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Description
Inch threading insert 16 EL AG55 BMA
Technical data for the partial-profile insert for threads from 48 to 8 threads per inch
| Technical data | |
|---|---|
| Designation | 16 EL AG55 BMA |
| Type | external threading insert, left-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 | size 16 left-hand SEL external holders, alternatively right-hand SIR 16 internal holders |
| Grade | BMA: submicron carbide, PVD TiAlN |
Thread angle55°
Pitch range0.53–3.17 mm
Threads per inch48–8
Tool holdersSEL 16
Inch threading insert 16 EL AG55 BMA cuts external threads with a 55° profile angle and 48 to 8 threads per inch. One insert can cut G pipe threads from G 1/16 to G 6 and BSW and BSF Whitworth threads within this range. It works in size 16 left-hand SEL holders and, as an alternative, in right-hand SIR 16 boring bars. It has three corners: when a cutting edge wears out, index the insert to the next corner.
How the 16 EL AG55 insert cuts threads – rotation, feed and passes
Feed equal to the pitch and several progressively shallower passes
Schematic: insert in a left-hand SEL holder in front of the lathe axis. The insert is highlighted in gold.
One spindle revolution – one thread pitch
The shaft rotates while the insert in the holder moves along its axis. For each spindle revolution, the travel is exactly one pitch, for example 1.814 mm for a G 1/2 thread. In a typical setup, the left-hand insert feeds toward the chuck and cuts a left-hand thread.
The AG55 insert does not touch the thread crests. They retain the diameter turned 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 profile 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 ring gauge or nut fits onto 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.
| 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 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 – G 1/8
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° angle. The insert can therefore cut G threads from G 1/16 to G 6, BSW threads from 1/4" to 1", and BSF threads from 1/4" to 7/8". For short production runs, this replaces several full-profile inserts, each suited to a single number of threads per inch.
| Threads per inch | 28 | 20 | 19 | 18 | 16 | 14 | 12 | 11 | 10 | 9 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| G pipe thread | G 1/16, G 1/8 | — | G 1/4, G 3/8 | — | — | 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 | — | 1/4" | — | 5/16" | 3/8" | 7/16" | 1/2" | 5/8" | 3/4" | 7/8" | 1" |
AG55 vs. a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 16 EL 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 EL 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 EL 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 turned diameter | turned together with the flanks |
| Shaft 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, including the crests, making it easier to maintain a consistent profile in production runs. AG55 leaves the crests at the diameter you turn. Its narrow corner also produces a sharper thread root than the Whitworth profile.
Thread diameter and root with an AG55 insert
Before threading, turn the major diameter to the thread dimension, e.g., G 1/2 in class A: 20.671–20.955 mm. The corner radius of 0.07 mm 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 the full profile is important, choose a W full-profile insert for the specified number of threads per inch.
Decoding the 16 EL AG55 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.
Dimensions of the 16 EL AG55 insert
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.
E
External thread
Turning on shafts and journals.
L
Left-hand version
SEL holder, feeding toward the chuck.
AG55
55° partial profile
From 48 to 8 threads per inch.
BMA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Mount the threading insert in left-hand SEL external holders for size 16 inserts, such as SEL 1616 H16, SEL 2020 K16 or SEL 2525 M16. The insert has the same shape as the 16 IR right-hand internal insert, so it can alternatively be mounted in a right-hand SIR 16 boring bar to cut an internal thread. Internal inserts are intended for regular use in holes. 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 16 EL AG55 BMA inch threading insert covers threads from 48 to 8 threads per inch with a 55° angle using a single cutting edge. It is useful for short runs of various G pipe threads and Whitworth threads. It requires the diameter to be prepared beforehand, but eliminates the need for a separate insert for each pitch.
16 EL AG55 – questions about selection and applications
Key information before selecting an insert
You can cut external threads with a 55° angle and 48 to 8 threads per inch: G pipe threads from G 1/16 to G 6, BSW Whitworth threads from 1/4" to 1", and BSF threads from 1/4" to 7/8".
Turn the major diameter to the thread dimension, e.g., G 1/2 in class A: 20.671–20.955 mm. The insert cuts the flanks and root, while the crests remain at this diameter.
Left-hand SEL external holders for size 16 inserts, such as SEL 1616 H16, SEL 2020 K16, SEL 2525 M16 or SEL 3232 P16. It has the same shape as the 16 IR right-hand internal insert, so it also fits right-hand SIR 16 boring bars 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 diameter of 9.525 mm (3/8 inch). The thread diameter is determined by the shaft being machined, so the 16 EL AG55 insert can cut both G 1/8 and G 2.
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