Help with Caps, Grips, and Closures specifications:
Shape or Application
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| Shape or Application | Caps come in a variety of different cross sections. The most common sections are described below. | ||
| Your choices are... | |||
| Round | These caps and plugs have a round cross section. | ||
| Square | These caps and plugs have a square cross section. | ||
| Rectangular | These caps and plugs have a rectangular cross section. | ||
| Round Handle or Hand Grip (Cap Style Only) | These caps are used as handles or grips. They may have finger nubs for easier gripping. | ||
| Flat Handle or Hand Grip (Cap Style Only) | These caps are used as handles or grips. They may have finger nubs for easier gripping. Flat grips have a square or rectangular cross section. | ||
| Hex Cap | These caps are for use with hex stock or nuts. | ||
| "U" Shape Cap | These caps have a U-shaped cross section and are made to protect a U-shaped channel or metal frame. | ||
| "I" Shape Cap | These caps have an I-shaped cross section and are made to protect an I-shaped metal frame. | ||
| 90° Angle Cap | These caps are designed to cap angle iron. | ||
| Screw Cap | These caps are specifically designed for covering a screw. They usually come as a two-piece assembly. | ||
| Washer Cap | A washer-style cap has a hole in the center and is used between a tube or hose and an end fitting. | ||
| Other | Unlisted, specialized, or proprietary configuration. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Threaded? | These caps or plugs are threaded. These caps have a female thread. The thread can be straight or tapered (NPT). Caps have a female thread and plugs have a male thread. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Tapered? | These caps and plugs have tapered sides, providing a snug fit. Some can be used as either a cap or a plug. Tapered caps and plugs are versatile and can be used for straight tubes and bars, male and female NPT threads, and male straight threads. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Anti-roll Cap? | Anti-roll caps are round caps with a square end to prevent tube or shaft from rolling. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Round Cap Specifications
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| Fits NPT Size: | This option applies to round caps only where the object to be capped has a male NPT (National Pipe Thread) thread. | ||
| Your choices are... | |||
| 1/8 NPT | |||
| 1/4 NPT | |||
| 3/8 NPT | |||
| 1/2 NPT | |||
| 3/4 NPT | |||
| 1 NPT | |||
| 1 1/4 NPT | |||
| 1 1/2 NPT | |||
| 2 NPT | |||
| 2 1/2 NPT | |||
| 3 NPT | |||
| 3 1/2 NPT | |||
| 4 NPT | |||
| 5 NPT | |||
| 6 NPT | |||
| Other | Unlisted NPT size. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Fits BSP Size: | This option applies to round caps only where the object to be capped has a male BSP (British Standard Pipe) thread. | ||
| Your choices are... | |||
| 1/4 BSP | |||
| 1/2 BSP | |||
| 3/8 BSP | |||
| Other | Unlisted BSP size. | ||
| Search Logic: | Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Fits Diameter: | This dimension applies to round caps and plugs only. For straight threads enter the major thread diameter (for example: enter .25 for a ¼ straight thread). Do not use where cap/plug or object being capped/plugged has a tapered (NPT or BSP) thread. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Round Cap Features: | |||
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| Flange | These caps and plugs offer a flange for easy removal or additional protection of bearing surfaces. They also prevent accidentally pushing the plug all of the way through the opening. | ||
| Knurled or Faceted Head | Usually found on threaded caps and plugs only, knurls or facets allow easier installation and removal, either by finger or wrench. | ||
| Slotted Head | Slotted caps and plugs can be installed or removed with a screwdriver. | ||
| Retaining Ring | The retaining ring fits over the object to be capped and functions to keep the cap in place during servicing. | ||
| Tear-tab | These caps have a tear-tab or strip for easy removal. When the tab is pulled the cap tears away. Once removed they cannot be reused. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Square or Rectangular Cap Dimensions
These dimensions apply to square or rectangular caps only.
