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Description
Internal trapezoidal threading insert 22 IR 5 TR
Technical data for a full-profile insert for trapezoidal threads with a 5 mm pitch
| Technical data | |
|---|---|
| Designation | 22 IR 5 TR MTA |
| Brand / part number | Horn / 15177 |
| Type | internal threading insert, right-hand |
| Profile | full, trapezoidal Tr, 30° angle |
| Pitch | 5 mm |
| Profile height | 2.75 mm |
| Thread tolerance class | 7H |
| Insert size | 22: edge 22 mm, IC 12.7 mm |
| Cutting edges | 3 |
| Tool holders | right-hand internal SIR, size 22, holes from Ø24 mm |
| Grade | MTA: submicron carbide, PVD TiAlN |
Pitch5 mm
Profilefull Tr 30°
Depth2.75 mm
Tool holdersSIR 22
Internal trapezoidal threading insert 22 IR 5 TR turns the full internal thread profile with a 5 mm pitch: flanks, roots, and crests. It is used for trapezoidal threads with a 5 mm pitch in bores from Ø24 mm; Tr threads with this pitch listed in the standard table have smaller bores. It works in size 22 right-hand SIR boring bars. It has three corners for use in succession.
Full Tr 30° profile – flanks, roots, and bore diameter
The insert finishes the thread crests in the same cycle
This insert
22 IR 5 TR – full profile
Crests trimmed to diameter D1.
Axial cross-section of a Tr 28 × 5 thread after the final pass. Gold highlights the insert; the red line indicates the surfaces machined by the insert.
The trapezoidal profile has a 30° flank angle and flat roots and crests. The internal thread profile height H4 is 0.5 of the pitch plus the crest clearance ac = 0.25 mm, giving 2.75 mm. The insert turns the flanks, roots, and crests at the bore diameter in the same cycle.
The Tr 28 × 5 thread has a bore diameter D1 = d − P = 23 mm and a root diameter D4 = d + 2 × ac = 28.5 mm (PN-ISO 2904). Tolerance 7H is specified in the trapezoidal thread standard. Bore the hole slightly undersize beforehand. An oversized bore will leave the crests unmachined and the profile too shallow. Check the finished thread with a thread plug gauge or a screw.
Threading with the 22 IR 5 TR insert – passes, feed, and cutting data
Feed of 5 mm per revolution and 11–21 progressively shallower passes
Schematic illustration: an insert in a right-hand SIR boring bar inside the workpiece bore. The insert is highlighted in gold.
One spindle revolution – 5 mm of feed
The workpiece rotates while the boring bar with the insert moves along the hole axis by 5 mm per spindle revolution. In a typical setup, the right-hand insert feeds toward the chuck and turns a right-hand thread. During the final passes, its side cutting edges trim the crests to the hole diameter.
Schematic of the passes for a Tr 28 × 5 thread. The lines show successive cutting edge positions.
Successive passes to a depth of 2.75 mm
The insert reaches a profile height of 2.75 mm in 11–21 passes (a value interpolated from the manufacturer's table); use 16 as a starting point. The first pass removes the most material, and the final pass removes 0.05–0.08 mm. Apply flank infeed at an angle slightly less than 15°, which is half the profile angle: the insert then cuts mainly on one flank.
In a blind hole, make a relief groove at the end of the thread at least 5.3 mm wide and no shallower than the infeed depth.
Cutting speed for MTA grade
MTA grade is a submicron carbide with a PVD TiAlN coating for steel, stainless steel and cast iron. The speeds in the table apply to thread turning.
| Workpiece material | Cutting speed vc [m/min] |
|---|---|
| P Unalloyed steel, cast steel, free-cutting steel | 120–180 |
| P Low-alloy steel and cast steel (up to 5% alloying elements) | 80–130 |
| P High-alloy and tool steel | 60–80 |
| M Stainless steel and stainless cast steel | 90–130 |
| K Gray cast iron | 120–130 |
| K Ductile and malleable cast iron | 100–130 |
Spindle speed and feed for Tr 28 × 5
Pitch P is measured along the axis between corresponding points on adjacent thread turns.
