All Steel
QD Bushings
★F = Length of Mating Bore
★★G = Gap Between QD Bushing and Mating Hub
QD Bushings — Steel
Dimensions (Inches)
Bushing
A
B
D
E
F
G
L
Cap
Bolt
Circle
SF-STL
E-STL
F-STL
J-STL
M-STL
N-STL
⁄16
⁄4
13
⁄16
1
11⁄4
11⁄2
3.125
3.834
4.437
5.148
6.500
7.000
45⁄8
6
65⁄8
71⁄4
9
10
11⁄2
17⁄8
213⁄16
31⁄2
51⁄2
65⁄8
11⁄4
15⁄8
21⁄2
33⁄16
53⁄16
61⁄4
⁄8
⁄8
3
⁄16
3
⁄16
3
⁄16
7
⁄18
21⁄16
25⁄8
35⁄8
41⁄2
63⁄4
81⁄8
37⁄8
5
55⁄8
61⁄4
77⁄8
81⁄2
Bushing
SF-STL
E-STL
F-STL
J-STL
M-STL
N-STL
9
3
Bores
Keyway
23⁄8 - 29⁄16
25⁄8 - 23⁄4
213⁄16 - 27⁄8
215⁄16
7
⁄8 - 27⁄8
215⁄16 - 31⁄4
35⁄16 - 31⁄2
1 - 35⁄16
33⁄8 - 33⁄4
37⁄8 - 315⁄16
4
37⁄16 - 33⁄4
313⁄16 - 41⁄2
2 - 43⁄4
413⁄16 - 51⁄2
21⁄2 - 51⁄8
53⁄16 - 51⁄2
59⁄16 - 57⁄8
⁄8 x 3⁄16
⁄8 x 1⁄16
3
⁄4 x 1⁄16
3
⁄4 x 1⁄32
STD.
3
⁄4 x 1⁄8
7
⁄8 x 1⁄16
STD.
7
⁄8 x 3⁄16
1 x 1⁄8
NONE
STD.
1 x 1⁄8
STD.
11⁄4 x 1⁄4
STD.
11⁄4 x 1⁄4
11⁄2 x 1⁄4
5
5
Key Seat
⁄4 x 1⁄32
1
⁄4 x 1⁄16
3
⁄8 x 1⁄32
3
⁄8 x 1⁄16
3
⁄8 x 1⁄8
1
⁄2 x 1⁄32
1
⁄2 x 1⁄16
1
⁄2 x 1⁄8
5
⁄8 x 1⁄16
3
⁄4 x 1⁄16
1
Key Seat
⁄4 x 1⁄32
1
⁄4 x 1⁄16
3
⁄8 x 1⁄32
3
⁄8 x 1⁄16
3
⁄8 x 1⁄8
1
⁄2 x 1⁄32
1
⁄2 x 1⁄16
1
⁄2 x 1⁄8
5
⁄8 x 1⁄16
5
⁄8 x 3⁄16
1
Bushing
Plain Bores Not Split
SH-STL
SD-STL
SK-STL
SF-STL
E-STL
F-STL
J-STL
M-STL
N-STL
⁄2
⁄2
1
⁄2
115⁄16
7
⁄8 - 115⁄16
1 - 27⁄16 - 215⁄16
17⁄16 - 215⁄16
2 - 215⁄16
27⁄16 - 415⁄16
1
1
1
1
Shallow Key Dimension — Standard
Key
Keyway
⁄4 x 5⁄32
1
⁄4 x 3⁄16
3
⁄8 x 7⁄32
3
⁄8 x 1⁄4
3
⁄8 x 5⁄16
1
⁄2 x 9⁄32
1
⁄2 x 5⁄16
1
⁄2 x 3⁄8
5
⁄8 x 3⁄8
3
⁄4 x 7⁄16
1
⁄4 x 1⁄8
7
⁄8 x 1⁄16
7
