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HEAD STYLES Hex Cap Screw Bugle Hex cap screws feature a washer face on the Button Washer bearing surface, a chamfered point, and tighter body tolerances than hex bolts. Pan Binding Undercut Hex Bolt Similar to hex cap screw, hex bolts do not require a washer face or a pointed end and have a greater tolerance range in the body. Round Head Fillister Socket Head Cap Screw Socket heads feature an internal hexagonal drive DRIVES socket and close tolerances for precision assembly. Flat 82° Cross Recess Button Head Socket Cap Screw Type I FASTENER (Phillips) Button heads feature a dome shaped head, though Flat 100° this feature reduces the tensile capacity. Cross Recess Flat Head Socket Cap Screw Type IA Flat heads feature an 82° countersunk head for Flat Undercut (Pozidriv®) IDENTIFICATION flush connections. Like the button heads, this feature reduces the tensile capacity. Cross Recess Type II (Frearson) Low Head Socket Cap Screw Indented Hex Low heads are similar to standard socket heads, but with a shorter head for applications where clearance Cross Recess Square GUIDE is an issue. This head configuration also reduces the Combo strength capacity. Indented Hex Washer (Quadrex®) NUTS Carriage Bolt A round head bolt with a square neck under the Slotted head. These must be tightened with a nut. Serrated Hex Finished Hex Nuts: Hex Coupling Nuts: Washer Hexagonal shaped nuts with internal screw Designed to join two externally threaded Plow Bolt threads. Finished hex nuts are one of the most objects, usually threaded rod, together. Combination Similar to a carriage bolt, these have a flat head common nuts used. Phillips/Slotted to maintain a smooth surface. Typically used on Truss plows, road graders, and similar equipment. Hex Jam Nuts: Cap/Acorn Nuts: Low-Profile nuts that are normally half of the Used to cover exposed threaded stud, rod, and Dome Head Plow Bolt Round Washer Head, Hex/Slotted - Hex height of a standard nut. They are tightened bolt ends with a dome-like cap. This provides Similar to plow bolts, but with a domed head K-Lath or Modified Truss against the work surface and used in situations safety and a finished look to the exposed which takes the brunt of the wear when used in where a standard nut would not fit. threaded end. plow applications. Six Lobe Wafer (Torx®) Hex Machine Nuts: K-Lock Nuts: Elevator Bolt Machine screw nuts are commonly used with Commonly referred to as “Keps Nuts”, Elevator bolts feature a wide countersunk head machine screws and feature a flat top and these are used as a general purpose nut for with a shallow bearing surface and square neck. chamfered corners. They usually have a smaller Square moderate load assemblies. They consist of a Typically used in conveyor systems. Oval ® wrench size than a regular finished hex nut. nut assembled with a free spinning washer. The (Robertson ) teeth pattern of the washer bite into both the 12 Point Flange Screw Heavy Hex Nuts: nut and the base material to prevent loosening Also known as a ferry cap screw, the points on the Slightly larger and thicker than a standard hex caused by vibration. head make tightening easier on this high strength Round (U-Drive) Hex Socket Drive nut. Because of their secure hold and durability flange screw. they are usually used for large diameter and high strength bolt applications. Square Nuts: Square Nuts, or four sided nuts, are used most SOCKET SET SCREW POINTS Top Lock Nuts: often in channel applications. Square nuts offer Uniquely shaped threads provide a vibration a large surface, but do require more effort to General Point resistant friction fit, so the nut stays put. secure. These all metal locknuts withstand higher Appearance Type Description temperatures than nylon insert locknuts. Top thread section is deformed to create two or The most widely used style of set screw. It is designed for fast, permanent and semi-permanent location of parts on shafts Cup Point three locking zones; they start easily by hand, Self-Clinching Nuts: on up to 10 to 15 HRC points of the screw hardness, where high tightening torques are impractical. then must be wrenched into final position. Made of heat-treated steel, stainless steel, or Grade C is equivalent to Grade 8. aluminum and are designed to be installed into Half-Dog Intended for permanent settings. The point should fit closely to the diameter of the drilled hole or against the flat. Often replaces a pre-drilled or punched hole so the nut is flush on the back side. Generally installed in sheet Point dowel pins. Works well against hardened members or hollow tubing. Nylon Insert Locknuts (Nylocks): metal or other thin material that is too thin for A nylon insert locknut is most frequently used to tapping threads. It is the preferred style where frequent adjustments are required or where excessive indentation of the shaft is not desirable. Also