Stainless Steel Industrial Fasteners, Industrial Machine Screws, Industrial Bolts Hardness Conversions

EFI provides extensive fastener engineering, offshore purchasing and quality capabilities. EFI is staffed by sales engineers and import professionals with considerable background in industrial fasteners.

Leading manufacturer of cold headed fasteners, tight tolerances and multiple secondary operations for precision components used in heavy-duty diesel engines, transmissions and other demanding fastener applications.

Domestic quality manufacturing of small diameter fasteners and machine screws (diameters from 4-40 to 1/2" and lengths to 5"). Includes Lo-Driv® and Grip-Lite™ screws and other standard, semi-standard and specialty fastener solutions.

Manufacturer of small diameter, long length fasteners. Specializing in long length, small diameter headed and threaded fasteners through 52" long and 1/2" diameter. Superior straightness in plated parts.

Leader of cold-formed fasteners (diameters from 1/4" to 5/8" and lengths to 3") and industry standard and semi-standard fasteners. Efficient manufacturing processes for medium to high-volumes and provides in-house tooling.

Specializes in electro deposited zinc and zinc phosphate coatings for fastener manufacturing, stamping, fabrication and metal forming industries.

Hardness Conversions for Industrial Fasteners

Data for stainless steel industrial bolts, industrial machine screws and specialty and standard industrial fasteners from Elgin Fastener Group includes hardness conversions. The chart below shows a conversion between Brinell and Rockwell hardness numbers, as well as tensile strength.

Brinell Indentation Diameter mm	Brinell Hardness Number		Rockwell Hardness Number		Rockwell Superficial Hardness Number Superficial Diamond Penetrator			Tensile Strength (approx.) 1000 psi
Brinell Indentation Diameter mm	Standard Ball	Tungsten- Carbide Ball	B Scale	C Scale	15N Scale	30N Scale	45N Scale	Tensile Strength (approx.) 1000 psi
2.45		627	58.70	89.60	76.30	65.10		347
2.50		601		57.30	89.00	75.10	63.50	328
2.55		578		56.00	88.40	73.90	62.10	313
2.60		555		54.70	87.80	72.70	60.60	298
2.65		534		53.50	87.20	71.60	59.20	288
2.70		514		52.10	86.50	70.30	57.60	274
2.75		495		51.00	85.90	69.40	56.10	264
2.80		477		49.60	85.30	68.20	54.50	252
2.85		461		48.50	84.70	67.20	53.20	242
2.90		444		47.10	84.00	65.80	51.50	230
2.95	429	429		45.70	83.40	64.60	49.90	219
3.00	415	415		44.50	82.80	63.50	48.40	212
3.05	401	401		43.10	82.00	62.30	46.90	202
3.10	388	388		41.80	81.40	61.10	45.30	193
3.15	375	375		40.40	80.60	59.90	43.60	184
3.20	363	363		39.10	80.00	58.70	42.00	177
3.25	352	352		37.90	79.30	57.60	40.50	170
3.30	341	341		36.60	78.60	56.40	39.10	163
3.35	331	331		35.50	78.00	55.40	37.80	158
3.40	321	321		34.30	77.30	54.30	36.40	152
3.45	311	311		33.10	76.70	53.30	34.40	147
3.50	302	302		32.10	76.10	52.20	33.80	143
3.55	293	293		30.90	75.50	51.20	32.40	139
3.60	285	285		29.90	75.00	50.30	31.20	136
3.65	277	277		28.80	74.40	49.30	29.90	131
3.70	269	269		27.60	73.70	48.30	28.50	128
3.75	262	262		26.60	73.10	47.30	27.30	125
3.80	255	255		25.40	72.50	46.20	26.00	121
3.85	248	248		24.20	71.70	45.10	24.50	118
3.90	241	241	100.00	22.80	70.90	43.90	22.80	114
3.95	235	235	99.00	21.70	70.00	42.90	21.50	111
4.00	229	229	98.20	20.50	69.70	41.90	20.10	109
4.05	223	223	97.30					104
4.10	217	217	63.40					103
4.15	212	212	95.50					100
4.20	207	207	94.60					99
4.25	201	201	93.80					97
4.30	197	197	92.80					94
4.35	192	192	91.90					92
4.40	187	187	90.70					90
4.45	183	183	90.00					89
4.50	179	179	89.00					88
4.55	174	174	87.80					86
4.60	170	170	86.80					84
4.65	167	167	86.00					83
4.70	163	163	85.00					82
4.80	156	156	82.90					80
4.90	149	149	80.80					73
5.00	143	143	78.70					71
5.10	137	137	76.40					67
5.20	131	131	74.00					65
5.30	126	126	72.00					63
5.40	121	121	69.00					60
5.50	116	116	67.60					58
5.60	111	111	65.70					56

Torque Tensioning
Screw Point Types
Pilot Hole Sizes
Bolt & Screw Head Types
Weights per Thousand
Unified External Screw Threads
Rod & Bolt Diameters
Metric Conversions
Hole Sizes for Die Casting
Material Strength
Drive Tool Sizes
Hardness Conversions

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Companies of Elgin National Industries, Inc.