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Carbide insert 22 IR N55 HTA Horn
€12.95 tax inc.
Net price: €10.53
Description
22 IR N55 internal inch threading insert
Technical data for the partial-profile insert for threads from 7 to 5 threads per inch
| Technical data | |
|---|---|
| Designation | 22 IR N55 HTA |
| Type | internal threading insert, right-hand |
| Profile | partial (incomplete), 55° angle |
| Threads per inch | 7–5 |
| Pitch range | 3.63–5.08 mm |
| Corner radius | 0.43 mm |
| Insert size | 22: edge 22 mm, IC 12.7 mm |
| Cutting edges | 3 |
| Tool holders | right-hand internal SIR holders, size 22, for bores from Ø24 mm, alternatively left-hand external SEL 22 holders |
| Grade | HTA: submicron carbide, PVD TiAlN |
Thread angle55°
Pitch range3.63–5.08 mm
Threads per inch7–5
Tool holdersSIR 22
22 IR N55 internal inch threading insert cuts internal threads with a 55° thread angle and 7 to 5 threads per inch. A single insert cuts BSW Whitworth threads within this range in holes from Ø24 mm. It works in size 22 right-hand SIR boring bars and, alternatively, in left-hand SEL 22 external holders. It has three corners: when one cutting edge wears out, index the insert to the next.
How the 22 IR N55 insert cuts threads – rotation, feed and passes
Feed equal to the pitch and several 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 – one thread pitch
The workpiece rotates while the boring bar with the insert travels along the hole axis. For each spindle revolution, the travel is exactly one pitch, e.g., 4.233 mm for a BSW 1 3/8" thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread.
The N55 insert does not touch the thread crests. They retain the diameter of the hole bored before threading, so this dimension determines the finished thread.
Schematic illustration of passes for a BSW 1 3/8" thread (4.233 mm pitch). Lines 1–6 show successive cutting edge positions.
Successive passes deepen the profile
A threading insert does not cut the thread in a single pass. It cuts deeper with each pass, while the thickness of material removed decreases from the first pass to the last. The final pass removes approx. 0.05–0.08 mm; a thinner layer causes the material to be compressed rather than cut.
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, and the chip flows to one side. The rounded N55 tip cuts deeper than the Whitworth thread root: for BSW 1 3/8", approximately 2.89 mm instead of 2.71 mm. Stop the infeed when a thread plug gauge or screw fits into the thread.
Cutting speed, spindle speed and number of passes
HTA grade is submicron carbide with a PVD TiAlN coating. It machines steels, stainless steels and cast irons. The speeds in the table apply to thread turning with this insert.
| 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 |
Select the number of passes to suit the pitch. Start in the middle of the range and add passes for harder materials.
| Threads per inch | 7 | 6 | 5 |
|---|---|---|---|
| Pitch P [mm] (equivalent) | 3.63 | 4.23 | 5.08 |
| Number of passes | 9–19 | 10–20 | 11–21 |
For 7 and 5 threads per inch, the number of passes is interpolated from the manufacturer's table.
Spindle speed and feed for BSW 1 3/8"
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 = 4.233 mm/rev.
Example: BSW 1 3/8" in a hole in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 34.925) ≈ 910 rpm
vf = n × P = 910 × 4.233
3852 mm/min
feed rate
d – thread diameter (34.925 mm), n – spindle speed, vc – cutting speed from the middle of the range in the table, vf – feed rate.
Universal 55° profile – from 7 to 5 threads per inch
One profile angle, many pipe and Whitworth threads
7 threads per inch
6 threads per inch – BSW 1 3/8"
5 threads per inch – BSW 1 5/8"
Three threads shown at the same scale. The same insert tip cuts each groove: angle 55°, radius 0.43 mm.
The universal 55° insert has a tip radius of 0.43 mm. It fits into both a thread groove with 7 threads per inch and one with 5 threads per inch. The threads per inch are determined by the lathe feed, and the depth by the infeed over successive passes. This allows one insert to cut any 55° thread within this range.
