ASME B18.31.2 Tap End Full Body Studs
ASME B18.31.2 Tap-End Full Body Studs Standard provides dimensional
and general data for tap-end studs recognized as American National Standard in inch dimensions.
Double-end (tap-end type) stud: a stud designed to be installed in a tapped hole with
different threaded lengths on each end.
Full body studs have a shank diameter approximately equal to the nominal thread diameter along
the unthreaded portion of the stud.
For the tap end of the studs, both regular unified threads and interference-fit threads are
covered.
The inclusion of dimensional data in ASME B18.31.2 Standard is not intended to imply that
all products described are stock production items. Consumers should consult with suppliers
concerning availability of products.
ASME B18.31.2 Dimensions for Tap End Full Body Studs (mm)
| Nominal Size |
Diameter, D |
Tap-End Full Thread Length, BM |
Umax = 2P | Minimum Body Diameter, DS | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nominal | Min | Max | UNC and NC-5 Thread |
UNF Thread | 8UN Thread | UNC and NC-5 HF Threads |
UNF Threads |
8UN Threads |
||
| ¼ | 6.350 | 9.525 | 8.890 | 10.160 | 2.540 | 1.803 | … | 6.121 | 6.172 | … |
| 5/16 | 7.938 | 11.913 | 11.176 | 12.649 | 2.819 | 2.108 | … | 7.696 | 7.722 | … |
| 3/8 | 9.525 | 14.300 | 13.513 | 15.088 | 3.175 | 2.108 | … | 9.246 | 9.322 | … |
| 7/16 | 11.113 | 16.662 | 15.748 | 17.577 | 3.632 | 2.540 | … | 10.820 | 10.871 | … |
| ½ | 12.700 | 19.050 | 17.983 | 20.117 | 3.912 | 2.540 | … | 12.395 | 12.471 | … |
| 9/16 | 14.288 | 21.438 | 20.371 | 22.758 | 4.242 | 2.819 | … | 13.970 | 14.021 | … |
| 5/8 | 15.875 | 23.825 | 22.657 | 24.968 | 4.623 | 2.819 | … | 15.519 | 15.621 | … |
| ¾ | 19.050 | 28.575 | 27.305 | 29.845 | 5.080 | 3.175 | … | 18.669 | 18.771 | … |
| 7/8 | 22.225 | 33.350 | 31.953 | 34.747 | 5.639 | 3.632 | … | 21.819 | 21.920 | … |
| 1 | 25.400 | 38.100 | 36.525 | 39.675 | 6.350 | 4.242 | … | 24.968 | 25.070 | … |
| 1⅛ | 28.575 | 42.875 | 41.275 | 44.450 | 7.264 | 4.242 | 6.350 | 28.092 | 28.245 | 28.143 |
| 1¼ | 31.750 | 47.625 | 46.050 | 49.225 | 7.264 | 4.242 | 6.350 | 31.267 | 31.420 | 31.318 |
| 1⅜ | 34.925 | 52.400 | 50.800 | 53.975 | 8.458 | 4.242 | 6.350 | 34.392 | 34.595 | 34.493 |
| 1½ | 38.100 | 57.150 | 55.575 | 58.750 | 8.458 | 4.242 | 6.350 | 37.567 | 37.770 | 37.668 |
| 1⅝ | 41.275 | 61.925 | 60.325 | 63.500 | … | … | 6.350 | … | … | 40.843 |
| 1¾ | 44.450 | 66.675 | 65.100 | 68.275 | 10.160 | … | 6.350 | 43.866 | … | 44.018 |
| 1⅞ | 47.625 | 71.450 | 69.850 | 73.025 | … | … | 6.350 | … | … | 47.193 |
