TACO = T {Transparency}, A {Accountability}, C {Consistency}, O {Originality},
Chaser Set
Coventry Chaser Set For Stationary Self Opening Die Heads SDH & Revolving / Stationary Die Heads SD
Coventry Chaser For Die-Heads: SDH & SD
📌 Purpose:
The SD/SDH Coventry Diehead
Chasers are designed to deliver precise, high-quality external threading
across a wide range of metric and imperial sizes. They ensure smooth cutting,
consistent accuracy, and long tool life when used with stationary or revolving
self-opening die heads.
🏗️ Machine Compatibility:
Model Coventry Chaser Set
can be seamlessly mounted on:
v SDH
v SD
🛠️ Coventry Diehead Chaser Set Technical
Data
|
Diehead |
Size |
Capacity (Metric / Inch) |
Matching Metric Threads |
Chaser Set, Approx Weight (Kg.) |
|
SDH-1 / SD-1 |
5/16” |
2–8 mm / 3/32"–5/16" |
M2×0.4, M3×0.5, M4×0.7, M5×0.8, M6×1, M7×1, M8×1.25 |
0.040 Kg. |
|
SDH-2 / SD-2 |
1/2” |
4–14 mm / 3/16"–9/16" |
M4×0.7, M5×0.8, M6×1, M7×1, M8×1.25, M10×1.5, M12×1.75, M14×2 |
0.080 Kg. |
|
SDH-3 / SD-3 |
3/4” |
6–18 mm / 1/4"–3/4" |
M6×1, M7×1, M8×1.25, M10×1.5, M12×1.75, M14×2, M16×2, M18×2.5 |
0.150 Kg. |
|
SDH-4 / SD-4 |
1” |
10–24 mm / 3/8"–1" |
M10×1.5, M12×1.75, M14×2, M16×2, M18×2.5, M20×2.5, M22×2.5, M24×3 |
0.250 Kg. |
|
SDH-5 / SD-5 |
1-1/4” |
12–30 mm / 1/2"–1-1/4" |
M12×1.75, M14×2, M16×2, M18×2.5, M20×2.5, M22×2.5, M24×3, M27×3, M30×3.5 |
0.400 Kg. |
📝 Important Ordering Note: When
placing an order for Coventry Chasers, please specify the required
diehead model, shank size, and thread pitch for precise compatibility with
your application. [ Example Format: SDH-3 / SD-3 : 3/4” Coventry Chaser
– Metric Thread M18 × 2.5 ], [ Standard Production Range : We primarily
manufacture Metric Coventry Chasers for MS (Mild Steel) material
across the following models SD-2 / SDH-2 to SD-4 / SDH-4 ],
Special Orders : Minimum Order Quantity (MOQ): 10 – 20 Sets : Chasers outside our standard production including :- (1). Threads other than Metric (e.g., UNC, BSP, NPT), (2). Materials other than MS (e.g., Steel, Aluminium), (3). Non-standard sizes or designs (e.g., M12×2, M12×1.5), ]
Engineered for reliability, speed, and precision in high-performance threading operations.
🤖 Smart Function:
|
🧭
Function |
📖
Description |
🎯
Benefit |
|
📐
Wide Thread Range |
Available in multiple
capacities (5/16", 1/2", 3/4", 1", 1-1/4") covering
metric & imperial threads |
Provides flexibility
to cut diverse thread sizes with one system |
|
🧰
Universal Diehead Fit |
Designed for SD/SDH Coventry
Dieheads (stationary & revolving) |
Ensures compatibility across
different die-head models |
|
🛡️
Precision-Ground Cutting Edges |
Manufactured with
close tolerances and rigid geometry |
Delivers accurate
threads, reduces vibration, and improves surface finish |
|
🔁
Bidirectional Threading |
Supports right-hand and
left-hand threads with dedicated chasers |
Expands threading capability for
varied applications |
|
🧪
Material Compatibility |
Suitable for MS, CI,
low carbon steel, aluminum, copper, and steel (up to 20 HRC hardness) |
Ensures reliable
threading across common industrial metals |
|
⚙️
High-Performance Threading |
Engineered for smooth cutting
and chip clearance |
Improves thread quality and
extends tool life |
|
🔄
Quick Changeover |
Chasers can be swapped
easily for different thread sizes |
Minimizes downtime and
boosts productivity |
|
🎯
Consistent Accuracy |
Maintains uniform thread profile
across production runs |
Enhances repeatability and
reduces rejection rates |
|
🧲
Stable Seating |
Designed to fit
securely in die-head slots |
Prevents misalignment
and ensures safe operation |
|
💲
Cost Efficiency |
One diehead accommodates
multiple chaser sets |
Reduces tooling inventory and
overall threading costs |
🔑 Key Advantages:
🛠️ What Is a Coventry
Diehead Chaser?
