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Carbide insert inch threads TPI 48-8 coils 16 ER AG55 BMA Fanar

Insert 16 ER AG55 BMA Fanar

Name: Insert 16 ER AG55 BMA Fanar
Brand: Fanar Narzędzia
SKU: 17330
Price: 14.24 EUR
Availability: OutOfStock

Producer: Fanar Narzędzia

reference: 0000006938

Thread pitch: 48-8 coils3 sizes of this insert

7-5 coils 48-8 coils 48-16 coils

€14.24 tax inc.

Net price: €11.58

Brak w magazynie

Call and order: (44) 755-04-05

Description

16 ER AG55 BMA inch threading insert

Technical data for the partial-profile insert for threads from 48 to 8 threads per inch

Technical data
Designation	16 ER AG55 BMA
Type	external threading insert, right-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	right-hand external SER, size 16, alternatively left-hand internal SIL 16
Grade	BMA: submicron carbide, PVD TiAlN

Fanar 16 ER AG55 BMA inch threading insert, three corners with a 55° angle

Thread angle55°

Pitch range0.53–3.17 mm

Threads per inch48–8

Tool holdersSER 16

16 ER AG55 BMA inch threading insert turns 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 right-hand SER holders and, as an alternative, in left-hand SIL 16 boring bars. It has three corners: when an edge wears out, index the insert to the next corner.

How the 16 ER AG55 insert cuts threads – rotation, feed, and passes

Feed equal to the pitch and several progressively shallower passes

Thread turning with the 16 ER AG55 insert in a SER holder, feeding toward the lathe chuck

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., 1.814 mm for a G 1/2 thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-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.

Six successive passes of the 16 ER AG55 insert in a G 1/2 thread groove, using flank infeed

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 v_c [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: f_n = P = 1.814 mm/rev.

Example: G 1/2 in low-alloy steel, v_c = 100 m/min

n = 1000 × v_c / (π × d) = 1000 × 100 / (π × 20.955) ≈ 1520 rpm

v_f = n × P = 1520 × 1.814

2758 mm/min

feed rate

d – thread diameter (20.955 mm), n – spindle speed, v_c – cutting speed from the middle of the range in the table, v_f – feed rate.

Universal 55° profile – from 48 to 8 threads per inch

One profile angle, many pipe and Whitworth threads

G 1/8 thread with 28 threads per inch and the tip of the 16 ER AG55 insert

28 threads per inch – G 1/8

G 1/2 thread with 14 threads per inch and the tip of the 16 ER AG55 insert

14 threads per inch – G 1/2

BSW 1" thread with 8 threads per inch and the tip of a 16 ER AG55 insert with a 55° angle

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 ER 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 ER 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 ER 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 ER AG55 designation – element by element

Size, cutting hand, profile and grade in the insert designation, holder selection

Drawing of the 16 ER AG55 insert with dimensions L, IC, X, Y and a 55° corner with a 0.07 mm radius

Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.

Dimensions of the 16 ER 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.

Insert size

Edge 16 mm, IC 9.525 mm.

External thread

Turning on shafts and journals.

Right-hand version

SER holder, feed 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 right-hand external SER holders for size 16 inserts, e.g., SER 1616 H16, SER 2020 K16, or SER 2525 M16. The insert has the same shape as the left-hand internal 16 IL insert, so it can alternatively be mounted in a left-hand SIL 16 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 16 ER AG55 BMA inch threading insert covers threads from 48 to 8 threads per inch with a 55° angle in a single cutting edge. It is useful for short production runs of various G pipe and Whitworth threads. It requires the diameter to be prepared beforehand, but eliminates the need for a separate insert for each pitch.

16 ER AG55 – questions about selection and applications

Key information before selecting an insert

Which threads can I cut with the 16 ER AG55 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".

How should I prepare a shaft for threading with an AG55 insert?

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.

Which holders accept the 16 ER AG55 insert?

Right-hand external SER holders for size 16 inserts, e.g., SER 1616 H16, SER 2020 K16, SER 2525 M16, or SER 3232 P16. It has the same shape as the left-hand internal 16 IL insert, so it also fits left-hand SIL 16 boring bars as an alternative.

How many passes are needed for threading with an AG55 insert?

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.

What does the number 16 in the insert designation mean?

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 ER AG55 insert can cut both G 1/8 and G 2.

Product accessories

Carbide insert for metric threads 0.5-3 mm 16 ER BMA Fanar

Insert 16 ER AG60 BMA Fanar

Reference: 0000005491

€11.58

€14.24 brutto

Out of stock