• Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Head to rib tolerance on the No. 10 through 1/2" sizes for nominal lengths 7/8 in. and shorter shall be +0.031 and -0.000.
  • The minimum radius is one half of the value shown.
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Unit of Measure
Items
Round Head Ribbed Neck Bolts

Round Head Ribbed Neck Bolt, with 0.199" Body Dia.
Round Head Ribbed Neck Bolts

Round Head Ribbed Neck Bolt, with 0.260" Body Dia.
Round Head Ribbed Neck Bolts

Round Head Ribbed Neck Bolt, with 0.324" Body Dia.
Round Head Ribbed Neck Bolts

Round Head Ribbed Neck Bolt, with 0.388" Body Dia.
Round Head Ribbed Neck Bolts

Round Head Ribbed Neck Bolt, with 0.452" Body Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Round Head Bolts
Codes and Standards N/A ASME B18.5 1990 (R1998)
Unit of Measure N/A English
Nominal Size or Basic Bolt Dia. N/A No. 10 N/A 1/4 in N/A 5/16 in N/A 3/8 in N/A 7/16 in
Nominal Size or Basic Bolt Dia. (Decimal) N/A 0.1900 in N/A 0.2500 in N/A 0.3125 in N/A 0.3750 in N/A 0.4375 in
Max. Body Dia. (E) N/A 0.199 in N/A 0.260 in N/A 0.324 in N/A 0.388 in N/A 0.452 in
Min. Body Dia. (E) N/A 0.182 in N/A 0.237 in N/A 0.298 in N/A 0.360 in N/A 0.421 in
Max. Head Dia. (A) N/A 0.469 in N/A 0.594 in N/A 0.719 in N/A 0.844 in N/A 0.969 in
Min. Head Dia. (A) N/A 0.438 in N/A 0.563 in N/A 0.688 in N/A 0.782 in N/A 0.907 in
Max. Head Height (H) N/A 0.114 in N/A 0.145 in N/A 0.176 in N/A 0.208 in N/A 0.239 in
Min. Head Height (H) N/A 0.094 in N/A 0.125 in N/A 0.156 in N/A 0.188 in N/A 0.219 in
Head to Ribs for Lengths of 7/8 and Shorter (M)1 N/A 0.031 in
Head to Ribs for Lengths of 1 in. and Longer (M)2 N/A 0.063 in
Approx. Number of Ribs (N) N/A 9 N/A 10 N/A 12 N/A 12 N/A 14
Min. Dia. Over Ribs (O) N/A 0.210 in N/A 0.274 in N/A 0.340 in N/A 0.405 in N/A 0.470 in
Depth Over Ribs for Lengths of 7/8 and Shorter (P)3 N/A 0.250 in
Depth Over Ribs for Lengths of 1 in. and Longer (P)4 N/A 0.407 in
Depth Over Ribs for Lengths of 1-1/4 and Longer (P)5 N/A 0.594 in
Max. Fillet Radius (R) N/A 0.031 in
  • 1 Tolerance ±0.031
  • 2 Tolerance ±0.031
  • 3 Tolerance ±0.031
  • 4 Tolerance ±0.031
  • 5 Tolerance ±0.031
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