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ASTM F880/F880M Stainless Steel Screws Specification

Austenitic Stainless Steel Socket, Square Head, and Slotted Headless Set Screws

ASTM F880/F880M Socket, Square Head, and Slotted Headless Set Screws

ASTM F880/F880M Specification covers the requirements for austenitic grade stainless steel socket-set screws (SSS) sizes #0 through 1 inch square head set screws (SHSS) sizes 0.190 inch through 1 1/2 inch and slotted headless set screws (HSS) #0 through 3/4 inch in imperial series and M1.6 to M24 in metric series with two conditions, AF and CW. The screws may be forged, formed, extruded, machined, or ground to meet the dimensional characteristics and performance requirements.

ASTM F880/F880M Chemical Composition

UNS Designation Alloy C Mn P S Si Cr Ni Cu Mo
ASTM F880/F880M Grade S30300 303 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 . . . 0.60 maxA
ASTM F880/F880M Grade S30323 303Se 0.15 2.00 0.20 0.060 1.00 17.0 to 19.0 8.0 to 10.0 . . . Se 0.15 min
ASTM F880/F880M Grade S30400 304 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00 . . .
ASTM F880/F880M Grade S30403 304L 0.030 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00 . . .
ASTM F880/F880M Grade S30500 305 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00 . . .
ASTM F880/F880M Grade S38400 384 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0 . . . . . .
ASTM F880/F880M Grade S20300 XM1 0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0 to 6.5 1.75 to 2.25 0.50 maxA
ASTM F880/F880M Grade S30430 18-9LW 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .
ASTM F880/F880M Grade S30433 302HQ 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .
ASTM F880/F880M Grade S31600 316 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.01 ... 2.0 to 3.0
ASTM F880/F880M Grade S31603 316L 0.03 2.00 0.045 0.03 1.00 16.0 to 18.0 10.0 to 14.01 ... 2.0 to 3.0
  • (A) At the manufacturer's option, determined only when intentionally added.

ASTM F880/F880M Mechanical Requirements

ASTM F880 Socket Set Screw Torsional Strength Requirements

Nominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing Test Torque, in.-lb, min
Cup and Flat Points, in. Cone and Oval Points Half Dog Points, in. AF CW
0 0.060 0.109 0.125 0.109 0.3 0.6
1 0.073 0.125 0.141 0.125 0.7 1.2
2 0.086 0.125 0.141 0.141 0.7 1.2
3 0.099 0.141 0.156 0.156 1.6 3.3
4 0.112 0.141 0.172 0.156 1.6 3.3
5 0.125 0.172 0.188 0.172 3  5 
6 0.138 0.188 0.203 0.188 3  5 
8 0.164 0.188 0.219 0.203 9  16 
10 0.190 0.188 0.250 0.234 16  26 
1/4 0.250 0.250 0.312 0.297 40  67 
5/16 0.312 0.312 0.391 0.359 79  135 
3/8 0.375 0.375 0.438 0.438 138  237 
7/16 0.437 0.438 0.547 0.484 220  378 
1/2 0.500 0.500 0.609 0.547 358  600 
5/8 0.625 0.625 0.875 0.875 ... ...
3/4 0.750 0.750 1.000 1.000 ... ...
7/8 0.875 0.875 1.000 1.000 ... ...
1 1.000 1.100 1.250 1.250 ... ...
  • (A) For socket set screw sizes over 1/2 inch, torsional strength testing is not required unless specified by purchaser. The test torque values must be supplied by purchaser and agreed upon by the supplier.

ASTM F880M Torsional Strength Requirements (Metric)

Nominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing for: Test Torque, N-m, min
Cup and Flat Points, mm Cone and Oval Points, mm Half Dog Points, mm A1-50 A1-70
1.6 3 3 3 0.03 0.05
2 4 4 4 0.06 0.1
2.5 4 4 4 0.18 0.3
3 4 5 5 0.25 0.42
4 5 6 6 0.8 1.4
5 5 8 8 1.7 2.8
6 6 8 8 3 5
8 8 10 10 7 12
10 10 12 12 14 24
12 12 16 16 25 42
16 16 20 20 63 105
20 25 25 25 126 210
24 25 30 30 200 332

ASTM F880/F880M Bolting Surface Treatment Specifications

ASTM F880/F880M Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

ASME Dimensional Standards

B18.3 Socket Cap, Shoulder and Set Screws, Inch Series
B18.6.2 Slotted Head Cap Screws, Square Head Set Screws, and Slotted Headless Set Screws (Inch Series)
ISO 4026 Hexagon socket set screws with flat point
ISO 4027 Hexagon socket set screws with cone point
ISO 4028 Hexagon socket set screws with dog point
ISO 4029 Hexagon socket set screws with cup point

ASTM F880/F880M Bolting Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

ASTM F880/F880M Testing Standards

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
E18 Test Methods for Rockwell Hardness of Metallic Materials
E92 Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials
A262 Practices for Detecting Susceptibility to Intergranular
A342/A342M Test Methods for Permeability of Weakly
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

ASME Threading Specifications

ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.3 Screw Thread Gaging System for Dimensional Acceptability - Inch Screw Threads (IN, UNR, and UNJ)
ASME B1.13M Metric Screw Threads - M Profile
ASME B1.21M Metric Screw Threads - MJ Profile
ASME B1.2 Gauges & gauging for Unified Screw Threads(Imperial)