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Carbide insert 16 IR AG55 MTA Horn
€5.83 tax inc.
Net price: €4.74
Description
16 IR AG55 internal inch threading insert
Technical data for the partial-profile insert for threads from 48 to 8 threads per inch
| Technical data | |
|---|---|
| Designation | 16 IR AG55 MTA |
| Type | internal threading insert, right-hand |
| Profile | partial (incomplete), 55° angle |
| Threads per inch | 48–8 |
| Pitch range | 0.53–3.17 mm |
| Corner radius | 0.07 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 angle55°
Pitch range0.53–3.17 mm
Threads per inch48–8
Tool holdersSIR 16
16 IR AG55 internal inch threading insert turns internal threads with a 55° thread angle and 48 to 8 threads per inch. A single insert cuts G pipe threads from G 1/2 to G 6 and Whitworth BSW and BSF threads within this range in bores from Ø16 mm. It works in size 16 right-hand SIR boring bars and, alternatively, in left-hand SEL 16 external holders. It has three corners: when an edge wears out, index the insert to the next corner.
How the 16 IR AG55 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, it advances by exactly one pitch, e.g. 1.814 mm for a G 1/2 thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread.
The AG55 insert does not contact the thread crests. They retain the bore diameter machined before threading, so this dimension determines the finished thread.
Schematic of the passes for a G 1/2 thread (1.814 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 narrow AG55 tip cuts deeper than the Whitworth thread root: for G 1/2, approximately 1.37 mm instead of 1.16 mm. Stop the infeed when a thread plug gauge or screw enters 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.
| Threads per inch | 48 | 28 | 19 | 14 | 11 | 8 |
|---|---|---|---|---|---|---|
| Pitch P [mm] (equivalent) | 0.53 | 0.91 | 1.34 | 1.81 | 2.31 | 3.17 |
| Number of passes | 3–6 | 4–8 | 6–10 | 9–12 | 7–14 | 8–17 |
For 28, 19, and 11 threads per inch, the number of passes is interpolated from the manufacturer's table.
Spindle speed and feed for G 1/2
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 = 1.814 mm/rev.
Example: G 1/2 in a bore in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 20.955) ≈ 1520 rpm
vf = n × P = 1520 × 1.814
2758 mm/min
feed rate
d – thread diameter (20.955 mm), n – spindle speed, vc – cutting speed from the middle of the range in the table, vf – feed rate.
Universal 55° profile – from 48 to 8 threads per inch
One profile angle, many pipe and Whitworth threads
28 threads per inch
14 threads per inch – G 1/2
8 threads per inch – BSW 1"
Three threads shown at the same scale. The same insert tip cuts each groove: angle 55°, radius 0.07 mm.
The universal 55° insert has a tip radius of 0.07 mm. It fits into both a thread groove with 28 threads per inch and one with 8 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 to ISO 228-1 and Whitworth threads have a 55° thread angle. The insert therefore cuts G threads from G 1/2 to G 6, BSW threads 7/8" and 1", and BSF threads 3/4" and 7/8", in bores from Ø16 mm. In short runs, this replaces several full-profile inserts, each suited to a single number of threads per inch.
| Threads per inch | 14 | 11 | 9 | 8 |
|---|---|---|---|---|
| G pipe thread | G 1/2, G 5/8, G 3/4, G 7/8 | G 1, G 1 1/8, G 1 1/4, G 1 1/2, G 1 3/4, G 2, G 2 1/4, G 2 1/2, G 2 3/4, G 3, G 3 1/2, G 4, G 4 1/2, G 5, G 5 1/2, G 6 | — | — |
| BSW thread | — | — | 7/8" | 1" |
AG55 vs. a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 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.
Comparison
Full profile, e.g. 16 IR 14 W
The insert cuts the flanks and the rounded root and crests of a thread with 14 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 | 16 IR AG55 | W full profile |
|---|---|---|
| Pitch range | from 48 to 8 threads per inch | one number of threads per inch, e.g., 14 |
| 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 | 0.07 mm | matches the Whitworth profile for the specified pitch |
| Groove depth for G 1/2 | approx. 1.37 mm, deeper than the Whitworth profile | 1.16 mm, matching the Whitworth profile |
| Inserts for 48–8 threads per inch | 1 | one for each pitch |
A full-profile insert finishes the thread crests as well, making the profile easier to maintain in production runs. AG55 leaves the crests at the bore diameter you prepare. Its narrow corner also produces a sharper thread root than the Whitworth profile.
Bore and thread root with an AG55 insert
Before threading, bore the hole to the dimension required for the thread, e.g. G 1/2: bore 18.631–19.172 mm. A corner with a 0.07 mm radius produces a sharper root than the Whitworth profile, which rounds the root with a radius of 0.137 times the pitch (0.25 mm for G 1/2). Where a complete profile is required, select a full-profile W insert for the specific number of threads per inch.
Decoding the 16 IR AG55 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 AG55 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 55° and a radius of 0.07 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.
AG55
55° partial profile
From 48 to 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 AG55 internal inch threading insert covers threads from 48 to 8 threads per inch with a 55° thread angle in a single cutting edge. It is suitable for short runs of various G pipe threads and Whitworth threads. It requires the bore to be prepared beforehand but eliminates the need for a separate insert for each pitch.
16 IR AG55 – questions about selection and use
Key information before selecting an insert
You can cut internal threads with a 55° thread angle and 48 to 8 threads per inch in bores from Ø16 mm: G pipe threads from G 1/2 to G 6, Whitworth BSW threads from 7/8" to 1", and BSF threads from 3/4" to 7/8".
Bore the hole to the dimension required for the thread, e.g. G 1/2: bore 18.631–19.172 mm. The insert will turn the flanks and root, while the crests remain at this 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: 4–8 at 28 threads per inch, 9–12 at 14 threads per inch, and 8–17 at 8 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 16 mm and an inscribed circle of 9.525 mm (3/8 inch). The bore in the workpiece determines the thread diameter, so the 16 IR AG55 insert can turn both G 1/2 and G 2 threads.
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