SP 42 : 2008 Survey of Screw Threads

ICS 21.040.01 PGD 37

Reaffirmed 2021

1 Scope

This standard lays down an overview of screw threadsused either for general purposes or in specialapplications. Threads complying with standards beinggiven in Table 1 and those complying with InternationalStandards in Table 2. In Table 3 types of screw threadscovered in National Standards of UK, USA andGermany are given.

2 Refereneces

The standards given below contain provisions, whichthrough reference in this text, constitute provisions ofthis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:

    IS No.       Title
IS 554 : 1999/
ISO 7-1 : 1994
Pipe threads where pressure-tight
joints are made on the threads -
Dimensions, tolerances and
designation (fourth revision)
IS 2186 : 1985 ISO metric external screw threads for
interference fit applications (first
revision)
IS 2643 : 2005/
ISO 228-1 :
2000
Pipe threads where pressure-tight
joints are not made on the threads -
Dimensions, tolerances and
designation (third revision)
IS 4218 ISO general purpose metric screw
threads:
IS Part 1 : 2001/
ISO 68-1 : 1998
Basic profile (second revision)
IS Part 2 : 2001/
ISO 261 : 1998
General plan (second revision)
IS Part 3 : 1999/
ISO 724 : 1993
Basic dimensions (second revision)
IS Part 4 : 2001/
ISO 262 : 1998
Selected sizes for screws, bolts and nuts
(second revision)
IS 4695 General purpose knuckle threads:
IS Part 1 : 2003 Profiles and nominal sites (second
revision)
IS Part 2 : 2003 Deviations and tolerances (second
revision)
IS 4696 Dimensions for metric buttress threads
IS Part 1 : 2004 Thread profile (second revision)
IS Part 2 : 2004 Pitch diameter combination (second
revision)
IS Part 3 : 2004 Basic dimensions (second revision)
IS Part 4 : 2005 Tolerancing system (second revision)
IS 5957 : 2003/
ISO 1478 :
1999
Screw threads for thread forming
tapping screws - Dimensions
(second revision)
IS 7008 ISO metric trapezoidal screw threads
IS Part 1 : 1999/
ISO 2901 : 1993
Basic profile and maximum material
profile (second revision)
IS Part 2 : 1988/
ISO 2902 : 1977
Pitch diameter combinations (first
revision)
IS Part 3 : 1988/
ISO 2904 : 1977
Basic dimensions (first revision)
IS Part 4 : 1999/
ISO 2903 : 1993
Tolerances (second revision)
IS 8788 : 2002 Dimensions for metric external taper
and internal parallel screw threads
(second revision)
IS 9449 Dimensions for tyre valve threads:
IS Part 1 : 1980 Threads 5V1, 5V2, 6V1 and 8 V1
IS Part 2 : 1985 Threads 9V1, 10V2 and 12V1
IS Part 3 : 1985 Threads, 10V1, 15V1, 17V1 and 20Vl
IS 10980 Specification for aerospace bolts and
IS Part 1 : 1984 nuts (MJ threads): Part 1 Basic profile
IS 11698 ISO Miniature screw threads:
IS Part 1 : 2004 Part 1 Basic profiles
Tolerances for ISO metric trapezoidal
screw threads for lead and feed screw
assemblies
IS 12818 : 1992 Unplasticized PVC screen and casing
pipes for basic/tubewell -
Specification (first revision)
IS 14962 ISO general purpose metric screw
threads - Tolerances:
IS Part 1 : 2001/
ISO 965-1 : 1998
Principles and basic data
IS Part 2 : 2001/
ISO 965-2 : 1995
Limits of sites for general purposes
external and internal screw threads
- Medium quality
IS Part 3 : 2001/
ISO 965-3 : 1998
Deviations for constructional screw
threads
IS Part 4 : 2001/
ISO 965-4 : 1998
Limits of sizes for hot-dip galvanized
external screw threads to mate with
internal screw threads tapped with
tolerance position H or G after
galvanizing
IS Part 5 : 2001/
ISO 965-5 : 1998
Limits of sizes for hot-dip galvanized
internal screw threads to mate with
external screw threads with
maximum size of tolerance position
h before galvanizing