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Insert 11 ER A60 MTA Horn
€5.18 tax inc.
Net price: €4.21
Description
11 ER A60 metric threading insert – universal 60° profile
Technical data for the partial-profile insert for pitches of 0.5–1.5 mm
| Technical data | |
|---|---|
| Designation | 11 ER A60 MTA |
| Type | external 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 external SER, size 11, alternatively left-hand internal SIL 11 |
| Grade | MTA: submicron carbide, PVD TiAlN |
Thread angle60°
Pitch range0.5–1.5 mm
Threads per inch48–16
Tool holdersSER 11
11 ER A60 metric threading insert turns external threads with a 60° profile angle and pitches from 0.5 to 1.5 mm. One insert can cut metric coarse threads from M3 to M10, fine threads within this pitch range, and UNC and UNF inch threads from 48 to 16 threads per inch. It works in size 11 right-hand SER holders and, as an alternative, in left-hand SIL 11 boring bars. It has three corners: when an edge wears out, index the insert to the next corner.
How the 11 ER A60 insert cuts threads – rotation, feed, and passes
Feed equal to the pitch and several progressively shallower passes
Schematic illustration: insert in a right-hand SER holder in front of the lathe axis. Gold highlights the insert.
One spindle revolution – one thread pitch
The shaft rotates while the insert in the holder moves along its axis. For each spindle revolution, the feed is exactly one pitch, e.g., 1.25 mm for an M8 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 diameter turned before threading, so this dimension determines the finished thread.
Schematic illustration of passes for an M8 thread (1.25 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 0.90 mm instead of 0.77 mm for M8. Stop the infeed when a thread ring gauge or nut fits onto 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 |
|---|---|---|---|---|---|
| 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 M8
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 = 1.25 mm/rev.
Example: M8 in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 8) ≈ 3980 rpm
vf = n × P = 3980 × 1.25
4975 mm/min
feed rate
d – thread diameter (8 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 – M3
Pitch 1.0 mm – M6
Pitch 1.5 mm – M10
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 coarse threads from M3 to M10 and every metric fine thread with a 0.5–1.5 mm pitch, e.g., M8 × 1 or M12 × 1.5. It can also cut UNC threads from #3-48 to 3/8"-16 and UNF threads from #4-48 to 3/4"-16. For short production runs, this replaces several full-profile inserts, each of which fits a single pitch.
| Pitch P [mm] | 0.5 | 0.7 | 0.8 | 1.0 | 1.25 | 1.5 |
|---|---|---|---|---|---|---|
| Metric coarse thread | M3 | M4 | M5 | M6 | M8 | M10 |
A60 versus a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 11 ER 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 ER 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 ER 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 turned diameter | turned together with the flanks |
| Shaft 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 M8 | approx. 0.90 mm, deeper than the ISO profile | 0.77 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 crests as well, making the profile easier to maintain in production runs. A60 leaves the crests at the diameter you turn. Its narrow corner also produces a sharper thread root than the ISO profile at larger pitches.
Thread diameter and root with an A60 insert
Before threading, turn the major diameter within tolerance class 6g, e.g., M8: 7.760–7.972 mm, M10: 9.732–9.968 mm. The corner radius of 0.05 mm produces a sharp thread root. PN-ISO 965-1 requires bolts of property class 8.8 and higher to have a root radius of at least 0.125 times the pitch, or 0.16 mm for M8. For these bolts, choose a full-profile insert for the specified pitch.
Decoding 11 ER A60 – 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.
Dimensions of the 11 ER A60 insert
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.
E
External thread
Turning on shafts and journals.
R
Right-hand version
SER holder, feed toward the chuck.
A60
60° partial profile
Pitches 0.5–1.5 mm, 48–16 threads per inch.
MTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Mount the threading insert in right-hand external SER holders for size 11 inserts, e.g., SER 1010 H11, SER 1212 K11, or SER 1212 M11. The insert has the same shape as the left-hand internal 11 IL insert, so it can alternatively be mounted in a left-hand SIL 11 boring bar to cut an internal thread. Internal inserts are intended for regular internal threading. The standard shim tilts the insert by 1–1.5° to suit the thread helix angle. The shim only needs to be replaced for a large pitch on a small diameter.
The 11 ER A60 metric threading insert covers all pitches from 0.5 to 1.5 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 diameter to be prepared beforehand but eliminates the need for a separate insert for each pitch.
11 ER A60 – selection and application questions
Key information before selecting an insert
You can cut external threads with a 60° thread angle and pitches from 0.5 to 1.5 mm. These include metric coarse threads from M3 to M10, metric fine threads with these pitches, such as M8 × 1 or M12 × 1.5, and inch threads: UNC from #3-48 to 3/8"-16 and UNF from #4-48 to 3/4"-16.
Turn the major diameter to the thread dimension within tolerance class 6g, e.g., M5: 4.826–4.976 mm, M10: 9.732–9.968 mm. The insert cuts the flanks and root, while the crests remain at this diameter.
Right-hand SER external holders for size 11 inserts, such as SER 0808 H11, SER 1010 H11, SER 1212 K11 or SER 1212 M11. It has the same shape as the 11 IL left-hand internal insert, so it also fits left-hand SIL 11 boring bars 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 workpiece shaft determines the thread diameter, so the 11 ER A60 insert can turn both M4 and M10 threads.
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