A = Ampere
AB = As Built
AC = Across Corners
AC = Air Conditioning
AC = Alternating Current
AF = Across Flats
AFF = Above Finished Floor
AFL = Above Floor Level
AG = Agricultural Pipe Drain
AGL = Above Ground Level
AHU = Air Handler Unit
AISI = American Iron And Steel Institute
AL = Aluminium
ALY = Alloy
AMER = American
AMS = Aerospace Material Standards
ANN = Anneal
ANSI = American National Standards Institute
APPROX = Approximately
APS = Approved Product Supplier
APSL = Approved Product Supplier List
AQL = Acceptable Quality Level
AR = As Required
AS = Aerospace Standards
ASA = American Standards Association
ASCII = American Standard Code for Information Interchange
ASME = American Society Of Mechanical Engineers
ASSY = Assembly
ASTM = American Society For Testing And Materials
AV = Approved Vendor
AVG = Average
AVL = Approved-Vendor List
AWG = American Wire Gauge
BASIC = Basic Dimension
BC = Bolt Circle
BCD = Bolt Circle Diameter
BHCS = Button Head Cap Screw
BHN = Brinell Hardness Number
BOM = Bill Of Materials
BOP = Bought Out Part
BP = Blueprint
BRZ = Bronze
BSC = Basic Dimension
BSP = British Standard Pipe
BT = Bath Tub or Boundary Trap
BTM = Bottom
C-C = Center-To-Center
C/T = Correlation / Tracking
CAD = Computer Aided Design
CAGE = Commercial And Government Entity
CBN = Cubic Boron Nitride
CBORE = Counterbore
CCTV = Closed Circuit TeleVision
CDA = Current Design Activity
CERT = Certification
CFW = Continuous Fillet Weld
CG = Centerless Grinding
CG = Centerless Ground
CHAM = Chamfer
CHS = Circular Hollow Section
CI = Cast Iron
CL = Center Line
CLG = Control Joint
CLR = Clearance
CM = Center Mark
CMU = Cement Masonry Unit
CNC = Computer Numerical Control
CNJ = Construction Joint
COL = Column
COMMS = Communications
CONN = Connection
CONT = Continuous
CR = Controlled Radius
CRES = Corrosion-Resistant steel
CRS = Cold Rolled Steel
CSINK = Countersink
CT = Controller
CTN = Carton
CTR = Center
CTRL = Control
CTRS = Centers
D = Delta
DIA = Diameter
DIM = Dimension
DIP = Ductile Iron Pipe
DN = Diameter Nominal
DO = Ditto
DP = Down Pipe
DPD = Digital Product Definition
DWG = Drawing
ECN = Engineering Change Note
ECO = Engineering Order
ECR = Engineering Change Request
ED = Edge Distance
ELEC = Electrical
EO = Engineering Order
EQ = Equal
EQL = Equal
EQUIP = Equipment
ERC = Electrical Rule Check
EW = Each Way
EWB = Electric Water Boiler
EXIST = Existing
F = Finish
FAO = Finish All Over
FCF = Feature Control Frame
FD = Field Of The Drawing
FIM = Full Indicator Movement
FL = Floor Level
FN = Flag Note
FOC = Fibre Optic Cable
FoS = Feature Of Size
FS = Far Side
FSBL = Full Strength Butt Weld
FSCM = Federal Supply Code For Manufacturers
FTG = Fitting
FTG = Footing
FTP = Fiber Termination Panel
FW = Fillet Weld
GCI = Gray Cast Iron
GD&T = Geometric Dimensioning And Tolerancing
GIS = Graphic Information System
GN = General Note
H&T = Hardened And Tempered
HBW = Hardness, Brinell, Tungsten Tip
HDPE = High Density Polyethelene
HHCS = Hex Head Cap Screw
HORIZ = Horizontal
HP = High Pressure
HRA = Hardness, Rockwell, A Scale
HRB = Hardness, Rockwell, B Scale
HRC = Hardness, Rockwell, C Scale
HRS = Hot Rolled Steel
HT = Heat Treat
IAW = In Accordance With
ID = Identification Number
ID = Inner Diameter
IED = Insufficient Edge Distance
IO = Inspection Opening
ISO = International Organization For Standardization
KEY = Key
kHz = Kilohertz
KJ = Key Joint
KPSI = Kilopounds Per Square Inch
KWh = Kilo Watt Hour
L = Steel Angle
LAN = Local Area Network
LDD = Limited Dimension Drawing
LGX = Line Group Cross
LH = Left Hand
LM = List Of Materials
LMC = Least Material Condition
LPG = Liquid Petroleum Gas
M.J. = Movement Joint
M = Meter
MACH = Machine
MAJ = Major
MAX = Maximum
MBD = Model-Based Definition
MBP = Measurement Between Pins
MBW = Measurement Between Wires
MDF = Main Distribution Frame
MF = Make From
MFD = Manufactured
MFG = Manufacturing
MFR = Manufacturer
MHz = Megahertz
MIN = Minimum
MISC = Miscellaneous
MM = Millimetres
MMC = Maximum Material Condition
