Assignment

Sample Results

Image Description Grade Minimum Tensile Strength based on Head Markings
(ksi) Avg. Rockwell Hardness
(Number
of Tests) Estimated Tensile Strength based on Rockwell Hardness
(ksi) Avg. Brinell Hardness
(Number
of Tests) Estimated Tensile Strength based on Brinell Hardness
(ksi) Maximum Load
(lb) Tensile Strength based on Tensile Test
(ksi)

Silver with "307A OF" markings ASTM A307 60 B94.3 (6) 84 192 (4) 91 unknown^# unknown

Gray with no markings SAE Grade 2 74 B94.3 (7) 98 241 (4) 116 unknown unknown

Gold with 3 marks SAE Grade 5 120 B101.5 (7) 118 272 (3) 132 unknown unknown

Hexagonal socket head with no markings SAE Grade 8 150 B105 (4) 132 369 (2) 181 unknown unknown

Note for all specimens:
    Nominal major diameter = 0.75 in.
    A_s = 0.334 in.²
    N = 10 threads/in.

Tests performed by Jeff Thomas on April 12, 2000.
# Unknown because test fixture broke on first specimen.

Rockwell Images

Brinell Images

Image	Description	Grade	Minimum Tensile Strength based on Head Markings (ksi)	Avg. Rockwell Hardness (Number of Tests)	Estimated Tensile Strength based on Rockwell Hardness (ksi)	Avg. Brinell Hardness (Number of Tests)	Estimated Tensile Strength based on Brinell Hardness (ksi)	Maximum Load (lb)	Tensile Strength based on Tensile Test (ksi)
	Silver with "307A OF" markings	ASTM A307	60	B94.3 (6)	84	192 (4)	91	unknown^#	unknown
	Gray with no markings	SAE Grade 2	74	B94.3 (7)	98	241 (4)	116	unknown	unknown
	Gold with 3 marks	SAE Grade 5	120	B101.5 (7)	118	272 (3)	132	unknown	unknown
	Hexagonal socket head with no markings	SAE Grade 8	150	B105 (4)	132	369 (2)	181	unknown	unknown
Note for all specimens: Nominal major diameter = 0.75 in. A_s = 0.334 in.² N = 10 threads/in.					Tests performed by Jeff Thomas on April 12, 2000. # Unknown because test fixture broke on first specimen.