BS A 241:1973

Foreword
Specification
1.1 Scope
1.2 Material
1.3 Manufacture
1.4 Dimensions
1.5 Run-out of screw threads
1.6 Surface treatment
1.7 Identification marking
1.8 Packaging
2 Inspection procedure
2.1 General
2.2 Acceptance of production batches
2.3 Control of dimensions
2.4 Surface texture
2.5 Geometric tolerances
2.6 Freedom from material defects
2.7 Tests to determine the mechanical properties
Appendices
A Sampling and acceptance requirements for tensile,
     shear, tension-tension fatigue tests
B Tension-tension fatigue testing requirements
C Test jigs
D Samplings and acceptance requirements
E Head to shank fillet rolling - permissible
     distortion
F Thread run-out and incomplete thread
G Bolt strength levels
Tables
1 AQL for use with inspection level II
2 Surface texture
3A Straightness tolerance: inch bolts
3B Straightness tolerance: metric bolts
4 Hardness
5 Variables plan for tension and shear, and
     attributes plan for tension-tension fatigue tests
6 Fatigue loading for inch bolts (180 000 - 200 000
     lbf/in2 tensile strength)
7 Fatigue loading for metric bolts (1 250 - 1 380 MPa
     tensile strength)
8 Fatigue loading for inch bolts (260 000 - 280 000
     lbf/in2 tensile strength)
9 Fatigue loading for metric bolts (1 800 - 1 930 MPa
     tensile strength)
10 Shear strength test rig dimensions: inch bolts
11 Shear strength test rig dimensions: metric bolts
12 Permissible discontinuities: inch bolts
13 Permissible discontinuities: metric bolts
14 Sampling
15 Dimensions of permissible distortion: inch bolts
16 Dimensions of permissible distortion: metric bolts
17 Dimensions for radius A: inch bolts
18 Dimensions for radius A: metric bolts
19 Shear and tensile strength of inch bolts (180 000 -
     200 000 lbf/in2 tensile strength)
20 Shear and tensile strength of metric bolts (1 250 -
     1 380 MPa tensile strength)
21 Shear and tensile strength of inch bolts (260 000 -
     280 000 lbf/in2 tensile strength)
22 Shear and tensile strength of metric bolts (1 800 -
     1 930 MPa tensile strength)
23 Torque values for stress durability test for inch
     bolts (180 000 - 200 000 lbf/in2 tensile strength)
24 Torque values for stress durability test for metric
     bolts (1 250 - 1 380 MPa tensile strength)
25 Torque values for stress durability test for inch
     bolts (260 000 - 280 000 lbf/in2 tensile strength)
26 Torque values for stress durability test for metric
     bolts (1 800 - 1 930 MPa tensile strength)
Figures
1 Geometrical tolerances
2 Typical static-tension and tension-tension fatigue
     test rig
3 Typical compression type shear strength test rig
4 Detail of metallurgical specimen
5 Grain flow in threads
6 Typical laps and surface irregularities in threads
7 Satisfactory grain flow, after machining
8 Minimum acceptable standard of grain flow, after
     machining
9 Unacceptable grain flow, after machining
10 Permissible distortion of head to shank fillet
11 Thread to shank run-out, tapered
12 Thread to shank run-out, shouldered
13 Thread to shank run-out, relieved
14 Thread to head run-out, tapered
15 Thread to head run-out, relieved

Gives general requirements for metric and inch steel protruding head aerospace bolts of tensile strength of 1250 MPa (180 000 lbf/ square inch) or greater. Tabulates requirements related to nominal size in individual tables for use as appropriate to the relevant bolt specification. Includes identification marking and packaging, sampling and acceptance requirements for tensile, shear, tension-tension fatigue tests, tension-tension fatigue testing requirements, test jigs, samplings and acceptance requirements for metallurgical characteristics and stress durability, head to shank fillet rolling - permissible distortion, thread run-out and incomplete thread and bolt strength levels.