Chapter 11: Miscellaneous Types of fasteners

•Key is a piece of steel lying partly in a groove in the shaft and extending into another groove in the hub.•Keyseat is the groove in the shaft•Keyway is the groove in the hub or surrounding part

MISCELLANEOUS FASTENERS

TYPES OF KEYS

MISCELLANEOUS FASTENERS

TYPES OF KEYS

Dimensioning of Keyseats

• Width• Depth• Location• Length (if required)

MISCELLANEOUS FASTENERS

DIMENSIONING KEYSEATS

Splines & Serrations

• A splined shaft is a shaft having multiple grooves cut around its circumference for a portion of its length in order that a sliding engagement may be made with corresponding internal grooves of a mating part

SPLINES

MISCELLANEOUS FASTENERS

Pin fasteners: an inexpensive and effective method of assembly when loading is primarily in shear

• Semipermanent pin fasteners– Machine pins– Radial locking pins

–Quick-release pins• Push-pull pins• Positive locking pins: cotter pins, single acting pins,

double acting pins

Retaining rings or snap rings are used to provide a removable shoulder to accurately locate, retain or lock components on shafts and in bores of housings

• Stamped• Wire-formed• Spiral-wound

SpringsDimension: size, shape, material, diameter,

pitch, shape of ends, length• Controlled action• Variable action• Static• Types of springs– Compression– Extension– Torsion– Power

MISCELLANEOUS FASTENERS

SPRING NOMENCLATURE

TYPES OF SPRINGS

MISCELLANEOUS FASTENERS

RivetsBasically a rivet is a ductile metal pin that is inserted through holes in two or more parts and having the ends formed over to securely hold

the parts

• Large: structural work of buildings and bridges• Aerospace equipment• Small• Blind: blind riveting is a technique for setting a rivet without

access to the reverse side of the joint

LARGE RIVETS

MISCELLANEOUS FASTENERS

RIVETEDJOINTS

MISCELLANEOUS FASTENERS

MISCELLANEOUS FASTENERS

RIVETEDJOINTS

CONVENTIONAL RIVET SYMBOLS

MISCELLANEOUS FASTENERS

11.6 Welded Fasteners and 11.7 Adhesive Fasteners

• A resistance-welded fastener is an externally or internally threaded metal part designee to be fused permanently in place by standard welding equipment

• Stress on bonded joints– Tensile– Shear– Cleavage– peel

Stresses in bonded joints