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BS 1580-3:2007 Unified screw threads - Screw threads with diameters below ¼ in. Requirements, 2007
- Contents [Go to Page]
- 1 Scope 1
- 2 Normative references 1
- 3 Terms and definitions and symbols 1
- 4 Thread profiles 1
- 5 Diameter/pitch combinations 2
- 6 Tolerance classes 2
- 7 Tolerances, allowances and limits of size for uncoated threads 2
- 8 Coated threads 3
- 9 Designation of threads 4
- 10 Gauges 4
- Annexes
- Annex A (normative) Unified screw threads below in diameter for attachment purposes and for general use in the aircraft industry 16
- Bibliography 17
- List of tables
- Table 1 - Unified screw threads below in diameter, standard series 5
- Table 2 - Unified screw threads below in diameter, standard series - Limits of size 6
- Table 3 - Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 2A 8
- Table 4 - Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 2B 8
- Table 5 - Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 3A 9
- Table 6 - Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 3B 9
- Table 7 - Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 2A 10
- Table 8 - Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 2B 10
- Table 9 - Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 3A 11
- Table 10 - Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 3B 11
- Table 11 - Extra fine thread series (UNEF) below in diameter - Limits and tolerances for finished uncoated threads - External threads Classes 2A and 3A 12
- Table 12 - Extra fine thread series (UNEF) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Classes 2B and 3B 12
- Table 13 - Coarse thread series (UNC) sizes below in diameter - Basic dimensions 13
- Table 14 - Fine thread series (UNF) sizes below in diameter - Basic dimensions 13
- Table 15 - Extra fine thread series (UNEF) sizes below in diameter - Basic dimensions 14
- Table 16 - Thread data for unified thread form 24 t.p.i. to 80 t.p.i. 15
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions and symbols [Go to Page]
- 3.1 Terms and definitions
- 3.2 Symbols
- 4 Thread profiles
- 5 Diameter/pitch combinations
- 6 Tolerance classes [Go to Page]
- a) external threads:
- b) internal threads:
- 7 Tolerances, allowances and limits of size for uncoated threads
- 8 Coated threads [Go to Page]
- 8.1 General
- 8.2 Class 2A external threads
- 8.3 Class 2AG external threads
- 8.4 Class 3A external threads
- 8.5 Class 2B internal threads
- 8.6 Class 3B internal threads
- 9 Designation of threads [Go to Page]
- 9.1 Basic designation [Go to Page]
- a) the thread number;
- b) the number of threads per inch;
- c) the thread series, UNC, UNF or UNEF;
- d) the thread class, 2A, 2AG, 3A, 2B or 3B.
- 9.2 Additional designations
- 10 Gauges [Go to Page]
- Table 1 Unified screw threads below in diameter, standard series (Extension of Table 1 of BS 1580-1)
- Table 2 Unified screw threads below in diameter, standard series - Limits of size (Extension of Table 2 of BS 1580-1)
- Table 3 Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 2A (Extension of Table 5 of BS 1580-1)
- Table 4 Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 2B (Extension of Table 6 of BS 1580-1)
- Table 5 Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 3A (Extension of Table 7 of BS 1580-1)
- Table 6 Coarse thread series (UNC) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 3B (Extension of Table 8 of BS 1580-1)
- Table 7 Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 2A (Extension of Table 11 of BS 1580-1)
- Table 8 Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 2B (Extension of Table 12 of BS 1580-1)
- Table 9 Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - External threads Class 3A (Extension of Table 13 of BS 1580-1)
- Table 10 Fine thread series (UNF) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Class 3B (Extension of Table 14 of BS 1580-1)
- Table 11 Extra fine thread series (UNEF) below in diameter - Limits and tolerances for finished uncoated threads - External threads Classes 2A and 3A
- Table 12 Extra fine thread series (UNEF) below in diameter - Limits and tolerances for finished uncoated threads - Internal threads Classes 2B and 3B
- Table 13 Coarse thread series (UNC) sizes below in diameter - Basic dimensions (Extension of Table 15 of BS 1580-1)
- Table 14 Fine thread series (UNF) sizes below in diameter - Basic dimensions (Extension of Table 16 of BS 1580-1)
- Table 15 Extra fine thread series (UNEF) sizes below in diameter - Basic dimensions (Extension of Table 17 of BS 1580-1)
- Table 16 Thread data for unified thread form 24 t.p.i. to 80 t.p.i. (Extension of Table 26 of BS 1580-1 with identical values in the overlapping range of 40 t.p.i. to 24 t.p.i.)
- Annex A (normative) Unified screw threads below in diameter for attachment purposes and for general use in the aircraft industry [Go to Page]
- A.1 Tolerance class
- A.2 Allowance for uncoated threads
- A.3 Limits of size
- A.4 Coated threads
- A.5 Designation of threads
- A.6 Gauges
- Bibliography [Go to Page]
