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Common Fastener Related Abbreviations

publish:2023-07-10 09:34:45   views :167
publish:2023-07-10 09:34:45  
#3 (or #7)Refers to head design of a plow bolt
&NTWith nut
18-8Stainless Steel with 18% Chrome and 8% Nickel
2, 5 or 8Strength grade of a screw or nut
2A (3A)Class of thread fit for inch screws
2B (3B)Class of thread fit for inch nuts
2HNut strength level designation (ASTM A194 Grade 2H Heavy Hex Nut)
6GClass of thread fit for metric screws
6HClass of thread fit for metric nuts
A325Heavy hex structural bolt (ASTM A325), similar to Grade 5
A490Heavy hex structural bolt (ASTM A490), similar to Grade 8
A574Strength grade for socket head cap screws (ASTM A574)
AISIAmerican Iron and Steel Institute, specifies chemical composition of steels
ANPrecedes a dimensional specification for aircraft fasteners developed by the Aeronautical Standards Group.
ANSIAmerican National Standards Institute
ASAlloy steel
ASMEAmerican Society of Mechanical Engineers
ASTMUsed before a standard number developed by the American Society for Testing and Materials group.

When followed by a number (ex: B-90), indicates hardness measured on the Rockwell B Scale.

Also an abbreviation for Boron.

Bake (Bake-Out)Heat treat process used in plating to prevent Hydrogen embrittlement
BevelStyle of washer (square with a taper) used with I beams
BellevilleStyle of lock washer, also called conical spring washer
BHCSButton head cap screw
BHNHardness measured with a Brinell Hardness Tester
BSBritish Standard
BSFBritish Standard Fine
BSWBritish Standard Whitworth
BTBolt (on drawings)

When followed by a number (ex: C-35), indicates hardness measured on the Rockwell C Scale.

Also an abbreviation for Carbon.

C/RCross recess drive (typically Phillips style), Also Chamfer/Radius
CadCadmium plating
CADComputer Aided Design / Drafting
Cad/WaxCadmium plating with a topcoat of wax
CHCase hardened (type of heat treatment)
CLClass (Metric material/Strength specification)
COOCountry of Origin
CRESCorrosion resistant steel (usually refer to 18-8 or 316 stainless steel)
CS (cs)Carbon or Steel, Also Countersunk
CSSCounter sunk screw (flat or oval head)
CTCourse Thread
DAC (Dac 320)Dacromet coating (registered trademark of Coatings International)
D/C NutDouble chambered nut (distinguished from washer faced)
 D/EDouble ended stud 
 DINAn abbreviation for Deutsches für Normung, the German standards body.  In reference to fasteners, DIN indicates fasteners that conform to a specific metric standard (will be followed by the standard number). 
 DeltasealMagnigard coating (registered trademark of Magni Engineered Coatings) 
 DorrltechMagnigard coating (registered trademark of Magni Engineered Coatings)
DrisealPipe Thread (registered trademark of Parker Hannifin)
External thread 
FFully threaded
FBFlange Bolt
F436Hardened flat washer with dimensions per ASTM F436
FHFlat head
FHCSFlat head cap screw
FILFillister Head
FIMFull indicator measurement
FINFinishing (washer)
FlngHex flange bolt or nut
FNDRFender (washer)
 FTFine thread or Fully threaded 
FWFlat washer 
galv Galvanized, typically refers to Hot Dip Galvanized 
GrGrade, refers to strength level of screw or nut (ex: Grade 2, Grade 8)
HBHex bolt, Also hardness reading measured on the Brinell Scale
HCSHex cap screw, also high Carbon steel
H.D.G.Hot dip galvanized
HHCSHex head cap screw, Also heavy hex cap screw
HHMBHex head machine bolt
HRBHardness measured on the Rockwell B scale
HRCHardness measured on the Rockwell C scale
H.T.Heat treated
HWHHex washer head
IDIdentification (usually refers to manufacturer logo)
IFIIndustrial Fastener Institute
IHIndented head
 ISOInternational Standards Organization 
ISIRInitial Sample Inspection Report
ITInternal thread
J429SAE standard that specifies strength levels of screws
J995SAE standard that specifies strength levels of nuts
KShorthand for the number 1,000
KepsNut with a permanently attached washer
Kips1,000 points
ksiThousands of pounds per square inch
LB (lb)Lag bolt, Also weight in pounds
LbBody length on screws
LCSLow Carbon steel
LHLeft hand thread
LWLock washer
MBMachine bolt
MSMachine Screw
MSNTMachine Screw Nut
MTRMaterial Test Report
 NCUnified National Course Thread 
 NE (NU, NTE, NTU)Designations that define the thickness of nylon insert lock nuts
 NFUnified National Fine Thread 
 NomNominal (reference dimension) 
 NPTNational Tapered Pipe Thread 
 OHOval head 
OV Oval head 
Thread pitch, Also Phillips head
P/BPlow bolt
PHPhillips head
Phil. Or Ph DrPhillips drive
Phos (P & O)Phosphate and oil coating (typically Zinc Phosphate and Oil)
PlPlain finish
P/NPart number
PNPan head
Pozi DriveSpecial cross recess (registered trademark of Camcar Textron)
PPAPProduction part approval process
psiPounds per square inch
PTPartial thread
PZPozi-drive style of cross recess
Rb (RB or HRB)Hardness measured on the Rockwell B Scale
Rc (RC or HRC)Hardness measured on the Rockwell C Scale
RDRound head
RHRound head, or Right hand thread
RTRolled threads
S/S Stainless steel 

Standard American Equivalent - Uses inches as unit of measure, as opposed to metric.   

Also: SAE Pattern (washers). These washers have a smaller inside diameter than USS pattern washers.

Also: Society of Automotive Engineers

Also: When used with washers, it means "small OD."

Also: When used with screws or nuts, it means "fine thread."

SBRSilicon bronze
Square drive 
SEMSA type of pre-made screw and washer assembly 
SHCSSocket head cap screw
Slot.Slotted drive
SMSSheet metal screw
Sq.Square. Can also refer to square head bolt or square nut.
SSStainless steel or Set Screw
TaptiteSpecial triangular thread forming screw (registered trademark of Reminc)
T.H.Through hardened (type of heat treatment)
TIRTotal Indicator Reading
T/STapping screw
Torx6 lobe drive (Torx Drive, registered trademark of Camcar Textron)
TPIThreads per inch
TT (TR)Taptite thread (registered trademark of Reminc), also called Tri-Roundular
TTHThreaded to head
Type 1 (23, 25)Special thread forming or cutting tapping screws
Type AB (F, T)Special thread forming or cutting tapping screws
UNCUnified National Coarse Thread
UNFUnified National Fine Thread
UNRUnified National Thread with radius root
UNRCUnified National Coarse Thread with Radius Root (standard rolled thread form)
UNRFUnified National Fine Thread with Radius Root (standard rolled thread form)

USS Pattern (washers).  These washers have a larger outside diameter than SAE pattern washers. 

Also used to indicate US course thread.

UTSUltimate tensile strength
WACWidth across corners
WAFWidth across flats
W/FWasher faced (can refer to a nut or a cap screw)
WhitworthBritish Thread Standard (not the same as UN threads)
WSWood screw
YYellow chromate
YSYield Strength
ZnZinc, usually referencing zinc plating (assumed to be clear zinc with clear chromate)
Zn/C (ZC)Zinc plating with clear chromate topcoat
Zn PhosZinc phosphate and Oil (same as Phos and Oil)
Zn/WaxZinc plating with a topcoat of wax
Zn/Y (ZY)Zinc plating with yellow chromate topcoat
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