ASTM A194 Carbon And Alloy Steel Nuts For Bolts

Scope of ASTM A194 standard

ASTM A194 specification covers a variety of carbon, alloy, and stainless steel nuts in the size range 1/4 through 4 inch. These nuts are intended for high-pressure or high-temperature service, or both.

Steel grade

Carbon steel quality: 1, 2, 2HM, 2H

Ferritic alloy steel quality: 4, 3, 6, 6F, 7, 7M, 16

Austenitic stainless steel quality: 8, 8A, 8C, 8CA, 8M, 8MA, 8T, 8TA, 8F, 8FA, 8P, 8PA, 8N, 8NA, 8LN, 8LNA, 8MN, 8MNA, 8MLN, 8MLNA, 8R, 8RA, 8S, 8SA, 8MLCuN, 8MLCuNA, 9C, 9CA

Types of nut

Screw nuts cover lots of kinds. They are used together with the matching bolts, including cold punched nut, compression nuts, crown nut, differential nut, dome nut, face nut, hand wheel nut, hexagonal nut, left-handed nut, locked nut, square nut, butterfly nut, cap nut, packing nut, self-locking nut, slotted nut, thrust nut, tight nut, U-nut, T-nut, flange nut, union nut and wheel nut.

Main features of screw nuts

Convenient installation or dismantlement, reusable and no gasket required.

Application fields

Automobile industry, compressors, agricultural and military, construction machinery, wind power equipment, casting industry, drilling equipment and mining equipment, shipbuilding industry, public facilities, rail transit, metallurgical equipment, transmission system and so on.

Surface workmanship and marking of the fasteners

1 Nuts shall be free of defects and shall be good commercial finish.

2 If visible surface imperfections in size 1/4 through 1 1/2 inch and M6 through M36 and in any grade other than Grade 8 become a matter of issue between the manufacturer and the purchaser, the cone proof load test shall be employed.

3 If a scale-free bright finish is required, this shall be specified on the purchase order.

4 All nuts shall bear the manufacturer’s identification mark.

5 Nuts shall be legibly marked on one face to indicate the grade and process of the product. Marking of wrench flats or bearing surfaces is not permitted unless agreed upon between manufacturer and purchaser.

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