Firestone EMDG198 manual Installation, Material, Standard Bolt Length, 16-24 UNF

END CLOSURE OPTIONS

THE FOUR TYPES OF BEAD RINGS

BUTTON HEAD STEEL		COUNTERSUNK STEEL		RIBBED NECK		SOCKET HEAD
BEAD RING		BEAD RING		ALUMINUM		ALUMINUM BEAD RING*
				BEAD RING
						Used on
						4.5 in.
						Bolt
						Circles
						Use M6
						Cap
						Screws,
						(Not
						Included)
	Bolt		Bolt		Bolt
Customer	Length	Customer	Length	Customer	Length	Customer
	Effective		Effective		Effective
Supplies Plate		Supplies Plate				Supplies Plate
				Supplies
	Length		Length		Length
				Plate		Optional Shorter Length
						Ribbed Neck Bolt
Standard Bolt Length (in.)		Standard Bolt Length (in.)		Standard Bolt Length (in.)
1 7/8		1 5/8		1 7/8
Standard Effective Length (in.)		Standard Effective Length (in.)		Standard Effective Length (in.)
1.28		1.22		1.28
Standard Order Number		Standard Order Number		Standard Order Number
(bolt only)		(bolt only)		(bolt only)
WC1-358-3607		WC1-358-3625		WC1-358-3620
Thread		Thread		Thread
5/16-24 UNF		5/16-24 UNF		3/8-24 UNF
Tightening Torque (ft.-lbs.)		Tightening Torque (ft.-lbs.)		Tightening Torque (ft.-lbs.)
17 to 22		17 to 22		28 to 32

BEAD RINGS CONTINUED

When using bead rings, THE CUSTOMER WILL NEED TO FABRICATE HIS OWN MOUNTING PLATES. Hot or cold rolled steel provides satisfactory mounting surfaces, with specific finishes of 32 micro-inches, if machined in a circular fashion, and 250 micro-inches when ground (side to side). The thickness of mounting plates depends upon the application. The plates must be strong enough and backed by structural members to prevent bowing (of the plates) when subjected to the forces or loads involved. The rubber bellows provides its own seal; therefore, ‘O’ rings or other sealants are not needed when installing the part.

INSTALLATION

Follow this technique for assembling a bead ring style bel- lows to the mounting plate:

a. Insert the bolts into the bead ring (the bead rings have been previously attached to the bellows at the factory). The bolts will be pulled into place by the action of tighten- ing the nuts.

b. Slip all of the bolts (which are protruding through the bead ring) into the mating holes of the mounting plate and attach the lockwashers and nuts. FINGER TIGHT- EN all nuts to produce a uniform gap between the bead ring and mounting plate all the way around.

c. At this point, make certain that the bellows bead is prop- erly seated under the bead ring.

PLEASE NOTE THAT UNIFORM SUCCESSIVE TIGHT- ENING OF THE NUTS IS IMPORTANT TO SEAT THE RUBBER BEAD PROPERLY TO THE MOUNTING PLATE FOR ITS FULL CIRCUMFERENCE.

Continue with the following sequence:

d. Tighten all nuts one turn each, moving around the circle until continuous contact is made between the bead ring and mounting plate.

e. Torque all nuts to the torque specifications shown on the page, going at least two complete turns around the bolt circle.

MATERIAL

Bead rings are supplied in either steel or aluminum. Steel bead rings can be of two different types. Both the bead ring material and type of ring are called out in the description section of the order block on each individual data page. Also, the bolt length (for the bolts supplied with that particu- lar order number) is given.

WHERE A BEAD PLATE PART IS SHOWN AND THE BEAD RING ATTACHMENT IS PREFERRED, PLEASE REFER TO THE SELECTION GUIDE ON PAGE 32 FOR BOLT CIRCLE DIAMETERS AND NUMBER OF BOLTS (EACH RING).

10 *Available only on style #16, #25, and #255-1.5