Name: Trapezoidal Thread Taps
Brand: FuRui Tooling

Product description

Trapezoidal thread taps are intended for parts with a specified trapezoidal internal-thread profile, including matching nuts in motion mechanisms. The thread designation, pitch and hand need to be explicit. Compare the selected catalog row with the component drawing and provide the required thread depth before the tap geometry and connection are confirmed.

Profile-specific tooling

Use the complete trapezoidal thread designation rather than a general-purpose tap size.

Direction and pitch

Right- or left-hand threading and the stated pitch are separate order requirements.

Mating-part reference

A nut or mating screw drawing helps establish the intended internal thread accurately.

Trapezoidal and ACME taps are not interchangeable

A metric Tr thread has a 30° included profile angle; an ACME thread uses 29°. Similar-looking diameters do not make the two thread forms interchangeable. An ordinary metric fastening thread is a different profile again.

For a single-start designation such as Tr20 × 4, 20 is the nominal diameter and 4 is the pitch, in millimeters. If the component uses multiple starts, include the lead and number of starts as well as pitch. Add right- or left-hand direction and the drawing’s fit requirement; do not order a motion-thread tap from diameter alone.

Thread-form reference: Roton trapezoidal thread terminology. This explains the profile distinction, not a FuRui standard-certification claim.

Reading the Tr20 × 4 catalog row

The supplied FuRui catalog lists Tr20 × 4 with overall length L = 170 mm, threaded length l = 100 mm, shank d1 = 14 mm and square a = 11.2 mm. The square length l2 is 14 mm; the guide dimensions are l4 = 16 mm and d4 = 16 mm.

These labels describe different parts of the tap. The guide diameter is not a recommended pre-drill size, and the listed threaded length is not a promise of usable blind-hole thread depth. Send the nut drawing, material, through/blind-hole condition and required full-thread depth so lead-in and clearance can be checked.

Request the Tr20 × 4 catalog row. If the drawing instead calls for an asymmetric profile, review buttress thread taps as a separate family.

Specifications & model range

Nominal dimensions transcribed from the supplied company's trapezoidal-tap table. The source lists sizes and lengths but does not establish thread tolerance class, handedness, tool material or suitability for a workpiece material. Confirm these and the final drawing before ordering. Source values are retained, including shank d1 = 31 mm for Tr40 and Tr42; no inferred rounding to 31.5 mm. The Tr44 × 7 overall length L is pending drawing confirmation; do not use that row to set machine clearance before the length is agreed.

Drawing confirmation requiredThe source length labels and the 31 mm shank entries for Tr40×7 and Tr42×7 need drawing confirmation. Values are transcribed as supplied and are not an approved production specification.

Thread form: Trapezoidal
Direction: Confirm right or left hand
Size and pitch: Drawing confirmed

Select an underlined catalog reference to include that row in your inquiry.

Trapezoidal Thread Taps catalog specifications
Thread designation	Total L (mm)	Thread length l1 (mm)	Square a (mm)	Square length l2 (mm)	Shank d1 (mm)	Pilot length l4 (mm)	Pilot diameter d4 (mm)
Tr8×1.5	60	24	5	8	6.3	8	6
Tr10×2	80	40	5.6	8	7.1	10	8
Tr12×3	115	63	6.3	9	8	12	9
Tr14×3	115	63	8	11	10	12	11
Tr16×4	170	100	9	12	11.2	16	12
Tr18×4	170	100	10	13	12.5	16	14
Tr20×4	170	100	11.2	14	14	16	16
Tr22×5	250	155	12.5	16	16	20	17
Tr24×5	250	155	14	18	18	20	19
Tr26×5	250	155	16	20	20	20	21
Tr28×5	250	155	18	22	22.4	20	23
Tr30×6	300	170	18	22	22.4	24	24
Tr32×6	300	170	20	24	25	24	26
Tr34×6	300	170	20	24	25	24	28
Tr36×6	300	170	22.4	26	28	24	30
Tr38×7	360	220	22.4	26	28	28	31
Tr40×7	360	220	25	28	31	28	33
Tr42×7	360	220	25	28	31	28	35
Tr44×7	Confirm drawing	220	28	31	35.5	28	37
Tr46×8	400	240	28	31	35.5	32	38
Tr48×8	400	240	28	31	35.5	32	40
Tr50×8	400	240	31.5	34	40	32	42
Tr52×8	400	240	31.5	34	40	32	44

Ranges and slash-separated values describe catalog families, not every possible combination. Confirm the complete model and drawing before ordering.

Application scenarios

Typical selection contexts for this series, not customer project claims. Confirm machine compatibility and cutting conditions for your setup.

Lead screw nuts

Producing a drawing-defined internal thread for a matched motion assembly.

Machine adjustment parts

Threading components whose drawings specify a trapezoidal profile.

Special-tool replacement

Matching an existing trapezoidal tap from its full code and geometry.

Inspection & order review

Specify the dimensions, tolerances and records your order requires. Acceptance criteria must be agreed for the selected model.

Catalog fields to check

Thread designation
Total L (mm)
Thread length l1 (mm)
Square a (mm)
Square length l2 (mm)
Shank d1 (mm)
Pilot length l4 (mm)
Pilot diameter d4 (mm)

Check the drawing reference faces and units. A catalog size alone does not define a tolerance or an inspection method.

Records to request

List any required dimensional report, material document or model identification photograph in your inquiry. Confirm availability and scope in the quotation.

For a drawing-based part, include the drawing revision and identify the critical dimensions. Website photographs are not inspection reports.

Packaging & delivery

Agree the packing method and photo requirements when confirming your order.

Order-specific photo confirmation

No verified shipment photographs for this series are currently published. Include selected-model, protective-packing and outer-label photos in your order requirements.

Discuss packing requirements

Photos to confirm before dispatch

Use this checklist to agree what should be documented for your selected model.

Tr designation and thread hand identified
Profile teeth protected from impact
Drawing revision linked to the supplied tool

Stock, dispatch date and shipping method are confirmed with the quotation. Website images are not live inventory evidence.

Technical resources

Product specifications

Keep a copy of the current series information for comparison. Confirm the final model and drawing before placing an order.

View specifications

Specify a threading tool

Prepare the thread designation, workpiece drawing and tool connection.

Read the guide

Related selection information

Browse the existing tooling guides and compare product families before selecting a model.

Browse technical resources

Compare alternative interfaces and complementary tooling. A related series is not automatically interchangeable.

View the full category

Product FAQ

Selection questions for Trapezoidal Thread Taps.

Request a quote

Can a standard metric tap produce the same profile?

No. A standard metric fastening thread and a trapezoidal Tr thread have different profiles. ACME is also distinct: its included angle is 29°, compared with 30° for metric Tr. Use the complete thread callout and drawing.

Is pitch alone enough for a motion thread?

For a single-start thread, include diameter, pitch and hand. For a multiple-start thread, also specify lead and number of starts. The table does not establish a multiple-start capability or a tolerance class for every listed size.

Are the related ball screws compatible mating parts?

No. They are related motion-system products, not a mating-part recommendation for a trapezoidal thread.

Can you supply a replacement from a nut sample?

A sample is useful, but the original thread drawing and inspection requirement are preferred for confirmation.

Trapezoidal Thread Taps

Overview