B1821 Fine Thread Bolts
Military Standard ASME B18.2.1.BH
B1821 Fine Thread Bolts are hex cap screws with a UNF-2A Fine Thread. The series has many options for length and thread diameter as well as features such as drilled or undrilled heads. B1821 Bolts adhere to strict military standards for material and construction. B1821 steel bolts have a tensile strength of 150,000 psi which is equivalent to Grade 8 steel screws. B1821 Bolts are cadmium plated to resist corrosion in wet environments. Length is measured from under the head. Material is Alloy Steel to ASTM A354BD. Finish is Zinc Yellow Plating to ASTM B633.
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| B1821 Series Fine Thread - Undrilled Head | |||||
|---|---|---|---|---|---|
| Length | Part Number | NATO Stock Number NSN | Replaced MS90726 | Replaced NSN | |
| 1/4" 28-UNF-2A Fine Thread | |||||
| 3/8" | B1821BH025F044N | 5305-01-608-4532 5305-00-267-8951 | MS90726-2 | 5305-00-068-0503 | |
| 1/2" | B1821BH025F050N | 5305-00-267-8952 | MS90726-3 | 5305-00-068-0504 | |
| 9/16" | B1821BH025F056N | 5305-00-068-0512 | MS90726-4 | 5305-00-267-8973 | |
| 5/8" | B1821BH025F063N | 5305-00-267-8953 | MS90726-5 | 5305-17-107-0310 | |
| 3/4" | B1821BH025F075N | 5306-00-068-0513 | MS90726-6 | 5305-00-068-0506 | |
| 7/8" | B1821BH025F088N | 5305-01-608-4537 5306-00-068-0514 | MS90726-7 | ||
| 1" | B1821BH025F100N | 5305-00-068-0515 | MS90726-8 | 5305-01-411-3898 5305-00-267-8974 | |
| 1-1/8" | B1821BH025F113N | 5305-00-068-0516 | MS90726-9 | 5305-00-267-8975 | |
| 1-1/4" | B1821BH025F125N | 5305-00-267-8954 | MS90726-10 | ||
| 1-3/8" | B1821BH025F138N | 5305-00-267-8955 | MS90726-11 | 5305-00-267-8976 | |
| 1-1/2" | B1821BH025F150N | 5305-00-267-8956 | MS90726-12 | 5305-00-267-8978 | |
| 1-3/4" | B1821BH025F175N | 5305-00-267-8957 | MS90726-13 | 5305-00-267-8979 | |
| 2" | B1821BH025F200N | 5305-00-267-8958 | MS90726-14 | 5305-00-267-8980 | |
| 2-1/4" | B1821BH025F225N | 5305-00-267-8959 | MS90726-15 | 5305-00-267-8982 | |
| 2-1/2" | B1821BH025F250N | 5305-00-267-8960 | MS90726-16 | 5305-00-267-8983 | |
| 2-3/4" | B1821BH025F275N | 5305-00-267-8961 | MS90726-17 | 5305-00-267-8984 | |
| 3" | B1821BH025F300N | 5305-00-267-8962 | MS90726-18 | 5305-00-267-8985 | |
| 3-1/4" | B1821BH025F325N | 5305-00-267-8963 | MS90726-19 | 5305-00-267-8986 | |
| 3-1/2" | B1821BH025F350N | 5305-00-267-8964 | MS90726-20 | 5305-00-267-8987 | |
| 3-3/4" | B1821BH025F375N | 5305-00-267-8965 | MS90726-21 | ||
| 4" | B1821BH025F400N | 5305-00-267-8966 | MS90726-22 | 5305-00-267-9689 | |
| 4-1/4" | B1821BH025F425N | 5305-00-267-8967 | MS90726-23 | 5305-00-267-9690 | |
| 4-1/2" | B1821BH025F450N | 5305-00-267-8968 | MS90726-24 | ||
| 4-3/4" | B1821BH025F475N | 5305-00-267-8969 | MS90726-25 | 5305-00-267-9692 | |
| 5" | B1821BH025F500N | 5305-00-267-8970 | MS90726-26 | 5305-00-267-9693 | |
| 5/16" 24-UNF-2A Fine Thread | |||||