BS 1580-1:2007 - Unified screw threads. Screw threads with diameters ¼ in and larger. Requirements – BSI British Standards

BS 1580-1:2007

Unified screw threads. Screw threads with diameters ¼ in and larger. Requirements

Status : Confirmed, Current   Published : December 2007

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BS 1580-1 specifies limits of sizes, and tolerances, for single-start, clearance-fit unified screw threads, in inch units, with nominal diameters in and above, having the ISO basic profile as specified in BS ISO 68-2:1998.

BS 1580-1specifies the following unified thread series as follows:

a) standard variable pitch series:

  • a coarse thread series (UNC) from 1/4 in to 4 in nominal diameter
  • a fine thread series (UNF) from 1/4 in to 1 1/2 in nominal diameter
  • an extra fine thread series (UNEF) from 1/4 in to 1 1/16 in nominal diameter

b) standard constant pitch series:

  • a 4-threads per inch series (4 UN) from 2 5/8 in to 6 in nominal diameter
  • a 6-threads per inch series (6 UN) from 1 7/16 in to 6 in nominal diameter
  • an 8-threads per inch series (8 UN) from 1 1/16 in to 6 in nominal diameter
  • a 12-threads per inch series (12 UN) from 5/8 in to 6 in nominal diameter
  • a 16-threads per inch series (16 UN) from 7/16 in to 6 in nominal diameter
  • a 20-threads per inch series (20 UN) from 5/16 in to 3 in nominal diameter
  • a 28-threads per inch series (28 UN) from 5/16 in to 1 1/2 in nominal diameter
  • a 32-threads per inch series (32 UN) from 7/16 in to 1 in nominal diameter

c) a special thread series (UNS) with diameter/pitch combinations other than those specified for the standard series.

BS 1580-1  is intended for use with BS 919-1 and BS 919-4 which specify the corresponding screw gauges.

BS 1580-1 contains:

Section 1: General 
Scope
Normative references
Terms and definitions and symbols
Profile of unified screw threads

Section 2: Standard series 
Diameter/pitch combinations 9
Tolerance classes of external and internal threads
Limits of size, and tolerances, for uncoated threads
Allowances for uncoated threads
Coated threads
Gauges
Designation of unified screw threads

Section 3: Special series (UNS)
Diameter/pitch combinations, fractional sizes
Diameter/pitch combinations, decimal sizes
Tolerance classes of external and internal UNS threads
Tolerances and allowances
Coated UNS threads
Designation of UNS threads

BS 1580-1:2007 supersedes BS 1580: Parts 1 & 2:1962, which is withdrawn.

 




Standard NumberBS 1580-1:2007
TitleUnified screw threads. Screw threads with diameters ¼ in and larger. Requirements
StatusConfirmed, Current
Publication Date31 December 2007
Confirm Date03 September 2019
Normative References(Required to achieve compliance to this standard)BS 919-4, BS 919-1:2007, BS 6528:1984
Informative References(Provided for Information)BS 3382:Parts 1 & 2, BS 3382-7, ASME B1.1-2003, BS 84, BS 2693-2, BS 3580, BS 2693-1, BS ISO 68-2:1998
ReplacesBS 1580-s 1 and 2:1962
Amended ByCorrigendum, August 2009
DescriptorsDimensions, Aircraft components, Bolts, Dimensional tolerances, Diameter, Threads, Nuts, Thread pitch, Designations, Metal coatings, Thread forms, Fits, Unified screw threads
ICS21.040.20
CommitteeFME/9
ISBN978 0 580 68654 2
PublisherBSI
FormatA4
DeliveryYes
Pages118
File Size1.055 MB
Price£298.00


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