NUMBERING SYSTEM

FIRST TWO/FOUR CHARACTER DENOTES STYLE/FUNCTION OF HINGE:

2B

2 KNUCKLE BALL BEARING

2H

2 KNUCKLE BALL BEARING HEAVY WEIGHT

2P

2 KNUCKLE PLAIN BEARING

4B

4 BALL BEARING HEAVY WEIGHT

4C

CONCEALED BEARING HEAVY WEIGHT

4F

5 KNUCKLE CONCEALED HEAVY WEIGHT

PB

PLAIN BEARING

BB

BALL BEARING

CP

CONCEALED PLAIN BEARING

CB

CONCEALED BEARING

CH

CONTINUOUS 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

RB

RAISED BARREL

RS

RESIDUAL SPRING HINGE

RP

RESIDUAL PLAIN BEARING

SP

SPRING HINGE

SC4B

SWING CLEAR HEAVY WEIGHT

SCPB

SWING CLEAR PLAIN BEARING

SCBB

SWING CLEAR BALL BEARING

WT4B

WIDE THROW HEAVY WEIGHT

WTPB

WIDE THROW PLAIN BEARING

WTBB

WIDE THROW 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

HALF 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