⁄8 x 3⁄16
1 x 1⁄8
11⁄4 x 1⁄4
11⁄2 x 1⁄8
11⁄2 x 1⁄4
13⁄4 x 1⁄8
13⁄4 x 1⁄4
2 x 1⁄4
3
⁄4 x 5⁄32
1
⁄4 x 3⁄16
3
⁄8 x 7⁄32
3
⁄8 x 1⁄4
3
⁄8 x 5⁄16
1
⁄2 x 3⁄32
1
⁄2 x 5⁄16
1
⁄2 x 3⁄8
5
⁄8 x 3⁄8
5
⁄8 x 1⁄2
⁄4 x 1⁄16
3
⁄4 x 1⁄8
7
⁄8 x 1⁄16
7
⁄8 x 3⁄16
1 x 1⁄8
11⁄4 x 1⁄4
11⁄2 x 1⁄4
13⁄4 x 1⁄8
13⁄4 x 3⁄8
2 x 1⁄4
3
33⁄8 x 2
31⁄2 x 23⁄4
39⁄16 x 35⁄8
35⁄8 x 41⁄2
43⁄4 x 63⁄4
47⁄8 x 81⁄2
⁄2
⁄8
1
17⁄16
2
21⁄2
1
7
Bores
⁄4 x 1⁄2
7
⁄8 x 1⁄2
7
⁄8 x 5⁄8
1 x 5⁄8
11⁄4 x 7⁄8
11⁄2 x 7⁄8
11⁄2 x 1
13⁄4 x 3⁄4
13⁄4 x 7⁄8
2x1
⁄8
15
⁄16 - 11⁄4
15⁄16 - 13⁄8
17⁄16 - 13⁄4
113⁄16 - 21⁄4
25⁄16 - 23⁄4
213⁄16 - 31⁄4
35⁄16 - 33⁄4
313⁄16 - 41⁄2
49⁄16 - 51⁄2
59⁄16 - 61⁄2
69⁄16 - 71⁄2
79⁄16 - 9
91⁄16 - 11
111⁄16 - 13
3
7
25⁄16
27⁄8
35⁄16
33⁄4
43⁄4
51⁄8
Average
Weight
(Approx.)
213⁄16
31⁄2
4
41⁄2
51⁄2
57⁄8
3.0
10.0
11.5
18.0
37.0
57.0
Standard Keyway and Key Dimension
Keyway
Key
Shallow Key Dimension — Steel
Key
Keyway
1
Screws
Required
Stock Bore Range
Maximum
Standard
Shallow
Minimum
Keyway
Keyway
⁄16 x 3⁄32
1
⁄4 x 1⁄8
5
⁄16 x 5⁄32
3
⁄8 x 3⁄16
1
⁄2 x 1⁄4
5
⁄8 x 5⁄16
3
⁄4 x 3⁄8
7
⁄8 x 7⁄16
1 x 1⁄2
11⁄4 x 5⁄8
11⁄2 x 3⁄4
13⁄4 x 3⁄4
2 x 3⁄4
21⁄2 x 7⁄8
3x1
3
Key
⁄16 x 3⁄16
1
⁄4 x 1⁄4
5
⁄16 x 5⁄16
3
⁄8 x 3⁄8
1
⁄2 x 1⁄2
5
⁄8 x 5⁄8
3
⁄4 x 3⁄4
7
⁄8 x 7⁄8
1x1
11⁄4 x 11⁄4
11⁄2 x 11⁄2
13⁄4 x 11⁄2
21⁄2 x 11⁄2
——
——
3
Key
⁄4 x 7⁄16
3
⁄4 x 1⁄2
7
⁄8 x 1⁄2
7
⁄8 x 5⁄8
1 x 5⁄8
11⁄4 x 7⁄8
11⁄2 x 1
13⁄4 x 3⁄4
13⁄4 x 1
2x1
3
Reborable QD bushings
made of Stainless Steel are
available in many sizes.
Non stock sizes are
available on MTO basis.