| 2 | 50.800 | 76.200 | 74.295 | 78.105 | 11.278 | … | 6.350 | 50.165 | … | 50.368 |
| 2¼ | 57.150 | 85.725 | 83.820 | 87.630 | 11.278 | … | 6.350 | 56.515 | … | 56.718 |
| 2½ | 63.500 | 95.250 | 93.345 | 97.155 | 12.700 | … | 6.350 | 62.814 | … | 63.068 |
| 2¾ | 69.850 | 104.775 | 102.870 | 106.680 | 12.700 | … | 6.350 | 69.164 | … | 69.418 |
| 3 | 76.200 | 114.300 | 112.395 | 116.205 | 12.700 | … | 6.350 | 75.514 | … | 75.743 |
| 3¼ | 82.550 | 123.825 | 121.285 | 126.365 | 12.700 | … | 6.350 | 81.864 | … | 82.093 |
| 3½ | 88.900 | 133.350 | 130.810 | 135.890 | 12.700 | … | 6.350 | 88.214 | … | 88.443 |
| 3¾ | 95.250 | 142.875 | 140.335 | 145.415 | 12.700 | … | 6.350 | 94.564 | … | 94.793 |
| 4 | 101.600 | 152.400 | 149.860 | 154.940 | 12.700 | … | 6.350 | 100.914 | … | 101.143 |
ASME B18.31.2 Tap End Full Body Studs Length Tolerances (mm)
| Range, LT | Tap-End Studs Tolerance |
|---|---|
| From 19.05 through 63.5 | ±0.762 |
| Over 63.5 through 101.6 | ±1.270 |
| Over 101.6 through 203.2 | ±2.032 |
| Over 203.2 through 406.4 | ±2.540 |
| Over 406.4 | ±3.048 |
ASME B18.31.2 Dimensions for Tap End Full Body Studs (Inch)
| Nominal Size |
Diameter, D |
Tap-End Full Thread Length, BM |
Umax = 2P | Minimum Body Diameter, DS | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nominal | Min | Max | UNC and NC-5 Thread |
UNF Thread | 8UN Thread | UNC and NC-5 HF Threads |
UNF Threads |
8UN Threads |
||
| ¼ | 0.2500 | 0.375 | 0.350 | 0.400 | 0.100 | 0.071 | … | 0.241 | 0.243 | … |
| 5/16 | 0.3125 | 0.469 | 0.440 | 0.498 | 0.111 | 0.083 | … | 0.303 | 0.304 | … |
| 3/8 | 0.3750 | 0.563 | 0.532 | 0.594 | 0.125 | 0.083 | … | 0.364 | 0.367 | … |
| 7/16 | 0.4375 | 0.656 | 0.620 | 0.692 | 0.143 | 0.100 | … | 0.426 | 0.428 | … |
| ½ | 0.5000 | 0.750 | 0.708 | 0.792 | 0.154 | 0.100 | … | 0.488 | 0.491 | … |
| 9/16 | 0.5625 | 0.844 | 0.802 | 0.896 | 0.167 | 0.111 | … | 0.550 | 0.552 | … |
| 5/8 | 0.6250 | 0.938 | 0.892 | 0.983 | 0.182 | 0.111 | … | 0.611 | 0.615 | … |
| ¾ | 0.7500 | 1.125 | 1.075 | 1.175 | 0.200 | 0.125 | … | 0.735 | 0.739 | … |
| 7/8 | 0.8750 | 1.313 | 1.258 | 1.368 | 0.222 | 0.143 | … | 0.859 | 0.863 | … |
| 1 | 1.0000 | 1.500 | 1.438 | 1.562 | 0.250 | 0.167 | … | 0.983 | 0.987 | … |
| 1⅛ | 1.1250 | 1.688 | 1.625 | 1.750 | 0.286 | 0.167 | 0.250 | 1.106 | 1.112 | 1.108 |
| 1¼ | 1.2500 | 1.875 | 1.813 | 1.938 | 0.286 | 0.167 | 0.250 | 1.231 | 1.237 | 1.233 |
| 1⅜ | 1.3750 | 2.063 | 2.000 | 2.125 | 0.333 | 0.167 | 0.250 | 1.354 | 1.362 | 1.358 |
| 1½ | 1.5000 | 2.250 | 2.188 | 2.313 | 0.333 | 0.167 | 0.250 | 1.479 | 1.487 | 1.483 |