v Threading
Tool System: Originally developed by Alfred Herbert, Coventry dieheads are
specialized tools used for cutting external threads on cylindrical components.
v Chasers:
These are the replaceable cutting inserts that fit into the diehead. They come
in sets and are precision-ground to match specific thread profiles.
v Automatic
Operation: The diehead opens automatically after completing a thread cut,
making it ideal for high-volume production.
🔧 How It Works
v Chamfer
& First Tooth Cutting: The cutting action begins at the chamfer and
first full tooth, while the remaining teeth guide the thread pitch like a nut.
v Self-Guiding:
Non-cutting teeth ensure accurate pitch and alignment.
v Quick
Changeover: Chasers can be swapped easily to change thread sizes or types,
minimizing downtime.
📐 Thread Types Supported
Coventry chasers are available
for a wide range of thread standards:
v Metric
(M)
v Unified
(UNC, UNF, UNEF)
v British
(BSW, BSF, BSP, BSPT)
v American
(NPT)
v Special
threads like BA, ME, BSCY, BSB, and more
🧰 Where They're Used
v Turret
lathes
v CNC
machines
v Automatic
screw machines
v Ideal
for batch production and continuous threading operations
🌟 Why They're Still
Popular
v Durability:
Made from high-speed steel and built to last.
v Precision:
Excellent thread quality and pitch accuracy.
v Versatility:
Can be used across various machines and materials.
Legacy & Support:
Namco Tooling now holds the original manufacturing specs and offers full
support for Coventry chasers
⚡️Quick & Easy Installation – Installation Guide for SD/SDH
Coventry Diehead Chasers
🔧 Mounting & Setup
v Diehead
Placement: Insert the die-head into the tailstock or carriage of a lathe.
Secure the workpiece in a chuck.
v Right-Hand
Threading: Chasers numbered 1 to 4 are arranged clockwise in
their designated slots. Fix in place with the cover plate.
v Left-Hand
Threading: Chasers numbered 1 to 4 are arranged counterclockwise
in their slots and held by the same cover plate.
🔄 Chaser Replacement
v Removing
Chasers:
- Loosen the four screws on the cover plate.
- Rotate the cover plate counterclockwise to
remove.
🔒 Diehead Closing
Procedure
v Close
the head:
- Rotate the front handles counterclockwise until the locking pin clicks into its seat.
📐 Technical Operating Range:
v Threading
Speed: Recommended threading speed: 100–600 RPM, depending on
material hardness, thread size/pitch, and chaser condition. (Always use
coolant for finish-grade threads and longer tap life.)
v Material
Hardness: 0–20 HRC
v Maximum Threading Length: Offers unlimited threading lengths on horizontal lathes, while supporting short-length threading applications on vertical drilling machines, milling machines, CNC, and VMC setups.
🛠️ Maintenance Note:
To ensure consistent threading accuracy and extended tool
life, SD/SDH Coventry Diehead Chasers should be:
v 🔧 Kept Clean & Sharp:
Regularly inspect and clean chasers to prevent chip buildup and dull edges.
v 💧 Use Proper Coolant:
Always apply cutting fluid during operation to reduce wear and improve finish.
v 📐 Check Seating & Alignment:
Ensure chasers are correctly seated in the die head for uniform thread cutting.
v 🔄 Rotate Usage: Alternate
between sets in heavy-duty production to avoid premature wear.
v 🛡️ Trial Verification: Perform a trial cut after installation to confirm thread size and accuracy.
