Gortite® Sewn Bellows – Custom Covers

Product Details

Sewn bellows help keep abrasive grit, impinging chips, and coolant off of machine ways and ball screws. Sewn bellows boots are ideal for protecting hydraulic cylinder rods, shafts and splines. Using a bellows cover is essential for mitigating damage to actuators and motion components, thus maintaining uptime.

Shapes & Applications

Materials & Accessories

Featured Application: Hydraulic Cylinder Protection

CAD Viewer Instructions

To access the CAD viewer/configuration tool, click on the CAD Viewer link at the top of the page, underneath the “Download Literature” button
New users must register for the first time using a valid company name and email (returning users may need to log in depending on browser cache settings)
If using the request for quote feature, please describe your application and environment in the Special Requests section of the form. The information needed for quotation is on Dynatect’s Enclosed Bellows Quote Request form
Upon receipt of your request, a Client Solutions Engineer or a local Dynatect Sales Representatives will contact you to review your application

Sewn Material Choices (CAD Viewer Tool)

This table represents the choices from the CAD viewer

Material Name	Color	Coating	Base	Nominal Thickness (inches)	Application and Resistance Notes
Aluminized Fiberglass, 0.025	Silver	Aluminum foil	Fiberglass	0.025	High temperatures; weld spatter and spark resistance; used in furnace/exhaust connections with little to no movement. Not for high-cycles.
Aluminized Para-Aramid, 0.020	Silver	Aluminum foil	Para-Aramid	0.020	High ambient temperatures; Weld spatter and spark resistance; Puncture-resistance; High-cycle durability
Aluminized Para-Aramid, 0.045	Silver	Aluminum foil	Para-Aramid	0.045	High ambient temperatures; Weld spatter and spark resistance; Puncture-resistance; High-cycle durability; Heavy-duty material; Steel mill applications; minimum 1.5" convolution height for bellows
Butyl/Nylon, 0.018	Black	Butyl	Nylon	0.018	Resistance to a variety of acids and non-flammable hydraulic fluids. Caution with: abrasion, chips
Chloroprene/Fiberglass, 0.027	Black	Chloroprene	Fiberglass	0.027	Oil resistant properties; Standard hot chip or spark applications
Chloroprene/Nylon, 0.018	Black	Chloroprene	Nylon	0.018	Standard industrial applications. Moderate resistance to chemicals and acids, ozone, oils, fats, greases, many oils, and solvents. Moderate resistance to petroleum-based fluids. Good weathering resistance. Attacked by: Strong oxidizing acids, esters, ketones, chlorinated, aromatic and nitro hydrocarbons.
Chloroprene/Nylon, 0.033	Black	Chloroprene	Nylon	0.033	Standard industrial applications. Moderate resistance to chemicals and acids, ozone, oils, fats, greases, many oils, and solvents. Moderate resistance to petroleum-based fluids. Good weathering resistance. Attacked by: Strong oxidizing acids, esters, ketones, chlorinated, aromatic and nitro hydrocarbons.
Chloroprene/Polyester, 0.018	Black	Chloroprene	Polyester	0.018	Standard industrial applications, oil resistance, FR Rated UL-94-VTM-0. Conductive.
Goralon/Nylon, 0.065	Blue gray	Goralon / CSM (Chlorosulfonated Polyethylene)	Nylon	0.065	Heavy-duty/rigid material; Excellent ozone, weathering, and acid resistance. Good abrasion and heat resistance. Fair resistance to petroleum-based fluids.
Goralon/Polyester, 0.020	Black	Goralon / CSM (Chlorosulfonated Polyethylene)	Polyester	0.020	Resistance to: many chemicals (wider range versus chloroprene). Excellent ozone and weathering resistance. Good abrasion and heat resistance. Fair resistance to petroleum-based fluids.
Nitrile/Nylon, 0.018	Black	Buna-N (Nitrile)	Nylon	0.018	Excellent resistant to petroleum-based fluids/mineral oils. General resistance to: many hydrocarbons, fats, oils, greases, hydraulic fluids, some chemicals. Attacked by: ozone, ketones, esters, aldehydes, chlorinated and nitro hydrocarbons.
Nitrile/Nylon, 0.018, FG	Off white	Buna-N (Nitrile)	Nylon	0.018	FDA material. Excellent resistant to petroleum-based fluids/mineral oils. General resistance to: many hydrocarbons, fats, oils, greases, hydraulic fluids, some chemicals. Attacked by: ozone, ketones, esters, aldehydes, chlorinated and nitro hydrocarbons.
Nitrile/Nylon, 0.033	Black	Buna-N (Nitrile)	Nylon	0.033	Excellent resistant to petroleum-based fluids/mineral oils. General resistance to: many hydrocarbons, fats, oils, greases, hydraulic fluids, some chemicals. Attacked by: ozone, ketones, esters, aldehydes, chlorinated and nitro hydrocarbons.
PTFE/Fiberglass, 0.010	Beige	PTFE	Fiberglass	0.010	Used for high temperature applications (to 500 F); chemical resistance. Non-stick surface. Example use: paint splatter
PVC/Polyester, 0.018, FR	Tan	PVC	Polyester	0.018	Military applications; mildew resistance; FR-rated; Self-extinguishing. Not suitable for oil-based coolants (water-based synthetic OK). For abrasion resistance, thicker material preferred.
PVC/Polyester, 0.021	Black	PVC	Polyester	0.021	Lower cost material for standard applications. Self-extinguishing. Not suitable for oil-based coolants (water-based synthetic OK).
PVC/Polyester, 0.021, Yellow	Yellow	PVC	Polyester	0.021	Lower cost material for standard applications. Self-extinguishing. Not suitable for oil-based coolants (water-based synthetic OK).
PVC/Polyester, 0.021,FR	Black	PVC	Polyester	0.018	Lower cost material for standard applications. Military applications; mildew resistance. Self-extinguishing. Not suitable for oil-based coolants (water-based synthetic OK). For abrasion resistance, thicker material preferred.
Silicone/Fiberglass, 0.032	Orange	PVC	Fiberglass	0.032	High ambient temperature up to 450 F. Chemical and moisture resistance. Weld spatter/spark resistance. Fair abrasion resistance; medium-duty chips. Limited resistance to petroleum-based fluids.