B-3
BUSHINGS
B1-B16_B1-B16 1/11/13 5:07 PM Page 3
B1-B16_B1-B16 1/11/13 5:07 PM Page 4
BUSHINGS
Standard
QD Bushings
Dimensions (Inches)
Bushing
A
JA
SH
SDS
SD
SK
SF
E
F
J
M
N
P
W
S
⁄8
⁄16
1
⁄2
1
⁄2
9
⁄16
9
⁄16
3
⁄4
13
⁄16
1
11⁄4
11⁄2
13⁄4
2
31⁄4
B
1.375
1.871
2.187
2.187
2.812
3.125
3.834
4.437
5.148
6.500
7.000
8.250
10.437
12.125
3
7
D
2
211⁄16
33⁄16
33⁄16
37⁄8
45⁄8
6
65⁄8
71⁄4
9
101⁄4
113⁄4
15
173⁄4
E
⁄16
⁄8
7
⁄8
15⁄16
13⁄8
11⁄2
17⁄8
213⁄16
31⁄2
51⁄2
65⁄8
75⁄8
93⁄8
121⁄2
11
7
F
⁄16
⁄16
3
⁄4
11⁄4
11⁄4
11⁄4
15⁄8
21⁄2
33⁄16
53⁄16
61⁄4
71⁄4
9
12
9
13
G
⁄8
⁄8
1
⁄8
1
⁄8
1
⁄8
1
⁄8
1
⁄8
3
⁄16
3
⁄16
3
⁄16
1
⁄4
1
⁄4
1
⁄4
3
⁄8
1
1
L
Bolt
Circle
Cap
Screws
Required
11⁄16
15⁄16
13⁄8
113⁄16
115⁄16
21⁄16
25⁄8
35⁄8
41⁄2
63⁄4
81⁄8
93⁄8
113⁄8
153⁄4
1.665
21⁄4
211⁄16
211⁄16
35⁄16
37⁄8
5
55⁄8
61⁄4
77⁄8
81⁄2
10
123⁄4
15
3-10 x 1
3-1⁄4 x 13⁄8
3-1⁄4 x 13⁄8
3-1⁄4 x 17⁄8
3-5⁄16 x 2
3-3⁄8 x 2
3-1⁄2 x 23⁄4
3-9⁄16 x 35⁄8
3-5⁄8 x 41⁄2
4-3⁄4 x 63⁄4
4-7⁄8 x 81⁄2
4-1 x 91⁄2
4-11⁄8 x 111⁄2
5-11⁄4 x 151⁄2
Bores
Keyway
⁄8 - 7⁄16
1
⁄2 - 1
11⁄18 - 11⁄8
13⁄16
11⁄4
1
⁄2 - 13⁄8
17⁄16 - 11⁄2
19⁄16 - 15⁄8
111⁄16
1
⁄2 - 111⁄16
13⁄4
113⁄16
17⁄8 - 115⁄16
2
1
⁄2 - 111⁄16
13⁄4
113⁄16
17⁄8
115⁄16
2
1
⁄2 - 21⁄8
23⁄16 - 21⁄4
25⁄16 - 21⁄2
29⁄16 - 25⁄8
1
⁄2 - 21⁄4
25⁄16 - 21⁄2
29⁄16 - 23⁄4
213⁄16 - 27⁄8
215⁄16
7
⁄8 - 27⁄8
215⁄16 - 31⁄4
33⁄8 - 31⁄2
35⁄16
1 - 35⁄16
33⁄8 - 33⁄4
37⁄8 - 315⁄16
4
11⁄4 - 33⁄4
313⁄16 - 41⁄2
2 - 43⁄4
413⁄16 - 51⁄2
27⁄16 - 5
51⁄8 - 51⁄2
59⁄16 - 6
215⁄16 - 515⁄16
6 - 61⁄2
69⁄16 - 7
4 - 71⁄2
79⁄16 - 81⁄2
NO K.W.
STD.
1
⁄4 - 1⁄16
1
⁄4 - 1⁄16
NO K.W.
STD
3
⁄8 x 1⁄16
3
⁄8 - 1⁄16
NO K.W.
STD.
3
⁄8 x 1⁄8
1
⁄2 x 1⁄8
1
⁄2 x 1⁄16
NO K.W.
STD.
3
⁄8 x 1⁄8
1
⁄2 x 1⁄8
1
⁄2 x 1⁄16
1
⁄2 x 1⁄16
NO K.W.
STD.
1
⁄2 x 1⁄8
5
⁄8 x 1⁄16
NO K.W.
STD.
5
⁄8 x 3⁄16
5
⁄8 x 1⁄16
3
⁄4 x 1⁄16
3
⁄4 x 1⁄32
STD.
3
⁄4 x 1⁄8
7
⁄8 x 1⁄16
7
⁄8 x 1⁄8
STD.
7
⁄8 x 3⁄16
1 x 1⁄8
NONE
STD.
1 x 1⁄8
STD.
11⁄4 x 1⁄4
STD.