🔩 Chaser Thread Standards
|
Thread |
Full Form |
Description |
|
NPT |
National Pipe Taper |
Tapered thread used in
U.S. pipe fittings. Creates a seal via thread interference. |
|
BSP |
British Standard Pipe |
Common in Europe and Asia.
Includes BSPT (tapered) and BSPP (parallel) threads. |
|
BSW |
British Standard
Whitworth |
Coarse thread with
rounded crests and roots. Used in older British machinery. |
|
UNF |
Unified National Fine |
Fine-pitch thread used in
precision applications. Part of the Unified Thread Standard. |
|
UNC |
Unified National
Coarse |
Coarse-pitch thread
for general fastening. Also part of the Unified Thread Standard. |
|
Metric |
ISO Metric Thread |
International standard. Uses
millimeter-based pitch and diameter. |
🧰 Where They're Commonly Used
v NPT:
Plumbing, gas lines, hydraulic systems (mostly in North America)
v BSP:
Water and fluid systems (Europe, Asia, Australia)
v BSW:
Restoration, vintage British equipment
v UNF/UNC:
Automotive, aerospace, general engineering (U.S. and Canada)
v Metric:
Global standard for bolts, screws, and fasteners
🔩 ISO Metric External Thread Dimensions (M1–M100)
|
Thread Size |
Pitch (mm) |
Major Dia. (Max/Min) |
Pitch Dia. (Max/Min) |
Minor Dia. (Max/Min) |
Suitable TACO Die Heads |
|
M1 x 0.25 |
0.25 |
0.981 / 0.886 |
0.821 / 0.754 |
0.648 / 0.508 |
|
|
M2 x 0.4 |
0.4 |
1.981 / 1.886 |
1.721 / 1.654 |
1.548 / 1.408 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} |
|
M3 x 0.5 |
0.5 |
2.980 / 2.874 |
2.655 / 2.580 |
2.438 / 2.272 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} |
|
M4 x 0.7 |
0.7 |
3.978 / 3.838 |
3.523 / 3.433 |
3.220 / 3.002 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} |
|
M5 x 0.8 |
0.8 |
4.976 / 4.826 |
4.456 / 4.361 |
4.110 / 3.868 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} |
|
M6 x 1.0 |
1.0 |
5.974 / 5.794 |
5.324 / 5.212 |
4.891 / 4.596 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} |
|
M7 x 1.0 |
1.0 |
6.794 – 6.974 |
6.212 – 6.324 |
~5.917 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} |
|
M8 x 1.25 |
1.25 |
7.972 / 7.760 |
7.160 / 7.042 |
6.619 / 6.272 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} |
|
M10 x 1.5 |
1.5 |
9.968 / 9.732 |
8.994 / 8.862 |
8.344 / 7.938 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”}, { DR - 3/8”, 9/16”, 13/16”, 1”, 1-1/16, DRF - 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, DRFSA - 13/16”, 1”} |
|
M12 x 1.75 |
1.75 |
11.966 / 11.701 |
10.829 / 10.679 |
10.071 / 9.601 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8” DRFSA - 13/16”, 1” 1-5/8”} |
|
M14 x 2.0 |
2.0 |
13.682 – 13.962 |
12.503 – 12.663 |
~11.835 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8” DRFSA - 13/16”, 1” 1-5/8”} |
|
M16 x 2.0 |
2.0 |
15.962 / 15.682 |
14.663 / 14.483 |
13.797 / 13.251 |
{SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} |
|
M18 x 2.5 |
2.5 |
17.682 – 17.962 |
16.503 – 16.663 |
~15.835 |
{SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} |
|
M20 x 2.5 |
2.5 |
19.920 / 19.320 |
16.023 / 15.743 |
13.425 / 12.047 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} |
|
M22 x 2.5 |
2.5 |
21.623 – 21.958 |
20.164 – 20.334 |
18.624 – 19.252 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1-1/16, 1-5/8”, 2” DRF - 1-5/8”, DRSA - 1-1/16, 1-5/8” DRFSA - 1-5/8”} |
