Machine Bolt P/N B1821BH031F175N

Specifications

Thread class

2A

Thread direction

Right-Hand

Thread length

0.874–1.062 in

Fastener length

1.688–1.750 in

Head height

0.195–0.211 in

Width between flats

0.489–0.500 in

Nominal thread diameter

Inches 0.312

Features provided

Finished Head

Thread quantity per inch

24

Minimum tensile strength

Pounds Per Square Inch 150000

Hardness rating

Overall Rockwell C Minimum 32.0 and Rockwell C Maximum 38.0

Surface finish

Threads Microinches 63.0

Material

Overall Steel

Material document and classification

Overall Assn STD Single Material Response SAE GR 8

Surface treatment

Overall Zinc and Chromate

Surface treatment document and classification

Overall Assn STD Single Treatment Response Ast- B633 TY 2 SC 3

Thread series designator

UNF

From the federal catalog's item characteristics for this NSN. Confirm critical dimensions against your part or drawing before ordering.

Cross-reference part numbers

B1821BH031F175N 454888 181345 MS35304-039 MS35304-39 MS90727-39

Also referenced as

6477-50

Older, superseded, advisory or drawing numbers the federal catalog associates with this NSN — the ones in an old manual. They find the item; confirm the current part number when you order.

Shown for identification only. SECO can quote against any of these numbers.

Logistics data

Source of supply	SMS DLA Land and Maritime, Columbus, Ohio
Acquisition advice code	D DLA/GSA stocked — stocked by DLA or GSA and issued from central stock
Unit of issue	HD hundred
Demilitarization code	A Demilitarization not required — non-munitions-list item
Controlled inventory code	U Unclassified
Hazardous material indicator	N No hazardous material

Source: public FLIS/PUB LOG cataloging data.

Why buy from SECO

These quantities sit on our own shelves — we are a stocking supplier, not a broker sourcing after you order. Condition-coded stock, formal quotes with NSN/PN on the paperwork, POs and GPC welcome, fast U.S. shipping.

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FAQ

What is NSN 5306-00-051-4081?
NSN 5306-00-051-4081 (5306000514081) — Machine Bolt: SECO Parts has 2,132 in stock in Augusta, GA, on our own shelf. It is the NATO Stock Number for machine bolt in federal supply class 5306 (Bolts).

Is NSN 5306-00-051-4081 available?
SECO Parts has 2132 in stock in Augusta, GA — order or request a quote below.

How much does NSN 5306-00-051-4081 cost?
SECO quotes NSN 5306-00-051-4081 on request, usually the same business day.

What part numbers cross-reference to NSN 5306-00-051-4081?
Part numbers that cross-reference this NSN include B1821BH031F175N, 454888, 181345, MS35304-039, MS35304-39, MS90727-39. It is also referenced by older, superseded or advisory numbers: 6477-50. SECO can quote against any of them.