G pipe threads according to ISO 228-1 and Whitworth threads have a 55° thread angle. The insert can therefore cut BSW 1 3/8" and 1 5/8" threads in holes from Ø24 mm. For short production runs, this replaces several full-profile inserts, each suitable for a single threads-per-inch value.
| Threads per inch | 6 | 5 |
|---|---|---|
| BSW thread | 1 3/8" | 1 5/8" |
N55 vs. a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 22 IR N55
The insert machines the flanks and root of the groove over a range of 7 to 5 threads per inch. It does not touch the crests: they retain the previously turned diameter.
Choose for: short runs and various pitches.
Comparison
Full profile, e.g. 22 IR 6 W
The insert cuts the flanks and the rounded root and crests of a thread with 6 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.
| Feature | 22 IR N55 | W full profile |
|---|---|---|
| Pitch range | from 7 to 5 threads per inch | one number of threads per inch, e.g., 6 |
| Thread crest | previously bored hole diameter | turned together with the flanks |
| Hole preparation | diameter to the thread specification | diameter with a small machining allowance |
| Corner radius | 0.43 mm | matches the Whitworth profile for the specified pitch |
| Groove depth for BSW 1 3/8" | approx. 2.89 mm, deeper than the Whitworth profile | 2.71 mm, matching the Whitworth profile |
| Inserts for 7–5 threads per inch | 1 | one for each pitch |
A full-profile insert finishes the thread, including its crests, making the profile easier to maintain in production runs. N55 leaves the crests at the prepared hole diameter. Its corner also produces a sharper thread root than the Whitworth profile.
Hole and thread root with the N55 insert
Before threading, bore the hole to the thread size, e.g., BSW 1 3/8": nominal diameter 34.925 mm. The corner radius of 0.43 mm produces a sharper root than the Whitworth profile, which rounds the root to a radius of 0.137 times the pitch (0.58 mm for BSW 1 3/8"). Where a full profile is required, choose a full-profile W insert for the specified threads-per-inch value.
Decoding the 22 IR N55 designation – element by element
Size, cutting hand, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
22 IR N55 insert dimensions
The number 22 indicates the insert size: 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 = 1.7 mm and Y = 2.5 mm specify the position of the cutting tip relative to the sides of the insert. The corner has an angle of 55° and a radius of 0.43 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.
N55
55° partial profile
From 7 to 5 threads per inch.
HTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
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. The insert has the same shape as a 22 EL left-hand external insert, so it can alternatively be mounted in a left-hand SEL 22 external holder to turn a thread on a shaft. External inserts are intended for regular work on shafts. The standard shim tilts the insert by 1–1.5° to suit the thread helix angle. The shim only needs to be changed for a large pitch on a small diameter.
The 22 IR N55 internal inch threading insert covers threads from 7 to 5 threads per inch with a 55° thread angle using a single cutting edge. It is useful for short production runs of various Whitworth threads. It requires a prepared hole but eliminates the need for a separate insert for each pitch.
22 IR N55 – questions about selection and use
Key information before selecting an insert
You can cut internal threads with a 55° thread angle and 7 to 5 threads per inch in holes from Ø24 mm: BSW Whitworth threads from 1 3/8" to 1 5/8".
Bore the hole to the thread size, e.g., BSW 1 3/8": hole diameter approximately 29.50 mm. The insert will cut the flanks and root, while the crests remain at this diameter.
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). It has the same shape as a 22 EL left-hand external insert, so it also fits left-hand SEL 22 external holders as an alternative.
The number of passes increases with pitch: 9–19 at 7 threads per inch, 10–20 at 6 threads per inch, and 11–21 at 5 threads per inch. Start at the middle of the range and add passes for harder materials. Some values were interpolated from the manufacturer's table.
This is the insert size: an edge length of 22 mm and an inscribed circle of 12.7 mm (1/2 inch). The hole in the workpiece determines the thread diameter, so the 22 IR N55 insert can cut both BSW 1 3/8" and BSW 1 5/8" threads.
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