What makes the knurled head different from a standard socket head cap screw?

The knurled rim on the head circumference gives extra grip for easy manual pre-tightening and part identification, while the hex socket drive still delivers full tightening torque in confined spaces. Head dimensions and hex sizes follow ISO 4762, so standard hex keys and wrenches are used.

Can these screws be used in food, pharma or cleanroom equipment, and at what temperature?

Yes. The passivated A2 surface has no plating layer to peel or contaminate, which suits hygienic and cleanroom environments. Working temperature range is -60 to 300 -(304 class).

A2-70 Stainless Steel Knurled Head Socket Cap Screw ISO 4762 Fully Threaded

Name: A2-70 Stainless Steel Knurled Head Socket Cap Screw ISO 4762 Fully Threaded
Brand: Fasto Industrial Co., Ltd.
SKU: 2328206985

Tianjin, ChinaFasto Industrial Co., Ltd.

US$0.02-0.15

1 Piece

Product profile

Customization

Available

Material

Carbon Steel

Type

Austenitic Stainless Steel A2 (Approx. 304 / 1.430

Model NO.

Fasto-Hex Socket Screw

Groove

Hex Socket (Internal Hex) Drive

Connection

Common Bolt

Head Style

Hex Socket Head

Standard

DIN, GB, ANSI, BSW, JIS, GOST

Grade

4.8

Product Name

Knurled Head Socket Cap Screw, Fully Threaded

Thread

Fully Threaded Shank, Metric Thread Tolerance 6g

Head Type

Pan, Truss, Flat, Round, Hex, Cheese, Binding, Csk

Drive Type

Hex Socket (Internal Hex) Drive

Head Design

Knurled Rim for Manual Pre-Tightening

Surface Finish

Bright Passivated; Polished / Lubricated Optional

Mechanical Properties

Tensile Min. 700 MPa; RP 0.2 Min. 450 MPa; 95-215

Delivery Time

10-25days

Working Temperature

-60 °C to 300 °C (304 Class)

Application

Food / Pharma / Cleanroom, Water Treatment, Automa

Alternative Grades

A2-80, A4 (316 Class) for Marine Service

Certificates & OEM

Surface ≥ 560 Hv0.3; Core 270-350 Hv (Typical)

Corrosion Resistance

ISO 9001:2015 Factory; Mtc & Coc Per Shipment; OE

Acceptance Inspection

ISO 3269

Customization / OEM

Available (Custom Lengths, Sizes Per Drawing; A2-8

Transport Package

Box / Bulk Packing / Pallet or Customized Packing

Specification

M3 - M16 (custom to M24)

Trademark

Fasto

Origin

Tianjin, China

HS Code

7318150000

Production Capacity

30000tons/Year

Key features

Hygienic lines reject plating. The bright-passivated A2 surface carries no plating layer to peel, flake or contaminate - it stays easy to clean and is suited to food, pharma and cleanroom equipment.

Confined spaces kill torque. The hex socket drive delivers high tightening torque exactly where a wrench or spanner cannot reach.

Manual pre-tightening slips and slows assembly. The knurled rim on the head circumference gives a secure finger grip for comfortable hand pre-tightening and clear part identification.

Through-hole assemblies waste thread length. The fully threaded shank maximizes thread engagement along the whole length for the strongest holding.

Mixed material batches break traceability. Every head is stamped "A2-70", so the material group and property class can be identified at a glance and traced to the batch.

Mildly corrosive service rusts ordinary screws. A2 (304 class) performs well in atmospheric, fresh water and mildly corrosive environments; Mo-bearing A4 (316 class) can be supplied for marine or high

Soft stainless threads strip under torque. Cold-worked A2-70 reaches a minimum tensile strength of 700 MPa and proof stress of 450 MPa - real holding strength, not soft annealed stock.

Wide service temperature from -60 to 300 (304 class) suits processing lines, chillers and hot-service equipment.

Company profile

Fasto Industrial Co., Ltd.

Tianjin, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service AvailableExport Year: 2023-04-12 CertifiedNearest Port: Ningbo port, Tianjin port, Qingdao portAverage Response Time: ≤8.84h CertifiedTerms of Payment: T/T

About Our Factory & Business Background

AddressRoom 1806, Block B, Soho, Lvdi, Yanta District, Xi 'an, Shaanxi, Tianjin, China

Plant Area128.24 square meters

Number of Employees20

Registered Capital1,000,000 RMB

International Commercial Terms(Incoterms)FOB, CIF, CFR

Average Lead TimePeak Season Lead Time: 1-3 months Off Season Lead Time: one month

Our Production Capability & Technical Expertise

Main ProductsRivets, Nuts, Screws, Bolts, Washers, Anchors, Tools

Production MachinesCold heading machine

R&D Engineers2 people

Our Industry Experience & Global Business Record

Main MarketsNorth America, South America, Europe, Southeast Asia/ Mideast, Africa, Australia

Number of Foreign Trading Staff8

Overseas Agent/BranchNo

Our Certifications, Standards & Industry Recognition

Product CertificationCE

Product Q&A

Q:Can you make custom lengths?

Yes. This screw is available fully threaded in custom lengths, per the ISO 4762 series or your drawing. OEM / ODM production accepts drawings, or just dimensions when no drawing is available - a model / sample is confirmed before mass production.

Q:Do you provide samples?

Yes. Free samples can be arranged and dispatched within 7 days for evaluation before your order.

Q:Is A2-70 the only available grade?

A2-70 is the standard grade for this item. Higher classes such as A2-80, or Mo-bearing A4 (316 class), can be evaluated for your application.

Q:How does A2 stainless resist corrosion - when should I choose A4?

A2 (304 class) performs well in atmospheric, fresh water and mildly corrosive service, and its bright-passivated surface is easy to clean for hygienic applications. For marine or high-chloride coastal environments, A4 (316 class) is recommended.

Q:What are your MOQ, lead time and packing?

MOQ is 1,000 pieces; mixed-size trial orders are accepted. Free samples within 7 days, stock sizes dispatch in 7-10 days, production orders 20-40 days, full orders typically 1-2 months. Export packing in cartons, woven bags or wooden pallets with rust protection for sea shipment; custom packaging available.