ASME B18.5 Step Bolt



Dimensions of Step Bolts (Inch) 
Nominal Size
or Basic Bolt
Diameter
[Note (1)] 
Body Diameter, E 
Head Diameter, A 
Head Height, H
Square Width,O
Square Depth,P
Maximum Corner
Radius on
Square,Q 
Maximum Fillet
Radius, R
[Note (2)] 
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
No.10 
0.19
0.199
0.182
0.656
0.625
0.114
0.094
0.199
0.185
0.125
0.094
0.031
0.031
1/4 
0.25
0.26
0.237
0.844
0.813
0.145
0.125
0.26
0.245
0.156
0.125
0.031
0.031
5/16 
0.313
0.324
0.298
1.031
1
0.176
0.156
0.324
0.307
0.187
0.156
0.031
0.031
3/8 
0.375
0.388
0.36
1.219
1.188
0.208
0.188
0.388
0.368
0.219
0.188
0.047
0.031
7/16 
0.438
0.452
0.421
1.406
1.375
0.239
0.219
0.452
0.431
0.25
0.219
0.047
0.031
1/2 
0.5
0.515
0.483
1.594
1.563
0.27
0.25
0.515
0.492
0.281
0.25
0.047
0.031

GENERAL NOTE: For additional requirements, refer to section 2, General Data.
NOTES:
(1) Where specifying nominal size in decimals, zeros preceding decimal and in the four th decimal place shall be omitted.
(2) The minimum radius is one half of the value shown.

Tags: ASME B18.5 Step Bolts

General Material:Stainless Steel,Nickel Alloy,Silicon Bronze,Aluminium Bronze,Brass,Naval Brass,Coppe,Copper-Nickel,Aluminum Alloy,Titanium,Alloy Steel,Such as C1008,C1018,C1022,C1035,C1045,40cr,SCM435,35crmoA,42crmoA,AISI4140SS304/A2-70,SS316/A4-80,SS310s,SS309,SS321,SS410,SS317,SS904L,17-4 PH/630,Duplex 2205,Duplex 31803,Nitronic 40,Nitronic 50,Nitronic 60,Nickel Alloy,Hastelloy C276,Inconel 600,Inconel 601,Inconel 625,Inconel 718,Inconel X750,Inconel 800H,Inconel 825,Monel 400,Monel 405,Monel K-500,MP35N,Nickel 200,Nickel 201,Waspaloy)C65500,C64200,C61400,C63000,C63200,C46200,H59,H62,H67,C46400,C11000,90/10 C70600,70/30 C71500,6061-T6,2024-T4,Ti-6Al-4V Grade 5,ASTM B348 Grade 2,ASTM B348 Grade 7,651/S63198
General Surface Finish:Blackoxide,Zinc,Dacromet 500/Dacromet 320,Non-electrolytically Deposited Zinc Flake,Hot-dip Galvanization,Phosphating,Passviation