A4-80 stainless steel socket screws factory
XZ Fastener manufactures A4-80 stainless steel socket screws for buyers who need higher-strength stainless fasteners with clean internal hex drive control. These screws are commonly specified as DIN 912 / ISO 4762 socket head cap screws, Allen head screws, or drawing-based socket fasteners according to order requirement. A4-80 is often selected for marine equipment, chemical machinery, outdoor assemblies, and stainless structures where A4 corrosion resistance and higher strength are both important. Buyers can source stainless steel socket head cap screws with finish, packing, and inspection details confirmed before production.
قياسي
DIN 912 / ISO 4762; custom drawings available
Strength
A4-80; A4-70 and A2-70 available upon request
مادة
A4 / 316-family austenitic stainless steel
Finish
Plain, passivated, pickled and passivated, lubricated
تطبيق
Marine machinery, chemical equipment, precision assemblies
What Buyers Should Know Before Sourcing A4-80 Stainless Steel Socket Screws
A4-80 socket screws combine stainless corrosion resistance with a higher property class than A4-70. Before sourcing, buyers should confirm whether the order requires DIN 912 / ISO 4762 socket head cap screws, low head socket screws, button head socket screws, countersunk socket screws, or a drawing-based design.
Confirm head style and drive
Socket screws are not the same as external hex bolts. Internal hex drive depth, socket size, head diameter, head height, and thread length should match the assembly tool and clearance space. Related metric Allen head socket cap bolts can be reviewed when the buyer needs standard DIN 912 items.
Check A4-80 availability by size
A4-80 can be more demanding than A4-70, especially in larger diameters or special lengths. Size, thread pitch, mechanical requirement, and inspection documents should be confirmed before the factory commits production.
Plan against thread galling
High-strength stainless socket screws can gall during fast assembly or dry tightening. Lubrication, anti-seize compound, mating nut material, and tightening method should be reviewed for repeated assembly or high clamp load applications.
Common Purchasing Descriptions
Clear purchasing descriptions help avoid wrong head type, wrong property class, or mixed stainless grades. Common buyer wording includes:
- A4-80 stainless steel socket screws DIN 912, M8 x 30, full thread, passivated finish.
- ISO 4762 A4-80 stainless socket head cap screws, metric coarse thread, plain finish.
- 316 stainless steel Allen head screws, A4-80, with material test certificate available upon request.
- A4-80 socket cap screws with matching stainless flat washers and spring lock washers.
- Special socket screws according to drawing, A4 stainless steel, higher-strength property class, controlled head dimensions.
- Separate carbon steel items such as Grade 8.8 carbon steel hex bolts, DIN 933 full thread hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts when the order includes both socket screws and external hex fasteners.
If the inquiry includes socket screws and metric hex head bolts together, list each product family separately with its own standard, material, grade, finish, and packing requirement.
Detailed Specifications Table
| عنصر | المواصفات | Buyer Notes |
|---|---|---|
| Product name | A4-80 stainless steel socket screws | Also described as A4-80 socket head cap screws or Allen head screws. |
| Common standards | DIN 912, ISO 4762, drawing-based socket screws | State the exact standard because head dimensions may differ. |
| Diameter range | Common metric sizes such as M3-M24; other sizes reviewed by order | A4-80 availability should be checked by diameter and length. |
| Length | Standard lengths or custom lengths according to drawings | Specify full thread, partial thread, or exact thread length. |
| Thread | Metric coarse thread; fine pitch available upon request | Fine pitch must be clearly marked on drawings and packing lists. |
| مادة | A4 / 316-family austenitic stainless steel | Final chemical composition follows the selected standard and purchase order. |
| Property class | A4-80 under ISO 3506 reference | A4-70 may be more economical where A4-80 is not required. |
| Finish | Plain, passivated, pickled and passivated, lubricated | Finish should match corrosion exposure and assembly method. |
| Inspection | Dimensions, socket gauge, thread gauge, visual appearance, material documents, mechanical reports upon request | Socket depth and drive quality are important control points. |
| Packing | Bulk cartons, small boxes, bags, pallet packing, labels, barcodes, private packing | Can be supplied according to order requirement. |
Material and Grade Explanation
A4 stainless steel is a molybdenum-bearing austenitic stainless group often selected for chloride exposure, marine air, chemical environments, and outdoor equipment. A4-80 identifies a higher-strength stainless property class than A4-70, commonly associated with a minimum tensile strength level of 800 MPa under ISO 3506 reference conditions.
For buyers choosing between A2, A4-70, and A4-80, the decision should consider corrosion exposure, required clamp load, thread galling risk, mating parts, and assembly method. XZ Fastener provides additional background in its guide to stainless steel bolt grades A2-70, A4-70, and A4-80.
A4-80 stainless socket screws should not be treated as a universal replacement for alloy steel socket head cap screws. Alloy steel may offer higher strength, while A4-80 provides stainless corrosion resistance for suitable environments.
Inspection can include head dimensions, socket drive quality, thread fit, surface condition, material documents, and packing checks.
