Thread mills drastically reduce the occurrences of scrap when compared to taps, which makes them desirable when manufacturing large and/or costly components. AccuThread™ 856 are a premium thread milling product backed by Allied’s experienced technical staff. AccuThread™ 856 replaceable thread mills provide quality threads when compared to other thread making processes and allow for easy replacement of cutting edges.
Advantages
- Provides a 25-50% increase in tool life over the competition
- Increased strength and rigidity when cutting forces are applied
- Holders are engineered to dampen vibration
- Reduces tooling inventory cost
- No resharpening required
- The pin-style connection improves repeatability when changing inserts
Features
- Allied's proprietary AM210® coating
- Stainless steel holders
- Wide range of forms and pitches
- Imperial and metric shanks
- Offered in neutral and positive rake geometries
- Online programming
Recommended Materials
Steel
High Tem Alloy
Sainless Steel
Hardened Steel
Cast Iron 
Non-ferrous MaterialsRecommended Industries
Aerospace
Agriculture
Automotive
Renewable Energy/ Energy
General Production
Oil and Gas
MarineProduct Specifications
| Product Type | Inserted Thread Mill |
| Thread Form | NPT, NPTF, BSPT, BSPP, API, ACME, UN, UNJ, ISO |
| Shank Options | Flanged, Shell Mill |
| Coating | AM210® |
| Substrate Options | Carbide |
| Coolant | Coolant and Non-coolant |
| Geometry Options | Positive Rake, Neutral Rake |
Product Nomenclature
AccuThread™ 856 Indexable Insert Holders
| THP |
|---|
| 1 |
| - |
| 0400 |
|---|
| 2 |
| - |
| 1F |
|---|
| 3 |
| 075 |
|---|
| 4 |
| M |
|---|
| 5 |
| 1. Holder Style | |
|---|---|
|
THP = Weldon Positve Rake TNR = Weldon Neutral Rake TSN = Shell Mill Positve Rake TSR = Shell Mill Neutral Rake |
|
| 2. Length of Insert |
|---|
|
0400 = 0.400 |
| 3. Shank Designation | |
|---|---|
|
1F = 1 flute 2F = 2 flutes 3F = 3 flutes 5F = 5 flutes |
6F = 6 flutes 7F = 7 flutes 8F = 8 flutes
|
| 4. Length of Insert |
|---|
|
075 = 3/4 100 = 1.00 150 = 1.50 |
| 5. Shank Designation |
|---|
|
Blank = Inch M = Metric |
Reference Key
| Symbol | Atribute | Symbol | Atribute |
|---|---|---|---|
|
D1 D1* D2 D3 D4 |
Cutter diameter Oversized cutter diameter Shank diameter Pilot diameter Body diameter (Shell Mill) |
D5 L1 L6 L8 T2 |
Bore diameter (Shell Mill) Overall length Length of insert Flute length Slow width (Shell Mill) |
AccuThread™ 856 Indexable Inserts
| TN |
|---|
| 1 |
| 075 |
|---|
| 2 |
| K |
|---|
| 3 |
| - |
| UN |
|---|
| 4 |
| 32 |
|---|
| 5 |
| I |
|---|
| 6 |
| 1. Insert Style |
|---|
|
TN = Pin style |
| 2. Insert Length |
|---|
|
075 = 3/4 100 = 1.00 150 = 1.50 |
| 3. Coating |
|---|
|
K = AM210® A = TiAlN U = Uncoated |
| 4. Thread Class | |
|---|---|
|
UN = UN UNJ = UNJ NPT = NPT NPTF = NPTF BSPP = BSPP |
BSPT = BSPT M = ISO FA = Full ACME AP = API Round
|
| 5. Thread Pitch |
|---|
|
20 = UN 1.0 = ISO |
| 6. Thread Style |
|---|
|
I = Internal E = External |
Reference Key
| Symbol | Atribute |
|---|---|
L6 T1 |
Length of insert Insert thickness |
Recommended Cutting Data
AccuThread 856 Indexable Neutral Rake
|
|
|
AccuThread 856 Indexable Positive Rake
|
|
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