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Types of Threads
ISO METRIC SCREW THREADS
SPECIFICATION:
Basic dimensions :
 Gauging Practice :
IS 4218 Part III - 1999
 IS 2334 - 2001
IS 4218 Part IV - 2001
 ISO 1502 : 1996
ISO 724 : 1993
 B.S. 919 Part III : 1968
B.S. 3643 : Part I & II - 1981
 JIS B0251 - 1978
JIS B0205 Part I,II,III & IV - 2001
 DIN 2282 Part I - 2000, Part II- 2001, Part III- 2001
DIN 13 Part 12 - 1975
 DIN 2285 Part I - 1975, DIN 2299 Part I - 1989
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
These threads are used for general pupose fasteners.
 THREAD PLUG GAUGE : Diameter 1mm to 350mm
THREAD RING GAUGE : Diameter 1.2mm to 350mm
 
UNIFIED INCH SCREW THREAD FORM
(UN AND UNR THREAD FORM)
SPECIFICATION:
Basic dimensions :
 Gauging Practice :
ANSI B1.1 - 1982
ANSI B1.2 - 1983
B.S. 1580 Part I & II - 1962
B.S. 919 Part I - 1960
B.S. 1580 Part III - 1965 B.S. 919 Part IV - 1964
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
The Unified Coarse thread series (UNC/UNRC) is used for the bulk production of screws, bolts and nuts. It is commanly used in relative low strength materials such as cast iron, aluminium, magnesium, brass, bronze and plastic because the coarse threads provide more resistance to internal thread stripping than the fine or extra fine series. The fine thread series (UNF/UNRF) is commonly used for bolts and nuts in high strength applications. Fine series threads allows for finer adjustment in cases such as slotted nut and cotter pin assembly.

The extra-fine series (UNEF/UNREF) is used particularly for equipment and threaded
parts which require fine adjustments, such as bearing retaining nuts, adjusting screws,
etc. and for thin wall tubing and thin nuts. 		THREAD PLUG GAUGE : No.0 to 14"

THREAD RING GAUGE : No.0 to 14"
 
PIPE THREADS, WHERE PRESSURE-TIGHT JOINTS ARE NOT MADE ON THREADS ( `G' THREADS)
SPECIFICATION:
Basic dimensions :
 Gauging Practice :
ISO 228 / 1 : 2000
ISO 228 / 2 : 1987 (E)
IS 2643 (Part 1 to 3) : 1999
IS 10216 : 1988
DIN ISO 228 Part I - 1985
DIN ISO 228 Part II - 1988
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
These threads are used for mechanical assembly, of the component parts of fittings, cocks and valves, accessories etc.

THREAD PLUG GAUGE : Size 1/16" to 6"

THREAD RING GAUGE : Size 1/16" to 6"
 
PIPE THREADS WHERE PRESSURE-TIGHT JOINTS ARE MADE ON THREADS
SPECIFICATION:
Basic dimensions :
 Gauging Practice :
IS 554 - 1999
IS 8999 - 2003
B.S. 21 - 1985
B.S.21 - 1985
ISO 7 / 1 - 1994 (E)
ISO 7/2 - 1982 (E)
DIN 2999 - 1960 DIN 2999 Sheet 2 & 3-1973, Sheet 4 & 5-1975
APPLICATION :
 RANGE :
These threads are intended for tubes suitable for screwing, and for cocks, valves and any fittings to be connected to screwed tubes. If necessary, an appropriate jointing medium may be used on the thread to ensure pressure tight joints.

 THREAD PLUG GAUGE : Size 1/16" to 6"

THREAD RING GAUGE : Size 1/16" to 6"
 
PIPE THREADS, GENERAL PURPOSE (INCH) NPT
SPECIFICATION:
Basic dimensions :
ANSI / ASME B1.20.1 - 1983
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
Where pressure-tight joints are required, it is intended that taper pipe threads confirming
to this standard be made up wrench-tight with a sealant.
To prevent galling on certain piping materials such as stainless steels, the sealant usually contains lubricant. 		THREAD PLUG GAUGE : Size 1/16" to 12"

THREAD RING GAUGE : 1/16" to 12"
 
AMERICAN NATIONAL DRYSEAL PIPE THREADS
NPTF
SPECIFICATION:
Basic dimensions :
 Gauging Practice :
ANSI B1.20.3 - 1976
 ANSI B1.20.5 - 1991
APPLICATION :
Dryseal pipe threads are designed to seal pressure tight joints without the necessity of
using sealing compounds.
1. NPTF :-
This type applies to both external and internal threads & is suitable for pipe joints
in practically every type of service.

