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Insert 11 IR A60 BMA Fanar
0000010206
Thread pitch: 0.5-1.5 mm3 sizes of this insert
€14.57 tax inc.
Net price: €11.84
Description
11 IR A60 BMA internal metric threading insert
Technical data for the partial-profile insert for pitches of 0.5–1.5 mm
| Technical data | |
|---|---|
| Designation | 11 IR A60 BMA |
| Type | internal threading insert, right-hand |
| Profile | partial (incomplete), 60° angle |
| Pitch range | 0.5–1.5 mm |
| Threads per inch | 48–16 |
| Corner radius | 0.05 mm |
| Insert size | 11: edge 11 mm, IC 6.35 mm |
| Cutting edges | 3 |
| Tool holders | right-hand internal SIR holders, size 11, for bores from Ø12 mm, alternatively left-hand external SEL 11 holders |
| Grade | BMA: submicron carbide, PVD TiAlN |
Thread angle60°
Pitch range0.5–1.5 mm
Threads per inch48–16
Tool holdersSIR 11
11 IR A60 BMA internal metric threading insert turns internal threads with a 60° profile angle and pitches from 0.5 to 1.5 mm. A single insert can cut metric fine threads with these pitches, starting at M14 × 1, and UNF inch threads from 48 to 16 threads per inch, all in bores from Ø12 mm. It operates in size 11 right-hand SIR boring bars and, alternatively, in left-hand SEL 11 external holders. It has three corners: when a cutting edge wears out, index the insert to the next corner.
How the 11 IR A60 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. The travel per spindle revolution is exactly one pitch, e.g., 1.5 mm for an M14 × 1.5 thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread.
The A60 insert does not touch the thread crests. They retain the bore diameter machined before threading, so this dimension determines the finished thread.
Schematic illustration of passes for an M14 × 1.5 thread (1.5 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 in one direction. The narrow A60 tip penetrates deeper than the ISO thread root: approximately 0.92 mm instead of 0.87 mm for M14 × 1.5. 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] | 0.5 | 0.8 | 1.0 | 1.25 | 1.5 |
|---|---|---|---|---|---|
| Threads per inch (equivalent) | 48 | 32 | 24 | 20 | 16 |
| Number of passes | 3–6 | 4–7 | 4–9 | 6–10 | 5–11 |
Spindle speed and feed for M14 × 1.5
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 = 1.5 mm/rev.
Example: M14 × 1.5 in a hole in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 14) ≈ 2270 rpm
vf = n × P = 2270 × 1.5
3405 mm/min
feed rate
d – thread diameter (14 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 1.5 mm
One thread angle, many metric and inch threads
Pitch 0.5 mm
Pitch 1.0 mm – M14 × 1
Pitch 1.5 mm – M14 × 1.5
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 1.5 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 unified UN inch threads have a 60° angle. The insert can therefore cut metric threads: every metric fine thread with a 0.5–1.5 mm pitch, e.g., M14 × 1.5 or M20 × 1, in bores from Ø12 mm. It can also cut UNF threads from 9/16"-18 to 3/4"-16. For short production runs, this replaces several full-profile inserts, each of which fits a single pitch.
| Pitch P [mm] | 1.0 | 1.5 |
|---|---|---|
| Smallest thread in a bore from Ø12 mm | M14 × 1 | M14 × 1.5 |
A60 versus a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 11 IR A60
The insert machines the flanks and root of the groove over a pitch range of 0.5–1.5 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. 11 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 | 11 IR A60 | Full ISO profile |
|---|---|---|
| Pitch range | 0.5–1.5 mm, 48–16 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 M14 × 1.5 | approx. 0.92 mm, deeper than the ISO profile | 0.87 mm, matching the ISO profile |
| Inserts for pitches of 0.5–1.5 mm | 1 | one for each pitch |
A full-profile insert finishes the thread, including the crests, making it easier to maintain a consistent profile in production runs. A60 leaves the crests at the bore diameter you prepare. Its narrow corner also produces a sharper thread root than the ISO profile at larger pitches.
Bore preparation for threading with the A60 insert
Before threading, bore the hole within the 6H tolerance zone, e.g., M14 × 1.5: 12.376–12.676 mm, M20 × 1.5: 18.376–18.676 mm. A boring bar for size 11 inserts fits bores from Ø12 mm, so the smallest threads are M14 × 1 and 14 × 1.5, and metric fine threads of similar diameter.
Decoding the 11 IR A60 designation – part by part
Size, cutting hand, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
11 IR A60 insert dimensions
The number 11 indicates the insert size: an edge length of 11 mm and an inscribed circle IC of 6.35 mm, or 1/4 inch. It is not the thread diameter. Dimensions X = 0.8 mm and Y = 0.9 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.
11
Insert size
Edge 11 mm, IC 6.35 mm.
I
Internal thread
Turning inside holes with a boring bar.
R
Right-hand version
SIR boring bar, feed toward the chuck.
A60
60° partial profile
Pitches 0.5–1.5 mm, 48–16 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 11 inserts, e.g., SIR 0010 H11, SIR 0010 K11, or SIR 0013 L11. The insert has the same shape as the left-hand external 11 EL insert, so it can alternatively be mounted in a left-hand SEL 11 external holder to turn a thread on a shaft. External inserts are intended for regular threading on shafts. The standard shim tilts the insert by 1–1.5° to accommodate the thread helix angle. The shim only needs to be replaced for a large pitch on a small diameter.
The 11 IR A60 BMA internal metric threading insert covers all pitches from 0.5 to 1.5 mm with a 60° angle using a single cutting edge. It is useful for short production runs of various metric and UN inch threads. The bore must be prepared beforehand, but a separate insert is not required for each pitch.
11 IR A60 – selection and application questions
Key information before selecting an insert
You can cut internal threads with a 60° angle and pitches from 0.5 to 1.5 mm in bores from Ø12 mm. These include metric fine threads with these pitches, e.g., M14 × 1.5 or M20 × 1, and UNF inch threads from 9/16"-18 to 3/4"-16.
Bore the hole to size within the 6H tolerance zone, e.g., M14 × 1.5: 12.376–12.676 mm, M20 × 1.5: 18.376–18.676 mm. The insert turns the flanks and root, while the crests remain at the bore diameter.
Right-hand SIR boring bars for size 11 inserts, e.g., SIR 0010 H11 and SIR 0010 K11 (bores from Ø12 mm), or SIR 0013 L11 (from Ø15 mm). It has the same shape as the left-hand external 11 EL insert, so it also fits left-hand SEL 11 external holders as an alternative.
The number of passes increases with pitch: 3–6 for 0.5 mm, 4–9 for 1.0 mm and 5–11 for 1.5 mm. Start in the middle of the range and add passes for harder materials.
This is the insert size: an edge length of 11 mm and an inscribed circle of 6.35 mm (1/4 inch). The bore in the workpiece determines the thread diameter, so the 11 IR A60 insert can turn both M14 × 1 and M30 × 1.5.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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