Jaws—Serrated jaws work with most power lathe chucks from Kitagawa, LMC, Samchully, Toolmex, Bison, Seoam, and Auto Strong. Attach to your chuck with jaw nuts (not included).

Tongue and Groove Jaws— Tongue and groove jaws work with most manual lathe chucks from Bison, Toolmex, Buck, Samchully, Rohm, and Huron.

6061 Aluminum—6061 aluminum jaws are lighter in weight than steel jaws, so they can be turned at higher speeds with less wear on your machine.

									6061 Aluminum
	For Lathe Chuck Dia.	Ht.	Dia.	Slot Wd.	No. of Pieces	Serration Size	For Screw Size	Mounting Hole Ctr.-to-Ctr.	Wt., lb.		Each
Serrated Jaws



		6"	2"	6"	0.472"	3	1.5 mm × 60°	M10	0.787"	5.7	3235N138	000000


		6"	3"	6"	0.472"	3	1.5 mm × 60°	M10	0.787"	8.1	3235N139	000000
		6"	4"	6"	0.472"	3	1.5 mm × 60°	M10	0.787"	10.8	3235N14	000000
		8"	2"	8"	0.551"	3	1.5 mm × 60°	M12	0.984"	10.2	3235N141	000000
		8"	3"	8"	0.551"	3	1.5 mm × 60°	M12	0.984"	14.7	3235N142	000000
		8"	4"	8"	0.551"	3	1.5 mm × 60°	M12	0.984"	19.8	3235N143	000000
		10"	2"	10"	0.630"	3	1.5 mm × 60°	M12	1.181"	16.2	3235N144	000000
		10"	3"	10"	0.630"	3	1.5 mm × 60°	M12	1.181"	24	3235N145	000000
		10"	4"	10"	0.630"	3	1.5 mm × 60°	M12	1.181"	31.5	3235N146	000000
		12"	2"	12"	0.827"	3	1.5 mm × 60°	M16	1.181"	23.4	3235N147	000000
		12"	3"	12"	0.827"	3	1.5 mm × 60°	M16	1.181"	34.2	3235N148	000000


		12"	4"	12"	0.827"	3	1.5 mm × 60°	M16	1.181"	45.3	3235N149	000000
		15"	3"	15"	0.866"	3	1.5 mm × 60°	M20	1.693"	53.7	3235N15	000000
		15"	4"	15"	0.866"	3	1.5 mm × 60°	M20	1.693"	70.8	3235N151	000000


		Tongue and Groove Jaws



				6"	2"	6"	0.313"	3	—	M8	1.25"	5.7	3235N239	000000


				6"	2"	6"	0.313"	3	—	M10	1.5"	5.7	3235N241	000000
				6"	4"	6"	0.313"	3	—	M10	1.5"	10.8	3235N242	000000
				8"	2"	8"	0.313"	3	—	M10	1.75"	10.2	3235N243	000000
				8"	4"	8"	0.313"	3	—	M10	1.75"	19.8	3235N244	000000
				10"	2"	10"	0.500"	3	—	M12	2.125"	16.2	3235N245	000000
				10"	4"	10"	0.500"	3	—	M12	2.125"	31.5	3235N246	000000
				12"	2"	12"	0.500"	3	—	M12	2.5"	23.4	3235N247	000000
				12"	4"	12"	0.500"	3	—	M12	2.5"	45.3	3235N248	000000

Hardened Lathe Chuck Jaws

Made from hardened steel, these jaws have a long service life even when performing heavy machining such as roughing cuts. Jaws are reversible and have teeth to grip a workpiece from its outside or inside. They fit most CNC lathe chucks made by Kitagawa, LMC, Samchully, Seoam, and Auto Strong. To ensure compatibility, match your chuck's diameter, slot width, serration type, and mounting-hole center-to-center distance. Attach to your chuck with jaw nuts (not included). Each set includes three jaws.

Reversible Jaws

					Step Height						Steel
For Lathe Chuck Dia.	Ht.	Lg.	Wd.	Slot Wd.	(A)	(B)	No. of Pieces	Serration Size	For Screw Size	Mounting Hole Ctr.-to-Ctr.	Wt., lb.		Each



	6"	2"	2.846"	1 1/4"	0.472"	1"	1 1/2"	3	1.5 mm × 60°	M10	0.787"	4.5	3229N11	0000000


	8"	2 1/2"	3.802"	1 1/2"	0.551"	1 1/4"	1 7/8"	3	1.5 mm × 60°	M12	1"	6.1	3229N12	000000
	10"	2 1/2"	4.352"	1 3/4"	0.63"	1 1/4"	1.937"	3	1.5 mm × 60°	M12	1.187"	9.1	3229N13	000000
	12"	2 3/4"	4.003"	2"	0.827"	1 1/4"	2"	3	1.5 mm × 60°	M16	1.181"	8.3	3229N14	00000000
	15"	2.94"	5.712"	2 1/2"	0.866"	1 5/8"	2.312"	3	1.5 mm × 60°	M20	1.693"	18.8	3229N15	00000000

Lathe Chuck Jaw Nuts

Secure jaws to a CNC lathe chuck with industry standard 1.5 mm × 60° serrations or wider 3 mm × 60° serrations.

Jaw Nuts with Metric Threads

Image of Product. Front orientation. Contains Annotated. Lathe Chuck Jaw Nuts.

M6 Threads, M8 Threads, M10 Threads, M12 Threads, M16 Threads, and M20 Threads—Jaw nuts with M6, M8, M10, M12, M16, and M20 threads fit most chucks made by Kitagawa, LMC, Samchully, Seoam, Auto Strong, and other brands.

