TNMA API

API THREADING
STYLE TNMA
INTERNAL AND EXTERNAL

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Uncoated Grades
ANSI CLASS AVERAGE GRAIN SIZE Grade
C-2 SUBMICRON 15 High strength carbide for low speed machining non-ferrous and high temperature alloys. Excellent for Milling, Turning or Grooving.
C-3 ULTRAFINE 16 For semi-finishing/finishing of non-ferrous alloys at high tempature and moderate speeds and chip loads.
C-2 FINE 18 A general purpose grade for machining cast iron, non-ferrous and high tempature alloys.
C-6 MEDIUM 55 A general purpose steel cutting grade for semifinishing at moderate to high speeds. Great for threading and grooving.
C-7 MEDIUM 65 A high titanium grade carbide for use when edge buildup is a problem and good cosmetics are required. Can be used at moderate to high speeds on carbon and alloy steels. Good for threading, grooving and profiling.
Coated Grades
ALUMINUM NITRIDE (PVD)
C-2 SUBMICRON ALN-200 A tough threading grade with superior edge strength. Suitable for steel as well as chrome and high tempature alloys.
C-3 ULTRAFINE ALN-202 Finishing and semi-finishing of high tempature alloys, threading, grooving on short chipping materials. Similar to ALN-200 except more abrasion resistant.
C-2 FINE ALN-205 Finishing grade for for high tempature alloys.
C-6 MEDIUM ALN-220 Finishing grade for steel
Titanium Nitride (PVD)
C-2 SUBMICRON TPN-100 Superior tough grade for threading steel when chip interference is a problem.
C-6 MEDIUM TPN-120 A general purpose steel cutting grade for finishing or semifinishing at moderate to high speeds. Great for threading, grooving and light interupted cuts.
Multi Coat (PVD)
C-2 SUBMICRON TAN-400 Our toughest threading grade with superior edge strength. Suitable for steel as well as chrome and high tempature alloys.
C-3 ULTRAFINE TAN-402 Finishing and semi-finishing of high tempature alloys, threading, grooving on short chipping materials. Similar to ALN-200 except more abrasion resistant.

Full-topping form;

*Catalog Number Casing Size Pitch Dimensions
I.C. Thk.
TNMA 55 V-0.038R 2 TPF NC-23 – NC-50 4 5/8 .312
TNMA 55 V-0.038R 3 TPF NC-56 – NC-77 4 5/8 .312
TNMA 55 V-0.040R 3 TPF 2-3/8 – 4-1/2 REG. 5 5/8 .250
TNMA 55 V-0.040R 3 TPF 2-3/8 – 4-1/2 REG. 5 5/8 .312
TNMA 55 V-0.050R 2 TPF 6-5/8 REG. 4 5/8 .312
TNMA 55 V-0.050R 3 TPF 5-1/2, 7-5/8 & 8-5/8 REG. 4 5/8 .312

*Specify internal or external when ordering.

Non-topping form for internal or external;

*Catalog Number Casing Size Pitch Dimensions
I.C. Thk.
TNMA 54 V-0.038R NC-23 – NC-77 4 5/8 .250
TNMA 54 V-0.040 2-3/8 – 4-1/2 REG. 5 5/8 .250
TNMA 54 V-0.050 5-1/2 – 8-5/8 REG. 4 5/8 .250

The following API connections having obsolete thread form V-0.065 are
interchangeable with the V-0.038 2 TPF thread form per API specification 7; 2-3/8 IF, 2-7/8 IF, 3-1/2 IF, 4 FH, 41F and 4-1/2 IF.
• For API thread forms other than shown please inquire.
• Certain API connections are interchangeable as follows; NC-26 and 2-
3/8 IF, NC-31 and 2-7/8 IF, NC-38 and 3-1/2 IF, NC-40 and 4 FH, NC-46
and 4 IF, NC-50 and 4-1/2 IF.

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