Specification

ASTM A194-2HM A194-2H A194-4 A194-7 A194-7M Heavy Hex Nuts with Carbon and Alloy Steel Black/Zinc/H.D.G 1/2~4inch

QBH company will according Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both

This standard is issued under the fixed designation A194/A194M; the number immediately following the designation indicates the year

of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

A superscript epsilon indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense.

Process flow

Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ tapping ➨make heat treatment(if need) ➨ Finish ➨ Packing

Hot forging

Cutting material ➨ hot forging ➨ turning ➨ tapping ➨ make heat treatment(if need) ➨ Finish ➨ Packing

Product Grade

A194-2 A194-2HM A194-2H A194-4 A194-7 A194-7M A194-7L

A194 Grades

Materials and Chemical compstition

1045

42CRMO

A194 Chemical Properties

A194 Mechanical Properties

Grade Identification Marking5	Specification	Material	Nominal Size, In.	Tempering Temp. °F	Proof Load Stress, ksi	Hardness Rockwell		See Note
						Min	Max
	ASTM A194 Grade 2	Medium Carbon Steel	1/4 - 4	0	150	159	352	1,2,3
	ASTM A194 Grade 2H	Medium Carbon Steel, Quenched and Tempered	1/4 - 4	850	175	C24	C38	1,2
	ASTM A194 Grade 2HM	Medium Carbon Steel, Quenched and Tempered	1/4 - 4	1150	150	159	237	1,2,3
	ASTM A194 Grade 4	Medium Carbon Alloy Steel, Quenched and Tempered	1/4 - 4	1100	175	C24	C38	1,2
	ASTM A194 Grade 7	Medium Carbon Alloy Steel, Quenched and Tempered	1/4 - 4	1100	175	C24	C38	1,2
	ASTM A194 Grade 7M	Medium Carbon Alloy Steel, Quenched and Tempered	1/4 - 4	1150	150	159	237	1,2,3
	ASTM A194 Grade 8	Stainless AISI 304	1/4 - 4	-	80	126	300	4
	ASTM A194 Grade 8M	Stainless AISI 316	1/4 - 4	-	80	126	300	4

NOTES:

1. The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When nuts are machined from bar stock, the nut must additionally be marked with the letter 'B'. The letters H and M indicate heat treated nuts.
2. Properties shown are those of coarse and 8-pitch thread heavy hex nuts.
3. Hardness numbers are Brinell Hardness.
4. Nuts that are carbide-solution treated require additional letter A - 8A or 8MA.
5. All nuts shall bear the manufacturer’s identification mark. Nuts shall be legibly marked on one face to indicate the grade and process of the manufacturer. Marking of wrench flats or bearing surfaces is not permitted unless agreed upon between manufacturer and purchaser.
6. Other less common grades exist, but are not listed here.

Finish

Hot Dip Galvanized Mechanical Galvanized
Zinc Plated Cadmium Plated
Yellow Zinc Plated Yellow Cadmium Plated
Black Oxide Plain Surface

PACKING

QBH BULK

20-25KG/CTN,36CTNS/PALLET

20-30KG/BAGS,36BAGS/PALLET

ONE TON/BOXES

50KG/ IRON DRUM,12 IRON DRUMS/PALLET

QBH SMALL PACKING

Packing in small boxes according to customer’s requirements

Packing in plastic bag according to customer’s requirements

QBH PALLET TYPE

SOLID WOOD FUMIGATION PALLET

EURO Pallet

THREE SPLINT PALLET

WOODEN BOX

The advantages of QBH

• QBH brand sales to the main quality assurance.
• Years of export trade management, excellent service, word-of-mouth guarantee.
• By working with TUV,escort for quality.
• Customization of non-standard parts can be made according to customer's requirements and drawings.
• For quality customers,we can provide a certain credit period.

Product application

ASTM A194 2H Heavy Hex Nuts are core products. JIAXING CITY QUNBANG HARDWARE CO.,LTD is an ISO 9001:2015 certified fastener manufacturer ,As directed by the ASTM A-193 specification, these are heavy hex nut pattern nuts that are engineered to mate with A193 B7 Studs. We carry sizes up to 6″ in diameter in both UNC and UNF thread pitch. For sizes 1″ in diameter and larger, 8-TPI is also available as it is commonly used for applications in flanging together pipe and valves.

We also can produce PTFE nuts which some refer to as PTFE 2H Nuts. PTFE blue coated nuts are also very commonly used in the industry as fluropolymer coated fasteners allow for an excellent resistance to corrosion while promising an easy on/easy off assembly.

Also known as heavy hex nuts, these nuts are about 10% wider and taller than standard hex nuts and distribute the load over a large area. Grade 2H nuts are comparable in strength to Grade 9 bolts. They're about 20% stronger than high-strength steel nuts and are used in heavy machinery, such as earth-moving equipment.

Zinc yellow-chromate plated steel nuts resist corrosion in wet environments.

Hot-dipped galvanized steel nuts have a thick coating for better corrosion resistance than zinc-plated steel nuts. They must be used with other hot-dipped galvanized fasteners.

Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.

PTFE-coated steel nuts have a slippery surface to resist sticking during installation. They're resistant to chemicals and salt water.