ISO 898-1: Bolts, screws and studs - Andrews Fasteners Ltd
Andrews Fasteners Limited
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ISO 898-1: Carbon Steel and Alloy Steel – Bolts, screws and studs

Chemical composition as per ISO 898-1 for typical grades

CLASS MATERIAL AND TREATMENT C
MIN
C
MAX
P
MAX
S
MAX
B
MAX
TEMPERING TEMP. [C]
8.8 CARBON STEEL WITH ADDITIVES (E.G. B, MN OR CR) QUENCHED AND TEMPERED 0.15 (D) 0.40 0.025 0.025 0.003 425
CARBON STEEL QUENCHED AND TEMPERED 0.25 0.55 0.035 0.025
10.9 CARBON STEEL WITH ADDITIVES (E.G. B, MN OR CR) QUENCHED AND TEMPERED 0.15 (D) 0.35 0.025 0.025 0.003 340
CARBON STEEL QUENCHED AND TEMPERED 0.25 0.55 0.025 0.025 0.003 425
CARBON STEEL WITH ADDITIVES (E.G. B, MN OR CR) QUENCHED AND TEMPERED 0.20 (D) 0.55 0.025 0.025
ALLOY STEEL QUENCHED AND TEMPERED (G) 0.20 0.55 0.025 0.025
12.9 ALLOY STEEL QUENCHED AND TEMPERED (G) 0.28 0.50 0.025 0.025 0.003 380
(D) IN CASE OF PLAIN CARBON BORON STEEL WITH A CARBON CONTENT BELOW 0.25% (LADLE ANALYSIS), MIN MANGANESE 0.6% FOR 8.8 AND 0.7% FOR 10.9
(G) ALLOY STEEL SHALL CONTAIN ONE OF THE FOLLOWING ELEMENTS: CHROMIUM 0.30%, NICKEL 0.30%, MOLYBDENUM 0.20%, VANADIUM 0.10%

Mechanical and physical properties as per ISO 898-1 for typical grades

MECHANICAL OR PHYSICAL PROPERTY CLASS 8.8
(M16 AND BELOW)
CLASS 8.8
(ABOVE M16)
CLASS 10.9 CLASS 12.9
TENSILE STRENGTH [MPA] NOM. 800 1000 1200
MIN. 800 830 1040 1220
STRESS AT 0.2% NON-PROPORTIONAL ELONGATION (YIELD) [MPA] NOM. 640 900 1080
MIN. 640 660 940 1100
STRESS UNDER PROOF LOAD [MPA] NOM. 580 600 830 970
ELONGATION AFTER FRACTURE FOR MACHINED TEST PIECE [%] MIN. 12 12 10 8
REDUCTION OF AREA AFTER FRACTURE FOR MACHINED TEST PIECE [%] MIN. 52 48 44
IMPACT STRENGTH, CHARPY V-NOTCH [J] MIN. 27 27 27 (UNDER INVESTIGATION)

Bolts, Screws and Studs (Carbon And Alloy Steel)

Hardness requirement as per ISO 898-1 for typical grades

HARDNESS SCALE CLASS 8.8
M16 AND BELOW
CLASS 8.8
ABOVE M16
CLASS 10.9 CLASS 12.9
VICKERS, HV MIN. 250 255 320 385
MAX. 320 335 380 435
BRINELL, HB MIN. 238 242 304 366
MAX. 304 318 361 414
ROCKWELL, HRC MIN. 22 23 32 39
MAX. 32 34 39 44

ISO 898-1: Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread

Please refer also to: Suitability test requirements (BS EN 15048) – CE Marking

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