Marine Fasteners

Chemical Requirement (%)

Element	%
Carbon	0.37–0.49
Manganese	0.65–1.10
Phosphorus, max	0.035
Sulfur, max	0.040
Silicon	0.15–0.35
Chromium	0.75–1.20
Molybdenum	0.15–0.25

Nuts & Washers

Nuts (B7)

ASME A194/194M GR 2H

Nuts (B7M)

ASME A194/194M GR 2HM

Flat Washers

DIN 125

Heat Treatment

Quench & Temper (Liquid Medium)

Mechanical Requirements

Dia (in.)	Temp. Temp. (°C) min	Tensile Str. min (MPa)	Yield Str. min (MPa)	Elong. 4D min (%)	Red. of Area min (%)	Hardness max
GRADE B7
2½ and under	594	861	723	16	50	35 HRC
Over 2½ to 4	594	792	655	16	50	35 HRC
Over 4 to 7	594	689	517	18	50	35 HRC
GRADE B7M
4 and under	620	689	551	18	50	99 HRB
Over 4 to 7	620	689	517	18	50	99 HRB

Notes

Typical steel compositions: 4140, 4142, 4145, 4140H, 4142H, 4145H.
Max hardness: 235 HB or 99 HRB. Min hardness: 200 HB or 93 HRB (per clause 10.2.2).
B7M min carbon may be 0.28% if tensile properties are met; AISI 4130/4130H allowed.
Threads, manufacturing process and certification conform to ASME SA 193/193M.

Surface Finish Options

Self Finish (Default)Hot Dip Galvanizing (HDG)Zinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

Chemical Requirement (%)

Element	%
Carbon	0.38–0.48
Manganese	0.75–1.00
Phosphorus, max	0.035
Sulfur, max	0.040
Silicon	0.15–0.35
Chromium	0.80–1.10
Molybdenum	0.15–0.25

Impact Requirement (J)

Specimen Size (mm)	Avg of 3 (J) min	One Specimen min (J)
10 × 10	27	20
10 × 7.5	22	16

Mechanical Requirements

Grade	Dia (in.)	Temp. Temp. (°C) min	Tensile Str. min (MPa)	Yield Str. min (MPa)	Elong. 4D min (%)	Red. of Area min (%)	Hardness max
L7	2½ and under	593	860	725	16	50	—
L7M	2½ and under	620	690	550	18	50	235 HB or 99 HRB

Nuts & Washers

Nuts

ASTM A194/194M Gr. 4, 7

Flat Washers

DIN 125

Heat Treatment

Quenched & Tempered

L7M Carbon min

0.28% (AISI 4130/4130H OK)

Surface Finish Options

Self Finish (Default)Hot Dip Galvanizing (HDG)Zinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

Chemical Requirement (%)

Element	%
Carbon	0.36–0.47
Manganese	0.45–0.70
Phosphorus, max	0.035
Sulfur, max	0.040
Silicon	0.15–0.35
Chromium	0.80–1.15
Molybdenum	0.50–0.65
Vanadium	0.25–0.35
Aluminum, max	0.015

Mechanical Requirements

Dia (in.)	Temp. (°C) min	Tensile min (MPa)	Yield min (MPa)	Elong. (%)	Red. Area (%)	Hardness max
M64 and under	650	860	725	18	50	35 HRC
Over M64 to M100	650	760	655	17	45	35 HRC
Over M100 to M180	650	690	585	16	45	35 HRC

Surface Finish Options

Self Finish (Default)Hot Dip Galvanizing (HDG)Zinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

ASME SA 193/193M — Austenitic Stainless Steel

B8, B8A, B8C, B8CA, B8M, B8MA, B8T, B8TA

Bolting material for high temperature or high pressure service and special purpose applications.

Products: Heavy Hex Bolts / Machine Bolts / Jack Bolts / U-Bolts / Stud Bolts / Anchor Bolts

B8 Family

Chemical Requirement (%)

Grade	Material	C max	Mn max	P max	S max	Si max	Cr	Ni	Mo	Ti / Co+Ta
B8, B8A	TYPE 304	0.08	2.00	0.045	0.030	1.00	18.0–20.0	8.0–11.0	—	—
B8C, B8CA	TYPE 347	0.08	2.00	0.045	0.030	1.00	17.0–19.0	9.0–12.0	—	10XC=1.10 max
B8M, B8MA	TYPE 316	0.08	2.00	0.045	0.030	1.00	16.0–18.0	10.0–14.0	2.0–3.0	—
B8T, B8TA	TYPE 321	0.08	2.00	0.045	0.030	1.00	17.0–19.0	9.0–12.0	—	5×(C+N)=0.70 max

