Small Diameter Fasteners, Industrial Bolts, Metric Fasteners from EFG

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.

Small Diameter Fasteners and Industrial Bolts/Rods Metric Conversion Charts

Data for industrial bolts/rods, machine screws and small diameter fasteners from Elgin Fastener Group includes metric conversions. The chart below shows metric conversions, fastener conversion and DIN numbers for metric fasteners.

Diameter/Decimal/Metric Chart for Small Diameter Fasteners
Gauge or Diameter	Decimal (in)	mm
No. 0000	0.021	.53
No. 000	0.034	.86
No. 00	0.047	1.19
No. 0	0.060	1.524
No. 1	0.073	1.854
No. 2	0.086	2.184
No. 3	0.099	2.515
No. 4	0.112	2.845
No. 5	0.125	3.175
No. 6	0.138	3.505
No. 8	0.164	4.166
No. 10	0.190	4.826
No. 12	0.216	5.484
Fastener Conversion Chart
Inch Equivalent		Metric Size-Pitch ISO and IFI Rec.
UNC	UNF	Metric Size-Pitch ISO and IFI Rec.
1 - 64	1 - 72	M2 x 0.4
3 - 48	3 - 56	M2.5 x 0.45
4 - 40	4 - 48	M3 x .05
6 - 32	6 - 40	M3.5 x .06
8 - 32	8 - 36	M4 x .07
10 - 24	10 - 32	M5 x .08
1/4 - 20	1/4 - 28	M6 x 1
5/16 -18	5/16 - 24	M8 x 1.25
3/8 -16	3/8 - 24	M10 x 1.5
7/16 -14	7/16 - 20	M12 x 1.75
1/2 - 13	1/2 - 20	M14 x 2
5/8 - 11	5/8 - 18	M18 x 2
3/4 - 10	3/4 - 16	M20 x 2.5
1 - 8	1-12	M24 x 3
1-1/4 - 7	1-1/8 - 12	M30 x 3.5
1-1/2 - 6	1-1/4 - 12	M36 x 4
Approximate Equivalency Chart Metric/US Roughly Equivalent US Bolt Materials
Metric Nut Class	SAE J429 Normally Used	Grades	ASTM Grades
4.6	4 or 5	1	A307, Grade A
4.8	4 or 5	2	.
5.8	5	2	.
8.8	8	5	A325, A449
9.8	9	5+	A193, B7 and B16
10.9	10 or 12	8	A490, A354, Grade 8D
12.9	10 or 12	.	A540; B21 through B24
Common DIN Numbers for Metric Fasteners
DIN	Hex Capscrews
931	Coarse thread pitch partially threaded (specify grade)
933	Coarse thread pitch fully threaded (specify grade)
930	Fine thread pitch partially threaded (specify grade)
961	Fine thread pitch fully threaded (specify grade)
DIN	Nuts
934	Hex nuts (specify pitch and class)
985	Nylon insert locknuts (specify pitch and class)
980V	All metal locknuts (specify pitch and class)
DIN	Washers
125	Flatwashers
127	Lockwashers
DIN	Socket Products
912	Socket head capscrews (normally GR 12.9 and coarse thread)
7991	Flat head socket capscrews (normally GR 12.9 and coarse thread)
916	Socket setscrews (normally GR 12.9 and coarse thread)
DIN	Machine Screws
7985	Pan head Phillips drive zinc plated
965	Flat head Phillips drive zinc plated
DIN	Threaded Rod
975	All threaded rod (normally 1 meter lengths, specify grade and pitch)

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

Got a fastener problem?

EFG. The right fastener right now. ISO Registered Quality Systems

Companies of Elgin National Industries, Inc.