1453 in J. Stuart & G. Burnett Exchequer Rolls Scotl. (1882) V. 556 xxxiiij grotis of xijd. grotis and jd., in a lokfast box.

1554 in J. Stuart Extracts Council Reg. Aberdeen (1844) I. 281 The saidis baillies suld tak and apprehend the said John Chalmer, and put him in custodie in stark lokfast hows.

1641 Act 17 Chas. I c. 52 The other Inventar shall be laid up, either with their Honours, or some other lockfast place.

1687 Contract in Misc. Sc. Hist. Soc. (1990) 11 309 The said Tobias Bachop..obleidges him..to make steicked and lockfast doors conforme to the said draught.

1752 J. Louthian Form of Process (ed. 2) 137 That ye make steiked and lockfast Gates and Doors open and patent.

a1768 J. Erskine Inst. Law Scotl. (1773) II. iii. vi. §25 517 If the debtor's goods be within lockfast doors..he ought to return an execution setting forth that fact.

1820 W. Scott Monastery II. x. 304 Having no sure lockfast place of my own.

1838 Blackwood's Mag. 43 440 Psychology will be..lightened of a useless and unmarketable cargo which has kept her lockfast for many generations.

1888 A. S. Swan Doris Cheyne xv. 232 It was not lockfast, of course, but I had no right with what it contained.

1931 J. Geddie Old Morayshire Characters 125 For holding these Jock had a strong lockfast box.

2010 Dunoon Observer & Argyllshire Standard 7 May 2/1 Police would like to remind householders to ensure that their homes are secure and lockfast.

1851 Glasgow Herald 7 Mar. 6/3 A massive key..so tremendously rusted that it would no longer guard the lockfasts of modern times.

1862 J. Binny in H. Mayhew London Labour (new ed.) Extra vol. 341/1 A third party, entered the house,..broke open several lockfasts, and stole the whole of the plate.

1911 W. B. Grubb & H. T. M. Jones Unknown People in Unknown Land xxi. 210 Our houses are of such a nature that they could easily be entered, and even our lock-fasts would offer a poor resistance to any native desirous of breaking into them.

1862 Glasgow Herald 3 Nov. 2/2 (advt.) Gentlemen adopting Breech-Loading Guns are invited to inspect the mechanism of Dougall's ‘Patent Lock-Fast Guns’.

1883 Hand Bk. Gun, Fishing-rod & Tackle Requisites Hardy Brothers 52 Fitted with our spiral lock-fast joints, 7s 6d each rod extra.

1890 Internat. Ann. Anthonys Photogr. Bull. 327 So long as there is ample bearing surface and a good lock fast attachment.

1920 Merchandising Week Jan. 50/2 It is called a ‘lockfast’ plug and locks instantly by inserting and making a slight turn to the right.

1938 L. V. Bates Tackle-making for Anglers i. 31 There is only one correct position for a lockfast ferrule, that is, with the locking-arm lying on the opposite side to the rings when the joint is screwed home.

1983 Buck & Hickman Catal. 1983–5 816/1 Drain rods and accessories... There is a choice of either universal or lockfast joints.

2006 J. Walter Rifles of World (ed. 3) 556/1 The Lock Fast system was particularly popular in the 1870s before being superseded by better designs.