Zipper Choices

Tie Strips

Internal Guides

Internal Guides (Round Profile Bellows)

An internal guide is a structural component installed inside a bellows to prevent the bellows from resting on the covered part. It consists of an inner hub, which interfaces with the moving component being protected (such as a screw, shaft, or spline), and a guide plate, which supports and guides the inside diameter of the bellows.

Internal guides are inserted inside the bellows and ride along the covered component to maintain alignment during extension and compression. As the bellows expands and compresses, the internal guide helps control motion, prevent snaking or twisting, and ensure consistent tracking over long travel lengths.

Internal guides are necessary when the bellows is protecting a moving mechanical component such as a ball screw, acme screw, spline, or rotating shaft. Guide selection depends on orientation, travel length, speed, and the component being protected.

Types of Guides

Plastic (HDPE) (guide plate & hub)
Aluminum (guide plate & hub)
Nylon (hub) & Aluminum (guide plate)
Pin Type (Acetal pin/hub & PVC guide plate)

Note: Each guide requires a minimum overall clearance of 0.75” – 1” depending on the type used. This is calculated by the configuration tool.

Recommended Guide Types by Application

Application/Component	Recommended Guide Type
High-speed applications	Nylon guides
High temperature applications	Aluminum
Ball screws	Aluminum, plastic, nylon or pin-type guides
Share edged acme screws	Nylon or plastic guides
Acme screws	Nylon guides
Splines & keyed shafts	Nylon guides

Internal Guide (Photos)

Common Sizes & Legacy Part Numbers

Here are the legacy part numbers representing common rod boot sizes of Gortite® Sewn Bellows made from neoprene-coated nylon fabric.

ROD BOOT STYLE	Inside Diameter (ID)	Outside Diameter (OD)	Retracted Length every 12″ section	Available Inner Diameter (I.D.) Sizes
SRA-15	3/4″	3″	3/4″	1/2″ to 3″
SRB-15	1-1/8″	3-3/8″	3/4″	1/2″ to 3-3/8″
SRC-15	1-1/2″	3-3/4″	3/4″	1/2″ to 3-3/4″
SRD-15	1-7/8″	4-1/8″	3/4″	1/2″ to 4-1/8″
SRE-15	2-3/8″	4-5/8″	3/4″	1/2″ to 4-5/8″
SRF-15	2-7/8″	5-1/8″	3/4″	1/2″ to 5-1/8″
SRG-25	3-3/8″	7″	1/2″	1/2″ to 7″
SRH-25	3-7/8″	7-1/2″	1/2″	1/2″ to 7-1/2″
SRJ-25	4-1/2″	8-1/4″	1/2″	1/2″ to 8-1/4″
SRK-25	5″	8-3/8″	1/2″	1/2″ to 8-3/8″
SRM-25	5-3/8″	9-1/2″	1/2″	1/2″ to 9-1/2″
SRO-25	7-1/4″	11″	1/2″	1/2″ to 11″

Mounting Accessories: Clamps (for end collars) or Back-up mounting plates (for flange ends) can be added to your order upon request

Assorted metal hose clamps and flat washers on a gradient background, showcasing the precision of industrial bellows craftsmanship.

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Sewn Bellows