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Pneumatic Spring Applied Brakes

PFS520 Pneumatic Spring Applied Brake
PFS520 Series Pneumatic Spring Applied Brake
Salient Characteristics
- 90 PSI Retractable Release Pressure | Aluminum Construction | Dual Belleville Disc Spring Stacks | Quick Change Pad Feature | Fits on Brake Discs Diameters from 20 inches to Unlimited Diameter | .45 Coefficient of Friction Pad #9511023 | Non-Asbestos Friction Material | Spring Stacks in Parallel | Buna-N Seals | 6,419 lb. Maximum Tangential Force | 110,325 in. lbs. F using 40 inch Disc Diameter | 14,264 lb. Clamping Force


Specifications
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Showing Imperial Measurements - Switch to Metric Measurements
PFS47 Series
- Single Belleville Disc Spring Stack | 465 lb. Tangential Force at zero friction pad wear | 6570 in. lbs. F. using 30 inch disc diameter at maximum tangential force | 4.10 sq. in. total friction pad area | 1033 lb. clamping force | Unlimited disc diameter
PFS200 Series
- Dual Belleville Disc Spring Stacks | 929 lb. Tangential Force at zero friction pad wear | 6626 in. lbs. F. using 16 inch disc diameter at maximum tangential force | 8.19 sq. in. total friction pad area | Up to 16 inch disc diameter
PFS200EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 929 lb. Tangential Force at zero friction pad wear | 13,129 in. lbs. F. using 30 inch disc diameter at maximum tangential force | 2065 lb. clamping force | 23.89 sq. in. total friction pad area | 7.72 cu. in. of wearable material | From 12 inch to unlimited disc diameter
PFS200UL Unlimited Disc Series
- Dual Belleville Disc Spring Stacks | 929 lb. Tangential Force at zero friction pad wear | 13,129 in. lbs. F. using 30 inch disc diameter at maximum tangential force | 8.19 sq. in. total friction pad area | Unlimited disc diameter
PFS400 Series
- Dual Belleville Disc Spring Stacks | 1859 lb. Tangential Force at zero friction pad wear | 35,568 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 18371 N. clamping force | 8.19 sq. in. total friction pad area
PFS400EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 1859 lb. Tangential Force at zero friction pad wear | 35,568 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 18371 N. clamping force | 23.89 sq. in. total friction pad area | 7.72 cu. in. of wearable material | From 12 inch to unlimited disc diameter
PFS520 Series
- Dual Belleville Disc Spring Stacks | 6,118 lb. Tangential Force at zero friction pad wear |110,325 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 13,596 lb. clamping force | 47.0 sq. in. total friction pad area | Brake disc diameter starting at 20 inches up to unlimited diameter
PFS522 Series
- Dual Belleville Disc Spring Stacks | 12,236 lb. Tangential Force at zero friction pad wear | 220,651 in. lbs. F. using 40 inch disc diameter at maximum tangential force | 27,192 lb. clamping force | 47.0 sq. in. total friction pad area | Brake disc diameter starting at 20 inches up to unlimited diameter
Special Note.
Friction pad wear effects braking torque. Therefore, PFS series caliper brakes should not be used for tensioning or high cyclic stop applications.
Showing Metric Measurements - Switch to Imperial Measurements
PFS47 Series
- Single Belleville Disc Spring Stack | 2068 N. Tangential Force at zero friction pad wear | 742 Nm. using 762 mm. disc diameter at maximum tangential force | 26.45 sq.cm. total friction pad area | 232 N. clamping force | Unlimited disc diameter
PFS200 Series
- Dual Belleville Disc Spring Stacks | 4132 N. Tangential Force at zero friction pad wear | 749 Nm. using 406 mm. disc diameter at maximum tangential force | 52.84 sq.cm. total friction pad area | Up to 406 mm disc diameter
PFS200SUL Unlimited Disc Series
- Dual Belleville Disc Spring Stacks | 4132 N. Tangential Force at zero friction pad wear | 1483 Nm. using 762 mm. disc diameter at maximum tangential force | 9186 N. clamping force | 52.84 sq.cm total friction pad area | Unlimited disc diameter
PFS200EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 4132 N. Tangential Force at zero friction pad wear | 1483 Nm. using 762 mm. disc diameter at maximum tangential force | 9186 N. clamping force | 154.13 sq.cm. total friction pad area | 126 cu.cm. of wearable material | From 305 mm to unlimited disc diameter
PFS400 Series
- Dual Belleville Disc Spring Stacks | 8269 N. Tangential Force at zero friction pad wear | 4018 Nm. using 1016 mm. disc diameter at maximum tangential force | 18,379 N. clamping force | 154.13 sq. cm. total friction pad area | Unlimited disc diameter
PFS400EP Extended Pad Series
- Dual Belleville Disc Spring Stacks | 8269 N. Tangential Force at zero friction pad wear | 4018 Nm. using 1016 mm. disc diameter at maximum tangential force | 18,379 N. clamping force | 154.13 sq.cm. total friction pad area | 126 cu. cm. of wearable material | From 305 mm. to unlimited disc diameter
PFS520 Series
- Dual Belleville Disc Spring Stacks | 28,565 N. Tangential Force at zero friction pad wear | 12,465 Nm. using 1016 mm. disc diameter at maximum tangential force | 63,475 N. clamping force | 303.23 sq.cm. total friction pad area | Brake disc diameter starting at 508 mm. up to unlimited diameter
PFS522 Series
- Dual Belleville Disc Spring Stacks | 54,428 N. Tangential Force at zero friction pad wear | 24,929 Nm. using 1016 mm. disc diameter at maximum tangential force | 120,956 N. clamping force | 303.23 sq.cm total friction pad area | Brake disc diameter starting at 508 mm. up to unlimited diameter
Special Note.
Friction pad wear effects braking torque. Therefore, PFS series caliper brakes should not be used for tensioning or high cyclic stop applications.
Products Available - PFS520 Series
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Product # |
Name |
Description |
Additional Info |
Disc Thick. (in.) |
Tangential Force |
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4252-0093 |
PFS520SE |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
1/2 |
6419 lbf, 28565 N |
 |
4252-0094 |
PFS520SJ |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
5/8 |
6419 lbf, 28565 N |
 |
4252-0095 |
PFS520ST |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
3/4 |
6419 lbf, 28565 N |
 |
4252-0096 |
PFS520SO |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
1.0 |
6419 lbf, 28565 N |
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4252-0097 |
PFS520SQ |
Single Acting, Floating Mount. Use Fixed Disc |
Dual Pistons. Spring Applied 75 PSI Rel. |
1-1/8 |
6419 lbf, 28565 N |
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