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Description
Internal trapezoidal threading insert 16 IR 1.5 TR
Technical data for a full-profile insert for trapezoidal threads with a 1.5 mm pitch
| Technical data | |
|---|---|
| Designation | 16 IR 1.5 TR MTA |
| Brand / part number | Horn / 15166 |
| Type | internal threading insert, right-hand |
| Profile | full, trapezoidal Tr, 30° angle |
| Pitch | 1.5 mm |
| Profile height | 0.90 mm |
| Thread tolerance class | 7H |
| Insert size | 16: edge 16 mm, IC 9.525 mm |
| Cutting edges | 3 |
| Tool holders | right-hand internal SIR, size 16, holes from Ø16 mm |
| Grade | MTA: submicron carbide, PVD TiAlN |
Pitch1.5 mm
Profilefull Tr 30°
Depth0.90 mm
Tool holdersSIR 16
Internal trapezoidal threading insert 16 IR 1.5 TR turns the full internal thread profile with a 1.5 mm pitch: flanks, roots, and crests. It is used for trapezoidal threads with a 1.5 mm pitch in bores from Ø16 mm; Tr threads with this pitch listed in the standard table have smaller bores. It works in size 16 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
16 IR 1.5 TR – full profile
Crests trimmed to diameter D1.
Axial section of a thread with a 1.5 mm pitch after the final pass. Gold highlights the insert; the red line indicates 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 = 0.15 mm, giving 0.90 mm. The insert turns the flanks, roots, and crests at the bore diameter in the same cycle.
Calculate the bore for an internal thread using D1 = D − 1 × P, where D is the thread diameter. For a diameter of 20 mm and a pitch of 1.5 mm, the result is D1 = 18.50 mm. Bore the hole slightly undersize beforehand. An oversized bore leaves the crests unmachined and produces a profile that is too shallow. Check the finished thread with a thread plug gauge or a screw.
Threading with the 16 IR 1.5 TR insert – passes, feed, and cutting data
Feed of 1.5 mm per revolution and 5–11 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 – 1.5 mm of feed
The workpiece rotates while the boring bar with the insert moves along the hole axis by 1.5 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 illustration of passes for a thread with a 1.5 mm pitch. The lines show successive cutting edge positions.
Successive passes to a depth of 0.90 mm
The insert reaches a profile height of 0.90 mm in 5–11 passes; use 8 as a starting point. The first pass removes the most material; the final pass removes 0.05–0.08 mm. Use 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 1.6 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 a thread with a diameter of 20 mm
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 = 1.5 mm/rev.
Example: an internal thread with a diameter of 20 mm and a pitch of 1.5 mm in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 20) ≈ 1590 rpm
vf = n × P = 1590 × 1.5
2385 mm/min
feed rate
d – thread diameter (20 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 a diameter of 20 mm: 1.5 / (π × 20) = 0.024, giving β ≈ 1.37°. Standard threading holder shims tilt the insert by 1–1.5°, so they do not need to be replaced for this thread.
Internal threads with a 1.5 mm pitch – bores from Ø16 mm
The holder's minimum bore diameter determines the smallest thread
The bore for a thread with a 1.5 mm pitch is 1.50 mm smaller than the thread diameter. A boring bar for size 16 inserts fits bores from Ø16 mm, so the smallest thread has a diameter of approximately 17.5 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 0.90 mm. The bore in the workpiece determines the thread diameter, not the insert.
Decoding the 16 IR 1.5 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.
16 IR 1.5 TR insert dimensions
Size 16 indicates an edge length of 16 mm and an inscribed circle IC of 9.525 mm, or 3/8 inch; it is not the thread diameter. Dimensions X = 1.0 mm and Y = 1.1 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 = 0.15 mm.
16
Insert size
Edge 16 mm, IC 9.525 mm.
I
Internal thread
Turning inside holes with a boring bar.
R
Right-hand version
SIR boring bar, feed toward the chuck.
1.5
Thread pitch
1.5 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 8 × 1.5 to Tr 10 × 1.5 have bore diameters from 6.5 to 8.5 mm. These are smaller than Ø16 mm – the minimum bore for a boring bar using size 16 inserts. These threads require a size 08 miniature insert.
Mount the threading insert in right-hand SIR boring bars for size 16 inserts, e.g. SIR 0013 M16, SIR 0016 P16 or SIR 0020 P16. A right-hand internal insert works only in a right-hand boring bar.
The 16 IR 1.5 TR internal trapezoidal threading insert turns the full internal thread profile with a 1.5 mm pitch in bores from Ø16 mm, always at the same depth of 0.90 mm. It is suitable for threads with this pitch at larger diameters, including sizes not listed in the standard table.
16 IR 1.5 TR – selection and application questions
Key information before selecting an insert
The bore for a thread with a 1.5 mm pitch is 1.50 mm smaller than the thread diameter. A boring bar for size 16 inserts fits bores from Ø16 mm, so the minimum thread diameter is approximately 17.5 mm. This thread is not listed in the standard table – it is a special thread with this pitch. Threads from Tr 8 × 1.5 to Tr 10 × 1.5 have bore diameters from 6.5 to 8.5 mm.
Yes. The full profile trims the thread crests to the bore diameter. Simply bore the hole slightly undersize beforehand.
The profile height is 0.5 of the pitch plus the crest clearance ac: 0.75 + 0.15 = 0.90 mm (PN-ISO 2904). It is the same for every diameter with this pitch.
Right-hand SIR boring bars for size 16 inserts, e.g. SIR 0013 M16 (holes from Ø16 mm), SIR 0016 P16 (from Ø19 mm), SIR 0020 P16 (from Ø24 mm) or SIR 0025 R16 (from Ø29 mm).
Usually 5 to 11 passes; start with 8. For harder materials, add passes instead of increasing the cutting speed.
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