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Standard Round Dies

National Coarse Thread Adjustable Round Split Dies

High Speed Steel. For cutting external threads.
Adjustment screw allows die to be set for different classes of fit.
Can be used to cut new threads or clean up existing threads.
Pitches not found in the listings for National Coarse or National Fine are listed as Special Pitch Dies.

Follow this link to see the corresponding Taps for these Dies.

Follow this link to explore our complete offering of taps, dies, and other threading tools.
Quantity Price Model Description Size Threads Per Inch O.D.

$6.60 RD-1-64-A
#1-64 HS 13/16" OD Die #1 64 13/16"

$6.60 RD-2-56-A
#2-56 HS 13/16" OD Die #2 56 13/16"

$6.60 RD-3-48-A
#3-48 HS 13/16" OD Die #3 48 13/16"

$6.60 RD-4-40-A
#4-40 HS 13/16" OD Die #4 40 13/16"

$6.60 RD-5-40-A
#5-40 HS 13/16" OD Die #5 40 13/16"

$6.60 RD-6-32-A
#6-32 HS 13/16" OD Die #6 32 13/16"

$6.60 RD-8-32-A
#8-32 HS 13/16" OD Die #8 32 13/16"

$6.60 RD-10-24-A
#10-24 HS 13/16" OD Die #10 24 13/16"

$6.60 RD-12-24-A
#12-24 HS 13/16" OD Die #12 24 13/16"

$7.50 RD-1-64-B
#1-64 HS Die, 1" OD #1 64 1"

$7.50 RD-2-56-B
#2-56 HS Die, 1" OD #2 56 1"

$7.50 RD-3-48-B
#3-48 HS Die, 1" OD #3 48 1"

$7.50 RD-4-40-B
#4-40 HS Die, 1" OD #4 40 1"

$7.50 RD-5-40-B
#5-40 HS Die, 1" OD #5 40 1"

$7.50 RD-6-32-B
#6-32 HS Die, 1" OD #6 32 1"

$7.50 RD-8-32-B
#8-32 HS Die, 1" OD #8 32 1"

$7.50 RD-10-24-B
#10-24 HS Die, 1" OD #10 24 1"

$7.50 RD-12-24-B
#12-24 HS Die, 1" OD #12 24 1"

$7.50 RD-1/4-20-B
1/4"-20 HS Die, 1" OD 1/4" 20 1"

$7.50 RD-5/16-18-B
5/16"-18 HS Die, 1" OD 5/16" 18 1"

$7.50 RD-3/8-16-B
3/8"-16 HS Die, 1" OD 3/8" 16 1"

$7.50 RD-7/16-14-B
7/16"-14 HS Die, 1" OD 7/16" 14 1"

$7.50 RD-1/2-13-B
1/2"-13 HS Die, 1" OD 1/2" 13 1"

$12.60 RD-1/4-20-C
1/4"-20 HS Die, 1-1/2" OD 1/4" 20 1 1/2"

$12.60 RD-5/16-18-C
5/16"-18 HS Die, 1-1/2" OD 5/16" 18 1 1/2"

$12.60 RD-3/8-16-C
3/8"-16 HS Die, 1-1/2" OD 3/8" 16 1 1/2"

$12.60 RD-7/16-14-C
7/16"-14 HS Die, 1-1/2" OD 7/16" 14 1 1/2"

$12.60 RD-1/2-13-C
1/2"-13 HS Die, 1-1/2" OD 1/2" 13 1 1/2"

$12.60 RD-9/16-12-C
9/16"-12 HS Die, 1-1/2" OD 9/16" 12 1 1/2"

$12.60 RD-5/8-11-C
5/8"-11 HS Die, 1-1/2" OD 5/8" 11 1 1/2"

$12.60 RD-3/4-10-C
3/4"-10 HS Die, 1-1/2" OD 3/4" 10 1 1/2"

$22.20 RD-1/4-20-D
1/4"-20 HS Die, 2" OD 1/4" 20 2"

$22.20 RD-5/16-18-D
5/16"-18 HS Die, 2" OD 5/16" 18 2"

$22.20 RD-3/8-16-D
3/8"-16 HS Die, 2" OD 3/8" 16 2"

$22.20 RD-7/16-14-D
7/16"-14 HS Die, 2" OD 7/16" 14 2"

$22.20 RD-1/2-13-D
1/2"-13 HS Die, 2" OD 1/2" 13 2"

$22.20 RD-9/16-12-D
9/16"-12 HS Die, 2" OD 9/16" 12 2"

$22.20 RD-5/8-11-D
5/8"-11 HS Die, 2" OD 5/8" 11 2"

$22.20 RD-3/4-10-D
3/4"-10 HS Die, 2" OD 3/4" 10 2"

$22.20 RD-7/8-9-D
7/8"-9 HS Die, 2" OD 7/8" 9 2"

$22.20 RD-1-8-D
1"-8 HS Die, 2" OD 1" 8 2"

$42.50 RD-1-1/8-7-E
1 1/8"-7 HS Die, 2-1/2" OD 1 1/8" 7 2 1/2"

$42.50 RD-1-1/4-7-E
1 1/4"-7 HS Die, 2-1/2" OD 1 1/4" 7 2 1/2"

$42.50 RD-1-3/8-6-E
1 3/8"-6 HS Die, 2-1/2" OD 1 3/8" 6 2 1/2"

$42.50 RD-1-1/2-6-E
1 1/2"-6 HS Die, 2-1/2" OD 1 1/2" 6 2 1/2"

National Fine Adjustable Round Split Dies

High Speed Steel. For cutting external threads.
Adjustment screw allows die to be set for different classes of fit.
Can be used to cut new threads or clean up existing threads.
Pitches not found in the listings for National Coarse or National Fine are listed as Special Pitch Dies.

