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Description
Internal inch threading insert 16 IR 19 W
Technical data for the full-profile insert for 19 threads per inch
| Technical data | |
|---|---|
| Designation | 16 IR 19 W MTA |
| Brand / part number | Horn / 14726 |
| Type | internal threading insert, right-hand |
| Profile | full, Whitworth, 55° angle |
| Pitch | 19 threads per inch (P = 1.337 mm) |
| Thread depth | 0.86 mm |
| Thread tolerance class | G: one class, no letter |
| 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 |
Threads per inch19
Profilefull 55°
Depth0.86 mm
Tool holdersSIR 16
Internal inch threading insert 16 IR 19 W turns the full internal thread profile at 19 threads per inch: flanks, rounded roots, and crests. It is used for threads with 19 threads per inch in bores from Ø16 mm; G 1/4 and G 3/8 threads with this thread count have smaller bores. It works in size 16 right-hand SIR boring bars. It has three corners for use in succession.
Full 55° profile – rounded thread root and crests
The insert finishes the thread crests in the same cycle
This insert
16 IR 19 W – full profile
Crests rounded at diameter D1.
Comparison
Partial profile, e.g. 16 IR AG55
The crests remain as produced by boring the hole.
Axial section of a thread with a 1.337 mm pitch after the final pass. Gold highlights the insert; the red line indicates surfaces machined by the insert.
The Whitworth profile has a 55° angle and rounded thread roots and crests. The radius is 0.137 of the pitch, or approximately 0.18 mm at 19 threads per inch. The full-profile insert turns the flanks and both radii in the same cycle, producing the complete thread profile without separate bore machining.
Calculate the bore for an internal thread using D1 = D − 1.2807 × P, where D is the thread diameter. For a diameter of 20 mm and 19 threads per inch, the result is D1 = 18.29 mm. 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.
This insert
Full profile 16 IR 19 W
The insert cuts the flanks and the rounded root and crests of a thread with 19 threads per inch. The radii are formed in the same cycle as the flanks, ensuring a repeatable profile in production runs.
Choose for: production runs of threads with a single pitch.
Comparison
Partial profile, e.g. 16 IR AG55
The insert machines the flanks and root of the groove over a range of 48 to 8 threads per inch. It does not touch the crests: they retain the previously turned diameter.
Choose for: short runs and various pitches.
Threading with the 16 IR 19 W insert – passes, feed, and cutting data
Feed of 1.337 mm per revolution (19 threads per inch) and 6–10 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 – 1.337 mm of feed
The workpiece rotates while the boring bar with the insert moves along the hole axis by 1.337 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 1.337 mm pitch. The lines show successive cutting edge positions.
Successive passes to a depth of 0.86 mm
The insert reaches a depth of 0.86 mm in 6–10 passes (value interpolated from the manufacturer's table); 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 27.5°, which is half the thread 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 1.5 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 = 1.337 mm/rev.
Example: a thread with a diameter of 20 mm and 19 threads per inch in a bore in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 20) ≈ 1590 rpm
vf = n × P = 1590 × 1.337
2126 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: 1.337 / (π × 20) = 0.021, giving β ≈ 1.22°. 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 19 threads per inch – bores from Ø16 mm
The holder's minimum bore diameter determines the smallest thread
The bore for a thread with 19 threads per inch is 1.71 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 17.7 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 0.86 mm. The bore in the workpiece determines the thread diameter, not the insert.
Decoding the 16 IR 19 W designation – element by element
Size, cutting hand, threads-per-inch value, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
16 IR 19 W 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 = 0.8 mm and Y = 1.0 mm specify the cutting tip position relative to the insert sides. The corner reproduces the Whitworth profile: a 55° angle and rounding radii of 0.137 times the pitch.
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.
19
Threads per inch
19 threads per inch, 1.337 mm pitch.
W
Whitworth profile
55° angle, full profile, rounded root.
MTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
G 1/4 and G 3/8 threads require a smaller bore
G 1/4 and G 3/8 threads have bore diameters of 11.4 and 14.9 mm. These are smaller than Ø16 mm – the minimum bore for a boring bar using size 16 inserts. For these threads, choose a 11 IR 19 W insert (bores from Ø12 mm, G 3/8 thread) or a miniature 08 IR 19 W 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 19 W internal inch threading insert turns the full internal thread profile at 19 threads per inch in bores from Ø16 mm, always at the same depth of 0.86 mm. It is suitable for threads with this pitch at larger diameters, including sizes not listed in the standard table.
16 IR 19 W – selection and application questions
Key information before selecting an insert
The bore for a thread with 19 threads per inch is 1.71 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 17.7 mm. This thread is not listed in the standard table – it is a special thread with this pitch. G 1/4 and G 3/8 threads have bore diameters of 11.4 and 14.9 mm.
Yes. The full profile trims the thread crests to the bore diameter. Simply bore the hole slightly undersize beforehand.
The Whitworth profile depth is 0.6403 times the pitch, or 0.86 mm at 19 threads per inch (1.337 mm pitch). It is the same for every G thread with this threads-per-inch value.
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 6 to 10 passes; use 8 as a starting point. The range is interpolated from the manufacturer's table for adjacent pitches.
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