Screw Thread Types & Standards

Standard Description Thread Type
ASME B1.1 Unified Inch Screw Thread
(UNC, UNEF, UNF, UNR, UNS,
8-UN, 12-UN, 16-UN, 20-UN Threads Profile)
V Thread Form with Flank Angle 60°
ASME B1.5 Acme Screw Threads Trapezoidal Thread Form
ANSI/ASME B1.9 Buttress Inch Screw Threads Breech Lock Thread Form
ANSI/ASME B1.11 Microscope Objective Threads V Thread Form
ASME B1.13M Metric Screw Threads: M Profile V Thread Form
ASME B1.15 Unified Inch Screw Threads (UNJ Thread Form) V Thread Form
ASME B1.21M Metric Screw Threads - MJ profile V Thread Form
ISO 68-1 ISO general purpose screw threads-basic
profile-part 1 : metric screw threads
V Thread Form
ISO 68-2 ISO general purpose screw threads-basic
profile-part 2 inch screw threads
V Thread Form
ISO 261 Metric Screw Threads V Thread Form
ISO 262 Metric Screw Threads V Thread Form
ISO 724 ISO Metric Screw Threads in accordance to ISO 261 V Thread Form
ISO 725 ISO Inch Screw Threads in accordance to ISO 263 V Thread Form
DIN 13-1 ISO Metric Screw Threads for
Nominal Size 1MM to 68MM Diameter Coarse Pitch Threads
V Thread Form
DIN 13-2 ISO Metric Screw Threads for
Nominal Size Diameter from 1MM to 50MM with
0.2MM to 0.25MM and 0.35MM Fine Pitch Threads
V Thread Form
DIN 13-3 ISO Metric Screw Threads -
Nominal sizes from 3.5MM to 90MM with
0.5MM Fine Pitch Threads
V Thread Form
DIN 13-4 ISO Metric Screw Threads for
Nominal Size Diameter from 5MM to 110MM with
0.75MM Fine Pitch Threads
V Thread Form
DIN 13-5 ISO Metric Screw Threads for
Nominal Size Diameters from 7.5MM to 200MM with
1MM & 1.25MM Fine Pitch Threads
V Thread Form
DIN 13-6 ISO Metric Screw Threads for
Nominal Size Diameters from 12MM to 300MM with
1.5MM Fine Pitch Threads
V Thread Form
DIN 13-7 ISO Metric Screw Threads for
Nominal Size Diameter from 17MM to 300MM with
2MM Fine Pitch Threads
V Thread Form
DIN 13-8 ISO Metric Screw Threads for
Nominal Size Diameter from 28MM to 300MM with
3MM Fine Pitch Threads
V Thread Form
DIN 13-9 ISO Metric Screw Threads for
Nominal Size 1MM to 68MM with
Coarse Pitch Threads and Tolerance Classes
V Thread Form
DIN 13-10 ISO Metric Screw Threads for
Nominal Size from 70MM to 500MM with
6MM Fine Pitch Threads
V Thread Form
ANSI/ASME B1.8 Stub Acme Thread Profile Trapezoidal Thread Form
BS 84 Whitworth Inch Screw Fine Thread Profile
Superseded by UNF Thread Form
With Flank Angle 55°
BS 84 Whitworth Inch Screw Coarse Thread Profile With Flank Angle 55°
DIN 513 Buttress Metric Screw Fine Thread Profile Flank Angle 55°
DIN 514 Buttress Metric Screw Coarse Thread Profile Flank Angle 55°
DIN 103 Metric Fine Thread Profile Trapezoidal Thread Form with Flank Angle 30°
ISO 965 Tolerance for General Purpose Metric Screw Threads  
IS 4218 Part 2 General Purpose ISO Metric Screw Threads for
Nominal Diameter 1MM to 300MM
Equivalent to ISO 261
IS 4218 Part 4 General Purpose ISO Metric Screw Threads for
Nominal Diameter 1MM to 64MM
Equivalent to ISO 262
IS 14962 part 2 Tolerance for ISO Metric Screw Threads for
Nominal Diameter M1 to M64
Equivalent to ISO 965-2
IS 14962 part 5 Tolerance for ISO Metric Screw Threads for
Nominal Diameter M10 to M64
Equivalent to ISO 965-5

Note : This technical information is supplied as a courtesy by BoltPort. We do not undertake any responsibility for the accuracy of the data and its application on field. This is strictly for reference.