11/4" x 21/2" SERIES HEAVY DUTY BRAKE DISC

Specifications
A diam
Max
Weight
Act. Rad.
WR2
Single Stop Energy Absorb.
inch mm RPM lbs Kgs Ft m lb-ft2 kg-m2 hp-sec KJ
12 305 4600 19 9 0.39 0.12 2.5 0.11 1500 1100
15 381 3650 27 12 0.52 0.15 6 0.25 1900 1400
18 457 3000 37 17 0.65 0.19 12 0.51 2300 1700
21 533 2550 50 23 0.77 0.23 23 0.97 2900 2200
24 610 2250 64 29 0.89 0.27 39 1.64 3400 2500
27 686 1980 79 36 1.02 0.31 60 2.53 3700 2800
30 762 1780 99 45 1.14 0.34 94 3.96 4400 3300

B max diam
Max
Weight
Act. Rad.
WR2
Single Stop Energy Absorb.
inch mm RPM lbs Kgs Ft m lb-ft2 kg-m2 hp-sec KJ
4.5 114 4600 19 9 0.39 0.12 2.5 0.11 1500 1100
7.5 191 3650 27 12 0.52 0.15 6 0.25 1900 1400
10.5 267 3000 37 17 0.65 0.19 12 0.51 2300 1700
13.5 343 2550 50 23 0.77 0.23 23 0.97 2900 2200
16.75 425 2250 64 29 0.89 0.27 39 1.64 3400 2500
19.5 495 1980 79 36 1.02 0.31 60 2.53 3700 2800
22.75 578 1780 99 45 1.14 0.34 94 3.96 4400 3300

C min diam
Max
Weight
Act. Rad.
WR2
Single Stop Energy Absorb.
inch mm RPM lbs Kgs Ft m lb-ft2 kg-m2 hp-sec KJ
2.0 51 4600 19 9 0.39 0.12 2.5 0.11 1500 1100
2.5 64 3650 27 12 0.52 0.15 6 0.25 1900 1400
3.0 76 3000 37 17 0.65 0.19 12 0.51 2300 1700
3.5 89 2550 50 23 0.77 0.23 23 0.97 2900 2200
4.0 102 2250 64 29 0.89 0.27 39 1.64 3400 2500
4.0 102 1980 79 36 1.02 0.31 60 2.53 3700 2800
4.5 114 1780 99 45 1.14 0.34 94 3.96 4400 3300

D max diam
Max
Weight
Act. Rad.
WR2
Single Stop Energy Absorb.
inch mm RPM lbs Kgs Ft m lb-ft2 kg-m2 hp-sec KJ
3.75 95 4600 19 9 0.39 0.12 2.5 0.11 1500 1100
5 127 3650 27 12 0.52 0.15 6 0.25 1900 1400
6 152 3000 37 17 0.65 0.19 12 0.51 2300 1700
9 229 2550 50 23 0.77 0.23 23 0.97 2900 2200
8 203 2250 64 29 0.89 0.27 39 1.64 3400 2500
12 305 1980 79 36 1.02 0.31 60 2.53 3700 2800
10 254 1780 99 45 1.14 0.34 94 3.96 4400 3300

Note: WR2 and Weight may vary due to machining.


The graph below indicates the horsepower handling capacity of the brake discs in relation to various RPMS.  Please note that the horsepower capacity drastically increases when the disc goes from laminar to turbulent flow.  The energy indicated is based on a continuous input with a maximum disc temperature of 600oF (315oC) and does not require any stopping or brake release time.  It is important to remember that disc brake installations running on continuous power input should not exceed 700oF (370oC) disc temperature.
Graph HP vs RPM
MAXIMUM ENERGY CAPACITY FOR A SINGLE STOP FROM CRITICAL RPM (LAMINAR FLOW)
Maximum Temperature 700oF (370oC)
Disc
Critical rpm
1 sec
2 sec
5 sec
hp-sec
kJ
hp-sec
kJ
jp-sec
kJ
1.25 x 2.5 x 12 1952 990 740 1450 1050 1488 1110
1.25 x 2.5 x 15 1483 1300 970 1849 1380 1881 1400
1.25 x 2.5 x 18 1196 1620 1210 2293 1710 2317 1730
1.25 x 2.5 x 21 1002 1935 1440 2737 2040 2881 2150
1.25 x 2.5 x 24 875 2250 1680 3181 2370 3401 2540
1.25 x 2.5 x 27 685 2560 1910 3624 2700 3722 2780
1.25 x 2.5 x 30 674 2877 2150 4068 3030 4449 3320

MAXIMUM ENERGY CAPACITY FOR A SINGLE STOP FROM CRITICAL RPM (LAMINAR FLOW)
Maximum Temperature 700oF (370oC)
Disc
Critical rpm
10 sec
30 sec
1 min
hp-sec
kJ
hp-sec
kJ
jp-sec
kJ
1.25 x 2.5 x 12 1952 1500 1120 1574 1150 1622 1210
1.25 x 2.5 x 15 1483 1897 1410 1962 1460 2061 1540
1.25 x 2.5 x 18 1196 2337 1740 2416 1800 2540 1890
1.25 x 2.5 x 21 1002 2905 2170 2996 2230 3135 2340
1.25 x 2.5 x 24 875 3428 2560 3535 2640 3700 2760
1.25 x 2.5 x 27 685 3748 2800 3860 2880 4033 3010
1.25 x 2.5 x 30 674 4482 3340 4619 3440 4822 3600

MAXIMUM ENERGY CAPACITY FOR A SINGLE STOP FROM CRITICAL RPM (LAMINAR FLOW)
Maximum Temperature 700oF (370oC)
Disc
Critical rpm
2 min
5 min
10 min
hp-sec
kJ
hp-sec
kJ
jp-sec
kJ
1.25 x 2.5 x 12 1952 1779 1330 2210 1650 2963 2210
1.25 x 2.5 x 15 1483 2274 1700 2858 2130 3860 2880
1.25 x 2.5 x 18 1196 2803 2090 3528 2630 4768 3560
1.25 x 2.5 x 21 1002 3440 2570 4265 3180 5702 4250
1.25 x 2.5 x 24 875 4058 3030 5028 3750 6736 5020
1.25 x 2.5 x 27 685 4400 3280 5401 4030 7170 5350
1.25 x 2.5 x 30 674 5263 3920 6478 4830 8634 6440

The calculations indicating disc temperature or energy capability are based on the rubbing face and the find of the disc only.  The mounting flange of the disc and the rotating element that the disc is attached to are not considered in our calculations.  Also in air flow we have allowed for some restrictions because normally guards and obstructions are imposed to the air flow in most instances.  Because of this, in many cases up to three times more energy can be absorbed by the disc, but since all of these items are unknown to us, we feel that we must offer the utmost in security, as far as brake performance  is concerned.  If specific details are available of your brake installation, we will be please to do a computer run and give you precise performance criterias.

If a brake disc and brake caliper are properly selected, many years of trouble-free service can be expected.  Early disc failure can occur if for example a disc cycles continuously, and goes from extremely hot to cold conditions constantly, (metal fatigue).  Because of these constant thermo-stresses, heat checks will occur and major cracks will appear after some time of operation.  If a brake disc and brake caliper are properly selected, this can all be avoided.

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