|
M24 x 3.0 |
3.0 |
23.920 / 23.320 |
20.023 / 19.743 |
17.425 / 16.047 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1-1/16, 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-1/16, 1-5/8” DRFSA - 1-5/8”} |
|
M26 x 1.5 |
1.5 |
25.732 – 25.968 |
24.844 – 24.994 |
23.920 – 24.344 |
{SDH5, SD5 – 1-1/4”}, { DR - 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-5/8” DRFSA - 1-5/8” 2-3/8”,} |
|
M27 x 3.0 |
3.0 |
26.577 – 26.952 |
24.803 – 25.003 |
22.955 – 23.704 |
{SDH5, SD5 – 1-1/4”}, { DR - 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-5/8” DRFSA - 1-5/8”, 2-3/8”,} |
|
M28 x 1.5 |
1.5 |
27.968 – 27.732 |
26.994 – 26.844 |
26.344 – 25.920 |
{SDH5, SD5 – 1-1/4”}, { DR - 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-5/8” DRFSA - 1-5/8”, 2-3/8”,} |
|
M30 x 3.5 |
3.5 |
29.920 / 29.320 |
26.023 / 25.743 |
23.425 / 22.047 |
{SDH5, SD5 – 1-1/4”}, { DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} |
|
M32 x 3.5 |
3.5 |
31.365 – 31.925 |
29.088 – 29.353 |
26.700 – 27.970 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} |
|
M34 x 3.5 |
3.5 |
33.365 – 33.925 |
31.088 – 31.353 |
28.700 – 29.970 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} |
|
M36 x 4.0 |
4.0 |
35.920 / 35.320 |
32.023 / 31.743 |
29.425 / 28.047 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} |
|
M40 x 4.0 |
4.0 |
39.365 – 39.925 |
37.088 – 37.353 |
34.700 – 35.970 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} |
|
M42 x 4.5 |
4.5 |
41.920 / 41.320 |
38.023 / 37.743 |
35.425 / 34.047 |
{ DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} |
|
M48 x 5.0 |
5.0 |
47.920 / 47.320 |
44.023 / 43.743 |
41.425 / 40.047 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} |
|
M56 x 5.5 |
5.5 |
55.920 / 55.320 |
52.023 / 51.743 |
49.425 / 48.047 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} |
|
M59 x 4.0 |
4.0 |
58.365 – 58.925 |
56.088 – 56.353 |
53.700 – 54.970 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} |
|
M60 x 5.5 |
5.5 |
59.365 – 59.925 |
56.088 – 56.353 |
52.700 – 53.971 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} |
|
M64 x 6.0 |
6.0 |
63.920 / 63.320 |
60.023 / 59.743 |
57.425 / 56.047 |
|
|
M65 x 6.0 |
6.0 |
64.920 – 64.320 |
61.023 – 60.743 |
58.425 – 57.047 |
|
|
M70 x 6.0 |
6.0 |
69.920 – 69.320 |
66.023 – 65.743 |
63.425 – 62.047 |
|
|
M75 x 6.0 |
6.0 |
74.920 – 74.320 |
71.023 – 70.743 |
68.425 – 67.047 |
|
|
M80 x 6.0 |
6.0 |
79.920 – 79.320 |
76.023 – 75.743 |
73.425 – 72.047 |
|
|
M85 x 6.0 |
6.0 |
84.920 – 84.320 |
81.023 – 80.743 |
78.425 – 77.047 |
|
|
M90 x 6.0 |
6.0 |
89.920 – 89.320 |
86.023 – 85.743 |
83.425 – 82.047 |
|
|
M95 x 6.0 |
6.0 |
94.920 – 94.320 |
91.023 – 90.723 |
88.425 – 87.027 |
|
|
M100 x 6.0 |
6.0 |
99.920 – 99.320 |
96.023 – 95.723 |
93.425 – 92.027 |
|
🔩 UNC External Thread Size Chart (#0 to 3″)
|
UNC Size |
Threads / Inch (TPI) |
Major Diameter (in) |
Pitch Diameter (in) |
Minor Diameter (in) |
Suitable TACO Die Heads |
|
#0 |
80 |
0.0600 |
0.0514 |
0.0442 |
|
|
#1 |
64 |
0.0730 |
0.0623 |
0.0538 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M2 |
|
#2 |
56 |
0.0860 |
0.0738 |
0.0642 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} |
|
#3 |
48 |
0.0990 |
0.0848 |
0.0734 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M2.5 |