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| Width: | The width is the smaller cross sectional dimension for rectangular caps or plugs. If the section is a square, the width and length are the same dimension. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Length: | The length is the larger cross sectional dimension for rectangular caps or plugs. If the section is a square, the width and length are the same dimension. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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Material
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| Material | |||
| Your choices are... | |||
| Aluminum | A bluish silver-white malleable ductile light trivalent metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation. | ||
| Delrin® | Delrin® refers to a class of acetal homopolymers from DuPont. They offer high tensile strength, impact resistance and stiffness, and outstanding fatigue endurance. They are resistant to moisture, gasoline, solvents, and many other neutral chemicals. They offer dimensional stability and good electrical insulating characteristics. Delrin is resilient and resists creep. It is also maintains natural lubricity at a wide end-use temperature range. The main property limitations are repeated use in steam or hot water, and exposure to strong acids or bases outside the pH range of 4-9. | ||
| EVA | Ethyl vinyl acetate (EVA) is a transparent thermoplastic elastomer. It remains flexible at low temperatures and resists cracking. Brand names include: Ultrathene® (Quantum), Elvax® (DuPont), Evalca® (Eval). | ||
| Monel® | Monel® alloy has high strength and resistance to a range of corrosive media including seawater, hydrofluoric and sulfuric acids, and alkalis. | ||
| Nylon / Polyamide | Nylon, comprising several grades of polyamides, is a general purpose material in wide use; it is tough and resistant and has good pressure ratings. | ||
| Paper | Paper caps are frequently used for high-temperature applications that may degrade plastic caps or plugs. | ||
| Polyetheretherketone (PEEK) | PEEK is a high temperature resistant engineered thermoplastic. It has excellent chemical and fatigue resistance, and thermal stability. PEEK has superior chemical resistance, is inert to all common solvents and resists a wide range of organic and inorganic liquids. PEEK has a maximum continuous working temperature of 480°F and retains its mechanical properties up to 570°F in steam or high-pressure applications. | ||
| Polyethylene (PE) | A semi-crystalline (typically around 50%), whitish, semi-opaque commodity thermoplastic that is soft, flexible and tough - even at low temperatures - with outstanding electrical properties but poor temperature resistance. It also has very good chemical resistance but is prone to environmental stress cracking; it has poor UV resistance (unless modified) and poor barrier properties, except to water. | ||
| Polypropylene (PP) | Polypropylene is a thermoplastic material exhibiting excellent cold flow, bi-axial strength, and yield elongation properties. It is similar to PVC but can be used in exposed applications because of its resistance to UV, weathering, and ozone. | ||
| Rubber - Silicone | Silicones are polymers in which organics groups, such as methyl and phenyl groups are bonded to the silicone atoms in chains of inorganic siloxanes (-Si-O-Si-). Their properties include heat, cold and weather resistance, electrical insulation, release, water repellency and defoaming. | ||
| Rubber - Styrene Butadiene (SBR) | Good resistance to petroleum hydrocarbons and fuels. Widely used with most oils, hydraulic fluids, alcohol. Many compound variations are available for specific applications. Suggested operating temperature (-30° to 275° F) | ||
| Steel - Stainless | Stainless steel is chemical and corrosion resistant and can have relatively high pressure ratings. | ||
| Vinyl | Vinyl exhibits good flexibility and chemical resistance; it is used in many medical and chemical applications. | ||
| Other | Unlisted, specialized, or proprietary material. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Additional Features
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| Hanger Tip? | A hanger tip allow for the hanging of tools or other items. Hanger tips are sometimes integrated with handles or grips. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Cap has Lift / Pull Tab or Ring or is a Pull Plug? | Cap has a tab or ring for easy removal or plug is of pull plug construction. Pull plugs are designed for "through-hole" applications. They use a smaller diameter "pull section" to pull the plug until it is snug in the hole. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Vented? | Plug or cap is vented. Vented caps are commonly used in the medial industry. The vent allows air flow during gas sterilization and prevents the cap from blowing off during extreme heat conditions. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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