Mechanical Requirements

Class	Grade / Dia	Heat Treatment	Tensile min (ksi)	Yield min (ksi)	Elong. 4D min (%)	Red. Area min (%)	Hardness max
1	B8, B8M — all dia	Carbide Solution Treated	75	30	30	50	223 HB or 96 HRC
1	B8C, B8T — all dia	Carbide Solution Treated	75	30	30	50	223 HB or 96 HRC
1A	B8A, B8CA, B8MA, B8TA — all dia	Carbide Sol. Treated (finished)	75	30	30	50	192 HB or 90 HRB
CLASS 2 — B8, B8C, B8T (Carbide Solution Treated & Strain Hardened)
2	¾" and under	Carbide Sol. Treated & Strain Hardened	125	100	12	35	321 HB or 35 HRC
2	Over ¾" to 1"		115	80	15	35	321 HB or 35 HRC
2	Over 1" to 1¼"		105	65	20	35	321 HB or 35 HRC
2	Over 1¼" to 1½"		100	50	28	45	321 HB or 35 HRC
CLASS 2 — B8M (Carbide Solution Treated & Strain Hardened)
2	¾" and under	Carbide Sol. Treated & Strain Hardened	110	95	15	45	321 HB or 35 HRC
2	Over ¾" to 1"		100	80	20	45	321 HB or 35 HRC
2	Over 1" to 1¼"		95	65	25	45	321 HB or 35 HRC
2	Over 1¼" to 1½"		90	50	30	45	321 HB or 35 HRC

Nuts & Washers

Nuts

ASTM A194/194M (SS Heavy Hex)

Flat Washers

DIN 125 (same material as bolts & nuts)

Standard

ASME SA 193/193M

Chemical Requirement — Carbon & Alloy Steel (%)

Grade	Material	C	Mn	P	S	Si	Cr	Mo
2H & 2HM	Carbon	0.40 min	1.00	0.040	0.050	0.040	—	—
4	Carbon-Molybdenum	0.40–0.50	0.70–0.90	0.035	0.040	0.15–0.35	—	0.20–0.30
7 & 7M	4140/4142/4145/4140H/…	0.37–0.49	0.65–1.10	0.035	0.04	0.15–0.35	0.75–1.20	0.15–0.25

Chemical Requirement — Austenitic Stainless Steel (%)

Grade	Material	C	Mn	P	S	Si	Cr	Ni	Mo	Ti / Co+Ta
8, 8A	TYPE 304	0.08	2.00	0.045	0.030	1.00	18.0–20.0	8.0–11.0	—	—
8C, 8CA	TYPE 347	0.08	2.00	0.045	0.030	1.00	17.0–19.0	9.0–12.0	—	10Xc, min
8M, 8MA	TYPE 316	0.08	2.00	0.045	0.030	1.00	16.0–18.0	10.0–14.0	2.0–3.0	—
8T, 8TA	TYPE 321	0.08	2.00	0.045	0.030	1.00	17.0–19.0	9.0–12.0	—	5×(C+N)=0.70 max

Mechanical Requirements

Grade	Dia (in.)	Temp. Temp (°C) min	Hardness max	Hardness after HT min	ID Symbol
2H	To 1½" or M36 incl.	540	24–35 HRC	89 HRB	2H
2H	Over 1½" or M36	540	38 HRC	79 HRB	2H
2HM, 7M	—	540–590	84–99 HRB	84 HRB	2HM, 7M
4, 7	—	590	24–35 HRC	94 HRB	4/4L, 7/7L
8, 8C, 8M & 8T	—	—	32 HRC	—	8, 8C, 8M & 8T
8A, 8CA, 8MA, 8TA	—	—	60–90 HRB	—	8A, 8CA, 8MA, 8TA

Surface Finish Options

Self Finish (Default)Hot Dip Galvanizing (HDG)Zinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

Chemical Requirement (%)

Grade	Material	C max	Mn max	P max	S max	Si max	Cr	Ni	Al max	Mo	Ti	V	B
660	S66286	0.08	2.00	0.040	0.030	1.00	13.5–16.0	24.0–27.0	0.35	1.00–1.50	1.90–2.35	0.10–0.50	0.001–0.010

Mechanical Requirements

Class	Grade, Dia	Heat Treatment	Tensile min ksi (MPa)	Yield min ksi (MPa)	Elong. 4D min (%)	Red. Area min (%)	Hardness HBW (HRC)
A	660, all dia	Solution treated & age hardened	130 (895)	85 (585)	15	18	348–341 (24–37)
B	660, all dia	Solution treated & age hardened	130 (895)	85 (585)	15	18	348–341 (24–37)
C	660, all dia	Solution treated & age hardened	130 (895)	85 (585)	15	18	348–341 (24–37)
D	660, all dia	Solution treated & age hardened	130 (895)	105 (725)	15	18	348–321 (24–35)

Stress Rupture — Class A, B, C

Grade, Class	Test Temp °F (°C)	Stress min ksi (MPa)	Time to Rupture min (h)	Elongation min (%)
660 A, B, C	1200 (650)	56 (385)	100	5

Class D does not require a stress rupture test.

