21311-28 — BOLT,INTERNAL WRENCHING

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

21311-28: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 AND STEEL COMP 4140 AND STEEL COMP 8740 OR STEEL COMP 8735 OVERALL, head_style: BEVEL-CONICAL, head_height: 0.312 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.521 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN, thread_length: 0.537 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-415-6734, 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

21311-28

NSN: 5306-01-415-6734
FSC: 5306 — Bolts
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)

SPECIFICATIONS

material	STEEL COMP 4340 AND STEEL COMP 4140 AND STEEL COMP 8740 OR STEEL COMP 8735 OVERALL
head_style	BEVEL-CONICAL
head_height	0.312 INCHES NOMINAL IN
thread_class	3A A
head_diameter	0.521 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
thread_length	0.537 INCHES MINIMUM IN
fastener_length	4.688 INCHES NOMINAL IN
hardness_rating	34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
thread_direction	RIGHT-HAND
surface_treatment	CADMIUM AND CHROMATE OVERALL
width_across_flats	0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN
internal_drive_style	HEXAGON
NSN	5306-01-415-6734

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN

•

HEAD HEIGHT: 0.312 INCHES NOMINAL IN

•

FASTENER LENGTH: 4.688 INCHES NOMINAL IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416, TYPE 2, CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL

•

THREAD LENGTH: 0.537 INCHES MINIMUM IN

•

HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL

•

NOMINAL THREAD DIAMETER: 0.312 INCHES IN

•

HEAD STYLE: BEVEL-CONICAL

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN
HEAD HEIGHT	0.312 INCHES NOMINAL IN
FASTENER LENGTH	4.688 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416, TYPE 2, CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD LENGTH	0.537 INCHES MINIMUM IN
HARDNESS RATING	34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER	0.312 INCHES IN
HEAD STYLE	BEVEL-CONICAL
THREAD DIRECTION	RIGHT-HAND
SURFACE TREATMENT	CADMIUM AND CHROMATE OVERALL

OTHER ITEMS IN FSC 5306 — Bolts

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017

SUBSTITUTES & CROSS-REFERENCES 1

21817 FIND 18Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 21311-28?

21311-28 is a BOLT,INTERNAL WRENCHING.

What parts can replace 21311-28?

There is 1 known substitute for 21311-28: 21817 FIND 18. Substitute compatibility should be verified for your specific system.

What is the NSN for 21311-28?

21311-28 is cataloged in the U.S. Government catalog under NSN 5306-01-415-6734. This indicates validated use in U.S. government and defense supply chains.

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21311-28 — BOLT,INTERNAL WRENCHING

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