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Stainless Steel Screws Bolt and Stud

Stainless Steel Fastener Classification

  • Stainless steel bolts Types: stainless steel hexagon head bolts, stainless steel carriage bolts, stainless steel T-bolts, stainless steel square neck bolts, etc.
  • Grade and Materials: The grade of stainless steel bolts is divided into 45, 50, 60, 70, 80, and the materials are mainly austenitic A1, A2, A4, martensitic and ferritic C1, C2, C4.
  • Stainless Steel Screw Types: stainless steel hexagon socket screws, stainless steel machine screws, stainless steel self-tapping screws, stainless steel drill tail screws, stainless steel tightening screws, etc.

Common Types of Stainless Steel Bolts

Stainless steel hexagon head bolts with half threadsM1.6 – M39DIN931
stainless steel hexagon head bolts with full threadsM1.6 – M52DIN933
stainless steel carriage bolts with large round headsM5 – M20DIN603
stainless steel carriage bolts with semi-circular headsM6 – M20GB12
stainless steel T-boltsM5 – M48GB37
Stainless Steel Bolts Types

Stainless Steel Screw Chemical Composition

categorygroupStainless Steel Screw Chemical Composition/%
CSiMnPSCrMoNICu
AusteniticA10.1216.50.20.15~0.3516~190.75~101.75~2.25
A20.1120.050.0315~208~194
A30.08120.0450.0317~199~121
A40.08120.0450.0316~18.52~310~151
A50.08120.0450.0316~18.52~310.5 ~ 141
MartensiteC10.09~0.15110.050.0311.5~141
C30.17~0.25110.040.0316~181.5~2.5
C40.08~0.1511.50.060.15~0.3512~140.61
ferriteF10.12110.040.0315~ 181

Stainless Bolt and Screws for Sale

Hex Head Screws and Bolt

Material: 304、316
Size: M3—M64、3/16”—1-1/2”
Standard: DIN933, DIN931, GB5782, GB5783, GB30, ANSI B18.2.1, JIS B1180

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Socket Screws

Material: 304、316
Size: M2.5—M30、3/16”—5/8”
Standard: DIN912、DIN7984、GB70.1、 ANSI B18.3

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Flange Screws

Material: 304、316
Size: M5—M12
Standard: DIN6921、GB5787、GB5789

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Carriage Bolt

Material: 304、316
Size: M6—M16、1/4”—1/2”
Standard: DIN603、GB12、ANSI B18.5

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T Bolt

Material: 304、316
Size: M5—M12
Standard: GB37

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Segment Bolt

Material: 304、316
Standard: non-standard, Customized Production

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CSK Hex Socket Screw

Material: 304、316
Size: M5—M12
Standard: GB37

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Cross Recessed Hexagon Bolts

Material: 304、316
Size: M3—M6
Standard: GB29.2

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Thread Rod

Material: 304、316
Size: M3—M48、10#—1-1/2”
Standard: DIN975、IFI 136

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Expansion Bolt

Material: 304、316
Size: M6—M16
Standard: GB22795

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Self Drilling Tapping Screw

Material: 304、316
Size: ST2.2—ST6.3
Standard: GB845、GB846、GB847、DIN7981、
DIN7982、DIN7983、GB2670.1、
GB2670.2、ISO14585、ISO14586、
JIS B1122、YB845、YB846、YB407

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Stud Bolts

Material: 304、316
Size: M3—M42
Standard: DIN976、GB901、GB898、GB899、GB897、GH20634、U bolt

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Chemical Anchor Bolts

Material: 304、316
Standard: Customized Production

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Wing Bolts

Material: 304、316
Size: M3—M10
Standard: DIN316

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Pentagonal Headed Bolt

Material: 304、316
Size: M6—M12

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Wood Screws

Material: 304、316
Size: M5—M12
Standard: DIN571

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Button Screws

Material: 304、316
Size: M3—M16
Standard: ISO7380

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Pins

Material: 304、316
Size: ∮1.0—∮6.0
Standard: GB91、DIN94

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Rivets

Material: 304、316
Size: M5—M12
Standard: DIN571

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Cylindrical Pins

Material: 304、316
Size: M8—M60、1/16”-2”
Standard: ANSI/ASME B18.8.2、GB119.1、
GB879、GB119.1、GB879.3、
GB120.1、DIN1471、DIN1472、
DIN1473、DIN1474、DIN1475

