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Carbide insert 16 IR AG60 MTA Horn
€5.83 tax inc.
Net price: €4.74
Description
16 IR AG60 internal metric threading insert
Technical data for the partial-profile insert for pitches of 0.5–3.0 mm
| Technical data | |
|---|---|
| Designation | 16 IR AG60 MTA |
| Type | internal threading insert, right-hand |
| Profile | partial (incomplete), 60° angle |
| Pitch range | 0.5–3.0 mm |
| Threads per inch | 48–8 |
| Corner radius | 0.05 mm |
| Insert size | 16: edge 16 mm, IC 9.525 mm |
| Cutting edges | 3 |
| Tool holders | right-hand internal SIR holders, size 16, for bores from Ø16 mm, alternatively left-hand external SEL 16 holders |
| Grade | MTA: submicron carbide, PVD TiAlN |
Thread angle60°
Pitch range0.5–3.0 mm
Threads per inch48–8
Tool holdersSIR 16
16 IR AG60 internal metric threading insert turns internal threads with a thread angle of 60° and pitches from 0.5 to 3.0 mm. A single insert can cut metric coarse threads from M20 to M27, metric fine threads within this pitch range, and UNC and UNF inch threads from 48 to 8 threads per inch, all in bores from Ø16 mm. It works in right-hand SIR boring bars, size 16, and alternatively in left-hand SEL 16 external holders. It has three corners: when one cutting edge wears out, rotate the insert to the next corner.
How the 16 IR AG60 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 2.5 mm for an M20 thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread.
The AG60 insert does not contact the thread crests. They retain the bore diameter machined before threading, so this dimension determines the finished thread.
Schematic illustration of passes for an M20 thread (2.5 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 narrow AG60 tip cuts deeper than the ISO thread root: for M20, approx. 1.57 mm instead of 1.44 mm. Stop the infeed when a thread plug gauge or screw fits into the thread.
Cutting speed, spindle speed and number of passes
MTA grade is a 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.
| Pitch P [mm] | 0.5 | 0.8 | 1.0 | 1.25 | 1.5 | 1.75 | 2.0 | 2.5 | 3.0 |
|---|---|---|---|---|---|---|---|---|---|
| Threads per inch (equivalent) | 48 | 32 | 24 | 20 | 16 | 14 | 12 | 10 | 8 |
| Number of passes | 3–6 | 4–7 | 4–9 | 6–10 | 5–11 | 9–12 | 6–13 | 7–15 | 8–17 |
Spindle speed and feed for M20
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 = 2.5 mm/rev.
Example: M20 in a hole in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 20) ≈ 1590 rpm
vf = n × P = 1590 × 2.5
3975 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.
Universal 60° profile – pitches from 0.5 to 3.0 mm
One thread angle, many metric and inch threads
Pitch 0.5 mm
Pitch 1.5 mm – M20 × 1.5
Pitch 3.0 mm – M24
Three threads shown at the same scale. The same insert tip cuts each groove: angle 60°, radius 0.05 mm.
The universal 60° insert has a narrow tip with a radius of 0.05 mm. It fits both a thread groove with a pitch of 0.5 mm and one with a pitch of 3.0 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 M20 to M27 and any metric fine thread with a pitch of 0.5–3 mm, such as M20 × 1.5 or M36 × 3, in holes from Ø16 mm. It also cuts UNC threads from 3/4"-10 to 1"-8 and UNF threads from 3/4"-16 to 1 1/2"-12. For short production runs, this replaces several full-profile inserts, each of which fits only one pitch.
| Pitch P [mm] | 2.5 | 3.0 |
|---|---|---|
| Metric coarse thread | M20, M22 | M24, M27 |
AG60 vs. a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 16 IR AG60
The insert machines the flanks and root of the groove over a pitch range of 0.5–3.0 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. 16 IR 1.5 ISO
The insert turns the flanks, root and crests of a thread with a 1.5 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 | 16 IR AG60 | Full ISO profile |
|---|---|---|
| Pitch range | 0.5–3.0 mm, 48–8 threads per inch | one pitch, e.g. 1.5 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 | 0.05 mm | matches the ISO profile for the given pitch |
| Groove depth for M20 | approx. 1.57 mm, deeper than the ISO profile | 1.44 mm, matching the ISO profile |
| Inserts for pitches of 0.5–3.0 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. AG60 leaves the crests at the prepared hole diameter. Its narrow corner also produces a sharper thread root than the ISO profile at larger pitches.
Hole preparation for threading with an AG60 insert
Before threading, bore the hole within the 6H tolerance zone, e.g. M20: 17.294–17.744 mm, M24: 20.752–21.252 mm. A boring bar for size 16 inserts fits holes from Ø16 mm, so the smallest threads are M20 and metric fine threads of a similar diameter.
Decoding the 16 IR AG60 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.
16 IR AG60 insert dimensions
The number 16 indicates the insert size: 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 = 1.2 mm and Y = 1.7 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 0.05 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.
AG60
60° partial profile
Pitches 0.5–3.0 mm, 48–8 threads per inch.
MTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
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. The insert has the same shape as a 16 EL left-hand external insert, so it can alternatively be mounted in a left-hand SEL 16 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 16 IR AG60 internal metric threading insert covers all pitches from 0.5 to 3.0 mm with a 60° thread angle in a single cutting edge. It is suitable for short runs of various metric and UN inch threads. It requires the bore to be prepared beforehand but eliminates the need for a separate insert for each pitch.
16 IR AG60 – questions about selection and use
Key information before selecting an insert
You can cut internal threads with a 60° angle and pitches from 0.5 to 3.0 mm in holes from Ø16 mm. These include metric coarse threads from M20 to M27, metric fine threads with these pitches, e.g. M20 × 1.5 or M36 × 3, as well as inch UNC threads from 3/4"-10 to 1"-8 and UNF threads from 3/4"-16 to 1 1/2"-12.
Bore the hole to size within the 6H tolerance zone, e.g. M20: 17.294–17.744 mm, M24: 20.752–21.252 mm. The insert will turn the flanks and root, while the crests remain at the hole diameter.
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). It has the same shape as a 16 EL left-hand external insert, so it also fits left-hand SEL 16 external holders as an alternative.
The number of passes increases with pitch: 3–6 for 0.5 mm, 5–11 for 1.5 mm and 8–17 for 3.0 mm. Start in the middle of the range and add passes for harder materials.
It is the insert size: an edge length of 16 mm and an inscribed circle of 9.525 mm (3/8 inch). The hole in the workpiece determines the thread diameter, so a 16 IR AG60 insert can turn both M20 and M27.
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