MOP = Measurement Over Pins
MOW = Measurement Over Wires
MPA = Megapascals
MRB = Material Review Board
MRP = Material Requirements Planning
MS- = Military Standard
MS = Mild Steel
N&T = Normalized And Tempered
NAS = National Aerospace Standards
NC = Numerical Control
NCM = Nonconforming Materials
NCR = Nonconformance Report
NEC = National Electrical Code
NEC = Not Elsewhere Classified
NEF = National Extra Fine
NET = Network
NF = National Fine
NL = Notes List
NO = Number
NOM = Nominal
NORM = Normalized
NPR = New Product Release
NPS = Naval Primary Standard
NPT = National Pipe Taper
NS = National Special; Near Side
NS = Near Side
NSCM = National Supply Code For Manufacturers
NSOP = Not Shown On Plan
NTS = Not To Scale
OAL = Overall Length
OC = On Center
OD = Outer Diameter
OD = Outside Diameter
ODA = Original Design Activity
OHL = Over High Limit
OPP = Opposite
OPT = Optional
ORIG = Original
P.F. = Press Fit
pc = Piece
PCD = Pitch Circle Diameter
pcs = Pieces
PD = Pitch Diameter
PDM = Product Data Management
PDMS = Product Data Management System
PFC = Parallel Flange Channel
PH = Pilot Hole
PH = Precipitation-Hardened
PHR BRZ = Phosphor Bronze
PL = Parts List
PL = Plate
PLM = Product Lifecycle Management
PMI = Product And Manufacturing Information
PN = Part Number
POI = Point Of Intersection
PSI = Pounds Per Square Inch
PT = Pressure Tapping
PTFE = Polytetrafluoroethylene
PVC = Polyvinyl Chloride
QC = Quality Control
QMS = Quality Management System
QTY = Quantity
R = Radius
RA = Rockwell A Scale
RA = Roughness Average
RAD = Radius
RAS = Reliability, Availability and Serviceability
RB = Rockwell B Scale
RC = Rockwell C Scale
REF = Reference
REF = Reference
REINF = Reinforcement
REQD = Required
REV = Revision
RFQ = Request for Quote
RFS = Regardless Of Feature Size
RH = Right Hand
RHR = Roughness Height Reading
RHS = Rectangular Hollow Section
RL = Reduced Level or Relative Level
RMA = Return Material Authorization
RMS = Root Mean Square
RT = Room Temperature
RT = Rough Turned
RTP = Release To Production
RTV = Return To Vendor
RTV = Room-Temperature Vulcanizing
RZ = Roughness
SAE = Society Of Automotive Engineers
SAN = Sanitary
SC = Sharp Corners
SDU = Sanitary Disposal Unit
SF = Spotface Slip Fit
SF = Strip Footing
SFACE = Spotface
SHCS = Socket Head Cap Screw
SHN = Shown
SHS = Square Hollow Section
SHSS = Socket Head Set Screw
SI = System International
SIM = Similar
SL = Structural Level
SN = Serial Number
SOL ANN = Solution Annealed
SPEC = Specification
SPHER ANN = Spheroidize Anneal
SPOTFACE = Spot Facing
SQ = Square
SR = Spherical Radius
SS = Stainless Steel
SSL = Structural Slab Level
SST = Stainless Steel
STA = Solution Treated And Aged
STD = Standard
STEP = Standard For The Exchange Of Product Model Data
STI = Screw Thread Insert
STK = Stock
STL = Steel
TAP = Tapped Hole
TB = Tie Beam
TB = Title Block
TDP = Technical Data Package
TEMP = Temperature
TFC = Taper Flange Channel
THD = Thread
THK = Thick
THK = Thickness
THRD = Threaded
THRU ALL = Through All
THRU = Through
TIR = Total Indicated Run-Out
TIR = Total Indicator Reading
TOL = Tolerance
TOS = Top Of Steel
TSC = Theoretical Sharp Corners
TUN = Tundish
TY = Type
TYP = Typical
UA = Unequal Angle
UAI = Use As-Is
UB = Universal Beam
UC = Universal Column
ULL = Under Low Limit
UNC = Unified National Coarse
UNEF = Unified National Extra Fine
UNF = Unified National Fine
UNJC = Unified National "J" Series Coarse
UNJF = Unified National "J" Series Fine
UNO = Unless Noted Otherwise
UNS = Unified National Special
UNS = Unified Numbering System
UON = Unless Otherwise Noted
UOS = Unless Otherwise Specified
USASI = United States Of America Standards Institute
USS = United States Standard
USS = United States Steel
UTS = Ultimate Tensile Strength
UTS = Unified Thread Standard
VA = Value Analysis
VERT = Vertical
W/I = Within
W/O = Without
WAN = Wide Area Network
WB = Welded Beam
WC = Tungsten Carbide
WC = Water Closet
WC = Welded Column
WD = Working Drawing
WI = Wrought Iron
WP = Water Proof
YS = Yield Strength