Numbering System
FIRST TWO/FOUR CHARACTER DENOTES STYLE/FUNCTION OF HINGE:
2B
2 knuckle ball bearing
2H
2 knuckle ball bearing
heavy weight
heavy weight
2P
2 knuckle plain bearing
4B
4 ball bearing
heavy weight
heavy weight
4C
Concealed bearing
heavy weight
heavy weight
4F
5 knuckle concealed
heavy weight
heavy weight
PB
Plain bearing
BB
Ball bearing
CP
Concealed plain bearing
CB
Concealed bearing
CH
Continuous
heavy weight
heavy weight
FB
5 knuckle concealed bearing
IT
3/16″ Slip-In Insert
IF
5/16″ Slip-In Insert
PF
Concealed bearing
heavy weight
piston hinge
heavy weight
piston hinge
RB
Raised barrel
RS
Residual spring hinge
RP
Residual plain bearing
SP
Spring hinge
SC4B
Swing clear
heavy weight
heavy weight
SCPB
Swing clear
plain bearing
plain bearing
SCBB
Swing clear
ball bearing
ball bearing
WT4B
Wide throw
heavy weight
heavy weight
WTPB
Wide throw
plain bearing
plain bearing
WTBB
Wide throw
ball bearing
ball bearing
WB
Welding butt
THIRD/FIFTH CHARACTER DENOTES BASE MATERIAL USE
8
Wrought Steel
5
Stainless steel
3
Aluminum
2
Wrought brass
FOURTH/SIXTH CHARACTER DENOTES TYPE OF HINGE:
1
Full Mortise
2
Balf Mortise
3
Full Surface
4
Half Surface
Examples:
PB81
PB = Plain Bearing
8 = Steel
1 = Full Mortise
4b24
4B = Four Bearing Heavy Weight
2 = Brass
4 = Half Surface
SP51
SP = Spring Hinge
5 = Stainless Steel
1 = Full Mortise
SC4B83
SC4B = Swing Clear Heavy Weight
8 = Steel
3 = Full Surface