11⁄4 x 1⁄4
11⁄2 x 1⁄4
STD.
11⁄2 x 1⁄4
13⁄4 x 1⁄8
STD.
2 x 1⁄4
3
JA
SH
SDS
SD
SK
SF
E
F
J
M
N
P
W
Keystock provided for nonstandard keyways.
B-4
⁄8
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
7
⁄8
1
17⁄16
115⁄16
27⁄16
215⁄16
4
6
3
1
1
13⁄8
111⁄16
111⁄16
21⁄8
25⁄16
27⁄8
35⁄16
33⁄4
43⁄4
51⁄8
515⁄16
71⁄2
81⁄4
11⁄4
111⁄16
2
115⁄16
21⁄2
213⁄16
31⁄2
315⁄16
41⁄2
51⁄2
6
7
81⁄2
10
Set Screw
Size
Average
Weight
(Approx.)
10-24
1
⁄4
1
⁄4
1
⁄4
5
⁄16
5
⁄16
3
⁄8
1
⁄2
5
⁄8
3
⁄4
3
⁄4
7
⁄8
1
11⁄4
.9
1
1
1.5
2
3
10
11.5
18
37
57
120
250
400
Millimeter Bore
Inch Bore
Bushing
Stock Bore Range
Maximum
Standard
Shallow
Minimum
Keyway
Keyway
Bushing
SH
SDS
SD
SK
★Important — The metric system does not refer to
keyseat or keyway dimensions as does the
English system; instead dimensions are given for
the key itself which is rectangular in shape, not
square as in the English system.
NOTE:
.03937 =1mm
Ex—24 mm = 0.94488
SF
TO ORDER:
SH 24 mm
E
F
J
Bore
MM
Key★
WXT
24, 25
28, 30
32, 35
24, 25
28, 30
32, 35
38
40, 42
24, 25
28, 30
32, 35
38
40, 42
24, 25
28, 30
32, 35
38
40, 42
48, 50
55
28, 30
32, 35
38
40, 42
48, 50
55
60
35, 38
40, 42
48, 50
55
60, 65
70, 75
48, 50
55
60, 65
70, 75
80, 85
90
50
55
60, 65
70, 75
80, 85
90, 95
100
8x7
10x8
8x7
10x8
12x8
8x7
10x8
12x8
8x7
10x8
12x8
14x9
16x10
8x7
10x8
12x8
14x9
16x10
18x11
10x8
12x8
14x9
16x10
18x11
20x12
14x9
16x10
18x11
20x12
22x14
25x14
14x9
16x10
18x11
20x12
22x14
25x14
28x16
QD & QD Short
Weld-On Hubs
QD Weld-On Hubs
Martin QD Weld-On Hubs are suitable for use in
many applications, such as welding to plate steel
sprockets.
QD Weld-On Hubs are made of steel, drilled, tapped
and taper bored for QD bushings
35º
45º
L
15º
L
L1
D
D
P
B
B
TYPE 1
BC
BC
TYPE 2
Catalog
Number
D★
L
JA-A
SH-A
SDS-A
SK-A
SF-A
E-A
F-A
J-A
M-A
N-A
P-A
W-A
2.250
3.000
3.500
4.375
5.000
6.250
7.000
7.750
9.500
10.500
13.000
15.500
⁄
⁄
⁄
1⁄
11⁄4
15⁄8
21⁄2
33⁄16
53⁄16
61⁄4
71⁄4
9
9
16
13
16
3
4
1
4
TYPE 3
Dimensions — Inches
B (nom)
P
1.37
1.87
2.18
2.81
3.12
3.83
4.44
5.14
6.49
6.99
8.24
10.43
2.125
—
—
—
—
—
—
—
9.250
10.250
—
—
★Tolerance of D Dimension (or P dimension where applicable)
BC
L1
BC
Type
Drilling
⁄16
—
—
—
—
—
—
—
39⁄16
41⁄2
—
—
1 ⁄32
21⁄4
211⁄16
35⁄16
37⁄8
5
55⁄8
61⁄4
77⁄8
81⁄2
10
123⁄4
1
1
1
1
1
1
1
1
2
2
2
2
3
21
JA-A Thru J-A = (+.000-.002)
Weight
Pounds
Mounting
STD or
Reverse
Mount
.4
1
1.2
3
4
9
16
22.5
50
75
155
300
STD
Mount
Only
M-A Thru S-A = (+.000-.003)
QD Short Weld-On Hubs
L1
L
D
Martin QD Short
B
P
Weld-On Hubs are
designed for use in
conveyor pulleys.
