21 SERIES LIGHT MEDIUM DUTY CASTERS
Heavy embossed, formed steel double cup.
Double row ball bearing swivel raceway.
Raceway and yoke hardened for extra strength.
Dust cover helps protect swivel bearing.
Bright zinc or chrome plated finish.
Octal Top Raceway is available.
FASTENING SPECIFICATIONS
FASTENING TYPE
FASTENING SHAPE
CODE NO
SPECIFICATIONS
TOP PLATE
A1
OVERALL SIZE : 2-1/2x3-5/8
BOLT HOLE SPACING : 1-3/4x2-7/8 to 3
ATTACHING BOLT SIZE : 5/16
A2
OVERALL SIZE : 3-1/8x4-1/8
BOLT HOLE SPACING : 1-3/4x3 to 2-3/8x3-3/8
ATTACHING BOLT SIZE : 3/8
A3
OVERALL SIZE : 3-15/16x4-1/2
BOLT HOLE SPACING : 2-5/8x3-5/8 to 3x3
A4
OVERALL SIZE : 3-1/2x3-1/2
BOLT HOLE SPACING : 2-7/16x2-7/16
ATTACHING BOLT SIZE : 1/4
THREADED STEM
B1
1/2xUNC13x1-1/2
B2
1/2xUNC13x2-3/4 (Can be used with Exp Applicator)
SQUARE STEM
C1
7/8x2 - 1/4" hole, up 1 from top of the upper caster.
C2
7/8x2-1/2 - 1/4" hole, up 2 - 1/8 from top of the upper caster.
GRIP RING STEM
D1
7/8x2-7/16
D2
27/32x2-1/2
D4
ACCESSORIES OPTIONS
ACCESSORIES CODE
DESCRIPTION
TB
TG
ZA
SL
EP
CP
NI
TOP LOCK BRAKE
THREAD GUARD
ZERK AXLE
SEALED SWIVEL
EXPENDED APPLICATOR
CHROME PLATING
NICKEL PLATING
21 SERIES SPECIFICATIONS
CASTER PART NUMBER
WHEEL SPECIFICATION
CASTER SPECIFICATION
SWIVEL
RIGID
DIA
TREAD WIDTH
TYPE
BEARING
AXLE DIA
OVERALL HEIGHT
SWIVEL RADIUS
LOAD CAPACITY
21 30 S A1 SR
21 30 S A1 SBB
21 30 S A1 HR
21 30 S A1 HBB
21 30 S A1 LP
21 30 S A1 HP
21 30 S A1 PU
21 30 S A1 PB
21 30 S A1 INF
21 30 S A1 SS
21 30 R A1 SR
21 30 R A1 SBB
21 30 R A1 HR
21 30 R A1 HBB
21 30 R A1 LP
21 30 R A1 HP
21 30 R A1 PU
21 30 R A1 PB
21 30 R A1 INF
21 30 R A1 SS
3
1-1/4
SOFT RUBBER
HARD RUBBER
LIGHT DUTY PLASTIC
HEAVY DUTY PLASTIC
POLYURETHANE
INFINITE
STEEL
NYLON
BALL
PLAIN
BALL/DELRIN
ANNULAR/DELRIN
3/8
4-1/4
125
220
300
155
250
21 35 S A1 SR
21 35 S A1 HR
21 35 S A1 HP
21 35 S A1 PB
21 35 S A1 INF
21 35 S A1 RA
21 35 R A1 SR
21 35 R A1 HR
21 35 R A1 HP
21 35 R A1 PB
21 35 R A1 INF
21 35 R A1 RA
3-1/2
GRAY RUBBER ON ALUMINUM
ANNULAR
4-11/16
3-1/16
130
225
260
21 40 S A1 SR
21 40 S A1 SBB
21 40 S A1 HR
21 40 S A1 HBB
21 40 S A1 LP
21 40 S A1 HP
21 40 S A1 PB
21 40 S A1 RA
21 40 S A1 INF
21 40 S A1 SS
21 40 R A1 SR
21 40 R A1 SBB
21 40 R A1 HR
21 40 R A1 HBB
21 40 R A1 LP
21 40 R A1 HP
21 40 R A1 PB
21 40 R A1 RA
21 40 R A1 INF
21 40 R A1 SS
4
5-1/8
3-5/16
165
265
275
240
21 50 S A1 SR
21 50 S A1 SBB
21 50 S A1 HR
21 50 S A1 HBB
21 50 S A1 LP
21 50 S A1 HP
21 50 S A1 PB
21 50 S A1 INF
21 50 S A1 RA
21 50 R A1 SR
21 50 R A1 SBB
21 50 R A1 HR
21 50 R A1 HBB
21 50 R A1 LP
21 50 R A1 HP
21 50 R A1 PB
21 50 R A1 INF
21 50 R A1 RA
5
6-7/32
3-31/32
175
230
320
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