| 1⅝ | 1.6250 | 2.438 | 2.375 | 2.500 | … | … | 0.250 | … | … | 1.608 |
| 1¾ | 1.7500 | 2.625 | 2.563 | 2.688 | 0.400 | … | 0.250 | 1.727 | … | 1.733 |
| 1⅞ | 1.8750 | 2.813 | 2.750 | 2.875 | … | … | 0.250 | … | … | 1.858 |
| 2 | 2.0000 | 3.000 | 2.925 | 3.075 | 0.444 | … | 0.250 | 1.975 | … | 1.983 |
| 2¼ | 2.2500 | 3.375 | 3.300 | 3.450 | 0.444 | … | 0.250 | 2.225 | … | 2.233 |
| 2½ | 2.5000 | 3.750 | 3.675 | 3.825 | 0.500 | … | 0.250 | 2.473 | … | 2.483 |
| 2¾ | 2.7500 | 4.125 | 4.050 | 4.200 | 0.500 | … | 0.250 | 2.723 | … | 2.733 |
| 3 | 3.0000 | 4.500 | 4.425 | 4.575 | 0.500 | … | 0.250 | 2.973 | … | 2.982 |
| 3¼ | 3.2500 | 4.875 | 4.775 | 4.975 | 0.500 | … | 0.250 | 3.223 | … | 3.232 |
| 3½ | 3.5000 | 5.250 | 5.150 | 5.350 | 0.500 | … | 0.250 | 3.473 | … | 3.482 |
| 3¾ | 3.7500 | 5.625 | 5.525 | 5.725 | 0.500 | … | 0.250 | 3.723 | … | 3.732 |
| 4 | 4.0000 | 6.000 | 5.900 | 6.100 | 0.500 | … | 0.250 | 3.973 | … | 3.982 |
ASME B18.31.2 Tap End Full Body Studs Length Tolerances (Inch)
| Range, LT | Tap-End Studs Tolerance |
|---|---|
| From 3/4 through 2 1/2 | ±0.03 |
| Over 2 1/2 through 4 | ±0.05 |
| Over 4 through 8 | ±0.08 |
| Over 8 through 16 | ±0.10 |
| Over 16 | ±0.12 |
ASME Material Specifications
ASTM
A193/A193M Bolting, Stud Bolts, Screws
ASTM
A320/A320M Bolting, Stud Bolts, Screws
ASTM A354
Bolts
ASTM
A449 Hex Cap Screws, Bolts, Studs
ASTM
A453/A453M Bolting, Stud Bolts, Screws, Nuts
ASTM
A574/A574M Standard Specification for Alloy Steel
Socket Head Cap Screws
ASTM
A1014/A1014M UNS N07718 Bolting, Stud Bolts, Screws, Nuts
ASTM
A1082/A1082M Bolting, Stud Bolts, Screws, Nuts
ASTM
F1554 Anchor Bolts, Anchor Rods
ASTM
F2882 Stud Bolts, Screws, Threaded Rod
ASTM
F3042 Socket Set, Square Head Slotted Headless Screw
ASTM
F3125/F3125M Heavy Hex Bolts, Screws, Studs
ASTM
F468/F468M Bolting, Stud Bolts, Screws
ASTM
F593 Bolting, Stud Bolts, Screws
ASTM
F738/F738M Stud Bolts, Screws
ASTM
F835/F835M Standard Specification for Alloy Steel Socket Button and Flat Countersunk
Head Cap Screws
ASTM
F837/F837M Standard Specification for Stainless Steel
Socket Head Cap Screws
ASTM
F880/F880M Standard Specification for Stainless Steel Socket Set Screws
ASTM
F901 Aluminium Transmission Tower Bolts
ASTM
F912/912M Standard Specification for Alloy Steel
Socket Set Screws
EN Material Specifications
EN 10269 Bolting Fasteners, Bolting Stud Bolts, Screws, Nuts, Washers
ISO Material Specifications
ISO
898-1
Bolting Fasteners, Bolting Stud Bolts, Screws
ISO
3506-1
Bolting, Stud Bolts, Screws, Nuts
ISO
3506-5
Bolting, Stud Bolts, Screws, Nuts