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Insert 22 IR N60 BMA Fanar
€22.98 tax inc.
Net price: €18.68
Description
22 IR N60 BMA internal metric threading insert
Technical data for the partial-profile insert for pitches of 3.5–5.0 mm
| Technical data | |
|---|---|
| Designation | 22 IR N60 BMA |
| Type | internal threading insert, right-hand |
| Profile | partial (incomplete), 60° angle |
| Pitch range | 3.5–5.0 mm |
| Threads per inch | 7–5 |
| Corner radius | 0.30 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 | BMA: submicron carbide, PVD TiAlN |
Thread angle60°
Pitch range3.5–5.0 mm
Threads per inch7–5
Tool holdersSIR 22
22 IR N60 BMA internal metric threading insert turns internal threads with a 60° thread angle and pitches from 3.5 to 5.0 mm. One insert can cut metric coarse threads from M30 to M52, metric fine threads within this pitch range and inch UNC threads from 7 to 5 threads per inch, all 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 N60 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 moves along the bore axis. For each spindle revolution, the feed is exactly one thread pitch, for example 4 mm for an M36 thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread.
The N60 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 an M36 thread (4 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 of 29–30° to the radial direction. The insert then cuts mainly on one flank, and the chip flows to one side. The rounded N60 tip cuts almost to the depth of the ISO profile: for M36, approx. 2.30 mm versus a profile depth of 2.31 mm. Stop the infeed when a thread plug gauge or screw fits into the thread.
Cutting speed, spindle speed and number of passes
BMA is a submicron carbide grade 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.
| Pitch P [mm] | 3.5 | 4.0 | 4.5 | 5.0 |
|---|---|---|---|---|
| Threads per inch (equivalent) | — | 6 | — | — |
| Number of passes | 9–19 | 10–20 | 10–21 | 11–21 |
For pitches of 3.5, 4.5 and 5.0 mm, the number of passes is interpolated from the manufacturer's table.
Spindle speed and feed for M36
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 mm/rev.
Example: M36 in a hole in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 36) ≈ 880 rpm
vf = n × P = 880 × 4
3520 mm/min
feed rate
d – thread diameter (36 mm), n – spindle speed, vc – cutting speed from the middle of the range in the table, vf – feed rate.
Universal 60° profile – pitches from 3.5 to 5.0 mm
One thread angle, many metric and inch threads
Pitch 3.5 mm – M30
Pitch 4.0 mm – M36
Pitch 5.0 mm – M48
Three threads shown at the same scale. The same insert tip cuts each groove: angle 60°, radius 0.30 mm.
The universal 60° insert has a rounded tip with a radius of 0.30 mm. It fits both a thread groove with a pitch of 3.5 mm and one with a pitch of 5.0 mm. The lathe feed determines the pitch, while the infeed over successive passes determines the depth. This allows one insert to cover every pitch in this range.
ISO metric threads and UN unified inch threads have a 60° angle. The insert can therefore cut metric coarse threads from M30 to M52 and any metric fine thread with a pitch of 3.5–5 mm, such as M42 × 4 or M64 × 4, in holes from Ø24 mm. It also cuts UNC threads from 1 1/8"-7 to 1 1/2"-6. For short production runs, this replaces several full-profile inserts, each of which fits only one pitch.
| Pitch P [mm] | 3.5 | 4.0 | 4.5 | 5.0 |
|---|---|---|---|---|
| Metric coarse thread | M30, M33 | M36, M39 | M42, M45 | M48, M52 |
N60 vs. a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 22 IR N60
The insert machines the flanks and root of the groove over a pitch range of 3.5–5.0 mm. 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 4 ISO
The insert turns the flanks, root and crests of a thread with a 4 mm pitch. The crest is 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 N60 | Full ISO profile |
|---|---|---|
| Pitch range | 3.5–5.0 mm, 7–5 threads per inch | one pitch, e.g. 4 mm |
| 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 | 0.30 mm | matches the ISO profile for the given pitch |
| Groove depth for M36 | approx. 2.30 mm | 2.31 mm, matching the ISO profile |
| Inserts for pitches of 3.5–5.0 mm | 1 | one for each pitch |
A full-profile insert finishes the thread including the crests, making it easier to maintain the profile throughout a production run. N60 leaves the crests at the prepared hole diameter. Its corner also produces a sharper thread root than the ISO profile at larger pitches.
Hole preparation for threading with an N60 insert
Before threading, bore the hole within the 6H tolerance zone, e.g. M36: 31.670–32.270 mm, M48: 42.587–43.297 mm. A boring bar for size 22 inserts fits holes from Ø24 mm, so the smallest threads are M30 and metric fine threads of a similar diameter.
Decoding the 22 IR N60 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 N60 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 60° and a radius of 0.30 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.
N60
60° partial profile
Pitches 3.5–5.0 mm, 7–5 threads per inch.
BMA
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 N60 BMA internal metric threading insert covers all pitches from 3.5 to 5.0 mm with a 60° angle in a single cutting edge. It is useful for short production runs of various metric and UN inch threads. It requires a hole prepared in advance, but eliminates the need for a separate insert for each pitch.
22 IR N60 – questions about selection and use
Key information before selecting an insert
You can cut internal threads with a 60° angle and pitches from 3.5 to 5.0 mm in holes from Ø24 mm. These include metric coarse threads from M30 to M52, metric fine threads with these pitches, e.g. M42 × 4 or M64 × 4, as well as inch UNC threads from 1 1/8"-7 to 1 1/2"-6.
Bore the hole to size within the 6H tolerance zone, e.g. M36: 31.670–32.270 mm, M48: 42.587–43.297 mm. The insert will turn the flanks and root, while the crests remain at the hole 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 for 3.5 mm, 10–20 for 4.0 mm and 11–21 for 5.0 mm. Start in the middle of the range and add passes for harder materials. Some values were interpolated from the manufacturer's table.
It 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 a 22 IR N60 insert can turn both M30 and M52.
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