2. PTF-SAE short :-
External threads of these types are designed for applications where clearance is not sufficient for the full thread length of NPTF threads.
Internal threads of these types are designed for thin materials where thickness is not sufficient for the full thread length of NPTF threads.
3. NPSF :-
These are straight threads and internal only. These are generally used with soft or ductile materials which will tend to adjust at assembly to the taper of external threads, but may be used in hard or brittle materials where the section is thick.
4. NPSI :-
These are straight threads and internal only & slightly larger in diameter than NPSF threads. These may be used in hard or brittle materials where the section is thick or where there is a little expansion at assembly with external taper threads.
GAUGES FOR NPTF THREADS - TYPES OF GAUGES:
NPTF
RING GAUGE
 PLUG GAUGE
L1 Ring Gauge - Basic Step
L1 Ring Gauge - 3-Step
L2 Ring Gauge - Basic Step
L2 Ring Gauge - 3-Step
6-Step Crest Ring Gauge
6-Step Root Ring Gauge
 L1 Plug Gauge - Basic Step
L1 Plug Gauge - 3-Step
L3 Plug Gauge - Basic Step
L3 Plug Gauge - 3-Step
6-Step Crest Plug Gauge
6-Step Root Plug Gauge
PTF-SAE
RING GAUGE
 PLUG GAUGE
L1 Short Ring Gauge - 3-Step
L2 Short Ring Gauge - 3-Step		 L1 Short Plug Gauge - 3-Step
L2 Short Plug Gauge - 3-Step
NPSF NPSI
L1 Short Plug Gauge - 3-Step L1 Plug Gauge - 3-Step
MASTER GAUGES
  
Ring for L1 & L3 Taper Plug
Ring for 6-Step crest plug
Ring for 6-Step root plug
 Plug for L1 & L2 Taper Ring
Plug for 6-Step crest ring
Plug for 6-Step root ring
RANGE
THREAD PLUG GAUGE : Size 1/16" to 3"
THREAD RING GAUGE : Size 1/16" to 3"
 
PIPE THREADS,TAPER, AERONAUTICAL NATIONAL FORM ANPT
ANPT
SPECIFICATION:
MIL-P-7105 B
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
These threads are used for Aeronautical Industries.
 THREAD PLUG GAUGE & 6-STEP CREST PLUG GAUGE : Size 1/16" to 3"

THREAD RING GAUGE & 6-STEP CREST RING GAUGE : Size 1/16" to 3"
 
TAPER THREADS OF GAS CYLINDER VALVES
NGT
SPECIFICATION:
Basic dimensions :
 Gauging Dimensions :
IS : 3224 - 1979


 IS : 9121-1979 for size 3/4"-14 NGT
IS : 9687-1980 for size 1/2"-14 NGT
ISI MARK CERTIFICATION HAS GRANTED TO US WITH LICENCE No. CM/L - 1441641
FOR SIZE 3/4"-14 NGT.
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
These taper threads are used on valve stems and in the cylinder necks of valve fittings.
THREAD PLUG GAUGE : Size 3/4" & 1/2"
THREAD RING GAUGE : Size 3/4" & 1/2"
 
THREADS USED BY AMERICAN PETROLEUM INDUSTRIES
API
There are different types of threads used by American Petrolium Industries which are as follows,
 
1. Line Pipe threads
Range : Size 1/8" to 8" - Thread Plug & Ring Gauges

2. Round thread casing short and long
Range : Size 4 1/2" to 9 5/8" - Thread Plug & Ring Gauges

3. Buttress thread casing
Range : Size 4 1/2" to 9 5/8" - Thread Plug & Ring Gauges

4. Non-upset tubing threads
Range : Size 1.050" to 4 1/2" - Thread Plug & Ring Gauges

5. External upset tubing threads
Range : Size 1.050" to 4 1/2" - Thread Plug & Ring Gauges
The gauges used to test the above threads consists of working plug and working ring gauges. Certified Master plug and master ring gauges are required to check the above working gauges.
 
ACME THREADS
SPECIFICATION:
ANSI B1.5 - 1988
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
Acme screw threads are mainly used for the purpose of producing traversing motions
on machines , tools etc. The multi-start threads are used to provide fast relative traversing motion.		 THREAD PLUG GAUGE : Size 1/4" to 5"
THREAD RING GAUGE : Size 1/4" to 5"
 
STUB ACME THREADS
SPECIFICATION:
ANSI B1.8 - 1988
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
The Stub Acme screw threads are generally confined to those unusual applications like transmission of power and motion where a coarse pitch thread of shallow depth is required due to mechanical or metalurgical considerations.
 THREAD PLUG GAUGE : Size 1/4" to 5"

THREAD RING GAUGE : Size 1/4" to 5"
 
