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Description
16 IL 1.5 ISO BMA internal metric threading insert
Technical data for the full-profile insert for 1.5 mm pitch
| Technical data | |
|---|---|
| Designation | 16 IL 1.5 ISO BMA |
| Brand / part number | Fanar / 0000009079 |
| Type | left-hand internal threading insert |
| Profile | full, ISO metric, 60° angle |
| Pitch | 1.5 mm |
| Infeed depth | 0.87 mm |
| Thread tolerance class | 6H |
| Insert size | 16: edge 16 mm, IC 9.525 mm |
| Cutting edges | 3 |
| Tool holders | left-hand internal SIL holders, size 16, for bores from Ø16 mm |
| Grade | BMA: submicron carbide, PVD TiAlN |
Pitch1.5 mm
Profilefull ISO
Infeed depth0.87 mm
Tool holdersSIL 16
16 IL 1.5 ISO BMA internal metric threading insert turns the complete internal thread profile with a pitch of 1.5 mm: flanks, root and crests. It cuts metric fine threads from M18 × 1.5 to M80 × 1.5 in bores from Ø16 mm. It works in size 16 left-hand SIL boring bars. It has three corners for successive use.
Full ISO profile – flanks, root and thread hole diameter
The insert finishes the thread crests in the same cycle
This insert
16 IL 1.5 ISO – full profile
Crests trimmed to diameter D1.
Comparison
Partial profile, e.g. 16 IL AG60
The crests remain as produced by boring the hole.
Axial section of an M20 × 1.5 thread after the final pass. Gold highlights the insert; the red line marks the surfaces machined by the insert.
A full-profile threading insert has short cutting edges on both sides of the tooth. During the final passes, they trim the thread crests to the hole diameter, which is the thread minor diameter D1. The insert therefore turns both the groove and the hole diameter itself, with a crest flat equal to 1/4 of the pitch, or approx. 0.38 mm.
For an M20 × 1.5 thread in the 6H tolerance zone, the hole diameter is 18.376–18.676 mm and the pitch diameter is 19.026–19.216 mm. Bore the hole slightly undersize beforehand. An oversized hole will leave the crests unmachined and produce a profile that is too shallow. Check the finished thread with a thread plug gauge or screw.
This insert
Full profile 16 IL 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.
Comparison
Partial profile, e.g. 16 IL 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.
Threading with the 16 IL 1.5 ISO insert – passes, feed and cutting data
Feed of 1.5 mm per revolution and 5–11 progressively shallower passes
Schematic illustration: insert in a left-hand SIL boring bar inside the workpiece bore. The insert is highlighted in gold.
One spindle revolution – 1.5 mm of feed
The workpiece rotates while the boring bar with the insert moves along the bore axis by 1.5 mm per spindle revolution. In a typical setup, the left-hand insert feeds toward the chuck and cuts a left-hand thread. During the final passes, its side edges trim the crests to the bore diameter.
Schematic illustration of passes for an M20 × 1.5 thread. The lines show successive cutting edge positions.
Successive passes to an infeed depth of 0.87 mm
The insert reaches the total infeed depth of 0.87 mm in 5–11 passes; start with 8. The first pass removes the most material, and the final pass removes 0.05–0.08 mm. Use flank infeed at an angle of 29–30° to the radial direction: the insert then cuts mainly on one flank.
In a blind hole, make a relief groove at the end of the thread at least 1.6 mm wide and no shallower than the infeed depth.
Cutting speed for BMA grade
BMA is a submicron carbide grade with a PVD TiAlN coating for steels, stainless steels and cast iron. The speeds in the table apply to thread turning.
| 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 |
Spindle speed and feed for M20 × 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: M20 × 1.5 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 × 1.5
2385 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.
Calculate the helix angle β using tan β = P / (π × d), where P is the pitch and d is the thread diameter. For M20 × 1.5: 1.5 / (π × 20) = 0.024, giving β ≈ 1.37°. Standard threading holder shims tilt the insert by 1–1.5°, so they do not need to be replaced for this thread.
Internal threads with a pitch of 1.5 mm – from M18 × 1.5 to M150 × 1.5
One insert, many diameters with the same pitch
Hole diameters shown at the same scale. The tooth profile and thread depth are the same for each.
