| BS1981 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1981-4-40UNCSPANHDX0-251NSS | 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 1/4 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1981TBL12SLTNO4UNCX1/4INSTST | U9115 | MINISTRY OF DEFENCE BRITISH STANDARD REFERENCES CONSTRUCTED TO A DEFINITI LEVEL FOR EUROFIGHTER AND TORNADO U NCB TASKING |