Left-Handed Dies | McMaster-Carr

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146 Products

Left-Hand Screw Thread Dies

Cut left-hand external threads on bolts, studs, and rods. These dies are shaped for use with a die wrench. Loosen and tighten the die with the included set screw to adjust thread depth.

Carbon steel dies are for use on most metal and plastic. High-speed steel dies last longer than carbon steel when cutting similar material.

For technical drawings and 3-D models, click on a part number.

		Carbon Steel		High-Speed Steel
Thread Size	Includes		Each		Each
UNC Left-Hand Thread
13/16" OD
6-32	Set Screw	0000000	000000	0000000	000000
8-32	Set Screw	0000000	00000	0000000	00000
10-24	Set Screw	0000000	00000	0000000	00000
1/4"-20	Set Screw	0000000	00000	0000000	00000
5/16"-18	Set Screw	0000000	00000	000000	00
3/8"-16	Set Screw	000000	00	0000000	00000
1" OD
6-32	Set Screw	0000000	00000	0000000	00000
8-32	Set Screw	0000000	00000	0000000	00000
10-24	Set Screw	0000000	00000	0000000	00000
1/4"-20	Set Screw	0000000	00000	0000000	00000
5/16"-18	Set Screw	000000	00	0000000	00000
3/8"-16	Set Screw	0000000	00000	0000000	00000
1/2"-13	Set Screw	0000000	00000	000000	00
1 1/2" OD
1/4"-20	Set Screw	0000000	00000	0000000	00000
5/16"-18	Set Screw	0000000	00000	000000	00
3/8"-16	Set Screw	0000000	00000	0000000	00000
7/16"-14	Set Screw	0000000	00000	0000000	00000
1/2"-13	Set Screw	0000000	00000	0000000	00000
5/8"-11	Set Screw	0000000	00000	0000000	00000
3/4"-10	Set Screw	000000	00	0000000	00000
2" OD
5/8"-11	Set Screw	0000000	00000	0000000	00000
3/4"-10	Set Screw	0000000	00000	0000000	00000
1"-8	Set Screw	000000	00	0000000	00000
UNF Left-Hand Thread
13/16" OD
10-32	Set Screw	0000000	00000	0000000	00000
1/4"-28	Set Screw	0000000	00000	0000000	00000
5/16"-24	Set Screw	0000000	00000	000000	00
3/8"-24	Set Screw	000000	00	0000000	00000
1" OD
10-32	Set Screw	0000000	00000	0000000	00000
1/4"-28	Set Screw	000000	00	0000000	00000
5/16"-24	Set Screw	0000000	00000	0000000	00000
3/8"-24	Set Screw	0000000	00000	0000000	00000
1/2"-20	Set Screw	0000000	00000	000000	00
1 1/2" OD
1/4"-28	Set Screw	0000000	00000	0000000	00000
5/16"-24	Set Screw	0000000	00000	000000	00
3/8"-24	Set Screw	0000000	00000	0000000	00000
7/16"-20	Set Screw	0000000	00000	0000000	00000
1/2"-20	Set Screw	0000000	00000	0000000	00000
9/16"-18	Set Screw	000000	00	0000000	00000
5/8"-18	Set Screw	0000000	00000	0000000	00000
3/4"-16	Set Screw	000000	00	0000000	00000
2" OD
5/8"-18	Set Screw	0000000	00000	0000000	00000
3/4"-16	Set Screw	0000000	00000	0000000	00000

			High-Speed Steel
Thread Size	Thread Pitch, mm	Includes		Each
Metric Left-Hand Thread
1" OD
M5	0.8	Set Screw	0000000	000000
M6	1	Set Screw	0000000	00000
M8	1.25	Set Screw	0000000	00000
M10	1.5	Set Screw	0000000	00000
M12	1.75	Set Screw	0000000	00000
1 1/2" OD
M10	1.5	Set Screw	0000000	00000
M12	1.75	Set Screw	0000000	00000
M14	2	Set Screw	0000000	00000
M16	2	Set Screw	0000000	00000
M18	1.5	Set Screw	0000000	00000
M18	2.5	Set Screw	0000000	00000
M20	2.5	Set Screw	0000000	00000

Ridgid Dies for Cutting Pipe and Conduit Threads in Steel

Use these dies with Ridgid pipe and conduit threader die heads on Ridgid pipe and conduit threaders. High-speed steel dies last longer than alloy steel dies when used to cut similar material.

				High-Speed Steel
For Pipe Size	For Threads per Inch	For Pipe Threader Model Number	Number of Pieces		Each
For NPT Left-Hand Thread
For Die Head Models 0-R, 00-R, 11-R, 111-R, 12-R, 30-A, 31-A
1/4	18	00-R, 11-R, 12-R, 700	4	00000000	000000
3/8	18	00-R, 11-R, 12-R, 700	4	00000000	00000
1/2	14	00-R, 11-R, 12-R, 700	4	00000000	000000
3/4	14	00-R, 11-R, 12-R, 700	4	00000000	000000
1	11 1/2	00-R, 11-R, 12-R, 700	4	00000000	000000
1 1/4	11 1/2	00-R, 11-R, 12-R, 700	4	00000000	000000
1 1/2	11 1/2	00-R, 11-R, 12-R, 700	4	00000000	000000
2	11 1/2	00-R, 11-R, 12-R, 700	4	00000000	000000

Left-Hand Thread Repairing Dies

Repair rusted and damaged left-hand screw threads. These dies are hex shaped for use with conventional wrenches.

