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BRAKE DRUMS
HOW TO MEASURE BRAKE DRUMS
When selecting a replacement drum, the manufacturer’s name and part number is helpful. If this information is not available, a replacement drum can be selected by comparing dimensions. A drawing is shown below which indicates the dimensions required to determine the existence of a replacement drum. If all of the dimensions shown are not available, we must have at least dimensions C, D, E, J, K and O to make a selection.
A. B. C. D. E.
Overall diameter of drum
Dust shield recess diameter, if applicable
Brake surface diameter
Overall depth
Brake surface flat
F.
Depth of dust shield recess Squeeler band thickness
G. H.
Distance from outside of backface to start of taper
I.
Inside finished diameter
J. K. L.
Bolt circle diameter
Pilot Diameter
Outside finished diameter
M. N.
Diameter at taper Backplate thickness
O. Bolt holes: number and size
OTR ™ BRAKE DRUM SPECIFICATIONS
BOLT HOLES & SIZE
BOLT CIRCLE DIA.
PILOT DIA.
OVERALL DEPTH
OTR PN BRAKE SIZE
CROSSES
OTR2501B* 15 x 4 OTR2601B* 16.5 x 7 OTR1501B 15" x 4
10 - 1.35 11.25 8.78 10 - 1.10 11.25 8.78 10 – 1.31 11.25 8.78
9.18 61528B 3721AX 107507 85-123382-002 54201-108 10.60 56864B 3922X 107885 85-123788-002 60000-018 8.86 61528B 3721AX 107507 85-123382-002 54201-108
OTR1502B 15" x 4
10 – 1.31 11.25 8.78
9.04 65548B 3800X 100099920, 10001781 85-123542-002 54293-018
56864 66864B
3922X 3600AX
107885 107885
85-123788-002 85-123207-002 60000-018
OTR1601B 16.5" x 7 10 – 1.00 11.25 8.78
10.54
OTR1602B 16.5" x 7 10 – 1.00 11.25 8.78
10.62 10.62
66884 3576AX 10037819 85-123365-002 54261-018
OTR1603 16.5" x 7
10 – .81
11.25 8.53
66893 3166A 67518 2983CX 62200 2705X
85-122607-002 53026-01 03-122222-002 52230-10 03-012582-002 52020-01
OTR1605 16.5" x 7 5/6 – .78/.66 11.00 9.44
8.38 9.50
OTR1606 16.5" x 7 OTR1607 16.5" x 7 OTR1608B 16.5" x 7 OTR1610 16.5" x 7 OTR1611 16.5" x 7
10 – .81 8 – 1.00 10 – .81 10 – .81 10 – .81
11.25 9.44
10.83 11.25
9 9
10.62 10.62
66875 3141BX 107875 03-123409-002 53033-30 66895 3141X 107904 03-122550-002 52705-30
11.25 9.5 11.25 9.44
8.75
68730 3018AX 60876 3120X
03-122126-002 52327-10 03-120877-002 52877-11
10.75
OTR1612 16.5" x 7 10 – 1.00 11.25 8.78 OTR1613B 16.5" x 5 10 – 1.31 11.25 8.78
11.18 66353F 3757 10080760
54213-01
9.04 65710B 3710X 10020147 85123370002 54238-018 11.10 66800B 3782X 10080760 85-123520-002 54269-018 11.46 66855B 3807X 10012097 85-123570-002 54229-01
OTR1614B 16.5" x 8
10 – 1.00 11.25 8.78
OTR1615B 16.5" x 8.62 10 – 1.00 11.25 8.78 OTR1658B 16.5" x 8.0 10 – 1.00 11.25 8.78
11.10 66800B 3782X 10080760
54269-018
OTR16585B 16.5" x 8.62 10 – 1.00 11.25 OTR1656B 16.5" x 6.0 10 – 1.31 11.25
8.78 8.78 9.00
11.46
66854B 3807X 10012097 85-123570-002 54229-01 65152B 3687X 10033071 85-123399-002 54248-018
9.75
OTR1275B 12.25" x 7.5 8 – 1.00
10.83
11.22
63680F
3887X
54244-01
*Fully machined
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