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BSA31Z8 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BSA31Z8: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: PAN NO. 2, head_height: 0.059 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN, head_diameter: 0.147 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN, thread_length: 0.225 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN, screw_material: STEEL, fastener_length: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-00-453-3632, 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
BSA31Z8
NSN: 5305-00-453-3632
FSC: 5305 — Screws
CAGE: K7766 — BSI STANDARDS LIMITED (GBR)
SPECIFICATIONS
head_stylePAN NO. 2
head_height0.059 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
head_diameter0.147 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN
thread_length0.225 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
screw_materialSTEEL
fastener_length0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleSLOT
nominal_thread_diameter2.2 MILLIMETERS MM
screw_surface_treatmentCADMIUM
thread_series_designatorBA
thread_pitch_in_millimeters0.43
NSN5305-00-453-3632
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BSA31Z8 · 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: 0.059 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
•
SCREW SURFACE TREATMENT: CADMIUM
•
FASTENER LENGTH: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
•
THREAD PITCH IN MILLIMETERS: 0.43
•
THREAD LENGTH: 0.225 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 2.2 MILLIMETERS MM
•
HEAD STYLE: PAN NO. 2
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.059 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
SCREW SURFACE TREATMENTCADMIUM
FASTENER LENGTH0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
THREAD PITCH IN MILLIMETERS0.43
THREAD LENGTH0.225 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER2.2 MILLIMETERS MM
HEAD STYLEPAN NO. 2
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL
INTERNAL DRIVE STYLESLOT
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 2
A31Z8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
21630-123Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BSA31Z8?
BSA31Z8 is a SCREW,MACHINE.
What parts can replace BSA31Z8?
There are 2 known substitutes for BSA31Z8: A31Z8, 21630-123. Substitute compatibility should be verified for your specific system.
What is the NSN for BSA31Z8?
BSA31Z8 is cataloged in the U.S. Government catalog under NSN 5305-00-453-3632. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
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.