007 - Rocafc Ch 6

Front 1

Threaded fastener

Back 1

Device such as a nut or bolt that joins or fastens parts together with threads

Front 2

What was the whitworth thread angle?

Back 2

55 degrees

Front 3

Sellars develpoed the american national thread which had a standard thread angle of what?

Back 3

60 degrees

Front 4

What is a screw thread series?

Back 4

A group of diameter-pitch combinations. The standard series is a screw thread series of coarse (UNC/UNRC), fine ( UNF/UNRF) and extra-fine(UNEF/UNREF) graded putches and eight series with constant piches.

Front 5

Pitch

Back 5

Distance between corresponding points on adjacent thread forms. Measure parallel to the axis.

Front 6

Graded pitch

Back 6

A standard screw thread series with a differnet number of threads per inch based on diameter

Front 7

Constant pitch

Back 7

A standard screw thead series with a set number of threads per inch regardless of diameter

Front 8

Tolerance

Back 8

The amount of variation allowed above or below a dimension

Front 9

Allowance

Back 9

The differnce between the design size and the basic size of a thread

Front 10

What are the classes of threads?

Back 10

1A, 1B, 2A, 2B, 3A and 3B. A designates external threads and B internal. The tolerance is tighter at 1 than 3.

Front 11

Nonthreaded fastener

Back 11

A device that joins or fastens parts together without threads. Most common example is a rivet.

Front 12

Types of bolts

Back 12

Square head, hex cap, round head, countersunk bolt, step bolt and round head square neck carriage bolt

Front 13

Type of bolt heads

Back 13

Hex washer, flat countersunk, oval countersunk, hex, round, truss, pan, fillister, button, square, round countersunk and headless

Front 14

Types of driving recesses for screws and bolts?

Back 14

Hex socket, phillips recess, drilled spanner, fluted socket, frearson recess, slotted spanner, slotted, clutch recess, one-way and pozidriv

Front 15

Head styles of rivets?

Back 15

Pan, button, flat countersunk, flat, belt, coopers, tinners, truss, high button, cone, boiler and globe

Front 16

Structural steel

Back 16

Steel used in the erection of structures

Front 17

Beam

Back 17

I shaped structural steel used to provide support over long expanses. Standard are S, wide-flange are W, misc shaped are M and bearing piles are HP

Front 18

Channel

Back 18

C shaped structural steel used in conjunction with other shapes as support members or combined to create and serve as an I beam

Front 19

Angle

Back 19

L shaped structural steel

Front 20

Tee

Back 20

T shaped structural member made by cut I beam, from mill specs or 2 angles combined

Front 21

Difference between tubing and pipe?

Back 21

Tubing is used for structural applications while pipe carries gasses or liquids.

Tubing is specs bynoutside dimensions and wall thickness while pipe is based on nominal sizes with variojs wall thicknesses typically called schedules.

Front 22

Difference between sheet and plate?

Back 22

Plate is generally 3/16" or thicker while sheet is 1/8" or less.

Front 23

Threaded fasteners are based upon an inclined ______________ wrapped around a cylinder.

Back 23

plane

Front 24

What is the distance between corresponding points on adjacent thread forms.

Back 24

pitch - it is always measured parallel to the axis

Front 25

Rivet ____________ is the effective holding length of a rivet.

Back 25

grip

Front 26

What is the distance from the edge of the plate to the center line of the nearest row of rivets?

Back 26

margin

Front 27

The size of a rivet required is determined by the _________ of the parts being joined.

Back 27

thickness - the length is truly the thickness of the parts plus enough material for the shank to be upset to the desired shape.

Front 28

Which dimension in an unequal leg angle iron is always given first?

Back 28

the longer leg