Nuts & Washers

Nuts

GR. 660 (specified Class)

Flat Washers

DIN 125 — same type GR. 660

Chemical Requirement (%)

Element	%
Carbon	0.030 max
Manganese	2.00 max
Phosphorous	0.030 max
Sulfur	0.020 max
Silicon	1.00 max
Chromium	21.00–23.00
Nickel	4.5–6.5
Molybdenum	2.5–3.5
Nitrogen	0.08–0.20

Mechanical Requirements & Info

Tensile min (MPa)	Yield min (MPa)	Elong. 4D (%)	Red. Area min (%)
620	450	25	45

Heat Treatment

Solution treated min 1020°C, quench below min 260°C

Nuts

UNS S31803

Flat Washers

UNS S31803

Chemical Requirement (%)

Element	%
Carbon	0.30–0.52
Manganese, min	0.60
Phosphorus, max	0.040
Sulfur, max	0.050
Silicon	0.15–0.35

Nuts, Washers & Notes

Nuts

ASTM A563 Gr. A/B/DH

Flat Washers

ASTM F436

Dimensions

ASME B18.2.1

Threads

Class 2A, ASME B1.1 Unified Coarse

Mechanical Requirements

Diameter	Tensile min (ksi)	Yield min (ksi)	Elong. 4D min (%)	Red. Area min (%)	Hardness max
¼" to 1" incl.	120	92	14	35	25–34 HRC
Over 1" to 1½" incl.	105	81	14	35	19–30 HRC
Over 1½" to 3"	90	58	14	35	—

Surface Finish Options

Self Finish (Default)HDGZinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

Chemical Requirement (%)

Material Type	C	P	S	B	Temp. Temp. min
Carbon steel with additives (B, Mn or Cr)	0.20–0.55*	0.025	0.025	0.003 max	Min 425°C
Carbon Steel	0.25–0.55	0.025	0.025	—
Alloy Steel	0.20–0.55	0.025	0.025	—

* Plain carbon steel <0.25% C: min Mn = 0.7%

Mechanical Requirements

Dia	Tensile min (MPa)	Yield min (MPa)	Elong. min (%)	Red. Area min (%)	Hardness HRC
All	1040	940	9	48	32–39

Nuts

ISO 898-2, Class 10 or higher

Flat Washers

DIN 125

Surface Finish Options

Self Finish (Default)HDGZinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

Chemical Requirement — 316-A4 per ISO 3506-1 (%)

Element	%
Carbon	0.08 max
Manganese	2.00 max
Phosphorous	0.045 max
Sulfur	0.030 max
Silicon	1.00 max
Chromium	16.00–18.50
Nickel	10.00–15.00
Molybdenum	2.00–3.00
Copper	0.04 max
Nitrogen	0.22 max

Mechanical Requirements — ISO 3506-1

Grade	Tensile min (MPa)	Yield min (MPa)	Elong. 4D min (%)
A4-80	800	600	0.3d

Nuts

A4-80 (316)

Flat Washers

316/A4

Chemical Requirement (%)

Material Type	C	P	S	B	Temp. Temp. min
Carbon steel with additives (B, Mn or Cr)	0.15–0.40*	0.025	0.025	0.003 max	Min 425°C
Carbon Steel	0.25–0.55	0.025	0.025	—
Alloy Steel	0.20–0.55	0.025	0.025	—

* Plain carbon steel <0.25% C: min Mn = 0.6%

Mechanical Requirements

Dia	Tensile min (MPa)	Yield min (MPa)	Elong. min (%)	Red. Area min (%)	Hardness HRC
d ≤ 16 mm	800	640	12	52	22–32
d > 16 mm	830	660	12	52	23–34

Nuts

ISO 898-2, Class 8 or higher

Flat Washers

DIN 125

Surface Finish Options

Self Finish (Default)HDGZinc / Electro GalvanizationYellow PassivationPTFE Xylan/Xylar

Chemical Requirement — 316-A4 per ISO 3506-1 (%)

Element	%
Carbon	0.08 max
Manganese	2.00 max
Phosphorous	0.045 max
Sulfur	0.030 max
Silicon	1.00 max
Chromium	16.00–18.50
Nickel	10.00–15.00
Molybdenum	2.00–3.00
Copper	0.04 max
Nitrogen	0.22 max