M14 Threads—Jaw nuts with inch and M14 threads fit most chucks made by Matsumoto.

			Base
For Lathe Chuck Dia.	For Slot Wd.	Thread Size	Ht.	Lg.	Wd.	Overall Ht.	For Serration Size	Mounting Hole Ctr.-to-Ctr.	Material		Each
4"	0.315"	M6 × 1 mm	11/64"	61/64"	29/64"	17/32"	1.5 mm × 60°	0.591"	Steel	3228N21	000000
5"	0.392"	M8 × 1.25 mm	7/32"	1 11/64"	35/64"	39/64"	1.5 mm × 60°	0.713"	Steel	3228N22	00000
6"	0.472"	M10 × 1.5 mm	19/64"	1 13/32"	11/16"	23/32"	1.5 mm × 60°	0.787"	Steel	3228N11	00000
8"	0.551"	M12 × 1.75 mm	11/32"	1 27/32"	13/16"	13/16"	1.5 mm × 60°	0.984"	Steel	3228N12	00000
10"	0.63"	M12 × 1.75 mm	11/32"	1 63/64"	7/8"	27/32"	1.5 mm × 60°	1.181"	Steel	3228N13	00000
12"	0.705"	M14 × 2 mm	17/32"	2 3/16"	1 1/8"	1 11/64"	1.5 mm × 60°	1.26"	Steel	3228N27	00000
12"	0.827"	M16 × 2 mm	29/64"	2 9/16"	1 5/32"	1 3/32"	1.5 mm × 60°	1.181"	Steel	3228N14	00000
15"	0.866"	M20 × 2.5 mm	21/32"	3 5/32"	1 5/16"	1 51/64"	1.5 mm × 60°	1.693"	Steel	3228N15	00000
21", 24"	0.982"	M20 × 2.5 mm	11/16"	3 59/64"	1 7/16"	2 1/16"	3 mm × 60°	2.36"	Steel	3228N23	00000

Jaw Nuts with Inch Threads

Jaw nuts with inch and M14 threads fit most chucks made by Matsumoto.

			Base
For Lathe Chuck Dia.	For Slot Wd.	Thread Size	Ht.	Lg.	Wd.	Overall Ht.	For Serration Size	Mounting Hole Ctr.-to-Ctr.	Material		Each
6"	0.432"	5/16"-18	9/32"	1 9/16"	11/16"	25/32"	1.5 mm × 60°	0.984"	Steel	3228N24	000000
8"	0.551"	7/16"-14	21/64"	1 3/4"	51/64"	7/8"	1.5 mm × 60°	0.984"	Steel	3228N25	00000
10"	0.629"	1/2"-13	5/16"	2 3/64"	57/64"	57/64"	1.5 mm × 60°	1.26"	Steel	3228N26	00000
15"	0.865"	3/4"-10	49/64"	3 9/64"	1 21/64"	1 35/64"	3 mm × 60°	1.96"	Steel	3228N28	00000

Lathe Chuck Jaw Boring Rings

Standard Ring for Machining Outside-Grip Jaws

Adjustable Ring Installed for Machining Inside-Grip Jaws

Adjustable Ring Installed for Machining Outside-Grip Jaws

Hold machinable lathe chuck jaws in place during machining to make accurate cuts, ensuring the jaws will securely grip your workpiece. These boring rings pin the jaws down, creating the same clamping pressure you’ll use on your workpiece, which keeps the jaws from warping or deforming while they hold your workpiece.

Designed with an open center, these rings leave room for you to machine the center of your jaws. Fit the pins on the rings to the screw holes on your jaws, then clamp the jaws down to hold the ring in place. Once the ring is attached, rotate it to adjust the jaws to the center of their stroke before machining.

Standard Boring Ring—Match standard rings to your lathe chuck’s diameter for machining the center of your jaws. Line them up with your jaws by sliding the pins along their curved tracks.

Adjustable Boring Ring—Adjustable rings fit a range of lathe chuck diameters. The pins are mounted to straight tracks—slide them in and out of the ring to adjust the diameter. They are also reversible, which allows you to machine both the inside and outside of your jaws. When the pin screws are outside the ring, you can machine the center of your jaws. Flip them around to the center of the ring to machine the outside of your jaws.

						Pin
	For Lathe Chuck Dia.	For Jaw Gripping Location	OD	ID	Ht.	Dia.	Ht.	Max. Rotation Speed, rpm	Material		Each
Standard Boring Ring



		6"	Outside	6.6"	3.2"	0.47"	0.65"	0.354"	900	Alloy Steel	6886N113	0000000


		8"	Outside	8.6"	4 1/2"	0.47"	0.728"	0.354"	900	Alloy Steel	6886N114	000000
		10"	Outside	10.2"	5.9"	0.47"	0.728"	0.354"	900	Alloy Steel	6886N115	000000
		12"	Outside	12.4"	7.4"	0.59"	0.886"	0.354"	900	Alloy Steel	6886N116	000000
		15"	Outside	15"	9.1"	0.79"	1.22"	0.63"	900	Alloy Steel	6886N117	000000


		Adjustable Boring Ring



				5" to 8"	Inside, Outside	6.7"	3.9"	1.02"	0.512"	0.276"	800	Alloy Steel	6886N119	000000


				6" to 10"	Inside, Outside	7.9"	4.9"	1.02"	0.642"	0.315"	700	Alloy Steel	6886N121	000000
				8" to 12"	Inside, Outside	9.8"	6.3"	1.22"	0.72"	0.315"	600	Alloy Steel	6886N122	000000