Gate Roller Links and Pins

Class 2, Grade B8 Nuts shall conform to ASTM A 194/A 194M, Grade 8A.

(1) Links - ASTM A 276, UNS S30400 or S41000, Condition A,

hot-finished or cold-finished, Class A.

(2) Pins - ASTM A 276, UNS S21800, Condition A, cold-finished or

hot-rolled and machine-finished to the tolerances specified in

ASTM A 484/A 484M for cold-finished round bars, Class C.

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NOTE: It is contemplated that the pin diameter and

tolerances shown will be the minimum size and

tolerances as given in ASTM A 484/A 484M for cold

finished round bars. Machined pins should have a

surface roughness of not exceeding 1.6 micrometers

(63 microinches). Minimum diameter of holes in bars

shall be the maximum pin size plus an allowance of

0.2 mm (0.008 inch) for a free fit. Minimum

diameter of holes in rollers should be the nominal

diameter of the pin plus 1 mm (1/32 inch). The

length of the pin between retainer ring grooves

should be based on the maximum width of the roller,

the maximum thickness of the hot-finished bars

rolled to the tolerances given in ASTM A 484/A 484M

plus a clearance of approximately 1 mm (0.040 inch)

to avoid binding between bars, or binding between

bars and rollers.

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d. Retaining rings for gate roller links shall be corrosion resistant

steel conforming to ASME B27.7, BASIC external series type with nominal

ring size of [_____] mm inches.

e. Seal Plates, Bars, and Retainers; Roller Guide Bars; and Track

Plates.

(1) Welded Seal Plates and Bars; Welded Roller Guide Bars; and

Welded Track Plates - ASTM A 240/A 240M, UNS [S40500] [S41008]

[S30400], Hot-Rolled and Annealed or Heat Treated, and Blast

Cleaned or Pickled Finish; or ASTM A 276, UNS S30400, S40500, or

S41000 with a maximum carbon content of 0.08 percent, Condition A,

Hot-Finished or Cold-Finished, Class C.

(2) Bolted Seal Plates, Bars, and Retainers; and Bolted Roller

Guide Bars - ASTM A 240/A 240M, UNS [S40500] or [S41008] [S30400],

Hot-Rolled and Annealed or Heat Treated, and Blast Cleaned or

Pickled finish; or ASTM A 276, UNS S30400, S40500, or S41000,

Condition A, hot-finished or cold-finished, Class C.

2.1.5.5

Pipe

ASTM A 312/A 312M, [seamless] [welded], UNS S30400, NPS and schedule number

or outside diameter and nominal wall thickness as shown, [plain] [threaded]

[threaded and coupled] ends.

SECTION 05502A

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