For technical drawings and 3-D models, click on a part number.

UNC Left-Hand Thread
Thread Size	Wd.	Material		Each
1/4"-20	19/32"	Carbon Steel	0000000	00000
5/16"-18	11/16"	Carbon Steel	0000000	0000
7/16"-14	7/8"	Carbon Steel	0000000	00000
1/2"-13	1 1/16"	Carbon Steel	0000000	00000
9/16"-12	1 1/16"	Carbon Steel	0000000	00000
5/8"-11	1 1/4"	Carbon Steel	0000000	00000
3/4"-10	1 7/16"	Carbon Steel	0000000	00000
7/8"-9	1 5/8"	Carbon Steel	0000000	00000
1"-8	1 13/16"	Carbon Steel	0000000	00000
1 1/8"-7	2"	Carbon Steel	0000000	00000
1 1/4"-7	2 3/16"	Carbon Steel	0000000	00000
1 3/8"-6	2 3/8"	Carbon Steel	0000000	00000
1 1/2"-6	2 9/16"	Carbon Steel	0000000	000000
UNF Left-Hand Thread
1/4"-28	19/32"	Carbon Steel	0000000	0000
5/16"-24	11/16"	Carbon Steel	0000000	0000
3/8"-24	25/32"	Carbon Steel	0000000	00000
7/16"-20	7/8"	Carbon Steel	0000000	00000
1/2"-20	1 1/16"	Carbon Steel	0000000	00000
9/16"-18	1 1/16"	Carbon Steel	0000000	00000
5/8"-18	1 1/4"	Carbon Steel	0000000	00000
3/4"-16	1 7/16"	Carbon Steel	0000000	00000
7/8"-14	1 5/8"	Carbon Steel	0000000	00000
1"-12	1 13/16"	Carbon Steel	0000000	00000
1 1/8"-12	2"	Carbon Steel	0000000	00000
1 1/4"-12	2 3/16"	Carbon Steel	0000000	00000
1 3/8"-12	2 3/8"	Carbon Steel	0000000	00000
1 1/2"-12	2 9/16"	Carbon Steel	0000000	000000
UNS Left-Hand Thread
11/16"-11	1 7/16"	Carbon Steel	0000000	00000
11/16"-16	1 7/16"	Carbon Steel	0000000	00000
1"-14	1 13/16"	Carbon Steel	0000000	00000

Metric Left-Hand Thread
Thread Size	Thread Pitch, mm	Wd.	Material		Each
M6	1	11/16"	Carbon Steel	00000000	000000
M8	1.25	11/16"	Carbon Steel	00000000	00000
M10	1.25	7/8"	Carbon Steel	00000000	00000
M10	1.5	7/8"	Carbon Steel	00000000	00000
M12	1.5	1 1/16"	Carbon Steel	00000000	00000
M12	1.75	1 1/16"	Carbon Steel	00000000	00000
M14	1.5	1 1/16"	Carbon Steel	00000000	00000
M14	2	1 1/16"	Carbon Steel	00000000	00000
M16	1.5	1 1/4"	Carbon Steel	00000000	00000
M16	2	1 1/4"	Carbon Steel	00000000	00000

Left-Hand Thread Repairing Dies for Tight Spots

With a smaller width than regular hex dies, these dies are suitable for repairing rusted and damaged left-hand threads in tight spaces. They're hex shaped for use with conventional wrenches.

For technical drawings and 3-D models, click on a part number.

UNC Left-Hand Thread
Thread Size	Wd.	Material		Each
1/4"-20	7/16"	Carbon Steel	00000000	00000
5/16"-18	1/2"	Carbon Steel	00000000	0000
3/8"-16	9/16"	Carbon Steel	00000000	0000
7/16"-14	11/16"	Carbon Steel	00000000	0000
1/2"-13	3/4"	Carbon Steel	00000000	0000
9/16"-12	7/8"	Carbon Steel	00000000	0000
5/8"-11	15/16"	Carbon Steel	00000000	0000
UNF Left-Hand Thread
1/4"-28	7/16"	Carbon Steel	00000000	0000
5/16"-24	1/2"	Carbon Steel	00000000	0000
3/8"-24	9/16"	Carbon Steel	00000000	0000
7/16"-20	11/16"	Carbon Steel	00000000	0000
1/2"-20	3/4"	Carbon Steel	00000000	0000
9/16"-18	7/8"	Carbon Steel	00000000	0000
5/8"-18	15/16"	Carbon Steel	00000000	0000

Thread Repairing Die Sets

Repair rusted or damaged external threads in a variety of sizes. These dies are hex shaped for use with conventional wrenches.

Plastic Pouch
Number of Pieces	Thread Direction	Die Sizes Included		Each
Carbon Steel
7	Left Hand	1/4"-20 (7/16" Wd.), 5/16"-18 (1/2" Wd.), 3/8"-16 (9/16" Wd.), 7/16"-14 (11/16" Wd.), 1/2"-13 (3/4" Wd.), 9/16"-12 (7/8" Wd.), 5/8"-11 (15/16" Wd.)	0000000	000000
7	Left Hand	1/4"-28 (7/16" Wd.), 5/16"-24 (1/2" Wd.), 3/8"-24 (9/16" Wd.), 7/16"-20 (11/16" Wd.), 1/2"-20 (3/4" Wd.), 9/16"-18 (7/8" Wd.), 5/8"-18 (15/16" Wd.)	0000000	00000