| Abbreviation |
Definition |
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| A |
Ampheres or Amps |
| Ack |
Acknowledge |
| AE |
Authorized Entry |
| AH |
Allen Head (screws); usually followed by |
| A.H.C. |
Architectural Hardware Consultant |
| AL . |
Aluminum; also Alum |
| AMS |
All machine screws |
| AN |
Anodized |
| ASA |
American Standards Association |
| AU |
Auxiliary |
| AWG |
American wire gauge |
| AWS |
All wood screws |
Top
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| BB |
Ball bearing |
| Bev |
Beveled (as in lock front, door edge or stile) |
| B.H.M.A. |
Builders Hardware Manufacturers Association |
| BPS |
Bolt position switch |
| BS |
Backset (of a lock) |
| BTB |
Back to back; also B to B |
Top
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| C |
Center of centerline |
| C |
Common |
| CCTV |
Closed circuit television |
| CF |
Customer furnished |
| CFC |
Cut for cylinder; also used - C for cylinder; C/C and cut/cyl |
| CFT |
Cut for turn knob; also used - C/th, CFTT, c for t.k. |
| CH |
Channel |
| CI |
Channel iron (door frame) |
| CLS |
Closed loop secure |
| Corr |
Corridor |
| CS |
Concealed switch (hinge) |
| CTC |
Countersunk |
| Cyl |
Cylinder (of a lock) |
Top
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| DA |
Double acting |
| DB |
Decibel |
| Dbl. |
Double; also used Dble |
| Deg |
Degree |
| Dia |
Diameter |
| DP |
Dust proof |
| DP |
Display panel |
| DPS |
Door position switch |
| DPS |
Dust proof strike |
| DPDT |
Double pole double throw |
| Dr |
Door |
| DT |
Dummy trim |
Top
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| Ea |
Each |
| Eq |
Encl Equipment Enclosure |
| EOL |
End-of-line resistor |
| ES |
Expansion shield |
| Ext |
Exterior |
Top
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| FBT |
Flat button tip (hinge) |
| FD |
Fire door |
| FH |
Flat head (screw) |
| Fl |
Floor |
| Fr |
(of a door or sash); commonly used with |
| FS |
Fail-safe operation |
Top
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| Ga |
Gauge |
| Gal |
Gallon |
| GN |
Grommet nut |
| GND |
Ground |
Top
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| HC |
Hollow core |
| Hdg |
Heading |
| HM |
Hollow metal |
| Hr. |
Hour (¾hr.,1½hr.,3hr-fire door ratings) |
| HT |
Hospital tip (hinge or pivot) |
| Hz. |
Hertz |
Top
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| ID |
Inside diameter |
| Int. |
Interior |
| Int. |
Intermittent duty |
Top
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| J |
Jamb |
| J |
Jack |
Top
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| Kal. |
Kalamein; also K |
| Ka |
Keyed alike |
| KD |
Keyed different |
| KVA |
Thousand volt amp |
Top
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| L Lip |
(of a strike) |
| LBR |
Less bottom rod (of a vertical rod type exit device) |
| L/C |
Less cylinder |
| L.E.D. |
Light emitting diode |
| LH |
Left hand |
| LHRB |
Left hand reverse bevel |
| LL |
Lead lining (of a door) |
| Lox. |
Locks |
| LP |
Light-proof (door) |
| LS |
Lead shield |
| LT |
Lamp test |
Top
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| M |
Meter |
| M.A. |
Milliamps |
| Maint. |
Maintained |
| MC |
Metal clad |
| M x M |
Metal by metal; denotes metal door in metal frame |
| Max. |
Maximum |
| Min. |
Minimum |
| Mom. |
Momentary |
| MS |
Machine screws |
Top
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| NS |
Narrow stile |
Top
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| OB |
Oilite bearings (as in hinge) |
| OBS |
Open back strike |
| OD |
Outside diameter |
| OH |
Oval head (screw) |
| O.H. |
Overhead (door) |
| O.L.S. |
Open loop secure |
| OS |
Outside |
| OSKP |
Outside knob pinned |
| OST |
Outside trim; also OS/T |
Top
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| P |
Plug |
| PBS |
Protected box strike; also used PBX |
| P.C. |
Printed circuit |
| PH |
Phillips head (screw) |
| P.L. |
Power lock |
| P.O.A. |
Price on application |
| Pr. |
Pair |
| P.S. |
Power supply |
| PSI |
Pounds per square inch |
| P.U.L. |
Power unlock |
Top
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| Rab. |
Rabbeted |
| Rad. |
Radius |
| RB |
Reverse bevel |
| RC |
Rounded corners |
| RF |
Radius front; denotes lock or flush bolt with |
| Reg. |
Regular |
| Rem. Mul. |
Removable Mullion (for use with exit device) |
| RH |
Round head (screw) |
| RH |
Right hand |
| RHRB |
Right hand reverse bevel |
| Rm. |
Room |
| RA |
Remote alarm |
| RR |
Remote alarm |
| RR |
Remote reset |
| Rtn. |
Return |
Top
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| Sgl. |
Single |
| SH |
Security safety stud |
| SH |
Spanner head (screw) |
| SMS |
Sheet metal screws |
| SNB |
Sex nuts and bolt; also SBN |
| Spdle. |
Spindle (for a knob) |
| S.P.D.T. |
Single pole double throw |
| SS |
Stainless steel |
| Std. |
Standard |
| STMS |
Strike to template machine screw |
| STS |
Self-tapping screw |
Top
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| TB |
Terminal block |
| TB |
Through bolts |
| TBGN |
Through bolts and grommet nuts |
| TBN |
Through bolts and nuts |
| TC |
Tin clad |
| TD |
Time delay |
| TMS or tms |
To Template with machine screws |
Top
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| UC |
Undercut (door) |
| UC |
Undercut head (screws); also used US and UCH |
| UL |
Underwriters Laboratories |
| US |
United States; commonly used as prefix to |
Top
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| VA |
Volt amps |
| VAC |
Volts alternating current |
| VDC |
Volts direct current |
| VOM |
Volt-ohm meter |
Top
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| Wd |
Wood |
| WD x MF |
Wood door x metal frame |
| WD x WF |
Wood door x wood frame |
| WS |
Wood screws |
Top
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| x |
By (i.e. HMD x HMF) |
| X-bar |
Cross bar (of an exit device) |
Top
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| Yds. |
Yards |
| Top |