The pitch and tooth profile do not depend on diameter. The infeed depth for an internal thread with a pitch of 1.5 mm is always 0.87 mm, for both M18 × 1.5 and M80 × 1.5. The hole in the workpiece, rather than the insert, determines the thread diameter.
The 16 IL 1.5 ISO insert cuts every metric fine thread with a 1.5 mm pitch listed in the PN-ISO 261 table with a bore from Ø16 mm. The standard permits this pitch up to a diameter of 150 mm. It reserves size M35 × 1.5 exclusively for bearing locknuts. Smaller threads with this pitch, up to M17, have a bore smaller than Ø16 mm and require a smaller insert.
| Group according to PN-ISO 261 | Internal thread sizes with a pitch of 1.5 mm |
|---|---|
| Fine threads – preference 1use as the first choice | M20M24M30M36M42M48M56M64M72M80× 1.5 |
| Fine threads – preference 2when the size is unavailable in preference 1 | M18M22M27M33M39M45M52M60M68M76× 1.5 |
| Fine threads – preference 3when the size is unavailable in preferences 1 and 2 | M25M26M28M32M35M38M40M50M55M58M62M65M70M75× 1.5 |
| Above M80diameters up to 150 mm | 1.5 mm pitch up to a diameter of 150 mm |
M20 × 1.5 is highlighted in gold – the thread shown in the drawings and calculation example in this description.
Decoding 16 IL 1.5 ISO – element by element
Size, operating hand, pitch, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
Dimensions of the 16 IL 1.5 ISO insert
Size 16 denotes 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 = 0.8 mm and Y = 1.0 mm specify the position of the cutting tip relative to the sides of the insert. The corner reproduces the ISO internal thread profile: a 60° angle, a root width of 1/8 of the pitch and a crest width of 1/4 of the pitch in the nominal profile.
16
Insert size
Edge 16 mm, IC 9.525 mm.
I
Internal thread
Turning inside holes with a boring bar.
L
Left-hand version
SIL boring bar, feeding toward the chuck.
1.5
Thread pitch
1.5 mm; one insert for one pitch.
ISO
Metric profile
Angle 60°, full profile, class 6H.
BMA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Only for a pitch of 1.5 mm and internal threads
The insert profile fits only one pitch. At a different feed, the insert flanks will not align with the thread flanks, producing a distorted thread. A boring bar for size 16 inserts fits holes from Ø16 mm – this determines the smallest thread.
Mount the threading insert in left-hand SIL boring bars for size 16 inserts, such as SIL 0013 M16, SIL 0016 P16 or SIL 0020 P16. A left-hand internal insert works only in a left-hand boring bar.
The 16 IL 1.5 ISO BMA internal metric threading insert finishes an internal thread with a 1.5 mm pitch, including the crests, without a separate finish-boring operation. A single insert cuts more than 30 sizes listed in the standard's table, from M18 × 1.5 to M80 × 1.5, always with the same infeed depth of 0.87 mm. It is suitable for production runs that require a repeatable profile.
16 IL 1.5 ISO – selection and application questions
Key information before selecting an insert
You can cut all internal metric threads with a pitch of 1.5 mm and a hole diameter from Ø16 mm: metric fine threads listed in the PN-ISO 261 table from M18 × 1.5 to M80 × 1.5. The standard permits a pitch of 1.5 mm up to a diameter of 150 mm.
Yes. The full profile trims the thread crests to the hole diameter, e.g. to 18.376–18.676 mm for M20 × 1.5 in the 6H tolerance zone. Simply bore the hole slightly undersize beforehand.
The total insert infeed depth for an internal thread is approx. 0.58 × P, or approx. 0.87 mm for a pitch of 1.5 mm. It is the same for every diameter with this pitch.
Left-hand SIL boring bars for size 16 inserts, such as SIL 0013 M16 (bores from Ø16 mm), SIL 0016 P16 (from Ø19 mm), SIL 0020 P16 (from Ø24 mm) or SIL 0025 R16 (from Ø29 mm).
Usually 5 to 11 passes; start with 8. For harder materials, add passes instead of increasing the cutting speed.
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