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#4 Flat Washers (ASME B18. 22.1)
Flat Washers, or just Plain Washers, are a flat annulus or ring, often of metal, used to spread the load from the head of a screwed fastening to the base material. Flat washers are used to increase the bearing surface of a nut or fastener's head thus spreading the clamping force over a larger area.
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| Buy Flat Washers from one of our FCH Network Members | ||||||||
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| Supplier | Loc | Type | Material | Finish | Size | Description | Qty | |
| Ababa | CA | Flat Washer | Steel | Plain | #4 | #4 lite series f/w steel yel plt (5/16 od) b18.22.1 | 200 |
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| Ababa | CA | Flat Washer | Nylon (Polyamide) | Plain | #4 x 1/4 | #4 x 1/4 f/w .032 thk nylon b18.22.1 | 2100 |
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| Ababa | CA | Flat Washer | Nylon (Polyamide) | Plain | #4 x 1/4 | #4 x 1/4 f/w .047 thk nylon b18.22.1 | 90 |
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| Ababa | CA | Flat Washer | Nylon (Polyamide) | Plain | #4 x 1/4 | #4 x 1/4 flat washer .062 thk black nylon b18.22.1 | 600 |
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| Ababa | CA | Flat Washer | Nylon (Polyamide) | Plain | #4 x 5/16 | #4 x 5/16 f/w .062 thk nylon b18.22.1 | 1040 |
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| Ababa | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x 3/8 | #4 x 3/8 f/w s/s b18.22.1 | 2600 |
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| Ababa | CA | Flat Washer | 316, 317, A4 Stainless | Plain | #4 | #4 f/w 316 s/s b18.22.1 | 3200 |
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| Ababa | CA | Flat Washer | Brass | Plain | #4 | #4 f/w brass b18.22.1 | 94 |
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| Ababa | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 f/w s/s b18.22.1 | 17570 |
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| Ababa | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 f/w lt pat s/s b18.22.1 | 354 |
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| Ababa | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #620 f/w #4 s/s (.115 x .209 x .032) b18.22.1 | 1000 |
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| Ababa | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 lght flat washer s/s b18.22.1 | 1500 |
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| Ababa | CA | Flat Washer | Nylon (Polyamide) | Plain | #4 x 1/4 | #4 x 1/4 f/w .062 thk nylon b18.22.1 | 2239 |
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| Ababa | CA | Flat Washer | Steel | Plain | #4 | #4 reg series f/w steel yel plt (5/16 od) b18.22.1 | 1200 |
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| GLF | OH | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 flat 18-8 s/s ms-803 b18.22.1 () () () | 4521 |
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| GLF | OH | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .125 | #4 flat 18-8 s/s .125x.312x.025/.040 b18.22.1 () () () | 5174 |
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| GLF | OH | Flat Washer | Steel | Plain | #4 | #4(.125x.312x.032) steel flat/ cad/yel AN960-4 b18.22.1 () () () | 2700 |
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| GLF | OH | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 | #4 (.125x.312x.032) ss flat/ 304ss MS15795-804 b18.22.1 () () () | 1380 |
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| GLF | OH | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Black Oxide | #4 | #4 (.125x.250x.022) ss flat/ black/oxi 304ss MS15795-803B b18.22.1 () () () | 4300 |
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| GLF | OH | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 | #4 (.125x.250x.022) ss flat/ 304ss MS15795-803 b18.22.1 () () () | 187 |
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| GLF | OH | Flat Washer | Steel | Cadmium/Yellow | #4 | #4 (.125x.312x.032) steel flat/ cad/ye MS27183-4 b18.22.1 () () () | 50 |
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| Irwin Ind | Ont | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | .125 x .250 x .022 thk. stainless stl flatwasher b18.22.1 | 175 |
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| Irwin Ind | Ont | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 flatwasher stainless steel b18.22.1 | 1000 |
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| Irwin Ind | Ont | Flat Washer | Brass | Plain | #4 | #4 flatwashers brass b18.22.1 | 3800 |
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| Irwin Ind | Ont | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 flatwashers s/s [.312 o.d.] b18.22.1 | 3429 |
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| Irwin Ind | Ont | Flat Washer | Brass | Nickel | #4 | #4 flatwashers brass & nickel plated b18.22.1 | 25000 |
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| Irwin Ind | Ont | Flat Washer | Steel | Zinc/Clear | #4 | #4 narrow type-b flat washer steel zinc b18.22.1 | 4700 |
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| Ababa | CA | Flat Washer | Nylon (Polyamide) | Plain | #4 x 1/4 | #4 x 1/4 f/w .032 thk nylon b18.22.1 | 400 |
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| Ababa | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 f/w s/s b18.22.1 | 1400 |