Mechanical Requirements — ISO 3506-1

Grade	Tensile min (MPa)	Yield min (MPa)	Elong. 4D min (%)
A4-70	700	450	0.4d

Nuts

A4 (316)

Flat Washers

DIN 125 – 316/A4

Chemical Requirement (%)

Element	%
Carbon	0.30–0.52
Manganese, min	0.60
Phosphorus, max	0.035
Sulfur, max	0.040
Silicon	0.15–0.35

Nuts, Washers & Notes

Nuts

ASTM A563 Gr 10S

Flat Washers

ASTM F436M

Bolt Dimensions

ANSI/ASME B18.2.3.7M

Threads

Class 6g, ANSI B1.13M Coarse

Default Surface Finish

HDG

Mechanical Requirements

Diameter	Tensile min (MPa)	Yield min (MPa)	Elong. 2D min (%)	Red. Area min (%)	Proof Load Stress min (MPa)	Hardness max
M12 to M36	830	660	12	35	600	25–34 HRC

Chemical Requirement (%)

Element	%
Carbon	0.30–0.48 / 0.35–0.53 (M36)
Manganese, max	1.65
Phosphorus, max	0.040
Sulfur, max	0.040
Silicon, max	0.60

Mechanical Requirements

Diameter	Tensile min (MPa)	Yield min (MPa)	Elong. 2D min (%)	Red. Area min (%)	Hardness max
Up to M36	1040–1210	940	14	40	33–39 HRC

Nuts

ASTM A563 Gr 10S

Flat Washers

ASTM F436M

Bolt Dimensions

ANSI/ASME B18.2.3.7M

Threads

Class 6g, ANSI B1.13M Coarse

Surface Finish Options

Self Finish (Default)HDGZinc / Electro GalvanizationYellow PassivationPTFE Xylan/XylarZn/Al Inorganic / Dacromet

Chemical Requirement (%)

Form	Diameter	C max	Mn	P max	S max	Si max
PLATES
Plates	Up to M20	0.25	NA	0.04	0.05	0.40
Plates	M20 to M40	0.25	0.80–1.20	0.04	0.05	0.40
Plates	M40 to M65	0.26	0.80–1.20	0.04	0.05	0.15–0.40
Plates	M65 to M100	0.27	0.85–1.20	0.04	0.05	0.15–0.40
Plates	Above M100	0.29	0.85–1.20	0.04	0.05	0.15–0.40
BARS
Bars	Up to M20	0.26	NA	0.04	0.05	0.40
Bars	M20 to M40	0.27	0.60–0.90	0.04	0.05	0.40
Bars	M40 to M100	0.28	0.60–0.90	0.04	0.05	0.40
Bars	Above M100	0.29	0.60–0.90	0.04	0.05	0.40

Mechanical Requirements

Property	Value
Tensile Strength	400–550 MPa
Yield Strength	250 MPa
Elongation in 8"	20%
Elongation in 2"	23%

Nuts & Washers

Nuts

ASTM A563 Gr.10S or ISO 898/-2 DIN 934 Cl 8

Flat Washers

DIN 125

HDG per

ASTM A153 Cl C (53+ microns min avg)

Copper (if specified)

Min 0.20%

Grade Descriptions

Grade	Description	Color Mark
Grade 36	Low carbon, 36 ksi yield steel anchor bolts	Blue
Grade 55	High strength, low alloy, 55 ksi yield steel anchor bolts	Yellow
Grade 105	Alloy, heat treated, high strength 105 ksi yield steel anchor bolts	Red

Chemical Requirement (%)

Element	Grade 36	Grade 55 & 105
Carbon	0.28	0.28
Manganese	0.60–0.90	0.60–0.90
Phosphorus, max	0.04	0.04
Sulfur, max	0.05	0.05
Copper, min (when specified)	0.20	0.20

Nuts & Washers

Nuts

ASTM A563

Flat Washers

DIN 125 (Rec. ASTM F436M)

Supplemental S4: impact testing at +40°F — Grades 55 & 105
Supplemental S5: impact testing at –20°F — Grade 105 only

Mechanical Requirements

Grade	Dia (mm)	Tensile min (MPa)	Yield min (MPa)	Elong. 4D min (%)	Red. Area min (%)
36	M6–M100	400–552	248	23	40
55	M6–M48 / M56–M64 / M70–M76 / M82–M102	517–655	379	21	30 / 22 / 20 / 18
105	M6–M76	836–1035	724	15	45

Surface Finish Options

Self Finish (Default)HDGZinc / Electro Galvanization

Manufacturing / Stock