referring to the drawings , a hinge embodying the present invention is shown having a pair of juxtaposed hinge leaves 1 and 2 . along the respective adjacent edges of the leaves lie hinge knuckles 3 and 4 . each hinge knuckle is formed by a cylindrical metal sleeve attached to the edge of its leaf with a bore axis parallel to the leaf edge and co - linear to that of the other knuckles . a number of bearings 5 are provided , each having a bore of equal diameter to , and a bore axis co - linear with , hinge knuckles 3 and 4 . a metal hinge pin 8 extends through the cylindrical bore of the hinge knuckles and bearings . the face of each leaf 1 and 2 is provided with a series of countersunk mounting holes , 9 and 10 respectively , adapted to receive screws . one leaf 2 of the hinge is provided with a security stud 11 described further below . the other leaf 1 has an aperture 14 suitable for receiving the stud 11 when the leaves are in the overlying ( closed ) position . as shown in fig2 the security stud 11 , tapered to facilitate its entry into the aperture 14 , has a centrally drilled bore 15 to receive a roller 16 resistant to cutting . thus a saw engaging the roller will cause its rotation and will not be able to bite into and saw through the roller . for additional protection , the roller can be formed of a hard steel , can be formed of a metal hardened after fabricating , or can have a case hardened surface . the term &# 34 ; hard surface &# 34 ; when used with the stud or stud roller herein denotes a stud or stud roller formed according to any one of the foregoing descriptions , or by any similar material or method . the bore 17 , partially closed after insertion of the roller by staking the stud to the leaf 2 , retains the roller in position . referring to fig5 several engaging hard surface roller balls 21 resistant to cutting for the reasons the roller 16 is so resistant , can be used in place of the roller 16 . another tapered security stud 12 , shown in fig3 has a centrally drilled bore 29 and is formed of a conventional hard surface metal resistant to sawing , for example a hardened steel . this stud is attached to the leaf by means of a rivet 30 pressed into the bore 29 . a cylindrical stud 13 , shown in fig4 has a centrally drilled bore 18 in which is inserted a hard surface roller 19 that resists cutting . a metal ball 20 , pressed in place at the entrance , retains the roller in position . this stud requires a slightly larger aperture than the tapered stud . fig6 illustrates another cylindrical security stud 22 including a pin 23 and formed with a flange 24 which retains in proper position a rotatable cylindrical roller sleeve 25 , hence it is resistant to cutting . the sleeve 25 can also be formed of a hard surface metal to make cutting more difficult . another security stud 26 , shown in fig7 is attached to the leaf 2 by forming a head 27 after its insertion into a slightly oversized mounting aperture 28 formed in the leaf 2 . the entire stud is thereby free to rotate with respect to the leaf . the stud 26 may also be formed of a hard surface metal as a further safeguard . in operation , one hinge leaf with one of the studs 11 , 12 , 13 , 22 or 26 , resistant to cutting , is attached to the door , while the other hinge leaf is attached to the jamb . during normal opening and closing of the door , the hinge pivots and the security stud enters and leaves the aperture 14 . however , should the hinge pin 8 be removed or the knuckles sawed off while the hinge ( and thereby the door ) is in the closed position , the stud interferes with any parallel movement of the hinge leaves 1 and 2 , thereby preventing removal of the door , as best illustrated in fig3 . the stud is also long enough so that any relative perpendicular movement , i . e ., displacement of one leaf from the other , possible between the leaves with the hinge pin removed or knuckles sawed off due to clearance between the door and jamb is not sufficient to withdraw the stud 11 from the aperture 14 . this can be achieved by having the pin extend beyond the hinge at least about the thickness of one leaf . in addition , if an attempt is made to remove the door by inserting a hacksaw or similar cutting instrument into the space between the leaves ( fig3 ) and sawing through the stud , it would fail . with the roller insert studs of fig2 and 4 , or the ball insert stud of fig5 after the stud 11 is partially sawed through , the hacksaw blade encounters the internal roller 16 or 19 , or the internal balls 21 . such roller or ball rotates with the passing of the hacksaw blade , and thus prevents further cutting . with the embodiment of the stud described in connection with fig3 the stud 12 , being formed of a metal resistant to cutting , resists the hacksaw blade and prevents sawing therethrough . with the sleeve - stud arrangement described in connection with fig 6 or the stud of fig7 an attempt to saw through the stud 22 or 26 would likewise fail . upon engagement by the blade of a hacksaw , the external sleeve 25 or the stud 26 will rotate with the passing of the blade , and thus prevent cutting . the form of invention described herein is illustrative and may be embodied in other forms while still employing the inventive principles contained herein . thus , the invention has been described as applicable to a door and corresponding door jamb . the invention is equally applicable to hinges for windows , boxes , and other closures . all such modifications and variations are intended to be within the scope of the invention as defined in the following claims .