Straight Thread Types, Port Connections; Flange Connection Types; Tightening Methods - JLG 400S Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS

Straight Thread Types, Port Connections

ORB = o-ring boss per SAE J1926, ISO 11926

MPP = metric pipe parallel o-ring boss per SAE J2244, ISO

6149, DIN 3852

MFF = metric flat face port per ISO 9974-1

BSPP = British standard parallel pipe per ISO 1179-1, DIN 3852-

Figure 5-8. MFF-BSPP Thread

FL61 = code 61 flange per SAE J518, ISO 6162

FL62 = code 62 flange per SAE J518, ISO 6162

Figure 5-9. ORB-MPP Thread

Torque = Application of a twisting force to the applicable con-

nection by use of a precise measurement instrument (i.e.

torque wrench).

Finger Tight = The point where the connector will no longer

thread onto the mating part when tightened by hand or fin-

gers. Finger Tight is relative to user strength and will have

some variance. The average torque applied by this method is 3

ft. lbs. (4 Nm). Also referred to as 'Hand Tight. '

TFFT = Turns From Finger Tight; Application of a preload to a

connection by first tightening the connection by hand (fin-

gers) and applying an additional rotation counted by a

defined number of turns by use of a tool.

FFWR = Flats From Wrench Resistance; Application of a pre-

load to a connection by tightening to the point of initial

wrench resistance and turning the nut a described number of

'flats' . A 'flat' is one side of the hexagonal tube nut and equates

to 1/6 of a turn. Also referred to as the 'Flats Method. '