Follow this link to see the corresponding Taps for these Dies.

Follow this link to explore our complete offering of taps, dies, and other threading tools.
Quantity Price Model Description Size Threads Per Inch O.D.

$6.60 RD-0-80-A
#0-80 HS Die, 13/16" OD #0 80 13/16"

$6.60 RD-1-72-A
#1-72 HS Die, 13/16" OD #1 72 13/16"

$6.60 RD-2-64-A
#2-64 HS Die, 13/16" OD #2 64 13/16"

$6.60 RD-3-56-A
#3-56 HS Die, 13/16" OD #3 56 13/16"

$6.60 RD-4-48-A
#4-48 HS Die, 13/16" OD #4 48 13/16"

$6.60 RD-5-44-A
#5-44 HS Die, 13/16" OD #5 44 13/16"

$6.60 RD-6-40-A
#6-40 HS Die, 13/16" OD #6 40 13/16"

$6.60 RD-8-36-A
#8-36 HS Die, 13/16" OD #8 36 13/16"

$6.60 RD-10-32-A
#10-32 HS Die, 13/16" OD #10 32 13/16"

$6.60 RD-12-28-A
#12-28 HS Die, 13/16" OD #12 28 13/16"

$7.50 RD-0-80-B
#0-80 HS Die, 1" OD #0 80 1"

$7.50 RD-1-72-B
#1-72 HS Die, 1" OD #1 72 1"

$7.50 RD-2-64-B
#2-64 HS Die, 1" OD #2 64 1"

$7.50 RD-3-56-B
#3-56 HS Die, 1" OD #3 56 1"

$7.50 RD-4-48-B
#4-48 HS Die, 1" OD #4 48 1"

$7.50 RD-5-44-B
#5-44 HS Die, 1" OD #5 44 1"

$7.50 RD-6-40-B
#6-40 HS Die, 1" OD #6 40 1"

$7.50 RD-8-36-B
#8 36- HS Die, 1" OD #8 36 1"

$7.50 RD-10-32-B
#10-32 HS Die, 1" OD #10 32 1"

$7.50 RD-12-28-B
#12-28 HS Die, 1" OD #12 28 1"

$7.50 RD-1/4-28-B
1/4"-28 HS Die, 1" OD 1/4" 28 1"

$7.50 RD-5/16-24-B
5/16"-24 HS Die, 1" OD 5/16" 24 1"

$7.50 RD-3/8-24-B
3/8"-24 HS Die, 1" OD 3/8" 24 1"

$7.50 RD-7/16-20-B
7/16"-20 HS Die, 1" OD 7/16" 20 1"

$7.50 RD-1/2-20-B
1/2"-20 HS Die, 1" OD 1/2" 20 1"

$12.60 RD-1/4-28-C
1/4"-28 HS Die, 1-1/2" OD 1/4" 28 1 1/2"

$12.60 RD-5/16-24-C
5/16"-24 HS Die, 1-1/2" OD 5/16" 24 1 1/2"

$12.60 RD-3/8-24-C
3/8"-24 HS Die, 1-1/2" OD 3/8" 24 1 1/2"

$12.60 RD-7/16-20-C
7/16"-20 HS Die, 1-1/2" OD 7/16" 20 1 1/2"

$12.60 RD-1/2-20-C
1/2"-20 HS Die, 1-1/2" OD 1/2" 20 1 1/2"

$12.60 RD-9/16-18-C
9/16"-18 HS Die, 1-1/2" OD 9/16" 18 1 1/2"

$12.60 RD-5/8-18-C
5/8"-18 HS Die, 1-1/2" OD 5/8" 18 1 1/2"

$12.60 RD-3/4-16-C
3/4"-16" HS Die, 1-1/2" OD 3/4" 16 1 1/2"

$22.20 RD-1/4-28-D
1/4"-28 HS Die, 2" OD 1/4" 28 2"

$22.20 RD-5/16-24-D
5/16"-24 HS Die, 2" OD 5/16" 24 2"

$22.20 RD-3/8-24-D
3/8"-24 HS Die, 2" OD 3/8" 24 2"

$22.20 RD-7/16-20-D
7/16"-20 HS Die, 2" OD 7/16" 20 2"

$22.20 RD-1/2-20-D
1/2"-20 HS Die, 2" OD 1/2" 20 2"

$22.20 RD-9/16-18-D
9/16"-18 HS Die, 2" OD 9/16" 18 2"

$22.20 RD-5/8-18-D
5/8"-18 HS Die, 2" OD 5/8" 18 2"

$22.20 RD-3/4-16-D
3/4"-16" HS Die, 2" OD 3/4" 16 2"

$22.20 RD-7/8-14-D
7/8"-14 HS Die, 2" OD 7/8" 14 2"

$22.20 RD-1-14-D
1"-14 HS Die, 2" OD 1" 14 2"

$42.50 RD-1-14-E
1"-14 HS Die, 2-1/2" OD (limited quantity) 1" 14 2 1/2"

$42.50 RD-1-1/8-12-E
1 1/8"-12 HS Die, 2-1/2" OD 1 1/8" 12 2 1/2"

$42.50 RD-1-1/4-12-E
1 1/4"-12 HS Die, 2-1/2" OD 1 1/4" 12 2 1/2"

$42.50 RD-1-3/8-12-E
1 3/8"-12 HS Die, 2-1/2" OD 1 3/8" 12 2 1/2"

$42.50 RD-1-1/2-12-E
1 1/2"-12 HS Die, 2-1/2" OD 1 1/2" 12 2 1/2"