Equipment Manufacturers realize that money spent to protect the life of their products repays them many times in customer satisfaction and reduced service cost. That is why Hydro-Wype Scraper Rings are installed in thousands of military and industrial systems ranging from aircraft landing gear to precision scientific instruments. On this page you can access information about the Hydro-Wype Scraper Ring, including a Product Overview, Specifications, Installation instructions, Life-span information and ordering details. You can also request a quotation and provide feedback.

Manufactured by Gad-Jets, Inc., Hydro-Wype Scraper Rings ensure the maximum removal of dirt, sand, dust, ice, snow, tree-sap and other abrasive materials from a piston rod as it moves in and out of a hydraulic or pneumatic cylinder. Designed with a metal-to-metal fit and controlled breakout friction, Hydro-Wype Scraper Rings prevent foreign matter from cutting seals/packing, scoring rods and bearings and from the loss of hydraulic fluids and pressure. Installers have reported that Hydro-Wype Scraper Rings have saved them tens and even hundreds of thousands of dollars on one installation in less than a year's time. By keeping dirt out of your hydraulic, pneumatic and other mechanical equipment, Hydro-Wype Scraper rings improve the life of your equipment and the reliability of your business performance. Just a few of the many popular Hydro-Wype Scraper Ring applications include aircraft landing gear, shock absorbers, power steering cylinders, lifting equipment, foundry equipment, presses, machine tools, construction, agricultural and road-building machinery.

The unique combination of materials and design features in the Hydro-Wype scraper ring, ensure that the scraper ring is able to perform consistently throughout it's life, limiting the ingress of potential contaminants. The preferred brass material is sufficiently malleable so as to allow the scraper to conform entirely to the surface of the rod, while also providing an ideal combination of hardness and tensile strength which protect against the ingress of contaminants. The 5^o angle of the ID both produces a sharp cutting edge as well as inducing rotation of the ring, so continually moving the slot (scarf) and further reducing the likelihood of the ingress of contaminants.

A-Series Scraper Rings

Gad-Jets’ Hydro-Wype A-Series scraper rings—manufactured in the company’s Dayton, Ohio plant—are the standard-bearer for military specification hydraulic scraper rings. Gadjets Scrapers have been protecting rods and packing in the landing gear of military aircraft and in other government applications for six decades. The mil-spec A-Series Scraper Rings are available in several form-factors.

• One-piece Scraper Rings

  Designed primarily for OEM's and maintenance/repairers engaging in a full tear-down refurbishment, one-piece Scraper rings provide the optimal ratio of tension against the rod vs. break-out friction. This is achieved by the use of a unique coiled design that pretensions the ring so that it will hold it's wiping capability over a very large number of cycles. A patented spring is incorporated (in A20-A71) to allow the tension to be maintained throughout the life of the scraper ring.

   

• Two-piece Scraper Rings

  Gadjets introduced the two-piece rings for the A-series range specifically for maintenance-repair applications including live-replacement so a full tear-down or removal of the rod-end, clevis or linkage can be avoided. The two-piece ring is especially effective when combined with the Hydro-Wype Adapter or some similar means of fixing the ring in place outboard of the cylinder cap and existing packing. Thus, in retrofit situations, the adapter can simply be released from the end-cap, the spring and two halves of ring removed and replaced with a new kit. The two-piece ring takes advantage of a patented spring design, to retain the two halves of the ring after they have been fitted to the rod.

   

  • (Standard) Rod Scrapers

  Most usually, a Hydro-Wype scraper ring is intended to scrape the external surface (outside diameter) of a rod. Thus, the ring is constructed using a process that allows for the precision scraping edge to be cut into the inside diameter of the ring as the final step of manufacture, which is completed immediately prior to shipping.

   

  • Bore Scrapers

  Scrapers that are constructed to provide a precision scraping edge on the outside diameter of the ring are also available in the Hydro-Wype product family, for use in applications where a bore or cylinder interior needs to be maintained free of contaminants.

New AB-Series Scraper Rings

Gadjets Inc. has recently introduced the new AB-Series of premium metal scrapers designed specifically for commercial applications. Manufactured in brass, with a stainless steel spring, the AB range includes both the original one-piece, and newer two-piece metal ring designs. The primary difference between the new AB range and previous versions of the Hydro-Wype scraper, is that the AB series are unplated. Cadmium, or other mil-spec plating is often unnecessary in many commercial environments as brass and other available copper alloys provide sufficient corrosion resistance, the AB-series can be provided as a more economical and readily available alternative.

The Hydro-Wype™ scraper is a metal, spring-reinforced ring with a precision scraping edge used to clean and protect hydraulic rods and seals from contamination and damage. The uniquely coiled design and construction allows the ring to take advantage of the natural helix of any rod, to slightly rotate the ring during cycles. This continually presents a new part of the scraping surface to the rod, eliminating the potential for a wear-pattern. When installed on a hydraulic rod or shaft, the ring removes dirt, mud, ice and other foreign matter from the rod before such contaminants can reach the packing or bearings. The scraper ring has also proven to protect the rod or shaft from scoring and abrasion that cause damage to the seals/packing.

Customers of the Hydro-Wype scraper ring enjoy reduced unscheduled downtime, reduced preventative maintenance and reduced parts replacement and TDM costs.  The Hydro-Wype Scraper Ring is built to government specifications and is the standard by which other scraper rings in the industry are manufactured.  Constructed preferably of brass (other materials are available too), Hydro-Wype Scraper Rings may be coated with cadmium plating to meet these government standards.  

Hydro-Wype A-series Scraper Rings are equal to and interchangeable with part numbers MS28776M2. Dimensions are in inches unless otherwise specified. Tolerances are in fractions +/- 1/64, decimals +/- .005, angles +/- 1/2 degree.

Profile -and Cross Section - Style II A-Series Hydro-Wype

For most  applications, Free-Cutting Brass is considered a robust and economical choice. As the preferred brass material, free-cutting brass is sufficiently  malleable so as to allow the scraper to conform to the surface of the rod, while also providing an ideal combination of hardness and  tensile strength which protect against the ingress of contaminants. Free-cutting brass is the default material per the following specification:

Preferred Rod Stock: Copper Alloy No. C36000: (Free Cutting Brass)

Chemical Composition % by weight

Copper	Lead	Iron	Zinc
61.5 Nominal	2.5 Minimum	.35 Maximum	35.4 Nominal

Mechanical Properties

Typical  for 1" rod half hard temper (20%)

Hardness*	Rockwell B Scales	78
Tensile Strength**	KSI	58
Yield Strength**	KSI	45
Elongation**	% in 2 inch	25

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	67
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 572 F	.0000114
Density	lb/cu in @ 68 F	.307
Electrical Conductivity* (Annealed)	% IACS @ 68 F	26
Modulus of Elasticity	KSI	14,000