BC
Catalog
Number
D
L
SFS-A
ES-A
FS-A
JS-A
MS-A
NS-A
PS-A
WS-A
SS-A
5.000
6.250
7.000
8.250
9.500
10.250
12.250
15.250
17.500
1
11⁄8
11⁄4
15⁄8
23⁄8
23⁄8
27⁄8
33⁄8
37⁄8
★Tolerance of P Dimension
TYPE 2
Dimensions — Inches
B (nom)
P*
3.12
3.83
4.44
5.14
6.49
6.99
8.24
10.43
12.12
SFS-A Thru MS-A = (+.000-.004)
BC
BC
TYPE 1
4.750
6.000
6.750
8.000
9.250
10.000
12.000
14.875
17.000
TYPE 3
L1
BC
Type
Drilling
Weight
Pounds
⁄16
5
⁄8
11
⁄16
1
15⁄8
19⁄16
2
2 7⁄16
23⁄4
37⁄8
5
55⁄8
61⁄4
77⁄8
8 1⁄2
10
123⁄4
15
1
1
1
1
2
2
2
2
3
3.0
5.5
7.4
13.8
22.9
26.8
47.9
84.2
121.8
9
NS-A Thru PS-A = (+.000-.005)
Mounting
Reverse
Mount
Only
WS-A Thru SS-A = (+.000-.006)
B-5
BUSHINGS
B1-B16_B1-B16 1/11/13 5:07 PM Page 5
B1-B16_B1-B16 1/11/13 5:07 PM Page 6
BUSHINGS
QD Short
Bushings
Inch Bore
Bushing
JS
MS
NS
PS
WS
B-6
Bores
27⁄16
215⁄16
37⁄16
31⁄2
315⁄16
47⁄16
37⁄16
31⁄2
315⁄16
47⁄16
415⁄16
57⁄16
51⁄2
315⁄16
47⁄16
415⁄16
57⁄16
51⁄2
515⁄16
6
415⁄16
57⁄16
515⁄16
6
67⁄16
61⁄2
615⁄16
7
57⁄16
515⁄16
6
67⁄16
61⁄2
615⁄16
7
71⁄2
715⁄16
8
87⁄16
81⁄2
Keyway
⁄8 x 5⁄16
⁄4 x 3⁄8
5
3
⁄ x 7⁄16
78
1 x 1⁄8
⁄8 x 7⁄16
7
1 x 1⁄2
11⁄4 x 1⁄4
1 x 1⁄2
11⁄4 x 5⁄8
11⁄4 x 1⁄4
11⁄2 x 1⁄4
11⁄4 x 5⁄8
11⁄2 x 3⁄4
11⁄2 x 1⁄4
13⁄4 x 1⁄8
11⁄4 x 5⁄8
11⁄2 x 3⁄4
13⁄4 x 3⁄4
2 x 1⁄4
Martin QD Short Bushings
Weight
19
17
15
15
13
10
38
37
34
30
26
21
20
54
49
43
38
37
31
30
76
70
62
62
55
54
47
45
154
145
144
136
135
126
125
114
106
105
94
93
are suitable for use in belt
conveyor applications
wherever the short hubs
of a conveyor pulley
require the QD Short
Bushing style.
Dimensions
Dimensions (Inches)
Bushing
A
JS
1.00
MS
B
D
E
L
Bolt
Circle
5.1484
7.25
2.38
3.38
6.25
1.19
6.5000
9.00
3.62
4.81
7.88
NS
1.50
7.0000
10.00
4.50
6.00
8.50
PS
1.50
8.2500
11.75
5.00
6.50
WS
1.75
10.4370
15.00
5.50
7.25
All dimensions are in inches, weight in pounds.
Cap
Screws
Requirred
Set
Screw
Size
⁄8 x 21⁄2 (3)
5
3
⁄4 x 3 (4)
3
⁄8 x 31⁄2 (4)
3
10.00
1 x 4 (4)
7
12.75
11⁄8 x 5 (4)
1
5
7
⁄8
⁄4
⁄4
⁄8