Surface Finish Selection Guide
A4-80 stainless steel socket screws are commonly supplied in plain stainless or passivated finish. Passivation helps remove free iron contamination and supports the natural stainless protective layer. For demanding appearance or corrosion environments, pickling and passivation may be discussed. Lubrication can be important for socket screws because stainless threads may gall under high tightening pressure.
| Finish | Typical Use | Buyer Note |
|---|---|---|
| Plain stainless | General machinery, indoor assemblies, standard stainless socket screw stock | Common finish when no additional surface treatment is specified. |
| Passivated | Marine air, outdoor equipment, chemical machinery, clean stainless assemblies | Often requested where corrosion resistance and clean surface are important. |
| Pickled and passivated | More demanding surface cleaning requirements | Confirm appearance expectation and acceptance criteria in advance. |
| Lubricated | Higher clamp load, repeated assembly, galling-sensitive applications | Torque behavior changes when lubrication is used. |
| Carbon steel coatings | Zinc plated DIN 933 bolts, black oxide DIN 933 bolts, hot dip galvanized DIN 933 bolts | These descriptions normally apply to carbon steel hex bolts, not standard A4 stainless socket screws. |
For broader coating and finish comparisons, review the XZ Fastener fastener finish guide.
Manufacturing and Quality Control
Factory production begins with review of the standard, diameter, length, thread pitch, material grade, property class, finish, drive dimensions, packing method, and inspection requirement. Depending on size and order details, A4-80 stainless socket screws can be produced by cold heading, thread rolling, machining, or combined processes.
Before production
XZ Fastener checks the purchase description, drawing, material requirement, head type, socket drive, thread length, finish, and inspection documents. Buyers can browse broader fastener products when the order also includes nuts, washers, threaded rods, anchors, or hex bolts.
During production
Common control points include head diameter, head height, socket depth, socket gauge fit, thread gauge fit, surface appearance, burr control, and material separation between A2 and A4 stainless grades.
Custom socket screws
For modified heads, special lengths, non-standard thread, shoulder designs, or special packing, XZ Fastener can review custom fasteners from drawings, samples, or application photos.
تطبيقات
A4-80 stainless steel socket screws are used where corrosion resistance, compact head design, internal drive assembly, and higher stainless strength are required.
- Marine equipment and coastal machinery
- Chemical processing equipment
- Stainless steel machine frames
- Pump, valve, and instrument assemblies
- Food and beverage equipment supports
- Outdoor automation and electrical enclosures
- Precision mechanical assemblies
- Maintenance replacement parts for corrosive environments
For high-vibration or safety-critical joints, the mating thread, tightening method, lubrication, and proof documentation should be reviewed before bulk production.
How to Get a Faster Quotation
A clear inquiry helps XZ Fastener quote A4-80 stainless steel socket screws accurately. Please provide:
- Size list, such as M5 x 16, M6 x 20, M8 x 30, M10 x 40.
- Standard or drawing, such as DIN 912, ISO 4762, low head, button head, countersunk head, or custom design.
- Material and grade, such as A4-80, A4-70, A2-70, or 316 stainless steel.
- Thread requirement, including coarse thread, fine pitch, full thread, or exact thread length.
- Finish requirement, such as plain, passivated, pickled and passivated, or lubricated.
- Quantity for each size and expected delivery schedule.
- Packaging requirement, including bulk carton, small box, bag, pallet, label, barcode, or private packing.
- Inspection requirements, such as material certificate, dimensional report, socket gauge check, or third-party inspection.
For a structured inquiry, use the request a quote page or contact XZ Fastener with drawings, photos, or a spreadsheet.
أسئلة متكررة
What is an A4-80 stainless steel socket screw?
It is a stainless steel socket screw made from the A4 stainless group with an 80 property class under ISO 3506 reference. Buyers usually specify it when they need A4 corrosion resistance and higher stainless strength than A4-70.
Is DIN 912 the same as ISO 4762?
DIN 912 and ISO 4762 both refer to socket head cap screw standards, but buyers should state the exact standard required because dimensional details and acceptance expectations may differ.
Can A4-80 socket screws replace alloy steel socket head cap screws?
Not automatically. Alloy steel socket screws may provide higher strength, while A4-80 stainless socket screws provide corrosion resistance. The load, environment, and assembly method should be checked before substitution.
Can XZ Fastener supply matching washers or nuts?
Yes. Stainless flat washers, spring washers, hex nuts, and assembled packing can be supplied according to the screw standard, thread, material, and order requirement.
How can buyers reduce galling risk with A4-80 stainless socket screws?
Buyers can consider lubrication, anti-seize compound, controlled tightening speed, clean mating threads, and correct mating material. The assembly method should be reviewed when high clamp load is required.
What documents can be requested with the shipment?
Material test certificates, dimensional inspection reports, socket gauge checks, thread inspection records, packing lists, and other documents can be discussed according to order requirement.
Can custom A4-80 socket screws be produced from drawings?
Custom head height, shoulder dimensions, special thread pitch, special length, marking, and packaging can be reviewed from drawings, samples, photos, quantity, and application details.
Send Your A4-80 Stainless Socket Screw Inquiry
Send your size list, finish, quantity, packaging method, and inspection requirements. Include the standard or drawing number, head type, thread pitch, thread length, destination, and whether washers or nuts are needed. XZ Fastener will review the details and prepare a quotation according to your order requirement.
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