501 - A. Counterbalance

Helical torsion spring (3.375” ID) is factory calibrated and lubricated to ensure trouble-

free performance and unparalleled cycle life.

Superior engineering means greatly reducing

spring maintenance along with faster and easier

installation.

501 - B. Drum/Locating Collars

In order to meet the tough demands of self

storage, the 9.5” diameter 18-gauge drums

are furnished with locating collars and are

permanently welded to the drive axle. This also

makes installation faster while providing a positive

location for the mounting brackets and guides.

501 - C. Shaft

The heavy duty 1-5/16” (1.3125”) OD 12-gauge axle

pipe provides maximum strength and durability.

Barrel Assembly

502 - A. Counterbalance:

Helical torsion spring (3.375” ID) is factory

calibrated and lubricated to ensure trouble-free

performance and unparalleled cycle life. Springs

are pre-stretched and permanently attached in

the factory, minimizing field installation labor

while guaranteeing proper operational tolerances.

Ratcheting tension adjuster is standard on the

Model 502.

502 - B. Drums:

Utilizing US Door’s Commercial door designs, the

Model 502 has galvanized 18-gauge drums with

roller bearings permanently installed as standard.

These drums rotate around the shaft, effortlessly

opening and closing the door the same every time.

These doors pass our standard 60,000 cycle test,

and keep on working.

502 - C. Shaft:

A helically wound galvanized barrel surrounds the

shaft and drum assembly for the full width of the

door, providing maximum strength against deflection

while fully enclosing the spring assembly of the

door. Designed for light commercial applications and

residential workshops the Model 502 is aesthetically

Curtain Assembly

D. Finish Coat

These door curtains are pre-finished with a base coat primer to ensure long term adhesion and durability. This ensures the medium gloss silicone polyester premium top coat keeps your facility looking better with minimal maintenance. The finish is guaranteed against chalking and fading for 20 years with 22 standard colors available.

E. Operation

Standard operation of doors by means of push-up operation, meets the American Disability Association standards for Accessible Design for Opening Force requirement.

F. Curtain

Our self-storage doors are manufactured from precision roll-formed 26 gauge pretreated, galvanized and pre-painted commercial quality 80 ksi steel panels that are mechanically seamed together for a tough and durable curtain. A standard 1-inch self-lubricating polypropylene wear strip is stapled uniformly to the exteriors of the door to protect against nesting and metal-to-metal contact and resulting in ultra-smooth and quiet operation.

G. Curtain Stop

Wrap around stop mounted on guide positively stops the door in the open position every time. Adjustable to allow vertically positive stopping at your desired height.

Brackets & Guides

501 - H. Brackets

In order to meet the tough demands of self storage, our brackets are made of 14-gauge hot-dipped galvanized steel; and are furnished with standard low friction nylon bushings to provide smooth, trouble-free operation for years to come. Optional steel bearings and ratcheting tension device are also available.

502 H: Brackets

The Model 502 mounting brackets, made of the same 14 gauge hot-dipped galvanized steel, securely lock the shaft assembly in place. The standard ratchet

tension adjuster is safely located between the bracket and the drum assembly, providing maximum protection for the installer and end-user alike.

I. Guides

Our guides are made from galvanized steel with a polypropylene strip attached to the inside edge allowing for many years of quiet operation. Guides are precision punched and roll formed to the highest standards of quality and consistency. Designed with the customer in mind, one guide type is suitable for all jamb types. Steel, wood, or masonry, every door is the same. Fasteners are securely hidden inside the track, yet carefully positioned away from the travel of the curtain No rubbing, no pinching, no metal-to-metal contact, this guide design is ideal for all applications.

J. Polypropylene Wear Strip

One-inch wide strips are stapled along both edges of the curtain to prevent steel-to-steel contact between the curtain and guide for smoother and quieter door operation. The same wear strip as used on our commercial roll-ups up to 20' x 16', this edge provides a quieter operation while ensuring the door rolls the same time after time.

K. Bottom Bar / Bottom Astragal

A precision extruded aluminum bottom bar reinforced with a heavy duty galvanized structural angle, providing maximum door strength and more aesthetic appeal. A flexible full-bulb type PVC astragal provides for long-term weather resistance and consistent closure to the finished door.

L. Lift Handle

Our heavy duty lift handles provide both a handle for easier opening and a step plate for closing. A heavy duty polypropylene pull rope is also attached to the inside reinforcing steel angle for maximum safety and convenience.

M. Latch

Factory installed zinc-plated slide lock with standard provisions for two padlocks. Optional cylinder locks and stainless steel are available.