|
#4 |
40 |
0.1120 |
0.0950 |
0.0814 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M3 |
|
#5 |
40 |
0.1250 |
0.1080 |
0.0944 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} |
|
#6 |
32 |
0.1380 |
0.1169 |
0.1000 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M3.5 |
|
#8 |
32 |
0.1640 |
0.1428 |
0.1259 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} M4 |
|
#10 |
24 |
0.1900 |
0.1619 |
0.1394 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} M5 |
|
#12 |
24 |
0.2160 |
0.1879 |
0.1654 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} |
|
1/4″ |
20 |
0.2500 |
0.2164 |
0.1894 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} M6 |
|
5/16″ |
18 |
0.3125 |
0.2752 |
0.2452 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} M8 |
|
3/8″ |
16 |
0.3750 |
0.3331 |
0.2992 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”}, { DR - 3/8”, 9/16”, 13/16”, 1”, 1-1/16, DRF - 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, DRFSA - 13/16”, 1”} M10 |
|
7/16″ |
14 |
0.4375 |
0.3897 |
0.3511 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”}, { DR - 3/8”, 9/16”, 13/16”, 1”, 1-1/16, DRF - 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, DRFSA - 13/16”, 1”} M11 |
|
1/2″ |
13 |
0.5000 |
0.4485 |
0.4069 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8” DRFSA - 13/16”, 1” 1-5/8”} M12 |
|
9/16″ |
12 |
0.5625 |
0.5068 |
0.4617 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8” DRFSA - 13/16”, 1” 1-5/8”} M14 |
|
5/8″ |
11 |
0.6250 |
0.5644 |
0.5152 |
{SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} M16 |
|
3/4″ |
10 |
0.7500 |
0.6832 |
0.6291 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} M20 |
|
7/8″ |
9 |
0.8750 |
0.8009 |
0.7408 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1-1/16, 1-5/8”, 2” DRF - 1-5/8”, DRSA - 1-1/16, 1-5/8” DRFSA - 1-5/8”} M22 |
|
1″ |
8 |
1.0000 |
0.9168 |
0.8492 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1-1/16, 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-1/16, 1-5/8” DRFSA - 1-5/8”} M24 |
|
1 1/8″ |
7 |
1.1250 |
1.0300 |
0.9527 |
{SDH5, SD5 – 1-1/4”}, { DR - 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-5/8” DRFSA - 1-5/8”, 2-3/8”,} M27 |
|
1 1/4″ |
7 |
1.2500 |
1.1550 |
1.0777 |
{SDH5, SD5 – 1-1/4”}, { DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M30 |
|
1 3/8″ |
6 |
1.3750 |
1.2643 |
1.1742 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M33 |
|
1 1/2″ |
6 |
1.5000 |
1.3893 |
1.2992 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M36 |
|
1 3/4″ |
5 |
1.7500 |
1.6174 |
1.5092 |
{ DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M42 |
|
2″ |
4.5 |
2.0000 |
1.8528 |
1.7324 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} M48 |
|
2 1/4″ |
4.5 |
2.2500 |
2.1028 |
1.9824 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} M56 |
|
2 1/2″ |
4 |
2.5000 |
2.3345 |
2.1992 |
M64 |
|
2 3/4″ |
4 |
2.7500 |
2.5844 |
2.4491 |
M72 |
|
3″ |
4 |
3.0000 |
2.8344 |
2.6991 |
M76 |
🔩 UNF External Thread Size Chart (#0 to 3″)
|
UNF Size |
Threads / Inch (TPI) |
Major Diameter (in) |
Major Diameter (mm) |
Suitable TACO Die Heads |
|
#0 |
80 |
0.060 |
1.524 |
|
|
#1 |
72 |
0.073 |
1.854 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M2 |
|
#2 |
64 |
0.086 |
2.184 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} |
