Hex Bolts

Hex Bolts
Grade A – Intended for Hex Head Bolts and Hex Boltsstuds/threaded rod having a minimum tensile strength of 60 ksi in general applications.

Grade B – Intended for Heavy Hex Head, these bolts, studs/threaded rod having a tensile strength of 60 to 100 ksi and intended for flanged joins in piping systems with cast iron flanges.

Grade Chas been replaced by F1554 Spec for Anchor Bolts, Steel, 36, 55 and 105-ksi Yield

Domestic and Imported

1/2″ up to 4″ Diameter

Standard Thread Length Formulas
Bolt lengths ≤ 6″: Thread length = (2 X diameter) + 1/4″
Bolt lengths > 6″: Thread length = (2 X diameter) + 1/2″

Table 2: Hex Bolt Dimensions

Bolt DiaBody DiaWidth Across Flats (F)Width Across Corners (C)Height (H)
MaxMinBasicMaxMinMaxMinBasicMaxMin
3/80.3880.3609/160.5620.5440.6500.6201/40.2680.226
1/20.5150.4823/40.7500.7250.8660.82611/320.3640.302
5/80.6420.60515/160.9380.9061.0831.03327/640.4440.378
3/40.7680.7291-1/81.1251.0881.2991.2401/20.5240.455
7/80.8950.8521-5/161.3121.2691.5161.44737/640.6040.531
11.0220.9761-1/21.5001.4501.7321.65343/640.7000.591
1-1/81.1491.0981-11/161.6881.6311.9491.8593/40.7800.658
1-1/41.2771.2231-7/81.8751.8122.1652.06627/320.8760.749
1-3/81.4041.3452-1/162.0621.9942.3822.27329/320.9400.810
1-1/21.5311.4702-1/42.2502.1752.5982.48011.0360.902
1-3/41.7851.7162-5/82.6252.5383.0312.8931-5/321.1961.054
22.0391.96433.0002.9003.4643.3061-11/321.3881.175
2-1/42.3052.2143-3/83.3753.2623.8973.7191-1/21.5481.327
2-1/22.5592.4613-3/43.7503.6254.3304.1331-21/321.7081.479
Source: ASME B18.2.1 1996

Table 10 Hex Head Bolt Length Ranges

Bolt DiameterLength up to 1" (incl)over 1" to 2-1/2 (incl)2-1/2" to 4" (incl)4" to 6" (incl)Over 6"
Source: ASME B18.2.1 2003 E-15
1/2" +0.02 to -0.03 +0.04 to -0.06 +0.06 to -0.08 +0.08 to -0.10 +0.12 to -0.18
5/8" +0.02 to -0.03 +0.06 to -0.08 +0.08 to -0.10 +0.10 to -0.10 +0.12 to -0.18
3/4" +0.02 to -0.03 +0.06 to -0.08 +0.08 to -0.10 +0.10 to -0.10 +0.14 to -0.18
7/8" - +0.08 to -0.10 +0.10 to -0.14 +0.12 to -0.16 +0.16 to -0.20
1" - +0.08 to -0.10 +0.10 to -0.14 +0.12 to -0.16 +0.16 to -0.20
1-1/8" - +0.12 to -0.12 +0.16 to -0.16 +0.18 to -0.18 +0.22 to -0.22
1-1/4" - +0.12 to -0.12 +0.16 to -0.16 +0.18 to -0.18 +0.22 to -0.22
1-3/8" - +0.12 to -0.12 +0.16 to -0.16 +0.18 to -0.18 +0.22 to -0.22
1-1/2"- +0.12 to -0.12 +0.16 to -0.16 +0.18 to -0.18 +0.22 to -0.22
1-1/2" & over - +0.18 to -0.18 +0.20 to -0.20 +0.22 to -0.22 +0.24 to -0.24

Other Bolts Available:

  1. TEE Head Bolts
  2. Dome Head Bolts
  3. Stainless Steel
  4. Brass
  5. Aluminum
  6. Special Alloys
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