For each spindle revolution, the insert advances by one pitch: fn = P = 5 mm/rev.
Example: Tr 28 × 5 in a bore in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 28) ≈ 1140 rpm
vf = n × P = 1140 × 5
5700 mm/min
feed rate
d – thread diameter (28 mm), n – spindle speed, vc – cutting speed from the middle of the range in the table, vf – feed rate.
Calculate the helix angle β using tan β = P / (π × d), where P is the pitch and d is the thread diameter. For Tr 28 × 5: 5 / (π × 28) = 0.057, giving β ≈ 3.25°. Standard threading holder shims tilt the insert by 1–1.5°. This thread has a larger angle, so select a shim with an inclination closer to 3.3° using the holder manufacturer's table.
Internal threads with a 5 mm pitch – bores from Ø24 mm
The holder's minimum bore diameter determines the smallest thread
The bore for a thread with a 5 mm pitch is 5.00 mm smaller than the thread diameter. A boring bar for size 22 inserts fits bores from Ø24 mm, so the smallest thread has a diameter of approximately 29.0 mm. This thread is not listed in the standard table – it is a special thread with this pitch.
The pitch and tooth profile are independent of diameter: the thread depth is always 2.75 mm. The bore in the workpiece determines the thread diameter, not the insert.
Decoding the 22 IR 5 TR designation – element by element
Size, operating hand, pitch, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
22 IR 5 TR insert dimensions
Size 22 indicates an edge length of 22 mm and an inscribed circle IC of 12.7 mm, or 1/2 inch; it is not the thread diameter. Dimensions X = 2.0 mm and Y = 2.4 mm specify the cutting tip position relative to the sides of the insert. The corner reproduces the trapezoidal profile: a 30° angle, a flat root, and crest clearance ac = 0.25 mm.
22
Insert size
Edge 22 mm, IC 12.7 mm.
I
Internal thread
Turning inside holes with a boring bar.
R
Right-hand version
SIR boring bar, feed toward the chuck.
5
Thread pitch
5 mm; one insert for one pitch.
TR
Tr trapezoidal profile
Angle 30°, full profile, class 7H.
MTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Minimum bore size and trapezoidal threads
Threads from Tr 22 × 5 to Tr 28 × 5 have bore diameters from 17 to 23 mm. The SIR 0020 P22 boring bar requires a Ø24 mm bore, so a Tr 28 × 5 thread can only be produced with a size 22 boring bar suitable for bores starting at Ø23 mm.
Mount the threading insert in right-hand SIR boring bars for size 22 inserts, e.g., SIR 0020 P22, SIR 0025 R22 or SIR 0032 S22. A right-hand internal threading insert works only in a right-hand boring bar.
The 22 IR 5 TR internal trapezoidal threading insert turns the full internal thread profile with a 5 mm pitch in bores from Ø24 mm, always at the same depth of 2.75 mm. It is suitable for threads with this pitch at larger diameters, including sizes not listed in the standard table.
22 IR 5 TR – selection and application questions
Key information before selecting an insert
The bore for a thread with a 5 mm pitch is 5.00 mm smaller than the thread diameter. A boring bar for size 22 inserts fits bores from Ø24 mm, so the minimum thread diameter is approximately 29.0 mm. This thread is not listed in the standard table – it is a special thread with this pitch. Threads from Tr 22 × 5 to Tr 28 × 5 have bore diameters from 17 to 23 mm.
Yes. The full profile trims the thread crests at the bore diameter, e.g., 23 mm for Tr 28 × 5. Simply bore the hole slightly undersize beforehand.
The profile height is 0.5 of the pitch plus the crest clearance ac: 2.5 + 0.25 = 2.75 mm (PN-ISO 2904). It is the same for every diameter with this pitch.
For right-hand SIR boring bars for size 22 inserts, e.g., SIR 0020 P22 (holes from Ø24 mm), SIR 0025 R22 (from Ø29 mm) or SIR 0032 S22 (from Ø38 mm).
Usually 11 to 21 passes; use 16 as a starting point. The range is interpolated from the manufacturer's table for adjacent pitches.
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