TRAPEZOIDAL THREADS
SPECIFICATION:
Basic dimensions :
 Gauging Dimensions :
ISO 2901 : 1993 (E), ISO 2902 : 1977
ISO 2903 : 1993 (E)
IS 7008 Part I & IV : 1999, Part II & III : 1988
 DIN 103 (Part 9) : 1985
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
For transmission of power & motion. THREAD PLUG GAUGE : Diameter 8mm to 300mm

THREAD RING GAUGE : Diameter 8mm to 300mm
 
BUTTRESS INCH SCREW THREADS
(7°/ 45° FORM WITH 0.6P BASIC HEIGHT OF THREAD ENGAGEMENT)
SPECIFICATION:
ANSI B1.9 - 1973
B.S. 1657 - 1950
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
The buttress thread form has certain advantages in applications involving exceptionally high stresses along the thread axis in one direction only.

The few applications are the breech assemblies of large guns, airplane propeller hubs, and columns for hydraulic presses.
 THREAD PLUG GAUGE : Size 1/2" to 12"

THREAD RING GAUGE : Size 1/2" to 12"

 
 
STEEL CONDUIT THREAD, Pg (80°)
SPECIFICATION:
Basic dimensions :
 Gauging Dimensions :
DIN 40430 - 1941
 DIN 40431 Part I - 1970
BASIC THREAD PROFILE:
RANGE :
THREAD PLUG GAUGE : Size Pg7 to Pg48

THREAD RING GAUGE : Size Pg7 to Pg48
 
PARALLEL SCREW THREADS OF WHITWORTH FORM
BSW, BSF
SPECIFICATION:
Basic dimensions :
 Gauging Dimensions :
B.S. 84 : 1956 B.S. 919 : Part 2 : 1971
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
These threads are used for general engineering purpose.
 THREAD PLUG GAUGE : Size 1/8" to 6"

THREAD RING GAUGE : Size 1/8" to 6"

 
CYCLE THREADS
SPECIFICATION:
Basic dimensions :
 Gauging Dimensions :
B.S. 811 : 1950
 B.S. 919 : Part 2 :1971
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
The form of thread is farmulated to provide a thread of suitable design and mechanical strength for bolts , nuts, nipples, spokes and other threaded parts of cycles and motor cycles. THREAD PLUG GAUGE : Size 1/8" to 3/4"

THREAD RING GAUGE : Size 1/8" to 3/4"
 
B.S. STEEL CONDUIT AND FITTINGS
SPECIFICATION:
B.S. 31 : 1940
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
These threads are used for electrical wiring. THREAD PLUG GAUGE : Size 0.5" to 2.5"

THREAD RING GAUGE : Size 0.5" to 2.5"
 
BOLTED CONNECTIONS WITH REDUCED SHANK, METRIC THREAD WITH LARGE CLEARANCE
(Note : Nut threads according to DIN 13, Class 6H)
SPECIFICATION:
Basic dimensions :
 Gauging Dimensions :
DIN 2510 (Part 1 to 8)
 DIN 13
APPLICATION :
 RANGE :
The threads according to this standard corresponds with the Metric ISO thread to DIN 13. Larger basic allowances are provided for the bolt thread in order to
ensure the minimum flank clearance needed for bolted connections with reduced shank.		 THREAD RING GAUGE : Size M12 to M180

 
 
THE TAPPING OF HOLES TO RECEIVE WIRE THREAD INSERTS
(HELICOIL)
SPECIFICATION:
B.S.4377 : 1977
[ For ISO Metric Threads ]
B.S.3409 Part I - 1961 & B.S. 3409 Part II - 1966
[ For Unified Threads ]
BASIC THREAD PROFILE:
APPLICATION :
 RANGE :
The use of wire thread inserts by many industries has grown rapidly in recent years. The main purpose is to provide a wear resisting fastening in light alloys and similar materials.Their application is mainly for example , inserts may be called upon to meet
design requirements or they may be used for purposes of salvage and repair.		 THREAD PLUG GAUGE : M2.5 TO M39
THREAD PLUG GAUGE : No.2 TO 1 1/2"
 
MILD STEEL TUBES AND TUBULARS
SPECIFICATION:
IS 1239 Part I - 2004
IS 1239 Part II - 1992
APPLICATION :
 RANGE :
This standard covers the requirement of butt welded, seamless, screwed and socketed mild steel tubes, suitable for screwing to pipe threads confirming to IS 554-1999,
Specification for pipe threads for gas list tubes and screwed fittings.
Sockets shall be capable of withstanding the expansion test with steel plugs having thread form and angle of taper in accordance with IS 554 : 1999
 THREAD PLUG GAUGE : Diameter 6mm to 150mm
 
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