|
#3 |
56 |
0.099 |
2.515 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M2.5 |
|
#4 |
48 |
0.112 |
2.845 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M3 |
|
#5 |
44 |
0.125 |
3.175 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} |
|
#6 |
40 |
0.138 |
3.505 |
{SDH1, SD1 - 5/16”}, { DR - 5/16”} M3.5 |
|
#8 |
36 |
0.164 |
4.166 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} M4 |
|
#10 |
32 |
0.190 |
4.826 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} M5 |
|
#12 |
28 |
0.216 |
5.486 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”}, { DR - 5/16”, 3/8”} |
|
1/4″ |
28 |
0.250 |
6.350 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} M6 |
|
5/16″ |
24 |
0.313 |
7.938 |
{SDH1, SD1 - 5/16”, SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”}, { DR - 5/16”, 3/8”, 9/16”, 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, DRFSA - 13/16”, 1”} M8 |
|
3/8″ |
24 |
0.375 |
9.525 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”}, { DR - 3/8”, 9/16”, 13/16”, 1”, 1-1/16, DRF - 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, DRFSA - 13/16”, 1”} M10 |
|
7/16″ |
20 |
0.438 |
11.112 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”}, { DR - 3/8”, 9/16”, 13/16”, 1”, 1-1/16, DRF - 13/16”, 1”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, DRFSA - 13/16”, 1”} M11 |
|
1/2″ |
20 |
0.500 |
12.700 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8” DRFSA - 13/16”, 1” 1-5/8”} M12 |
|
9/16″ |
18 |
0.563 |
14.288 |
{SDH2, SD2 - 1/2”, SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 9/16”, 13/16”, 1”, 1-1/16, 1-5/8” DRFSA - 13/16”, 1” 1-5/8”} M14 |
|
5/8″ |
18 |
0.625 |
15.875 |
{SDH3, SD3 - 3/4”, SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} M16 |
|
3/4″ |
16 |
0.750 |
19.050 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1”, 1-1/16, 1-5/8”, 2” DRF - 13/16”, 1”, 1-5/8”, DRSA - 1”, 1-1/16, 1-5/8” DRFSA - 1” 1-5/8”} M20 |
|
7/8″ |
14 |
0.875 |
22.225 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1-1/16, 1-5/8”, 2” DRF - 1-5/8”, DRSA - 1-1/16, 1-5/8” DRFSA - 1-5/8”} M22 |
|
1″ |
12 |
1.000 |
25.400 |
{SDH4, SD4 - 1”, SDH5, SD5 – 1-1/4”}, { DR - 1-1/16, 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-1/16, 1-5/8” DRFSA - 1-5/8”} M24 |
|
1 1/8″ |
12 |
1.125 |
28.575 |
{SDH5, SD5 – 1-1/4”}, { DR - 1-5/8”, 2” DRF - 1-5/8”, 2-3/8”, DRSA - 1-5/8” DRFSA - 1-5/8”, 2-3/8”,} M27 |
|
1 1/4″ |
12 |
1.250 |
31.750 |
{SDH5, SD5 – 1-1/4”}, { DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M30 |
|
1 3/8″ |
12 |
1.375 |
34.925 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M33 |
|
1 1/2″ |
12 |
1.500 |
38.100 |
{ DR - 2” DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M36 |
|
1 3/4″ |
12 |
1.750 |
44.450 |
{ DRF - 1-5/8”, 2-3/8”, DRFSA - 2-3/8”,} M42 |
|
2″ |
12 |
2.000 |
50.800 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} M48 |
|
2 1/4″ |
12 |
2.250 |
57.150 |
{ DRF - 2-3/8”, DRFSA - 2-3/8”,} M56 |
|
2 1/2″ |
12 |
2.500 |
63.500 |
M64 |
|
2 3/4″ |
12 |
2.750 |
69.850 |
M72 |
|
3″ |
12 |
3.000 |
76.200 |
M76 |
TOOLS AND APPLIANCES CORPORATION
BLOCK NO.: 135/2, BILESHWARPURA, P.O. CHHATRAL - 382729,
TA. KALOL ( N.G.), DIST. GANDHINAGAR.
MO. 6355213404, 6355251586,
Email :- taco@imitoolsindia.com, salestaco@imitoolsindia.com.