resist unwanted loosening and vibration within Oval Point its application. used when seating against angular surface. Spring Nuts: Available in Flat, J, U and Rectangular styles, Designed for frequent resetting or relocating on hard steel shafts and where minimal damage to shafts is necessary. Sometimes these one-piece, self-locking nuts prevent Flat Point Nylon Insert Jam Locknuts: used as adjusting screw. A nylon insert jam locknut is very similar to the screws from loosening during vibration. These standard nylon insert locknut in the fact that nuts allow for fast, easy assembly and reduce the need for additional fasteners. Designed for quick and permanent location of gears, collars, pulleys or knobs on shafts. Counterclockwise locking knurls resist screw it is most frequently used to resist unwanted Knurled Point loosening and vibration within its application, loosening. Resists most severe vibration. but is shorter than a standard nylon insert locknut. Hex Panel (Pipe) Nuts: Panel nut is a general purpose nut used in A set screw with a sharp conical point used for permanent setting of a machine part on hardened or soft shafts. Cone Point tight areas where a thin nut is necessary. Zinc The deep penetration it offers give this style the highest torsional and axial holding power. Two Way Lock (Reverse Lock) Nuts: Uniquely plating, retards the corrosion rate in a normal shaped threads provide a vibration resistant atmosphere. Note friction fit keeping the nut in place. These all Alloy steel socket set screws are intended for compression applications only and are not normally subjected to embrittlement tests. Their use in tensile applications would require further consideration of the alloy used and the heat treatment. metal locknuts withstand higher temperatures than nylon insert locknuts. With Reversible lock Cage Nuts: nuts, the deformed threads are in the center of A square nut with a spring steel cage around the nut. Not reusable. it. Two wings on the spring steel cage can be THREAD FORMING FASTENERS - THREAD AND POINT STYLES compressed and released, allowing for easy Flange Top Lock Nuts: installation and minor alignment adjustments General Point Same as a top lock nut but with an enlarged during application. Appearance Type Description circular base that distributes heavy pressures equally in order to assure a secure hold. Often Tee Nuts: eliminates the need for an additional washer. Internally threaded fasteners used to fasten A Type A screws feature spaced threads with a gimlet point. They are typically used in thin sheet metals and wood. Large base requires a greater amount of torque wood, particle board, or plastic, leaving a flush to loosen and will cover an oversized or poorly surface. They have a long, thin body with a aligned hole. flange at one end that often have prongs or AB Type AB is similar to Type A, but with more threads per inch. This type of screw is recommended for sheet metals and wood. serrations. Type B screws feature the same threads per inch as the Type AB, but have a blunt point and incomplete starting threads. Serrated Flange Nuts: B Enlarged circular base distributes heavy They are intended for sheet metals and wood. pressures equally in order to assure a secure Wing Nuts: hold. Large base requires a greater amount of Permits frequent and rapid assembly and torque to loosen and will cover an oversized or disassembly without the need of a tool. The Self-piercing Self-piercing screws are used in thin sheet metals in order to avoid pre-drilling. poorly aligned hole. wings enable the nut to be turned by hand with just finger pressure. Available in Cold Forged, Wood screws feature single lead threads with sharp crests, and a gimlet point. The threads can be rolled or cut at the Stamped, and Nylon Insert Styles. Wood Screw Castle Nuts: manufacturer’s option. Great for both general purpose fastening and for locking. Just insert a cotter pin or safety Palnuts: 17 A self-drilling wood screw with a cutting slot in the screw tip. For use in wood when pre-drilling isn’t practical. wire through the slots and the drilled hole in the Featured with a large washer base that allows fastener. them to span a large or odd shaped hole. They Type F screws have machine screw diameter-pitch combinations approximating Unified Form. These have a blunt point and tapered are able to distort under load and return to F starting threads having multiple cutting edges and chip cavities. Slotted Nuts: their original shape because of their spring-like Opposing slots are cut into the end opposite the steel. When properly tightened, the steel can be flexible enough to provide a self-locking action. BT or Type 25 thread cutting screws have spaced threads with a blunt point and tapererd entering threads like Type B, but with bearing surface through the centers of the flats.

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