Nuts

Types of Nuts

Hex Nuts

Nylon Lock Nuts

Kep Nuts

Flange Nuts

Spring Nuts

Cap Nuts

Coupling Nuts

Wood Nuts

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The Guide To Nuts

Guide 1

What are the Nuts?

Guide 2

Parts Name of the Nut

Guide 3

Meaning of Nut Grade

Guide 4

Designation of the Nut

Guide 5

Inspection of Nuts

Guide 6

Packaging of Nuts

Guide 7

Production Time of Nuts

Guide 8

Inquiry Required Content

Guide 1

What are the Nuts?

A nut is a geometrically designed block(usually of metal) with an internal thread and designed to be assembled in conjunction with a bolt or screw.

Guide 2

Parts Name of the Nut

Width Across Corners(e): The width across corners of a hexagon, square or rectangular geometry measured from corner to corner.

Width Across Flats(s): The width across flats of the hexagon or square heads of the fastener is the distance measured across the flats of the fastener head.

Major Diameter(d): This is the diameter of an imaginary cylinder parallel with the crests of the thread; in other words it is the distance from crest to crest for an external thread, or root to root for an internal thread.

Nut Thickness(m): Nut thickness is the overall distance from the top of the nut to the bearing surface, measured parallel to the axis of the nut.

Guide 3

Meaning of Nut Grade

SAE Nut Grades—The standards for Nut strength grades in the U.S. are set according to a system developed by the SAE (Society of Automotive Engineers). The SAE marking system uses raised dashes on the bolt head to indicate strength.

Metric Nut Grades—Metric grades are set according to rules set by the ISO (International Standards Organization). The grades consist of two numbers separated by a dot. The property class is expressed in raised or depressed numerals on top or on the side of the bolt head.

ASTM Nut Grades—The ASTM grade standard is set by the American Society for Testing and Materials. Its strength grades are indicated by the letter A plus three numerals stamped on the bolt head.

Grade: Used for INCH fasteners to designate the strength of the fastener.

Class: Used for METRIC fasteners to designate the fastener strength. Class is a material designation equivalent to the US term Grade.

Proof Load: The proof load of a nut is the axially applied load the nut must withstand without thread stripping or rupture. The proof load of a bolt, screw, or stud is the specified load the product must stand without a permanent set.

Rockwell Hardness: A relative measure of hardness. Rockwell C Scale is used for hard materials, Rockwell B for softer materials, such as sheet metal.

Low Carbon Steel: Low Carbon Steel generally contains less than 0.25% carbon. It has outstanding ductility and toughness, is easily machined and welded, and is relatively inexpensive to produce. It has a tensile strength of between 60,000 psi to 80,000 psi. (410 Mpa to 550 Mpa).

SAE Grade 2 (Metric class 4.6, 4.8 & 5.8) fasteners are generally made out of low carbon steel with AISI grades 1006, 1010, 1016, 1018, 1022 & 1035 falling into this category.

Medium Carbon Steel: Medium carbon steel has a carbon content of between 0.25% to 0.60%. It is easily heat treated and has a tensile strength of between 100,000 psi to 120,000 psi. (690MPa to 830MPa).

SAE Grade 5 (Metric class 8.8) fasteners are generally made out of medium carbon steel with AISI grades 1038, 1541, 5132&5135 falling into this category.

Guide 4

Designation of the Nut

INCH FASTENERS

Nuts shall be designated by the following data in the sequence shown:
(a) product name
(b) dimensional standard, nominal size (fraction or decimal)
(c) threads per inch
(d) basic width across flats (when applicable)
(e) mechanical and performance standard
(f) protective finish, if required

See the following examples:

EXAMPLES:

(1) Square Nut, ASME B18.2.2, 1/2″-13, ASTM A563 Grade A, Zinc Plated per ASTM F1941 Fe/Zn 3A

METRIC FASTENERS

Nuts shall be designated by the following data in the sequence shown:
(a) product name
(b) dimensional standard, nominal size (fraction or decimal)
(c) pitch
(d) basic width across flats (when applicable)
(e) mechanical and performance standard
(f) protective finish, if required

See the following examples:

EXAMPLES:

(1) Hexagon Nut DIN934 – M16x1.5 – Class 8 – ZP per ISO 4042 A2F

Guide 5

Inspection of Nut

Vernier Caliper

Will use vernier calipers to measure the basic dimensions of nuts, like width across flats, thickness and so on.

Thread Plug&Ring Gauge

Will use thread plug&ring gauge to test GO/NO GO, including metric thread (Coarse&Fine), inch thread (UNC&UNF).

Rockwell Hardness Tester

Will use rockwell hardness tester(HRC) to measure the hardness of nuts.

Coating Thickness Gauge

Will use coating thickness gauge to measuere the thickness of the coating layer, such as ZP and HDG.

Guide 6

Packaging of Nuts

Usual Packaging

Label: black text on white, no pattern and barcode

Carton: standard double corrugated neutral carton, bulking packing, maximum load bearing: 25kg per carton

Pallet: Europe Fumigation Pallet, 36 cartons per pallets, Width 800mm x Length 1200mm

Guide 7

Production Time of Nuts

Flow 01: Need 3 Days – Analyze Customers’ PO and Place Orders to the Factory

Flow 02: Need 10 Days – Purchase the Raw Material

Flow 03: Need 15 Days – Make Production Plan and Wait for Starting Production

Flow 04: Need 15 Days – Formal Mass Production

Flow 05: Need 7 Days – Send Out to Do Heat Treatment (if exist)

Flow 06: Need 7 Days – Send Out to Do Surface Treatment (Finish)

Flow 07: Need 7 Days – Packaging, Make the Shipment

Total Time: 60 Days to 70 Days

Guide 8

Inquiry Required Content

Let us know who you are, and we can contact you in time.

We will give you a more reasonable price.

Let us know your needed product well.

Let us know if the products need to do the heat treatment.

Zinc Electoplated or Hot Dip Galvanized Coating or Zinc Flake Coating…

Our MOQ is about 1 pallet (900KGS) per size.

If it is a customized package, we will send the carton/label to you by courier for confirmation before packaging.

We will make a more suitable production plan for you.

FOB (We usually quote based on FOB ), CIF, FCA

This information is important before mass production. We will adjust the production plan according to your requirement.

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