| BS1981 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1981-TABLE 12 2 UNC X 5/16 | K7766 | BRITISH STANDARDS INSTITUTION |
| XS4293 | K0668 | LEONARDO UK LTD |
| BS1981TABLE12 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1981TABLE12-2-56UNC5-16 | U9115 | MINISTRY OF DEFENCE BRITISH STANDARD REFERENCES CONSTRUCTED TO A DEFINITI LEVEL FOR EUROFIGHTER AND TORNADO U NCB TASKING |
| BS1981TABLE12-2-56UNX5-16 | U9115 | MINISTRY OF DEFENCE BRITISH STANDARD REFERENCES CONSTRUCTED TO A DEFINITI LEVEL FOR EUROFIGHTER AND TORNADO U NCB TASKING |