Dies

A high-quality, reliable threading tool is essential for workshops and industrial businesses that require threads measured to an exact metric thread size, which will give the pitch of the thread in millimetres (mm). At RS Components, we have thread dies made from both standard steel and high-speed steel (HSS) available, meaning there is a choice of material to best suit your requirements. Our available products cover a range of metric sizes and pitches.


What is a thread die and what are they used for?


Thread dies are special tools used in the manufacturing industry to create the threads on screws, bolts, nuts and other male fixing items. Over time, threads can become damaged and may need rethreading, which dies can also be used for. There are cavities to remove chips and debris as the thread is cut, however, it is recommended to use a chaser for cleaning debris from threads as dies will remove additional material each time they are used on a male thread. This will cause the locking of male and female portions to weaken.


In order to ensure proper alignment during threading, die stocks are often used to hold the die in place and ensure the threading is uniform. The diameter of a die stock can be adjusted slightly to allow for different sized round and hex dies and are tightened to fit the chosen die.


What types of thread die are there?


The external shape of the thread die can be round, square, hexagon or tubular and can be further classified as solid, split or separable. Round dies are the most common and, depending on their size, have three or more serrated cutting edges and geometrically represent the nut thread. There are also left-hand thread dies for applications in which a right-hand thread would cause the male portion to loosen, such as the left-hand pedal on a bicycle.


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Description Price Thread Size Pitch Outside Diameter Thickness Material Left Hand Thread
RS Stock No. 668-0740
BrandRS PRO
TWD549.00
Each
units
3/8-24 UNF - 25.4mm 9mm HSS -
RS Stock No. 509-0193
Mfr. Part No.04411
BrandEXACT
TWD436.00
Each
units
1/4-28 - 20mm 7mm HSS -
RS Stock No. 509-0121
Mfr. Part No.04314
BrandEXACT
TWD713.00
Each
units
1/2-13 - 38mm 14mm HSS -
RS Stock No. 205-2306
BrandRS PRO
TWD2,790.00
Each
units
1/4 in BSPT - - - Steel -
RS Stock No. 509-0064
Mfr. Part No.70416
BrandEVENTUS
TWD214.00
Each
units
M12 1.75mm 25mm 9mm HSS -
RS Stock No. 668-0731
BrandRS PRO
TWD619.00
Each
units
M8 1.25mm 25mm 9mm HSS -
RS Stock No. 668-0747
BrandRS PRO
TWD480.00
Each
units
1/4-28 UNF - 25.4mm 9mm HSS -
RS Stock No. 215-710
BrandRS PRO
TWD486.00
Each
units
M10 1mm 1in - HSS -
RS Stock No. 215-748
BrandRS PRO
TWD929.00
Each
units
M12 1.25mm 1.31in - HSS -
RS Stock No. 508-9525
Mfr. Part No.04414
BrandEXACT
TWD621.00
Each
units
7/16-20 - 30mm 11mm HSS -
RS Stock No. 509-0115
Mfr. Part No.04311
BrandEXACT
TWD499.00
Each
units
5/16-18 - 25mm 9mm HSS -
RS Stock No. 668-0738
BrandRS PRO
TWD542.00
Each
units
M12 1.75mm 25mm 9mm HSS -
RS Stock No. 508-9317
Mfr. Part No.70417
BrandEVENTUS
TWD222.00
Each
units
M8 1.25mm 25mm 9mm HSS -
RS Stock No. 215-732
BrandRS PRO
TWD1,047.00
Each
units
M12 1mm 1.31in - HSS -
RS Stock No. 215-653
BrandRS PRO
TWD365.00
Each
units
M2 0.4mm 13/16in - - -
RS Stock No. 668-0734
BrandRS PRO
TWD625.00
Each
units
M10 1.5mm 25mm 9mm HSS -
RS Stock No. 215-631
BrandRS PRO
TWD534.00
Each
units
M7 1mm 13/16in - - -
RS Stock No. 668-0750
BrandRS PRO
TWD564.00
Each
units
M6 1mm 20.63mm 6.35mm HSS Yes
RS Stock No. 215-754
BrandRS PRO
TWD1,047.00
Each
units
M12 1.5mm 1.31in - HSS -
RS Stock No. 215-760
BrandRS PRO
TWD311.00
Each
units
M4 0.5mm 13/16in - HSS -