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Machine Screws

Material: 304、316
Size: M1.6—M10、2#—3/8”
Standard: GB818、GB819、DIN966、DIN7985、
DIN965、GB67、GB68、GB2672、
GB2673.1、ISO14581、ISO14583、
ANSIB18.6.3P、ANSIB18.6.3F、
JIS B1111、YB818、YB819、YB406

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Stainless Steel Nuts and Washers

Hex Nut

Material: 304、316
Size: M2—M80、4#—2-1/2”
Standard: DIN934、DIN439、DIN936、GB6170、
GB6175、GB52、GB6172、JISB1181
ANSI B18.2.2、HG20634、UNI5587

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Hex Heavy Nut

Material: 304、316
Size: 1/4”—2-1/2”
Standard: ANSI B18.2.2

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Square Nut

Material: 304、316
Size: M3—M8、1/4”—3/8”
Standard:DIN557、DIN562、GB39、
ANSI B18.2.2

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Carriage Bolt

Material: 304、316
Size: M3—M30、1/4”—1/2”
Standard: DIN1587、SAE483

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Flange Nylon Nut

Material: 304、316
Size: M5—M12
Standard: DIN6926

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Metal Locking Nut

Material: 304、316
Size: M4-M20
Standard: DIN980M

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Weld Nut

Material: 304、316
Size: M4—M16
Standard: DIN928、DIN929

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K nuts

Material: 304
Size: M3—M8、4#—5/16”

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Turn Buckles

Material: 304、316
Size: M6—M12
Standard: DIN582

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Eye Bolt

Material: 304、316
Size: M6—M16
Standard: DIN580

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Socket Head Set Screw

Material: 304、316
Size: M4—M48、10#—1-1/2”
Standard: DIN913、DIN914、DIN916、GB77、
GB78、GB80

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Hose Clamps

Material: 304、316
Size: 9mm、12mm
ANSI:10mm、12mm、12.7mm

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Flang Nut

Material: 304、316
Size: M3—M20、1/4”—3/4”
Standard: DIN6923、IFI 145

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Wing Nuts

Material: 304、316
Size: M3—M12、5/32”—1/2”
Standard: DIN315、ASME B18.6.9

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Hex Nylon Nut

Material: 304、316
Size: M2.5—M30、6#—1/2”
Standard: DIN985、DIN982、ASME B18.6.6、
GB889.1

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Washers

Material: 304、316
Size: M2-M45、4#—1-1/2”
Flat Washer Standard: DIN125A、DIN9021、ANSI B18.22.1、
GB9074.24、GB848
Spring Washer Standard: GB93、DIN127B、DIN7980、GB7244、
ANSI B18.21.1、GB9074.26、JIS B1251

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A1-A5 Stainless Steel Fastener Features

The A1 group steel is specially designed for mechanical processing. It has a relatively high sulfur content and lower corrosion resistance than steel with corresponding standard sulfur content. The A2 group steel is the most widely used stainless steel, which can be used in kitchen equipment and chemical equipment. The A3 group steel is a stable stainless steel with the same performance as the A2 group steel. The A4 group steel is acid-resistant steel, containing Mo element, and has good corrosion resistance. The A5 group steel is a stable acid-resistant steel with the same performance as the A4 group steel.

Stainless Steel Screws from AGICO

Our stainless steel screws are mainly made of austenitic stainless steel SUS304 and SUS316. SUS304, also known as A2, is mainly used for the manufacture of ordinary stainless steel bolts, screws, washers, and nuts, with a strength grade of 70 for bolts. SUS316, also known as A4, is mainly used for the manufacture of high-corrosion-resistant stainless steel bolts, screws, washers, and nuts, with a strength grade of 70 for bolts, which can also reach high strength grade 80.

SUS304 and SUS316 stainless steel are generally non-magnetic in normal state. They have slight magnetism after cold working and can maintain their structure without phase change at various temperatures, so they cannot be hardened by heat treatment.

The performance level of stainless steel screws is composed of two numbers, representing its tensile strength divided by 10. The performance level of austenitic steel is 50, 70, 80, for example, the performance level of A2 group steel is represented by A2-50, A2-70, A2-80, etc.

A2-70 means austenitic steel, cold-worked, with a minimum tensile strength of 700N/mm2 or 700MPa.

TypeGroupStrength Levelthread diameterTensile strength σb min/MpaSpecified non-proportional elongation stress σp0.2 min/MPaElongation after breaking δ min/mm
AusteniticA1、A2、A3、A4、A550≤M395002100.6d
70≤M2470045004d
80≤M248006000.3d

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