Property Class 8.8 Steel Server Rack Screws and Cage-Nut Hardware are supplied to ISO 898-1 property class 8.8. Corrosion behaviour is requires plating (zinc) for corrosion protection, the material is magnetic, and the usable service range is commonly limited to approx. +300 °C; confirm against the coating and the load. In practice this grade is the workhorse medium-carbon alloy class for structural joints.
- Grade
- ISO 898-1 property class 8.8
- Corrosion resistance
- Requires plating (zinc) for corrosion protection
- Magnetic response
- Magnetic
- Service temperature
- commonly limited to approx. +300 °C; confirm against the coating and the load
Property values are typical for the grade. Certified mechanical test data is available on request for production orders.
Property Class 8.8 Steel (ISO 898-1 property class 8.8) is the workhorse medium-carbon alloy class for structural joints. Specified on server rack screws and cage-nut hardware it determines the corrosion behaviour (requires plating (zinc) for corrosion protection) and the service temperature range (commonly limited to approx. +300 °C; confirm against the coating and the load); the dimensions are ours rather than a standard's, and are listed in full below.
Why Choose Property Class 8.8 Steel for Server Rack Screws and Cage-Nut Hardware
The workhorse medium-carbon alloy class for structural joints. For server rack screws and cage-nut hardware, this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 8.8 |
|---|
| Magnetic response | Magnetic |
|---|
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
|---|
| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
|---|
Corrosion Behavior in Service
Carbon and alloy steel server rack screws and cage-nut hardware require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.
Galvanic & Galling Considerations
For server rack screws and cage-nut hardware in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.
Sizes of Server Rack Screws and Cage-Nut Hardware Available in Property Class 8.8 Steel
| Thread family | Representative screw lengths | Nominal diameter / pitch | Head form | Mating hardware |
|---|
| 10-32 | 3/8 / 1/2 / 5/8 in | about 3/16 in; 32 TPI | pan head | cage nut or threaded rack hole |
| 12-24 | 3/8 / 1/2 / 5/8 in | about 7/32 in; 24 TPI | pan head | cage nut or threaded rack hole |
| M6 | 10 / 16 mm | 6 mm; 1.0 pitch | pan head | cage nut or threaded rack hole |
Dimensions are independent of the material: every size above is available in Property Class 8.8 Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
Grade 8 8 Steel is one of the grades the catalog describes. Lengths and thread lengths outside the standard table are the commonest request, followed by a drive the standard does not offer and a head marked with your own part number. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom screw manufacturingSend a drawing
Applications & Industries
The sectors that buy Server Rack Screws and Cage-Nut Hardware, and the duty each one buys them for. Stocked from 10-32 to M6.
Industries that specify Server Rack Screws and Cage-Nut Hardware
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Audio racks
10-32 hardware is common where the rack is threaded for that system.
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IT equipment
M6 and 12-24 options cover different rack conventions.
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Rack service
Pan-head lengths suit front-panel and rail thickness.
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Data centers
Rack screws and cage nuts attach rails and equipment to cabinet posts.
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Automotive & transport
Chassis, driveline and body fixings that see vibration and are assembled to a controlled preload.
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Steel fabrication
Bolted connections in frames, enclosures, walkways and weldments, on the bench and on site.
Typical applications
- selecting 3/8–5/8 in or 10/16 mm length
- using a cage nut in an unthreaded square rack hole
- keeping the screw thread family consistent across the cabinet
- matching 10-32, 12-24 or M6 to the rack system
- bolting brackets, motors and gearboxes to a frame
- assemblies that are dismantled for service and re-torqued
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- Torque and preload
- The joint is designed around bolt tension, so lubrication, coating and the friction coefficient all change the torque figure — state them together.
Where to use something else
- Do not substitute 10-32, 12-24 and M6 by apparent diameter; their pitches are different and cross-threading damages the rack.
- Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.
Full application guide: where Server Rack Screws and Cage-Nut Hardware are used, how to specify them, and the cases they are wrong for
