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Fasteners And Fittings > HVAC > Flashcards

HVAC Flashcards

1
Q

Major diameter of a fastener

A

Largest diameter of a screw head

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2
Q

Minor diameter of a screw head

A

Smallest diameter of a screw head

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3
Q

Root diameter of a fastener

A

Diameter of a screw head measured from the inner edge of the thread

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4
Q

Screw thread

A

A flexible form that has been wrapped around cylinder at a uniform rate of advance

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5
Q

External thread

A

Thread on the outside of a member

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6
Q

Internal thread

A

Thread on the inside of a member

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7
Q

Nominal diameter

A

Diameter by which the fastener is named

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8
Q

Pitch diameter (simple effective diameter)

A

Diameter to where the thread thickness is equal to the space between the threads

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9
Q

Pitch

A

Distance from a point on a screw thread to a corresponding point on the next thread measured parallel to the axis

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10
Q

Lead

A

The distance a thread advances actually in one turn

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11
Q

Crest

A

The flat or straight edge of the top of a single thread

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12
Q

Root

A

The bottom surface between two threads

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13
Q

Flank or side

A

The surface of the thread from the root to the crest

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14
Q

Single depth of a thread

A

The distance from the root to the crest measured on a perpendicular axis

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15
Q

Thickness of the thread

A

The distance between the two adjacent sides of a single thread measured from the pitch line

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16
Q

Fit

A

The looseness or tightness between two mating threads

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17
Q

Tolerance

A

Total permissible variation. Maximum or minimum sizes of the parts

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18
Q

Allowance

A

Internationally agreed difference in the dimensions of mating parts

19
Q

Thread angle

A

Angle formed by the sides or flanks of a screw head most are 60degrees

20
Q

Helix angle

A

Angle formed by the helix of a thread

21
Q

Left hand thread

A

Winds in a counter clockwise direction

22
Q

Right hand thread

A

Clockwise

23
Q

UNF

A

Unified national fine. Used for materials of high tensile strength. 60 degrees

24
Q

UNC

A

Unified national coarse. Low tensile strength. Deep grooves with greater distance between the crests. 60 degrees

25
Q

NPT

A

Tapered thread that seals the joint

26
Q

Type K

A

Colour coated green, thickest wall. Available in both hard and soft temper. For underground and interior service.

27
Q

Type L

A

Colour coated blue. Thinner walls than K but thicker walls than L. Available in both soft and hard temper and applicable for above ground service

28
Q

Type M

A

Colour coated Red. Thinner than both K and L. Available in hard temper only suited for above ground service and water lines.

29
Q

DMV

A

Colour coated yellow. Suitable for only above ground drains waste and vent piping. Cannot carry any water pressure

30
Q

How is pipe measured?

A

By it’s inside diameter

31
Q

How is tube measured

A

By it’s inside diameter

32
Q

SAE flared tube fittings

A

Nut is threaded internally and the body is threaded externally. The body is tapered and designed to fit against the flared tube. The angle of the taper is 45 degrees.

33
Q

Inverted flared tub fittings

A

The nut has an external thread and the body has a internal thread. Meant to be used with SAE

34
Q

JIC flared tubings

A

Joint industry conference. Similar to the SAE but has a 37 degrees flare. Used for hydraulic fittings and steel tubing. Reduced angle reduces the chance for a split flare

35
Q

Double compression fitting

A

Has two parts: nut and the body. Body has tapered internal thread and is designed to fit over the end of tubing

36
Q

Solderless compression fittings

A

Consists of three parts: body nut and sleeve.

37
Q

Bushing Vs coupling

A

Bushing goes into the fitting coupling goes over each of the tubing

38
Q

How big of a hole do you need to drill before you use a stud extractor

A

1/8”

39
Q

Soft solder

A

Lead and Tin, alloys that have a melting temp below 800 degrees

40
Q

Hard solder

A

Silver soldering. Brazing, higher temp for joining. Uses silver 1100 to 1600 degrees.

41
Q

Sil-Fos

A

15% silver 80% copper 5% phosphorus flows freely at 1300degrees

42
Q

95-5

A

95%tin 5%antimony melts at 464degrees

43
Q

What is a flux

A

A liquid solid or gaseous material that helps capillary action and prevents oxides.

Fasteners And Fittings (1 decks)

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