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Description
16 IR 1.75 ISO BMA internal metric threading insert
Technical data for the full-profile insert for 1.75 mm pitch
| Technical data | |
|---|---|
| Designation | 16 IR 1.75 ISO BMA |
| Brand / part number | Fanar / 0000010833 |
| Type | internal threading insert, right-hand |
| Profile | full, ISO metric, 60° angle |
| Pitch | 1.75 mm |
| Infeed depth | 1.01 mm |
| Thread tolerance class | 6H |
| Insert size | 16: edge 16 mm, IC 9.525 mm |
| Cutting edges | 3 |
| Tool holders | right-hand internal SIR, size 16, holes from Ø16 mm |
| Grade | BMA: submicron carbide, PVD TiAlN |
Pitch1.75 mm
Profilefull ISO
Infeed depth1.01 mm
Tool holdersSIR 16
16 IR 1.75 ISO BMA internal metric threading insert turns the full internal thread profile at a pitch of 1.75 mm: flanks, root, and crests. It is intended for threads with a 1.75 mm pitch in bores from Ø16 mm; threads with this pitch in the standard table have smaller bores. It operates in size 16 right-hand SIR boring bars. It has three corners for sequential use.
Full ISO profile – flanks, root and thread hole diameter
The insert finishes the thread crests in the same cycle
This insert
16 IR 1.75 ISO – full profile
Crests trimmed to diameter D1.
Comparison
Partial profile, e.g. 16 IR AG60
The crests remain as produced by boring the hole.
Axial section of a thread with a 1.75 mm pitch after the final pass. Gold highlights the insert; the red line indicates 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. 0.44 mm.
Calculate the bore for an internal thread using D1 = D − 1.0825 × P, where D is the thread diameter. For a diameter of 20 mm and a pitch of 1.75 mm, the result is D1 = 18.11 mm. Bore the hole slightly undersize beforehand. An oversized bore leaves the crests unmachined and produces a profile that is too shallow. Check the finished thread with a thread plug gauge or a screw.
This insert
16 IR 1.75 ISO full profile
The insert turns the flanks, root and crests of a thread with a 1.75 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 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.
How the 16 IR 1.75 ISO insert cuts threads – passes, feed and cutting data
Feed of 1.75 mm per revolution and 9–12 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 – 1.75 mm of feed
The workpiece rotates while the boring bar with the insert moves along the hole axis by 1.75 mm per spindle revolution. In a typical setup, the right-hand insert feeds toward the chuck and turns a right-hand thread. During the final passes, its side cutting edges trim the crests to the hole diameter.
Schematic illustration of passes for a thread with a 1.75 mm pitch. The lines show successive cutting edge positions.
Successive passes to an infeed depth of 1.01 mm
The insert reaches the total infeed depth of 1.01 mm in 9–12 passes; start with 10. 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 1.9 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 a thread with a diameter of 20 mm
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 = 1.75 mm/rev.
Example: an internal thread with a diameter of 20 mm and a pitch of 1.75 mm in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 20) ≈ 1590 rpm
vf = n × P = 1590 × 1.75
2782 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 a diameter of 20 mm: 1.75 / (π × 20) = 0.028, giving β ≈ 1.60°. 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 1.75 mm pitch – bores from Ø16 mm
The holder's minimum bore diameter determines the smallest thread
The bore for a thread with a 1.75 mm pitch is 1.89 mm smaller than the thread diameter. A boring bar for size 16 inserts fits bores from Ø16 mm, so the smallest thread has a diameter of approximately 17.9 mm. This thread is not listed in the standard table – it is a special thread with this pitch.
The pitch and tooth profile are independent of the diameter: the infeed depth is always 1.01 mm. The bore in the workpiece determines the thread diameter, rather than the insert.
Decoding the 16 IR 1.75 ISO designation – 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.
16 IR 1.75 ISO insert dimensions
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 = 0.9 mm and Y = 1.2 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.
R
Right-hand version
SIR boring bar, feed toward the chuck.
1.75
Thread pitch
1.75 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.
Threads in the standard table require a smaller bore
The thread in the PN-ISO 261 table with a 1.75 mm pitch (M12) has a bore of 10.11 mm. This is less than Ø16 mm – the minimum bore diameter for a boring bar using size 16 inserts. For these threads, select a miniature size 08 IR insert.
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. A right-hand internal insert works only in a right-hand boring bar.
The 16 IR 1.75 ISO BMA internal metric threading insert turns the full internal thread profile at a pitch of 1.75 mm in bores from Ø16 mm, always at the same infeed depth of 1.01 mm. It is suitable for threads with this pitch at larger diameters, including those outside the standard table.
16 IR 1.75 ISO – questions about selection and use
Key information before selecting an insert
The bore for a thread with a 1.75 mm pitch is 1.89 mm smaller than the thread diameter. A boring bar for size 16 inserts fits bores from Ø16 mm, so the smallest thread has a diameter of approximately 17.9 mm. This thread is not listed in the standard table – it is a special thread with this pitch. The thread in the PN-ISO 261 table with a 1.75 mm pitch (M12) has a bore of 10.11 mm.
Yes. The full profile trims the thread crests to the bore diameter. Simply bore the hole slightly undersize beforehand.
The total insert infeed depth for an internal thread is approx. 0.58 × P, or approx. 1.01 mm for a pitch of 1.75 mm. It is the same for every diameter with this pitch.
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).
Usually 9 to 12 passes; start with 10. For harder materials, add passes instead of increasing the cutting speed.
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