Stainless Steel Fasteners

Fasteners made of stainless steel have become increasingly popular due to their inherent corrosion resistive properties. Their anti corrosive properties are directly attributed to the higher levels of Nickel and Chromium in the metal.

AISI Grades 202, 304 and 316 are the more commonly used material grades.

Stainless steel of grade 202 contains nickel of 5% and chromium of 18% and is the cheapest of the three grades. Fasteners of this grade are generally used for low budget uses and/or where the mating components are also not of a higher grade.

Stainless steel of grade 304 contains nickel of 8% and chromium of 18% and is the most commonly used grade for the production of fasteners. It possesses an excellent combination of strength, corrosion resistance and fabricability. Fasteners of this grade are being extensively used today in almost every industry.

Grade 316 contains Nickel of 10% and chromium of 16% added with 2% molybdenum which gives the metal very high anti corrosive properties. Fasteners of this grade are used mostly in the chemical and marine industry.

All kinds of fasteners are available in the above grades. The different types and their size range are summarized below.

Fastener	Standards	Grades Available	Size Range (Metric threads)		Size Range (BSW threads)
Fastener	Standards	Grades Available	From	To	From	To
Hexagonal Bolts (Fully threaded screws)	IS 1363/DIN 933/BS 1083	202, 304 & 316	M3 x 10 (in 304) M6 x 10 (in 202 & 316)	M24 x 300	3/16” x 1/2”	3/4” x 8”
Hexagonal Full and Lock Nuts	IS 1363/ DIN 934/439/ BS 1083	202, 304 & 316	M2	M36	1/8”	1”
Plain Washers	IS 2016	202, 304 & 316	M3	M36	1/8”	1”
Spring Washers (Square and Flat sections)	IS 3063	202, 304 & 316	M3	M36	1/8”	1”
Slotted Machine Screws (with CSk, Cheese, Round and Raised CSK heads)	IS 1365/1366/8911 DIN 963/84 BS 450	202 & 304	M2 x 4	M12 x 100	1/8” x 1/4”	1/2” x 4”
Cross Recessed Machine Screws with Pan and CSK Phillips heads (PPH & CPH)	DIN 7965/965	304	M2 x 4	M6 x 50	-	-
Allen Cap Screws	IS 2269/DIN 912 BS 2470	202, 304 & 316	M3 x 6	M20 X 100	3/16” x 1/2”	5/8” X 4”
Allen CSK Screws	IS 6761/ DIN 7991 BS 2470	202 & 304	M3 x 8	M12 x 100	3/16” X 1/2”	1/2” X 4”
Grub Screws	IS 6094/ DIN 916/ BS 2470	304	M3 x 3	M12 x 50	3/16” x 3/16”	1/2” X 2”
Button Head Screws	ISO 7380	304	M3 x 8	M10 X 60	-	-
Slotted Self Tapping Screws (with PAN & CSK heads)	IS 7173/7170 DIN 7971/7972	202 & 304	No. 4 x 6.5	No. 14 x 50	-	-
Cross Recessed Self Tapping screws (with Pan & CSK Phillips heads)	DIN 7981/7982	202 & 304	No. 4 x 6.5	No. 14 x 50	-	-
Wood Screws	IS 6760/DIN 97	202 & 304	No. 6 x 20	No. 12 x 100	-	-
Self Locking Nuts (Nylock Nuts)	IS 7002/DIN 982	304 & 316	M3	M20	3/16”	1”
Square Nuts	IS 2585/DIN 557	304	M5	M12	-	-
Wing Nuts	IS 2636/ DIN 315	202 & 304	M3	M12	-	-
Dom Nuts	DIN 1587	304 & 316	M3	M24	3/16”	1”
Flange Nut and Weld Nuts	DIN 6923/6927/929	304	M6	M12	-	-
Special Hex Nuts	UNI 5587	304	M6 X 6	M12 X 12	-	-
Heavy Hex Nuts	ANSI B18.2.2	304 & 316			3/8”	1”
Star Washers (Multigrip overlapping)	-	304	M6	M10	-	-
Star Washers (ET & IT)	-	304	M3	M16	-	-
Taper Washers	-	304	M6	M16	-	-
Threaded Rod	-	304 & 316	M5	M36	3/16”	1”
Rivets (Round, Flat and CSK heads)	IS 2609	202, 304 & 316	3mm x 10mm		-	-
POP (BLIND) RIVETS and Nuts		304
Anchor fasteners (Pin Type)	-	202 & 304	M6 x 50	M24 x 200	-	-

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