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| Exim | S'pore | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Black Oxide | #4 | washer flat s/s black oxide #4 nas620c42.921 x 5.309 x 0.406 mm0.115 x 0.209 x 0.016 in b18.22.1 | 46 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | 620c4 #4 f/w 18-8 ss 620C4 b18.22.1 | 1099 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | 960c4 #4 f/w 18-8 ss 1-W-4 b18.22.1 | 7573 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 x .250 x .022 | #4x.250x.022 flat stainless steel 18-8 passivated MS15795-803 b18.22.1 | 500 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .312 | flat #4 18-8 304 steel .312x.032dfar certs required AN960C4 b18.22.1 | 4928 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 standard f/w 18-8 1-W-4 b18.22.1 | 3402 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 | ms15795-804 #4 f/w .125 x.312 x .032 sst 304ss MS15795-804 b18.22.1 | 2335 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x 5/16 x 0.016 | whr flat 7/16 ss rohs compliant per an960l 304ss 1-W-716L b18.22.1 | 270 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .209 x .032 | #4x.209x.032 flat stainless steel 18-8 1-NAS-4 b18.22.1 | 2200 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Black Oxide | #4 x .209 x .016 | #4x.209x.016 flat stainless steel 18-8 black oxide and wax JET 4SPLFW SSBO b18.22.1 | 1644 |
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| QFC | TX | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4-40 | 4-40 retainer 18-8 304 steel b18.22.1 | 1000 |
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| QFC | TX | Flat Washer | Steel | Zinc/Clear | #4 | #4 type-b narrow flat triv zinc b18.22.1 | 7500 |
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| QFC | TX | Flat Washer | Steel | Zinc/Clear | #4 | #4 type-b narrow flat triv zinc b18.22.1 | 908 |
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| QFC | TX | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 type-b narrow flat 18-8 s/s b18.22.1 | 240 |
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| QFC | TX | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 type-b narrow flat 18-8 s/s b18.22.1 | 12860 |
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| QFC | TX | Flat Washer | Steel | Zinc/Clear | #4 | #4 type-b regular flat tri-zinc b18.22.1 | 1000 |
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| QFC | TX | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 type-b regular flat 18-8 b18.22.1 | 1000 |
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| QFC | TX | Flat Washer | Steel | Zinc/Yellow | #4 | #4 type-b wide flat zinc/yellow b18.22.1 | 390 |
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| QFC | TX | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 | .125x.312x.025-.040 flat 18-8 (#4) 304ss MS15795-804 b18.22.1 | 2000 |
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| B & K FAST | PA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | #4 flat washers stainless 18-8 b18.22.1 | 903801 |
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| Marine Fasteners | FL | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 | #4 flat .250 od .017/.028 thick 18-8ss 304ss MS15795-803 b18.22.1 | 331458 |
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| Marine Fasteners | FL | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .125 | #4 flat .125 idx.312 odx.032 thk 18-8 ss 100 per small bag 5 small bags per master pack-generic brand b18.22.1 | 65000 |
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| General F | MI | Flat Washer | Steel | Zinc/Clear | #4 | #4 b(w) f/w zinc b18.22.1 | 2000 |
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| QFC | TX | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x 3/8 | #4 x 3/8 od washer 18-8 ss b18.22.1 | 4380 |
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| QFC | TX | Flat Washer | Steel | Zinc/Clear | #4 | #4 type-b narrow flatwasher trivalent b18.22.1 | 4444 |
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| JET FITTING | CA | Flat Washer | Fiber | Plain | #4 x .228 x .032 | #4x.228x.032 flat washer fibre b18.22.1 | 11670 |
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| JET FITTING | CA | Flat Washer | Steel | Fluoropolymer-Based (Xylan, Fluorokote, Teflon) | #4 x .312 x .030 | #4x.312x.030 flat washer teflon b18.22.1 | 3355 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Passivated | #4 x .187 x .016 | #4x.187x.016 flat washer stainless steel 18-8 passivated mfg seastrom b18.22.1 | 8000 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x 5/16 x 0.016 | whr flat 1/4 ss .500x.032 rohs compliant per an960l b18.22.1 | 5000 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .312 x .032 | washer flat #4x.312x.032 stainless steel b18.22.1 | 4153 |
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| JET FITTING | CA | Flat Washer | Steel | Zinc/Clear | #4 x .280 x .025 | #4x.280x.025 flat washer steel zinc b18.22.1 | 17175 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .209 x .032 | #4x.209x.032 flat washer stainless steel 18-8 b18.22.1 | 4300 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .209 x .032 | #4x.209x.032 flat washer stainless steel 18-8 b18.22.1 | 4200 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 x .209 x .016 | #4x.209x.016 flat washer stainless steel 18-8 b18.22.1 | 2000 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Black Oxide | #4 x .209 x .016 | #4x.209x.016 flat washer stainless steel 18-8 black oxide and wax b18.22.1 | 1550 |
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| JET FITTING | CA | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | washer flat #4 x.250x.022 stainless steel 18-8 b18.22.1 | 4500 |
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| THRDFAST | FL | Flat Washer | 316, 317, A4 Stainless | Plain | #4 | t-316 ss f/w b18.22.1 | 150 |
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| THRDFAST | FL | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | ms15795-803 18-8 s 304ss b18.22.1 | 3,496 |
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| THRDFAST | FL | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | ms15795-804 18-8 s 304ss b18.22.1 | 171 |
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| THRDFAST | FL | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | 18-8 ss f/w b18.22.1 | 744 |
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| THRDFAST | MS | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | 18-8 ss f/w b18.22.1 | 200 |
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| THRDFAST | OK | Flat Washer | 300 Stainless (A1,A2, 18-8,304,310 etc.) | Plain | #4 | 18-8 ss f/w b18.22.1 | 100 |
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