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ASME B 18.2.1 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ASME B 18.2.1: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL UNS K04100 OVERALL, head_style: HEXAGON, head_height: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.250 INCHES NOMINAL IN, fastener_length: 1.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-019-0882, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
ASME B 18.2.1
NSN: 5306-00-019-0882
NIINs: 000190882, 000223843, 000426921, 000426922, 000426937, 000501237, 000501239, 000514075, 000514077, 000514087, 000680500, 000680504, 000680511, 000680516, 000711783, 000711784, 000711787, 000711788, 000711789, 000712055, 000712061, 000712064, 000712065, 000712068, 000712073, 000712076, 000712077, 000712081, 000712084, 000712233, 000712237, 000712506, 000712507, 000712508, 000826821, 000853224, 001054061, 001451064, 001526324, 001526326, 001526331, 001775281, 001775505, 001775542, 001775622, 001775651, 002253841, 002253842, 002253844, 002264823, 002264826, 002264829, 002264833, 002264834, 002264838, 002264843, 002264845, 002267767, 002267768, 002573125, 002604491, 002678951, 002693206, 002693235, 002693239, 002693243, 002693247, 002693248, 002694530, 002694531, 003975356, 004025748, 004025757, 004025759, 004065178, 004069219, 004069224, 004069225, 004069226, 004129796, 004948529, 005147883, 005274957, 005432419, 005503686, 005585419, 006377708, 006388920, 006394906, 006876613, 006882111, 007098283, 007098284, 007098515, 007098516, 007098517, 007098523, 007098539, 007167356, 007167454, 007167675, 007195235, 007195241, 007215492, 007247218, 007247219, 007247224, 007247225, 007247228, 007247248, 007247263, 007247264, 007247265, 007247266, 007250154, 007262543, 007262544, 007262551, 007262556, 007285474, 007285475, 007626041, 007813926, 007813927, 007813930, 007829489, 008022764, 008080864, 008213869, 008368346, 008797941, 009000576, 009001118, 009037767, 009044006, 009044008, 009143782, 009143784, 009143786, 009146131, 009158057, 009166467, 009210890, 009210929, 009227994, 009261826, 009265519, 009265604, 009323280, 009352931, 009397063, 009399204, 009408068, 009408069, 009422196, 009474351, 009474352, 009474354, 009474355, 009474357, 009474362, 009480749, 009585471, 009597818, 009640503, 009640518, 009900695, 009908632, 009980673, 010062070, 010062074, 010096628, 010102362, 010145124, 010153356, 010156638, 010322313, 011124339, 011124341, 011126094, 011128681, 011128682, 011128683, 011130525, 011139748, 011179415, 011179416, 011182445, 011183133, 011196763, 011199321, 011230891, 011284096, 011554362, 011565437, 011755359, 011757558, 011940589, 011944974, 011951579, 011951580, 011959819, 011960218, 011960219, 011963856, 011966740, 011966741, 011971598, 011971599, 011972531, 011972532, 011976578, 011981700, 011984665, 011994344, 012006257, 012036433, 012052798, 012052799, 012052800, 012052801, 012109420, 012117474, 012124542, 012157279, 012194131, 012195400, 012200187, 012299592, 012532999, 012534427, 012534428, 012696084, 012731486, 012731492, 012759466, 012770458, 012776415, 012805703, 012888875, 013416720, 013960995, 014289197, 014299149, 014575175, 014764652, 014826302, 014834488, 014842942, 014872938, 014935648, 014963373, 014970397, 014976419, 014993784, 015071575, 015071723, 015164016, 015181344, 015243294, 015289981, 015335404, 015570509, 015572705, 015661425, 015801122, 016239963, 016291922, 016305946, 016307069, 016704103, 016775499, 016816494, 016861200, 016926174, 016926260, 016953601, 017019478, 017022089, 017273292
FSC: 5306 — Bolts
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
materialSTEEL UNS K04100 OVERALL
head_styleHEXAGON
head_height0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
thread_class2A A
thread_length1.250 INCHES NOMINAL IN
fastener_length1.250 INCHES NOMINAL IN
special_featuresNSN ASSIGNED IN SUPPORT OF ARMY CLEAN HARDWARE ABATEMENT INITIATIVE
thread_directionRIGHT-HAND
width_between_flats0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch13
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5306-00-019-0882
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ASME B 18.2.1 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HEAD HEIGHT: 0.232 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.000 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 1.000 INCHES MINIMUM IN
•
HARDNESS RATING: 70.0 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429 TY2CL3 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
HEAD STYLE: SQUARE
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.232 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
FASTENER LENGTH3.000 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH1.000 INCHES MINIMUM IN
HARDNESS RATING70.0 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE J429 TY2CL3 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLESQUARE
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH2.000 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 6
FF-B-575Reference document
Same NSN cross-reference
Reference document — Secondary reference
190882Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
B18.2.1Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS35355-69Reference document
Same NSN cross-reference
Reference document — Secondary reference
FF-B-575 TY1Reference document
Same NSN cross-reference
Reference document — Secondary reference
3-8 16X3INReference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ASME B 18.2.1?
ASME B 18.2.1 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace ASME B 18.2.1?
There are 6 known substitutes for ASME B 18.2.1: FF-B-575, 190882, B18.2.1 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ASME B 18.2.1?
ASME B 18.2.1 is cataloged in the U.S. Government catalog under NSN 5306-00-019-0882. This indicates validated use in U.S. government and defense supply chains.
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U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.