| BS1981 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1981-NO.4-40UNCX1/2LG | U9115 | MINISTRY OF DEFENCE BRITISH STANDARD REFERENCES CONSTRUCTED TO A DEFINITI LEVEL FOR EUROFIGHTER AND TORNADO U NCB TASKING |
| BS1981-TABLE 12 4 UNC X 1/2 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1981PANHD4-40UNC1-21NCD | U9115 | MINISTRY OF DEFENCE BRITISH STANDARD REFERENCES CONSTRUCTED TO A DEFINITI LEVEL FOR EUROFIGHTER AND TORNADO U NCB TASKING |