ASME B18.10 pdf download Track Bolts and Nuts
Types of track bolts are designated as “oval neck” and”elliptic neck.”
2.3 Body Diameters
This Standard provides for two styles of body diame-ters. Bolts shall be provided with a full size body inaccordance with the respective table dimensions of Table1 or 2 for body diameter,E, unless a reduced bodydiameter is specified on the purchase order. These shailhave a body diameter not less than the minimum pitchdiameter of the thread and not exceeding the minimumbody diameter,E,shown in Table 1 or 2.
The bolt length shall be the distance measured parallelto the axis of the product from the bearing surface ofthe head to the extreme end of the bolt,including thepoint if the product is pointed.
Bolt threads shall be rolled unless otherwise agreedto between the purchaser and the supplier.
Threads shall be Unified lnch Series,Class 2A as speci-fied in respective dimensional tables in ASME B1.1.
2.5.1 Thread Acceptance Gaging. Unless otherwisespecified, dimensional acceptability of screw threadsshall be determined based on System 21,ASME B1.3M.2.6 Thread Length
The length of thread shall be measured parallel to theaxis of the bolt from the end of the bolt to the lastcomplete (fully formed) thread. The minimum threadlength,LT. shall be as shown in Tables 1 and 2.Thetolerance on thread length shall be + 0.187 in. or 2.5 ×pitch, whichever is greater. Bolts of nominal lengths tooshort to accommodate the minimum thread lengths shallbe threaded full length. The distance from the neck tothe first complete (full form) thread shall not exceed 215threads for sizes up to and including 1 in. and 31% threadsfor sizes over 1 in.
2.7 Pointed Products
Unless otherwise specified, bolts need not be pointed.When pointed, the first full formed thread at a majordiameter is located at a distance no greater than 2 timesthe pitch measured from the end of the screw. This dis-tance is to be determined by measuring how far thepoint enters into a cylindrical NOT GO major diameterring gage.
Shanks of bolts shall be straight within the followinglimits at Maximum Material Condition (MMC). For boltswith nominal lengths up to and including 12 in., the
maximum camber shall be 0.006 in. per inch (O.006L) ofbolt length. For bolts having a fuli diameter body,aty pical gage and gaging procedure for checking boltstraightness is given in Appendix I of ASME B18.2.1.For bolts with an undersized body, the gaging methodshall be the sleeve gage shown in Appendix ll of ASMEB18.2.1.
2.9 Track Bolt Nuts
Track bolt nuts shall be dimensionally in accordancewith ASME B18.2.2.Selected sizes are included inTable 3.
Unless otherwise specified, bolts and nuts shall besupplied with a plain (as processed) finish, unplated oruncoated.
Bolts and nuts shall be visually,without magnifica-tion, free from burrs, seams, laps, loose scales, irregularsurfaces, and any defects affecting their serviceability.When control of surface discontinuities for bolts isrequired, the purchaser shall specify conformance toASTM F 788/F 788M.
When control of surface discontinuities for nuts isrequired,the purchaser shall specify conformance toASTM F 812/F 812M.
Bolts and nuts shall be designated by data in thefollowing sequences as shown:
a) product name
b)nominal size (fractional or decimal equivalent)(c) threads per inch
(dproduct length (fractional or two-place decimalequivalent)
(e) material,including specification where necessarylf) protective finish if required
See the following examples:EXAMPLES:
(yOval neck track bolt,ASME B18.10,7%-9 × 2’% , steel, ASTMA 449,lype 3, plain finish
(2yHeavy square nut.ASME B18.10.7系- 9，steel,，ASTM A 563,Grade DH, plain finish
2.13 ldentification Symbols
2.13.1 Grade Symbols.Each track bolt and tracknut shall be marked in accordance with its material,mechanical, or performance requirements.
2.13.2Source Symbols.All track bolts and tracknuts shall be marked to identify the manufacturingsource using a mark registered with U.S. Patent andTrademark Office in accordance with the Fastener Qual-ity Act.